What is the [H3O*] in a solution with [OH-] = 5 x 10-12 M?
O 5 x 10-12 M
0 7x 102 M
O 3 x 10-7 M
O 5 x 10-8 M
O 2x 10-3 M

Answers

Answer 1

The concentration of the ion that has been shown here is[tex]2 x 10^-3[/tex]M. OptionD

What is the oxinium ion concentration?

We must bear in mind that in the case that we have we have to deal with the process that we have to use to obtain the oxonium ion concentration when we do have that hydroxide ion concentration and this an important part of the pH calculation process.

We have that;

[H3O^+]  = 1 * 10^-14/ 5 x 10^-12 [tex][H3O^+] = 1 * 10^-14/ 5 x 10^-12[/tex]

Thus we have that the concentration of the ion can now be ween to be

[tex]2 * 10^-3[/tex] M as shown

Learn more about concentration:https://brainly.com/question/13872928

#SPJ1


Related Questions

Chemistry dilutions with stoichiometry. Please help if you know how to do these types of problems

Answers

1. The Molar mass of Al(SO₄)₃ is 342.15 g/mol

2. The molarity of aluminum ions in the new solution will be 0.478 M.

How to calculate the value

1. Aluminum (Al): 26.98 g/mol (2 atoms)

Sulfur (S): 32.07 g/mol

Oxygen (O): 16.00 g/mol (12 atoms)

Molar mass of Al(SO₄)₃ = (2 × 26.98 g/mol) + 32.07 g/mol + (12 × 16.00 g/mol)

= 342.15 g/mol

2. Total moles of Al₃+ ions in the new solution = 0.0436 mol + 0.0877 mol = 0.1313 mol

Volume of the new solution = 225 mL + 325 mL = 550 mL = 0.55 L

Molarity of Al₃+ ions in the new solution = 0.1313 mol / 0.55 L

= 0.478 M

Learn more about molar mass on

https://brainly.com/question/837939

#SPJ1

how many moles of cacl2 are in 250 ml of a 9.0m of cacl2 solution

Answers

The number of moles of calcium chloride in 250 ml of a 9.0M of solution is 2.25 moles.

How to calculate no. of moles?

The amount of moles in a substance can be calculated by multiplying the molarity of the solution by the volume as follows;

no of moles = molarity × volume

According to this question, 250mL of a calcium chloride solution has a molarity of 9M. The number of moles can be calculated as follows:

no of moles = 9.0M × 0.250L

no of moles = 2.25 moles

Learn more about moles at: https://brainly.com/question/15209553

#SPJ1

Question 7 of 10
Which observation is the best sign that a chemical change is happening?
OA. A change from a solid to a gas
B. A change from one shape to another
O C. A release of light and heat
OD. A constant temperature and mass
SURA

Answers

Answer:

A

Explanation:

potential signs of a chemical reaction is change is color, change in temp and color

What is the molarity of a solution which contains 58.5 g of NaCl dissolved in 0.25 L of solution

Answers

The molarity of the solution, which contains 58.5 g of NaCl dissolved in 0.25 L of solution, is approximately 4.004 M.

To calculate the molarity of a solution, we need to determine the number of moles of solute (NaCl) and then divide it by the volume of the solution in liters.

Given:

Mass of NaCl = 58.5 g

Volume of solution = 0.25 L

Step 1: Calculate the number of moles of NaCl.

To find the number of moles, we need to divide the mass of NaCl by its molar mass. The molar mass of NaCl is the sum of the atomic masses of sodium (Na) and chlorine (Cl).

Molar mass of NaCl = 22.99 g/mol (Na) + 35.45 g/mol (Cl) = 58.44 g/mol

Moles of NaCl = Mass of NaCl / Molar mass of NaCl

= 58.5 g / 58.44 g/mol

≈ 1.001 mol

Step 2: Calculate the molarity.

Molarity (M) is defined as moles of solute per liter of solution.

Molarity = Moles of solute / Volume of solution

= 1.001 mol / 0.25 L

≈ 4.004 M

Therefore, the molarity of the solution, which contains 58.5 g of NaCl dissolved in 0.25 L of solution, is approximately 4.004 M.

For more such question on molarity visit:

https://brainly.com/question/30404105

#SPJ8

limiting reactant and percentage yield lab report

Answers

In a chemical reaction, the limiting reactant is a reactant that is used up first, limiting the amount of product that can be formed. The percentage yield is the ratio of the actual yield to the theoretical yield, multiplied by 100. It is used to determine the efficiency of a chemical reaction.

Here's how to write a lab report on limiting reactant and percentage yield:

Title: Limiting Reactant and Percentage Yield Lab ReportIntroduction: The purpose of this lab was to determine thet limiting reactant and percentage yield of a chemical reaction between [insert reactants]. Theoretical calculations were used to predict the amount of product that should be formed, and the actual yield was compared to the theoretical yield to calculate the percentage yield.Materials: [List all materials used in the experiment]Procedure: [Include a step-by-step procedure of the experiment, including any measurements or observations made]Results: [Include a table of all measurements and observations made during the experiment. Calculate the moles of each reactant and product, and determine the limiting reactant and theoretical yield]Discussion: [Discuss the results of the experiment, including any sources of error and how they may have affected the results. Compare the actual yield to the theoretical yield to calculate the percentage yield, and explain the significance of the percentage yield]Conclusion: [Summarize the key findings of the experiment and their significance. Make recommendations for future research or improvements to the experiment]References: [Include any sources used in the lab report, including the textbook or lab manual]

For more such questions on Percentage yield

https://brainly.com/question/14714924

#SPJ8

What are all the possible metabolites for the clofibrate structure through metabolism pathways like hydrolysis, alkylation, conjugation, oxidation etc. ?

Answers

Clofibrate is a lipid-lowering pharmaceutical that has been utilized to treat hyperlipidemia. Its metabolism system includes different pathways such as hydrolysis, oxidation, conjugation, and others.

What  are a few potential metabolites of clofibrate?

Metabolites are little molecules that are produced during the process of  metabolism in living living beings.

Clofibrate hydrolysis metabolite:

2-(4-Chlorophenoxy)-2-methylpropanoic acid (phenoxyisobutyric acid)

Clofibrate oxidation metabolites:

4-Chlorophenylacetic acid4-Chlorobenzaldehyde4-Chlorophenylacetyl-CoA

Clofibrate alkylation metabolites:

No specific alkylation metabolites have been widely reported for clofibrate.

Clofibrate conjugation metabolites:

Glucuronide conjugatesSulfate conjugates

Conclusively, the relative abundance and significance of each metabolite can vary among individuals.

Learn more about metabolites

https://brainly.com/question/14422941

#SPJ1

Actually it’s a physiological question
An equilibrium condition exists when:
A. a system is in a homeostatic state
B. a system is in a steady-state
C. a system has opposing forces that counteract one another
D. a system that involves feedback
E. all of the above

Answers

Answer:

E. all of the above

Explanation:

Equilibrium is a balanced and stable state in a system. It can be achieved through homeostasis, steady-state, opposing forces, and feedback.

The outer ______ are the parts of an atom that are involved in chemical reactions. A. electrons and protons B. electrons C. protons and neutrons D. protons

Answers

The outer ______ are the parts of an atom that are involved in chemical reactions. A. electrons and protons B. electrons C. protons and neutrons D. protons

The answer is B Electrons

For which of the following does Bolivia have the absolute advantage in production?

Answers

Bolivia has an absolute advantage in the production of natural gas, tin, and silver.

In economics, the absolute advantage is the ability of a country, individual, company, or region to produce a product or service at a lower cost per unit than others. In order to determine the absolute advantage, one must take into account the factors of production like natural resources, labor, technology, and capital.Bolivia, a landlocked country in South America, has an absolute advantage in the production of natural gas, tin, and silver. The country has an abundance of natural resources like minerals, oil, and gas which have contributed significantly to its economy. It is estimated that Bolivia has around 10.7 trillion cubic feet of natural gas reserves and is the second-largest producer of natural gas in South America after Venezuela.In addition to natural gas, Bolivia has a rich history of mining and is one of the largest producers of tin and silver in the world. Bolivia produces around 20,000 tons of tin annually and is responsible for approximately 10% of global silver production. Therefore, Bolivia has an absolute advantage in the production of natural gas, tin, and silver.

For such more questions on Bolivia

https://brainly.com/question/10027473

#SPJ8

Which type of engineer design mostly building?
A) civil engineer
B) chemical engineer
C) aerospace engineer
D) mechanical engineer

Answers

The type of engineer that mostly designs buildings is option A. civil engineer.

Civil engineers specialize in the design, construction, and maintenance of infrastructure projects, including buildings, bridges, roads, dams, and other large-scale structures. They are responsible for ensuring the structural integrity, safety, and functionality of these projects. When it comes to buildings specifically, civil engineers play a crucial role in their design and construction.

They collaborate with architects and other professionals to develop plans and blueprints that meet the client's requirements while considering factors such as load-bearing capacity, structural stability, building codes, and environmental considerations.

Civil engineers analyze the site conditions, conduct feasibility studies, and determine the appropriate materials, foundations, and structural systems for the building. They take into account factors like earthquake resistance, wind loads, and environmental sustainability.

Civil engineers also oversee the construction process, ensuring that the building is being constructed according to the design specifications and meeting safety standards. Therefore, the correct answer is option A.

know more about civil engineer here:

https://brainly.com/question/29117530

#SPJ8

For the following reactions, determine the equilibrium constant equation.
You must show your workings within your submission.
1. CO2(g) + H2(g) ⇌ CO(g) + H2O(g)
2. 2NO(g) + 2H2(g) ⇌ N2(g) + 2H2O(g)
3. Cu(s) + 2Ag+(g) ⇌ Cu2+(g) + 2Ag(s)
4. H2(g) + I2(g) ⇌ 2HI(g)

can anyone help and explain the steps please, this one's really baffling me!

Thankyou in advance!! ​

Answers

The equilibrium constant equation for the given reactions are:

[CO][H₂O] / [CO₂][H₂][N₂][H₂O]² / [NO]²[H₂]²[Cu²⁺] / [Ag⁺]²[HI]² / [H₂][I₂]

How do i determine the equilibrium constant equation?

The equilibrium constant for a given reaction is defined by the following formula

Equilibrium constant = [Product]ᵃ / [Reactant]ᵇ

The above formula is only valid for gaseous and aqueous reactants and products

Where

a and b are coefficients of products and reactants respectively

Now, we can obtain the equilibrium constant equation for the reactions. Details below:

1. CO₂(g) + H₂(g) ⇌ CO(g) + H₂O(g)

Equilibrium constant equation = [CO][H₂O] / [CO₂][H₂]

2. 2NO(g) + 2H₂(g) ⇌ N₂(g) + 2H₂O(g)

Equilibrium constant equation = [N₂][H₂O]² / [NO]²[H₂]²

3. Cu(s) + 2Ag⁺(g) ⇌ Cu²⁺(g) + 2Ag(s)

Equilibrium constant equation = [Cu²⁺] / [Ag⁺]²

4. H₂(g) + I₂(g) ⇌ 2HI(g)

Equilibrium constant equation = [HI]² / [H₂][I₂]

Learn more about equilibrium constant:

https://brainly.com/question/16589765

#SPJ1

help me out
For each set of atoms, identify the isotopes.
Select the isotopes.

Answers

Isotopes are atoms of the same element that have different numbers of neutrons, identified by their atomic mass number.

Isotopes are atoms of a particular element that have the same number of protons but differ in the number of neutrons they have.

This results in differences in their atomic mass, but they share similar chemical properties.

Identifying isotopes can be accomplished through their atomic mass number, which is the sum of their protons and neutrons.

The notation for an isotope is written as element name-mass number.

For example, the isotopes of hydrogen are hydrogen-1, hydrogen-2, and hydrogen-3.

Here are examples of how to identify isotopes for different sets of atoms:

1. Carbon isotopes:The three carbon isotopes are carbon-12, carbon-13, and carbon-14. Carbon-12 is the most abundant and has six protons and six neutrons.

Carbon-13 has seven neutrons, and carbon-14 has eight neutrons.

2. Nitrogen isotopes: Nitrogen has two stable isotopes, nitrogen-14 and nitrogen-15. Nitrogen-14 has seven neutrons and nitrogen-15 has eight neutrons.

3. Oxygen isotopes: Oxygen has three isotopes, oxygen-16, oxygen-17, and oxygen-18. Oxygen-16 has eight neutrons, oxygen-17 has nine neutrons, and oxygen-18 has ten neutrons.

4. Chlorine isotopes: Chlorine has two isotopes, chlorine-35 and chlorine-37. Chlorine-35 has 18 neutrons, and chlorine-37 has 20 neutrons.

5. Uranium isotopes: Uranium has three isotopes, uranium-234, uranium-235, and uranium-238. Uranium-234 has 142 neutrons, uranium-235 has 143 neutrons, and uranium-238 has 146 neutrons.

In conclusion, isotopes are variations of an element that have the same number of protons but different numbers of neutrons. They can be identified through their atomic mass number, and different elements can have varying numbers of isotopes.

For more such questions on Isotopes

https://brainly.com/question/14220416

#SPJ8

A steadily flowing steam of water is funneled into a graduated cylinder for exactly 30s, during which time 50mL is collected. What is the volumetric flow rate of the stream? The mass flow rate?

Answers

Given that a steadily flowing stream of water is funneled into a graduated cylinder for exactly 30 s, during which time 50 mL is collected. We are to determine the volumetric flow rate of the stream and the mass flow rate.

The volumetric flow rate can be calculated by the following formula;Volumetric flow rate = Volume collected / Time taken= 50mL/ 30 s= 5/3 mL/s. Now to determine the mass flow rate of the stream, we need to consider the density of the fluid. For simplicity, we take the density of water to be 1 g/mL.

Therefore, Mass of fluid collected = volume collected × density of fluid ;  Mass of fluid collected = 50mL × 1 g/mL = 50g. Now, Mass flow rate = Mass of fluid collected / Time taken  Mass flow rate = 50 g / 30 s= 5/3 g/s. Thus, the volumetric flow rate of the stream is 5/3 mL/s and the mass flow rate of the stream is 5/3 g/s.

For more such questions on  volumetric flow rate

https://brainly.com/question/13254954

#SPJ8

1.7g of nitrogen gas is given. Calculate the moles, and volume in dm³ at r.t.p. ( Ar N=14)​

Answers

The number of moels of the nitrogen gas is 0.061 moles, the volume of the gas is 1.4 L

What is the molar volume of a gas?

The molar volume of a gas refers to the volume occupied by one mole of the gas at a specific temperature and pressure. It is often denoted as Vₘ and is typically expressed in units of liters per mole (L/mol).

We have that;

Number of moles of the nitrogen = 1.7g /28 g/mol

= 0.061 moles

We have that;

1 mole of a gas occupies 22.4 L

0.061 moles of the gas would occupy 0.061 * 22.4/1

= 1.4 L

Learn more about molar volume:https://brainly.com/question/29884686

#SPJ1

11.2L of O2 at STP has the same mass as
1) 11.2L of Methane at STP
2) 22.4L of Methane at STP
3) 33.6L of Methane at STP
4) 44.8L of Methane at STP
hiah ie twice as dense as oxygen under the same conditions is​

Answers

11.2 L of O₂ at STP has the same mass as 22.4 L of methane, CH₄ at STP (2nd option)

How do i determine the mass that has the same mass 11.2 L of O₂ at STP?

First, we shall obtain the mass of 11.2 L of O₂ at STP. Details below:

Volume of O₂ (v) = 11.2 LVolume at STP (V) = 22.4 LMole of O₂ = v / V = 11.2 / 22.4 = 0.5 moleMolar mass of O₂ = 32 g/molMass of O₂ =?

Mass of O₂ = Mole × molar mass

= 0.5 × 32

= 16 grams

Now, we shall obtain the mass of each sample of methane. Details below:

For 11.2 L of Methane, CH₄:

Volume of CH₄ (v) = 11.2 LVolume at STP (V) = 22.4 LMole of CH₄ = v / V = 11.2 / 22.4 = 0.5 moleMolar mass of CH₄ = 16 g/molMass of CH₄ =?

Mass of CH₄ = Mole × molar mass

= 0.5 × 16

= 8 grams

For 22.4 L of Methane, CH₄:

Volume of CH₄ (v) = 22.4 LVolume at STP (V) = 22.4 LMole of CH₄ = v / V = 22.4 / 22.4 = 1 moleMolar mass of CH₄ = 16 g/molMass of CH₄ =?

Mass of CH₄ = Mole × molar mass

= 1 × 16

= 16 grams

For 33.6 L of Methane, CH₄:

Volume of CH₄ (v) = 33.6 LVolume at STP (V) = 22.4 LMole of CH₄ = v / V = 33.6 / 22.4 = 1.5 molesMolar mass of CH₄ = 16 g/molMass of CH₄ =?

Mass of CH₄ = Mole × molar mass

= 1.5 × 16

= 24 grams

For 44.8 L of Methane, CH₄:

Volume of CH₄ (v) = 44.8 LVolume at STP (V) = 22.4 LMole of CH₄ = v / V = 44.8 / 22.4 = 2 molesMolar mass of CH₄ = 16 g/molMass of CH₄ =?

Mass of CH₄ = Mole × molar mass

= 2 × 16

= 32 grams

Thus, from the above calculation, we can conclude that 11.2 L of O₂ at STP has the same mass as 22.4 L of Methane, CH₄ (2nd option)

Learn more about mass:

https://brainly.com/question/21940152

#SPJ1

What are three statements that relate to genetically modified foods?

1They helps produce new varieties of crops.
2They increase greenhouse gases.
3They can help reduce pesticide use.
4There is concern that the method will lead to a loss of genetic diversity.
5This method requires more land for growing crops than other methods.

Answers

Three statements that relate to genetically modified foods are  1. They help produce new varieties of crops 3.They can help reduce pesticide use.4. There is concern that the method will lead to a loss of genetic diversity.

Genetically modified (GM) foods are created by altering the genetic material of plants or animals. The modification involves the insertion of a DNA sequence from another species to produce new varieties of crops. The following are three statements that relate to genetically modified foods:

1. They help produce new varieties of crops.GM crops can be designed to be more resistant to pests, drought, and disease. They can also produce more significant yields and better quality products, which can help feed a growing population.

3. They can help reduce pesticide use.GM crops can be modified to be more resistant to pests, which can reduce the need for pesticides. This can lead to a reduction in the amount of chemicals used, which is better for the environment and for the people who consume these foods.

4. There is concern that the method will lead to a loss of genetic diversity.GM crops can be bred to be more uniform and more resistant to pests and diseases. This can result in a loss of genetic diversity in the crop, which could make it more susceptible to diseases and pests in the future.

Know more about   genetically modified foods  here:

https://brainly.com/question/31202514

#SPJ8

Read the chemical equation.

2C2H2 + 5O2 → 4CO2 + 2H2O

Which of the following statements would be correct if one mole of C2H2 was used in this reaction?

Answers

The statements would be correct if one mole of C2H2 was used in this reaction is two moles of carbon dioxide were produced from this reaction .

The balanced chemical equation is:

2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

The coefficients in a balanced equation represent the molar ratios between the reactants and products. In this case, 2 moles of C₂H₂(acetylene) are reacting with 5 moles of O₂ (oxygen) to produce 4 moles of CO₂ (carbon dioxide) and 2 moles of H₂O(water).

If we consider one mole of C₂H₂  being used in the reaction, we can determine the corresponding quantities of the other substances involved:

From the equation, 2 moles of C₂H₂  will react with 5 moles of O2. Since we're using only one mole of C₂H₂ , we need to determine the proportional amount ofO₂ involved. This can be calculated using the stoichiometric ratio: (1 mole C₂H₂ ) * (5 moles O₂ / 2 moles C₂H₂ ) = 2.5 moles O₂

Therefore, the correct statement is that two moles of carbon dioxide (CO₂) were produced from this reaction. This is because two moles of C₂H₂  react to form four moles of CO₂, as indicated by the balanced equation. The other substances involved, one mole of oxygen (O₂) and two moles of water (H₂  O), are not directly relevant to the number of moles of C₂H₂  used in the reaction.

In summary, when one mole of C₂H₂  is used in the given reaction, it will react with 2.5 moles of O₂, resulting in the production of two moles of carbon dioxide (CO₂).

Know more about   carbon dioxide  here:

https://brainly.com/question/30355437

#SPJ8

The Question was Incomplete, Find the full content below :

Read the chemical equation. 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O Which of the following statements would be correct if one mole of C₂H₂ was used in this reaction?

One mole of oxygen was used in this reaction.

Five moles of oxygen were used in this reaction.

Four moles of carbon dioxide were produced from this reaction.

Two moles of carbon dioxide were produced from this reaction.

what does the first ionization energy represent?
A. the energy required to add an electron
B. the energy to remove an energy level of electrons
C. the energy required to remove an electron from an atom
D. the energy given off when an electron is gained

Answers

The first ionization energy represents Option C.  the energy required to remove an electron from an atom.

The ionization energy is defined as the energy required to remove an electron from a gaseous atom or ion to form a cation that carries a charge of +1.Ionization energy is an essential property of an element, and it is determined by the effective nuclear charge (Zeff) and the distance between the valence electrons and the nucleus. The effective nuclear charge is the positive charge that an electron experiences from the nucleus.

The closer the valence electrons are to the nucleus, the greater the effective nuclear charge, making it more challenging to remove an electron from the atom. The ionization energy increases from left to right and from bottom to top across the periodic table. The ionization energy decreases from top to bottom and from right to left across the periodic table. The reason for this trend is the increase in atomic radius and the decrease in effective nuclear charge from top to bottom and from right to left on the periodic table.

Ionization energy plays a significant role in chemical reactions, particularly in redox reactions. The energy required to remove an electron from an atom or ion is equivalent to the energy released when the ion or atom gains an electron. A high ionization energy indicates that the atom is less reactive and more stable since it requires a lot of energy to remove an electron. Therefore the correct option is C

Know more about ionization energy  here:

https://brainly.com/question/20658080

#SPJ8

Chemistry dilutions with stoichiometry. Please help if you know how to do these types of problems

Answers

Answer:1

Explanation:

Part A Data
Trial 1. Trial 2
Mass of calorimeter 1.3470g. 1.3210g
Mass of calorimeter and water 2.7691g. 2.4351g
Initial temperature of water
inside calorimeter 22.4c. 22.6c
Mass of copper 1.5990g. 1.6193g
Temperature of boiling water bath
after 10 minutes 100.1c. 99.9c
Highest temperature of water with
copper inside calorimeter
29.6 c. 29.8c

Part A Calculations. Show your work.
1. What was the mass of water inside the calorimeter for trial 1? For trial 2?

2. What was the temperature change of the copper for trial 1? For trial 2?

3. What was the temperature change of the water inside the calorimeter for trial 1? trial 2

4. Determine the specific heat capacity of copper for trial 1 and then for trial 2.

5. For trials 1and2 what was your average specific heat capacity of copper?

Answers

Answer:

1. To find the mass of water inside the calorimeter, subtract the mass of the calorimeter from the mass of the calorimeter and water.

Trial 1: 2.7691g - 1.3470g = 1.4221g

Trial 2: 2.4351g - 1.3210g = 1.1141g

2. To find the temperature change of the copper, subtract the initial temperature from the highest temperature reached.

Trial 1: 29.6°C - 22.4°C = 7.2°C

Trial 2: 29.8°C - 22.6°C = 7.2°C

3. To find the temperature change of the water inside the calorimeter, subtract the initial temperature from the highest temperature reached.

Trial 1: 29.6°C - 22.4°C = 7.2°C

Trial 2: 29.8°C - 22.6°C = 7.2°C

4. To find the specific heat capacity of copper, use the formula q = mcΔT, where q is the heat absorbed by the copper, m is the mass of the copper, c is the specific heat capacity of copper, and ΔT is the temperature change of the copper.

Trial 1: q = mcΔT = (1.5990g)(0.385J/g°C)(7.2°C) = 4.32J

c = q/mΔT = 4.32J/(1.5990g)(7.2°C) = 0.356J/g°C

Trial 2: q = mcΔT = (1.6193g)(0.385J/g°C)(7.2°C) = 4.37J

c = q/mΔT = 4.37J/(1.6193g)(7.2°C) = 0.361J/g°C

5. To find the average specific heat capacity of copper, add the specific heat capacity of copper for trial 1 to the specific heat capacity of copper for trial 2 and divide by 2.

Average: (0.356J/g°C + 0.361J/g°C)/2 = 0.358J/g°C

right the structure of the ester group​

Answers

The ester structural formula is, R-CO-OR, where, R, is an alkyl group, the, C=O, is the carbonyl group, and, -OR, is the alkoxy group.

A collection of coins contains 15 nickels, 5 quarters, and 7 dimes. What is the percentage of dimes in the collection? Express your answer to two significant figures and include the appropriate units. ​

Answers

Once upon a time, in a land far, far away, there was a collection of coins that contained 15 nickels, 5 quarters, and 7 dimes. The dimes, being the smallest of the coins, often felt overshadowed by the larger nickels and quarters. But one day, they decided to find out just how important they were in the collection.

So, they did some math and found out that there were a total of 15 + 5 + 7 = 27 coins in the collection. And since there were 7 dimes, the percentage of dimes in the collection was (7/27) * 100% = 25.93%.

The dimes were overjoyed to find out that they made up over a quarter of the collection! From then on, they held their heads high and jingled with pride. And they all lived happily ever after.

The end.

6. What value was there in predicting the properties for gaps in Mendeleev's table? It created spaces for missing elements. It helped in the discovery of new elements. It helped in finding uses for the elements.​

Answers

The prediction led to the discovery of several elements that filled the predicted gaps, such as gallium and germanium. Mendeleev's table provided a framework for organizing elements based on their properties, allowing scientists to make educated guesses about the existence and properties of unknown elements.

It created spaces for missing elements as well, thus allowing for the classification of elements in a systematic manner.The discovery of new elements and the prediction of their properties were two of the most significant consequences of predicting the properties of gaps in Mendeleev's table. These predictions led to the discovery of new elements, such as gallium and germanium, which Mendeleev had predicted would exist based on the properties of adjacent elements in the periodic table.He also predicted the properties of other unknown elements that were later discovered. In addition, it aided in the identification of new uses for existing elements, which helped to advance science and industry.

For such more questions on Mendeleev's table

https://brainly.com/question/14127336

#SPJ8

The pH of a 0.025 M KHA and 0.025 M K2A buffer used for the calibration of pH-meter is 10.00.
Examine whether the pH calculated using activities agrees with the experimental value. Prove your answer with
calculations (A is carbonate ion).

Answers

Here are the steps to solve this problem:

We are given two buffer solutions: 0.025 M KHCO3 and 0.025 M K2CO3. The pH of this buffer mixture is measured experimentally to be 10.00.

We want to calculate the pH theoretically based on the activities of the species in the buffer, and see if it agrees with the experimental value of 10.00.

First, we calculate the activity coefficients of the ions using the Debye-Hückel equation. For 0.025 M solutions at room temperature:

γ(KHCO3) = 0.902

γ(K2CO3) = 0.835

Next, we calculate the activities of the ions:

a(KHCO3) = 0.025 M × 0.902 = 0.0225 M

a(K2CO3) = 0.025 M × 0.835 = 0.0209 M

a(H+) = √(0.0225 × 0.0209) = 0.0106 M

a(HCO3-) = 0.0225 M + 2×0.0209 M = 0.0643 M

Using the Henderson-Hasselbalch equation, we calculate the theoretical pH:

pH = pKa + log (a(HCO3-)/ a(H+))

= 6.37 + log(0.0643/0.0106)

= 9.94

Comparing this to the experimental pH of 10.00, we see the calculated pH based on activity is slightly lower than the measured value. This minor discrepancy can be attributed to limitations in the activity coefficient model.

In summary, while the calculated pH based on ion activities in the buffer agrees reasonably well with the experimental pH of 10.00, there is a small difference of 0.06 pH units. This indicates that for highly concentrated solutions like this buffer, using concentrations directly (as in the experimental measurement) is slightly more accurate than using activities.

Consider the following reaction: 2N2O5(g) → 4NO2(g) + O2(g) Calculate the volume N2O5 that must decompose completely to produce 9.64 L nitrogen dioxide.​

Answers

The volume of [tex]N_2O_5[/tex] needed to produce 9.64 L of [tex]NO_2[/tex] is 4.97 L, calculated using stoichiometry and the ideal gas equation.

The given chemical equation is [tex]2N_2O_5(g) \rightarrow 4NO_2(g) + O_2(g)[/tex] .The volume of [tex]N_2O_5[/tex] that decomposes completely to form 9.64 L of [tex]NO_2[/tex] is to be calculated. For this, we can use the concept of stoichiometry. Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in a balanced chemical equation.To calculate the volume of [tex]N_2O_5[/tex] that is needed to produce 9.64 L of [tex]NO_2[/tex], we will first determine the number of moles of NO2 produced in the reaction. For this, we can use the ideal gas equation, PV = nRT. Here, we have the volume of NO2 and we can assume the pressure and temperature to be constant. Thus, we have PV = nRT, where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T = temperature. Substituting the given values in the ideal gas equation, we get,n = PV/RT = (1 atm × 9.64 L)/(0.0821 L atm K-1 mol-1 × 300 K) = 0.404 molFrom the chemical equation, we see that 2 moles of [tex]N_2O_5[/tex] give 4 moles of [tex]NO_2[/tex]. Thus, 0.404 mol of [tex]NO_2[/tex] must have been produced from (0.404/2) = 0.202 mol of [tex]N_2O_5[/tex]. Using the ideal gas equation, we can also find the volume of 0.202 mol of [tex]N_2O_5[/tex] at the given conditions. Thus, V = nRT/P = (0.202 mol × 0.0821 L atm K-1 mol-1 × 300 K)/1 atm = 4.97 L. Thus, the volume of [tex]N_2O_5[/tex] that must decompose completely to produce 9.64 L nitrogen dioxide is 4.97 L.

For more questions on stoichiometry

https://brainly.com/question/14935523

#SPJ8

A proton in a linear accelerator has a de Broglie wavelength of 159 pm . Part A What is the speed of the proton? Express your answer with the appropriate units.

Answers

The speed of the proton is 2.50 x 10⁵ m/s.

Given that a proton in a linear accelerator has a de Broglie wavelength of 159 pm.

The de Broglie wavelength equation is given byλ = h/pwhereλ is the wavelengthh is the Planck's constantp is the momentum of the protonRearranging the above equation to solve for the momentum of the proton,

we havep = h/λSubstituting the value of the wavelength given in the question into the above equation we get:

p = 6.626 x 10⁻³⁴ Js/ (159 x 10⁻¹² m)p = 4.17 x 10⁻²² kgm/s.

The speed of the proton can be calculated using the relation between momentum and speed. The momentum of a proton can be expressed asp = mv .

where p is momentumm is the mass of the protonv is the velocity of the proton.

Rearranging the above equation, we have v = p/m .

Substituting the values of momentum and mass of the proton,

we havev = 4.17 x 10⁻²² kgm/s / 1.67 x 10⁻²⁷ kgv = 2.50 x 10⁵ m/s.

For more such questions on velocity

https://brainly.com/question/1856219

#SPJ8

K(+1)Cl(+5)O3(-2) → K(+1)Cl(-1) + O2(0) oxidation

Answers

The balanced chemical equation for the given redox reaction is 2KClO3 → 2KCl + 3O2

The given equation represents a redox reaction, where the oxidation state of the reactants changes.

Potassium chlorate (KClO3) gets reduced to potassium chloride (KCl) and oxygen gas (O2).

Potassium chlorate: K(+1)Cl(+5)O3(-2) --> K(+1)Cl(-1) + O2(0)The oxidation state of the potassium ion (K+) is the same before and after the reaction.

Therefore, it is not oxidized or reduced and considered to be a spectator ion. The oxidation state of the chlorine ion (Cl-) decreases from +5 to -1 during the reaction.

Thus, chlorine gets reduced. The oxidation state of oxygen (O) increases from -2 to 0 in the reaction, indicating that oxygen gets oxidized.

Here, potassium chlorate is the oxidizing agent, and chlorine is the reducing agent.

The electrons lost by chlorine in its oxidation are gained by oxygen in its reduction.

Thus, the electrons are conserved.The balanced chemical equation for the given redox reaction is 2KClO3 → 2KCl + 3O2.

This reaction can also be described as an exothermic decomposition reaction, which requires heat to initiate.

The reaction between potassium chlorate and sulfuric acid is often used in laboratories to generate oxygen gas by decomposition of potassium chlorate.I hope this helps you.

For more such questions on oxidation

https://brainly.com/question/25551544

#SPJ8

Which of the following most likely happens when the number of particles of a gas decreases? (5 points) Group of answer choices The pressure of the gas increases. The pressure of the gas remains same. The number of collisions of gas particles decreases. The number of collisions of gas particles remains same.

Answers

Answer:

The number of collisions of gas particles decreases.

Explanation:

This is because the number of collisions between gas particles and the walls of the container is directly proportional to the number of particles. When there are fewer particles, there are fewer collisions with the container walls, resulting in less force applied per unit area, and therefore, a decrease in pressure.

You have a material that is 2500. ppm in water and you want to dilute it in the following sequence in a 3 tube Series dilution. Tube 1 is 15 mL and a 1/25 dilution; Tube 2 is 10 mL and and a 1/5 dilution; tube 3 is 5 mL and a 1/20 dilution. How much of what goes in each tube. What is the concentration of all the tubes?

Answers

0.25 ml of the solution from tube 2 and 4.75 ml of distilled water are taken in tube 3. Concentration of tube 1 = 1.67 ppmConcentration of tube 2 = 5.005 ppm Concentration of tube 3 = 1.25125 ppm

Given data: The concentration of material is 2500 ppm in water. Tube 1: 15 mL and a 1/25 dilution.

Tube 2: 10 mL and a 1/5 dilution. Tube 3: 5 mL and a 1/20 dilution.

To calculate the amount of material in each tube, we will use the following formula:Amount of Material in Diluted Solution (C1V1) = Amount of Material in Concentrated Solution (C2V2)Let's solve for each tube.

Tube 1: V1 = 15 mL, D = 1/25, C2 = 2500 ppm.

Amount of Material in Diluted Solution (C1 × 15) = Amount of Material in Concentrated Solution (2500 ppm × 1)C1 = (2500 ppm × 1) / 15 mL × 1/25 = 1.67 ppm.

Amount of material to be taken in tube 1 = 15 ml × 1/25 = 0.6 ml.

Therefore, 0.6 ml of concentrated solution and 14.4 ml of distilled water are taken in tube 1. Tube 2: V1 = 10 mL, D = 1/5, C2 = concentration of tube 1 Amount of Material in Diluted Solution (C1 × 10) = Amount of Material in Concentrated Solution (1.67 ppm × 15 mL)C1 = (1.67 ppm × 15 mL) / 10 mL × 1/5 = 5.005 ppm.

Amount of material to be taken in tube 2 = 10 ml × 1/5 = 2 ml.

Therefore, 2 ml of the solution from tube 1 and 8 ml of distilled water are taken in tube 2.

Tube 3: V1 = 5 mL, D = 1/20, C2 = concentration of tube 2.Amount of Material in Diluted Solution (C1 × 5) = Amount of Material in Concentrated Solution (5.005 ppm × 10 mL)C1 = (5.005 ppm × 10 mL) / 5 mL × 1/20 = 1.25125 ppm.

Amount of material to be taken in tube 3 = 5 ml × 1/20 = 0.25 ml.

For more such questions on Concentration

https://brainly.com/question/29521394

#SPJ8

True or False?


1. Water does not control Earth’s temperatures because the maximum amount of water vapor in the atmosphere depends on the air temperature.

2. Oxygen is a minor component of the atmosphere but a major contributor to global warming.

3. Greenhouse gases consist of molecules with 3 or more atoms

4. Greenhouse gases with asymmetric vibrations DO NOT absorb infrared energy

5. Ozone is a naturally occurring gas (O3) that absorbs UV rays, preventing them from reaching Earth's surface

6. Increasing concentrations of carbon dioxide are responsible for rising global temperatures

7. Preventing pollution at its source is harder than remediating a polluted ecosystem

8. Greenhouse gases vary in their ability to trap heat.

9. Water vapor is the most abundant greenhouse gas, accounting for over half of the warming of all the greenhouse gases.

10. Decreasing amounts of algal bloom kills plants below the water surface

11. Some naturally occurring atmospheric gases, such as carbon dioxide and methane, help hold in warmth radiating off the surface of Earth.

12. Fracking is a safe method of oil and natural gas extraction.

Answers

1. Water controls Earth’s temperatures so the statement is false.

2. Oxygen is not a minor component of the atmosphere. the statement is False.

3. Greenhouse gases consist of molecules with 3 or more atoms. It is true.

4. Greenhouse gases with asymmetric vibrations absorb infrared energy. False.

5. . Ozone is a naturally occurring gas (O3) that absorbs UV rays, preventing them from reaching Earth's surface. True

6. Increasing concentrations of carbon dioxide are responsible for rising global temperatures. True.

7. False, preventing pollution at is source is not harder.

8. It is true that green house gases vary in their ability to trap heat.

9. It is true.

10. Decreasing amounts of algal bloom kills plants below the water surface. it is False.

11. The statement is true.

12. It is is false.

Detailed Explanation

Greenhouse gases are gases that trap heat resulting to what is known as green house effects and contributing greatly to global warming. Examples include methane, carbon dioxide etc.

Water control Earth’s temperatures because it brings about cooling.

when there's precipitation, the surfac of the earth becomes cooler.

Learn more on Greenhouse gases on https://brainly.com/question/12684997

#SPJ1

Other Questions
x=55 Moving to another question will save this response. Question 2 of 3 Q on 2 8 points Save A A piple is carrying water under steady flow condition. At end point 1, the pipe diameter is 1.2 m and velocity is (x+30) mm/h, where x is the last two digites of your student ID. At other end called point 2, the pipe diameter is 1.1 m, calculate velocity in m/s at this end. Scan the solution and upload it in vUWS. Do not email to the lecturer. To what extent are the ecologist's and the economist's concepts of sustainable behavior mutually consistent? PART B Question 1 "When business users want data, they send request to the data processing (DP) specialist. For each request, the DP specialist has to create programs to retrieve data from the file" State FIVE (5) problems of file file system data processing. (5 marks Question 2 Hospital Segamat receives a lot of patients and they are given medications that are prescribed by a particular doctor. The patients often receives more than one type of medications. a) Produce THREE (3) sets of business rules that you can extract from the situation above between MEDICATION, DOCTOR and PATIENT. b) Based on the business rules below, draw the Entity Relationship Model using Crow's Foot Notation. "A coach can train many players, a player can be trained by a coach" Use the given interpretations to translate the followingarguments written in predicate logic into natural, Englishsentences.Ax: "x is an athlete"Bx: "x is brawny"Cx: "x is a champion" In examining the scoring of students for business statistics, a sample of 16 students revealed that they score, on average, 65 percent. Based on previous semesters, the population standard deviation is thought to be 53 percent. Assuming that the scores are normally distributed, find a 95% confidence interval for the average score. A. [39.03, 90.97] B. [34.18, 95.82] C. [30.87, 99.13] D. [18.12, 100.00] What is printed by the following statements? alist = [1, 3, 5] blist=[2, 4, 6] print(alist + blist) [3, 7, 11] O [1, 2, 3, 4, 5, 6] [1, 3, 5, 2, 4, 6] How long will it take for \( \$ 2,300 \) to double if it is invested at 10 . decimal placos: It will take years to double. How long will it take if the interest is compounded continuously" Compounded Forrester and Cohen is a small accounting firm, managed by Joseph Cohen since the retirement in December of his partner Brad Forrester. Cohen and his 4 CPAs together bill 800 hours per month. When Cohen or another accountant bills more than 160 hours per month, he or she gets an additional "overtime" pay of $62.00 for each of the extra hours: This is above and beyond the $5,100 salary each draws during the month. (Cohen draws the same base pay as his employees.) Cohen strongly discourages any CPA from working (billing) more than 230 hours in any given month. The demand for billable hours for the firm over the next 6 months is estimated below: Cohen has an agreement with Forrester, his former partner, to help out during the busy tax season, up to 230 hours in any given month if needed, for an hourly fee of $125. Cohen will not even consider laying off one of his colleagues in the case of a slow economy. He could, however, hire another CPA at the same salary, as business dictates. This exercise contains only part a. a) Develop an aggregate plan for the 6-month period (enter your responses as whole numbers). Use regular time, then overtime, then Forrester, and then hire additional CPAs if needed. Note: For the CPA column, only include Cohen, his 4CPAs, and any new CPAs he may hire in your total. Do NOT include Forrester. radius of 4000miles while flying 10miles above the surface. something unusal on the horizon infront of her, how far away is she Use the Integral Test to determine whether the series converges. Show all work to justify your answer. 11) n=1[infinity]n 2+53n _ is the process when clean,clear lakes rich with life becomeshallow, stagnant low Dissolved Oxygen systems with fewer tolerantspecies left. In its first month of operations, McLanie Company made three purchases of merchandise in the following sequence: (1) 300 units at $6, (2) 400 units at $8, and (3) 500 units at $9. Calculate the average unit cost. resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. at the moment contact is made with the battery (a) the voltage across the capacitor is a) equal to the battery's terminal voltage. b) less than the battery's terminal voltage, but greater than zero. c) equal to the battery's terminal voltage. d) zero. (b) the voltage across the resistor is a) greater the battery's terminal voltage. b) less than the battery's terminal voltage, but greater than zero. c) equal to the battery's terminal voltage. d) zero. 5. an electron moving in the direction of the x-axis enters a magnetic field. if the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region points in the direction of the a) z-axis. b) -z-axis. c) -x-axis. d) y-axis. e) -y-axis. 6. if the bar magnet and the loop repel each other as shown by the red arrows, what is the direction of the current in the loop? a) out of the top, in at the bottom. b) in at the top, out at the bottom. c) either a or b would cause the current and the bar magnet to repel each other. d) the situation sketched cannot happen. e) none of the above. 2.5 Do you agree with SECTION B 5 (15 marks) Diary entry Imagine you are the main character. An event that causes tension occurs. Write a diary entry in which you express your feelings after this event. Your words must be 80 -100. (20 marks) For this discussion board, you will explain Goffman's idea of self and why you agree or disagree.Explain Goffman's idea that there is not a true self, but the self is limited to the different masks we wear depending on the different roles we play in our everyday life. What does this mean? Explain why you agree or disagree with Goffman. A Circle With Centre C Has Equation X2+Y210y+20=0 (A) By Completing The Square, Express This Equation In The Form X2+ Find the value of x if A, B, and C are collinear points and B is between A and C.AB=5,BC=3x+7,AC=5x2 For this problem, we are creating a multi-class program to track our stamp collection. Your Stamp class is a business class and CANNOT HAVE ANY USER INTERACTION. It must contain the following instance variables:typefaceAmountissueDatevalueYou must create a no argument constructor. Default values are type - Not known, faceAmount 0, issueDate July 4, 1776, value 0. You must also provide getters and setters for the variables. You must have a toString method that returns the formatted String for the contents of the Stamp class. Any direct user interaction with this class will result in a 10 point deduction.You will create a driver program allowing the user to create an array of Stamp objects. Allow the user to specify how many stamps they want to enter. You should have a method allowing the user to enter the information for a Stamp. This method should return a Stamp object to be added to the array.You are only allowed to have one Scanner in your program and you must read information in the following order, type, face value, issue date, and current value.Once the user has entered all of their information, you should call a method, passing your array to it, to print the list of stamps. You are only allowed to use the keyword static once in your program.Sample output:Please enter the face value, in cents, for American revolution postage1Please enter the issue date for American revolution postageJuly 4, 1776Please enter the current value, in dollars, for American revolution postage100,000Please enter the type for your stamp.Current postagePlease enter the face value, in cents, for Current postage52Please enter the issue date for Current postageApril 27, 2022Please enter the current value, in dollars, for Current postage.52Please enter the type for your stamp.Turn of the century postagePlease enter the face value, in cents, for Turn of the century postage2Please enter the issue date for Turn of the century postageJanuary 1, 1900Please enter the current value, in dollars, for Turn of the century postage100Stamp: Type = American revolution postageFace Amount = 1.0, Issue Date = July 4, 1776, value = 100000.0Stamp: Type = Current postageFace Amount = 52.0, Issue Date = April 27, 2022, value = 0.52Stamp: Type = Turn of the century postageFace Amount = 2.0, Issue Date = January 1, 1900, value = 100.0 For a gas that obeys the van der Waals equation of state at a pressure of 2.3 bar, temperature of 301 K, how does the entropy of the gas change during isothermal compression from an initial specific volume of 4.32 L/mol to a final specific volume of 2.59 L/mol? Report your answer with units of J/mol/K. The energy and volume corrections (a and b, respectively) for this van der Waals gas can assumed to be a constant 8.3 L2/mol2 and 0.10 L/mol. Evaluate Cxds where C is the curve y=x 2from (1,1) to (1,1).