It will take approximately 26.5 seconds for 65% of the initial quantity of reactant to be consumed in this first-order reaction.
The integrated rate law for a first-order reaction is:
ln([A]t/[A]0) = -kt
where [A]t is the concentration of a reactant at time t, [A]0 is the initial concentration, k is the rate constant, and ln is the natural logarithm.
To solve for t when 65% of the initial quantity of reactant is consumed, we can use the following steps:
Determine the concentration of reactant remaining after 65% is consumed:
[A]t = (1 - 0.65) [A]0 = 0.35 [A]0
Rearrange the integrated rate law to solve for time t:
t = -ln([A]t/[A]0) / k
Substitute the given values and solve for t:
t = -ln(0.35) / 0.0450 s⁻¹
t ≈ 26.5 seconds
Therefore, it will take approximately 26.5 seconds for 65% of the initial quantity of reactant to be consumed in this first-order reaction.
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approximately how much of the anthropogenic carbon dioxide in the atmosphere has dissolved into the ocean?
It is estimated that since the beginning of the Industrial Revolution, approximately 30% of the carbon dioxide (CO2) emitted by human activities has been absorbed by the oceans, leading to a process known as ocean acidification.
This absorption has helped to mitigate the effects of climate change, but it has also had negative impacts on marine ecosystems, including changes in ocean chemistry and increased acidity, which can harm marine organisms such as shellfish and coral. It is important to note that while the ocean has played an important role in mitigating climate change, continued emissions of carbon dioxide into the atmosphere will continue to have negative impacts on the environment and the climate system.
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malic acid is an intermediate metabolite of glucose metabolism. malic acid contains 35.821% c, 4.478% h, and 59.701% o by mass. what is the empirical formula for malic acid?
The empirical formula for malic acid is HO₂CCH=CHCOH₂,if it contains 35.821% C, 4.478% H, and 59.701% O by mass.
In science, the empirical formula of a synthetic compound is the easiest entire number proportion of particles present in a compound.[1] A straightforward illustration of this idea is that the empirical formula of sulfur monoxide, or somewhere in the vicinity, would essentially be Thus, just like the observational recipe of disulfur dioxide, S₂O₂. Accordingly, sulfur monoxide and disulfur dioxide, the two mixtures of sulfur and oxygen, have a similar experimental recipe. Nonetheless, their sub-atomic equations, which express the quantity of particles in every atom of a synthetic compound, are not something similar.
Malic acid or cis-butenedioic acid is a natural compound that is a dicarboxylic corrosive, a particle with two carboxyl gatherings. Its compound equation is HO₂CCH=CHCOH₂. Maleic acid is the cis-isomer of butenedioic corrosive, though fumaric acid is the trans-isomer. It is for the most part utilized as a forerunner to fumaric corrosive, and comparative with its parent maleic anhydride, maleic corrosive has not many applications.
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two gas tanks are linked by a connecting tube of negligible volume with a valve. one contains 15 l of nitrogen at 7.2 atm of pressure. the other contains 8.3 l of helium at 4.1 atm of pressure. if the valve is opened, what is the final pressure of the two tanks combined? select one: a. 142 atm b. 4.5 atm c. 6.1 atm d. 0.48 atm
The final pressure of the two tanks combined is c)6.1atm.So,correct option is c.
Boyle's law, likewise alluded to as the Boyle-Mariotte law, or Mariotte's regulation (particularly in France), is an exploratory gas regulation that portrays the connection among tension and volume of a bound gas. Boyle's law has been expressed as: Numerically, Boyle's regulation can be expressed as: or where P is the pressure of the gas, V is the volume of the gas, and k is a consistent. Boyle's law expresses that when the temperature of a given mass of restricted gas is constant, the result of its pressure and volume is likewise inversely proportional to each other.
According to boyle's law total pressure of any tank will be pressure exerted by it on a total volume of container.
In other words,pressure exerted by each tank =pressure value × (total volume of container)
Therefore,
From first tank, pressure is =7.2 × [15L/(15+8.3)]
=>pressure of first tank is = 7.2 ×(15/23.3)
=>pressure of first tank is =7.2×0.64377=4.635atm
Now,pressure of second tank is =4.1 × [8.3 / (8.3+15) ]
=>pressure of second tank is =(4.1) × [8.3 / 23.3]
=>pressure of second tank is =4.1×0.356=1.46atm
Therefore,total pressure exerted by two tanks combines=1.46atm + 4.635atm=6.095atm=6.1atm.
Hence,option c is correct.
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. you have a solution at ph 12 containing 0.1 moles of histidine. write the main chemical reaction that would take place as you are adding the final drop of: (just indicate the functional group involved) a). 0.05 moles hcl
When you add hydrochloric acid (HCl) to a solution of histidine (pH 12), the following chemical reaction takes place:
Histidine + H+ + Cl- --> Histidine-H+Cl-
The functional groups involved in this reaction are the carboxyl group (-COOH) and the amino group (-NH2) of histidine, which can react with H+ and Cl-, respectively, to form the histidine-H+Cl- salt.
A chemical reaction is a process that leads to the transformation of one set of chemical substances into another. During a chemical reaction, chemical bonds between atoms are broken and new bonds are formed, resulting in a rearrangement of atoms and the creation of new molecules or compounds.
Chemical reactions can be represented by chemical equations, which typically show the reactants on the left side of the equation and the products on the right side. The chemical equation also includes the stoichiometry of the reaction, which indicates the number of molecules or moles of each reactant and product involved.
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If a reaction is first order with a rate constant of 0.0450 s', how much time is required for 65% of the initial quantity of reactant to be consumed?
[tex]13.86 seconds[/tex] required for 65% of the initial quantity of reactant to be consumed
A first order reaction's rate constant is provided by:
rate = k[A]
A reactant is a substance that participates in a chemical reaction and is changed into a product.
where [A] is the concentration of the reactant.
In this case, the rate constant is given as 0.0450 s-1.
To calculate the time required for 65% of the initial quantity of reactant to be consumed, we can use the following equation:
[tex]t = (\frac{1}{k})[ln(1 - 0.65)][/tex]
Substituting the values, we get:
[tex]t = (\frac{1}{0.0450 s^{-1}})[ln(1 - 0.65)] \\\\t= 13.86 s[/tex]
Therefore, it will take [tex]13.86 seconds[/tex] for 65% of the reactant's original volume to be consumed.
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describe what you would do, experimentally, to the mixed fractions in order to increase your overall percent yield g
Generally, percent Yield is defined as the actual yield divided by the theoretical yield multiplied with 100. There are lots of reasons why the actual yield of a chemical reaction may be less than the theoretical yield.
The following steps should be taken to increase the percent yield of a chemical reaction which are noted below.
Reagents should be added dropwise if necessary.Continuously stirring should be done throughout the chemical reaction. The temperature of reaction and liquid reagents should be carefully kept at the correct level during addition and reaction.Reaction should be monitored carefully throughout the experiment, so that the observations would be accurate.Learn more about percent yield from the link given below.
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What are three ways synthetic polymers affect the environment? (Worth 100 points)
A. Some synthetic polymers use materials from Earth that are nonrenewable.
B. They can end up as waste products that sometimes can’t be recycled.
C. They sometimes release toxins into the environment.
D. They’re available in limited amounts, so their supply will soon get depleted.
E. They don’t share the same properties as the materials they’re made of.
Answer:
I Choosed:
A. They can end up as waste products that sometimes can’t be recycled.
B. They sometimes release toxins into the environment.
C. They use materials from Earth that are nonrenewable.
Explanation:
A. Synthetic polymers, such as plastic, can end up as waste in landfills, oceans, and other natural areas. This can cause a variety of environmental problems, as some types of plastic do not break down easily and can persist in the environment for decades or even centuries. This accumulation of waste can have negative impacts on wildlife, ecosystems, and human health.
B. Some synthetic polymers are made using harmful chemicals that can leach out and release toxins into the environment. These toxins can have negative impacts on wildlife, ecosystems, and human health. For example, some types of plastic contain chemicals such as bisphenol-A (BPA) that have been linked to hormone disruption and other health problems.
C. The production of synthetic polymers often requires the use of nonrenewable resources, such as petroleum and natural gas. These resources are finite and their extraction and processing can cause environmental damage, including air and water pollution and habitat destruction. The continued use of these nonrenewable resources can exacerbate environmental problems and contribute to climate change.
These are three ways that synthetic polymers can affect the environment, and it's important to consider the impacts of these materials in order to minimize their negative effects and promote sustainability.
is H2 a covalent compound?
Answer:
yes
Explanation:hydrogen two non-metals bonded together that makes a covalent or molecular compound
how much nacl would you need to make a 100 ml of a 500mm solution? nacl has a molecular weight of 58.44 g
You would require roughly 2.92 g of NaCl to make 100 mL of a 500 mM solution.
To make 100 mL of a 500 mM solution of NaCl, you need to compute the number of moles of NaCl you would have to add to the solution.
The concentration of the solution in moles per liter (M) can be determined by utilizing the equation:
C = n/V
where C = concentration (in M)
n = the number of moles of solute,
furthermore, V = the volume of the solution in liters.
In this way, to make 100 mL (0.100 L) of a 500 mM solution, you would have to add 0.100 L * 500 mM = 0.050 moles of NaCl to the solution.
At long last, by utilizing the molecular weight of NaCl we can find the number of grams required:
0.050 moles * 58.44 g/mole = 2.92 g
So you would require roughly 2.92 g of NaCl to make 100 mL of a 500 mM solution.
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the volume of a gas at 5.0 atm is 3.5 l. what is the volume of the gas at 7.0 atm at the same temperature?
At the same temperature, the gas has a 2.5 L volume at 7.0 atm. Volume in the context of gases is the quantity of space a gas takes up.
The ideal gas law, which connects a gas's pressure, volume, and temperature, can be used to solve this issue. PV = nRT. Assuming that the temperature stays constant, we may apply the ideal gas law in the following manner: P1V1 = P2V2. With the supplied values plugged in, we obtain (5.0 atm)(3.5 L) = (7.0 atm) (V2). We can calculate V2 as follows: V2 = (5.0 atm)(3.5 L) / (7.0 atm) = 2.5 L. As a result, the gas has a 2.5 L volume at the same temperature at 7.0 atm. In many industrial, scientific, and medical applications, accurate gas volume measurement and management are crucial.
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In the SI system of units, the mole is one of seven base units. It is frequently used in
chemical calculations. However, a mole of something is just a particular quantity of it. It
is not a unit of measure in the way that meters, seconds, and kilograms are.
Calculations performed with the number of moles of a substance could also be
performed with the number of particles of a substance. Based on this information, do
you think that the mole should be considered a base unit in the SI system? Explain why
or why not.
Answer:
Whyyy
Explanation:
The mole should be considered a base unit in the SI system because it is widely used in chemical calculations as a standard unit for counting the number of particles in a substance. The mole allows for easy and accurate calculation of the amount of substance, which is a crucial aspect in many chemical processes. In addition, the mole is defined as the number of entities in a substance, such as atoms, molecules, or ions, and its definition is based on Avogadro's constant. The mole also has practical applications in fields such as pharmacology and environmental science, where the measurement of a specific quantity of a substance is essential.
In conclusion, the mole is a necessary unit for the SI system of units due to its widespread use in chemical calculations and its important role in accurately measuring the amount of substance in a variety of scientific disciplines.
Determine the mean absolute deviation for when any ice was present. How can the men’s deviation be improved?
Inspire science notebook (energy in atmosphere) page 36
Answer: Clarify your question please.
Explanation:
I'm sorry, but I need more context to determine the mean absolute deviation for "when any ice was present" and how to improve the men's deviation. Can you provide more details or clarify your question?
sort these nucleotide building blocks by their name or classification.
Depending on the molecule's chemical composition, they can be purines or pyrimidines.
Nucleotide building blocks are the monomers (single molecules) that make up nucleic acids, such as deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). They are classified as either purines or pyrimidines, depending on the chemical structure of the molecule.
Purines: Adenine (A), Guanine (G)
Pyrimidines: Cytosine (C), Thymine (T), Uracil (U)
Sorted by name: Adenine (A), Cytosine (C), Guanine (G), Thymine (T), Uracil (U)
Sorted by classification: Purines: Adenine (A), Guanine (G) Pyrimidines: Cytosine (C), Thymine (T), Uracil (U).A nucleotide is the basic structural unit of nucleic acids such as DNA and RNA.
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complete question:sort these nucleotide building blocks by their name or classification. from below image
How the angle b/w AB6 type molecules is 90
The angle between AB6 molecules is determined by the number of bonds between the atoms. AB6 molecules are molecules that are composed of six atoms in a ring. Each of the atoms is connected to two other atoms.
What is the atoms?Atoms are the basic building blocks of all matter. They are the smallest particles of an element that still retain their chemical identity. Atoms are composed of a nucleus made of protons and neutrons, surrounded by electrons in shells. The number of protons in an atom determines the element it is, and the number of neutrons can vary to give different isotopes of the same element. Atoms can be combined by chemical bonds to form molecules and other compounds. The properties of an atom are determined by its electron configuration which can be altered by chemical reactions.
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concentrated hcl is a 12.0 m solution in water and has a density of 1.22 g/ml. a. what is the molality of hcl in the solution?
The molality of HCl in the solution is[tex]0.00122 mol/kg[/tex]
Molality is defined as the number of moles of a solute in one kilogram of a solvent. In this case, the solvent is water.
To calculate the molality, we first need to calculate the molarity of the solution. Molarity is defined as the number of moles of a solute in one liter of solution.
To calculate the molarity, we need to know the mass of the solute (HCl) and the volume of the solution. The mass of the solute can be calculated using the density of the solution (1.22 g/ml):
Mass of HCl =[tex]Density * Volume[/tex]
Volume = [tex]\frac{Mass}{Density }[/tex]
Volume =[tex]\frac{(12.0 mol/L) }{ (1.22 g/ml) }= 9.839 L[/tex]
Molarity = [tex]\frac{ (12.0 mol/L) }{(9.839 L) }= 1.22 mol/L[/tex]
Now, we can calculate the molality:
Molality = [tex]\frac{ (1.22 mol/L) }{(1000 g/kg) }= 0.00122 mol/kg[/tex]
Therefore, the molality of HCl in the solution is [tex]0.00122 mol/kg[/tex].
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PLease help its a chemistry Question (classifications of reactions) (I WILL MARK BRAINLIST!!) please see image attached below
thank you
The reaction that represents a chemical change in which a compound is broken down into two simpler compounds is reaction a.
What is a decomposition reaction?A decomposition reaction is a reaction in which a compound breaks down into two or more smaller compounds. It is opposed to a synthesis reaction in which two or more compounds combine to form a single compound.
Thus, for decomposition reactions: A ---> B + C
For synthesis reactions: A + B --> C
From reactions a to d shown in the illustration, only reaction a agrees with the features of a decomposition reaction.
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a 17.90 17.90 g sample of a compound contains 5.71 5.71 g of potassium, k, k , 5.18 5.18 g of chlorine, cl, cl , and oxygen, o. o . calculate the empirical formula. insert subscripts as needed.
The molecular formula of a compound gives the actual number of atoms of various elements present in a molecule. The empirical formula is KClO₂.
What is empirical formula?The empirical formula of a compound is defined as the formula which gives the simplest whole number ratio of atoms of various elements present in one molecule of the compound.
Number of moles (n) = Given mass / Molar mass
'n' of 'K' = 5.71 / 39.09 = 0.1460 moles
'n' of 'Cl' = 5.18 / 35.45 = 0.1461 moles
'n' of 'O' = 5.18 / 15.99 = 0.3238 moles
To get simple whole number ratio:
K = 0.1460 / 0.1460 = 1
Cl = 0.1461 / 0.1460 = 1
O = 0.3238 / 0.1460 = 2
Thus the empirical formula is KClO₂.
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a prescription for chad calls for triamcinolone injectable suspension 10mg/ml to be diluted down to 0.125 mg/ml by adding distilled water. how much triamcinolone suspension and how much water must be added to make 480ml of the final product?
To dilute the triamcinolone injectable suspension from 10mg/ml to 0.125 mg/ml, we need to dilute it 80 times (since 10 ÷ 0.125 = 80). This means that we need to add 1 part of the 10mg/ml suspension to 79 parts of distilled water.
To calculate how much of each we need, we can use the following formula:
C1V1 = C2V2
where C1 is the initial concentration (10mg/ml), V1 is the initial volume (unknown), C2 is the final concentration (0.125mg/ml), and V2 is the final volume (480ml).
First, we can solve for V1:
C1V1 = C2V2
10mg/ml x V1 = 0.125mg/ml x 480ml
V1 = (0.125mg/ml x 480ml) / 10mg/ml
V1 = 6ml
So we need 6ml of the 10mg/ml triamcinolone injectable suspension.
Next, we can calculate how much distilled water we need to add:
Total volume - volume of triamcinolone suspension = volume of distilled water
480ml - 6ml = 474ml
Therefore, we need to add 6ml of the 10mg/ml triamcinolone injectable suspension and 474ml of distilled water to make 480ml of the final product with a concentration of 0.125mg/ml.
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Which would be an invalid listing within an electron configuration?
a) 2s2
b) 5d9 c) 3p4 d) 1s3
Ans) d- 1s3
How can you find electronic configuration for this?The s- orbital can accommodate up to two electrons. The aforementioned configuration is faulty because there are three "s" electrons, which is not conceivable.
Since there are two electrons, 2s2 is conceivable.
The greatest number of electrons in the d orbital is 10. Thus, 5d9 is also conceivable.
The p orbital can accommodate up to 6 electrons. So 3p4 is also a possibility.
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2. Some gold used for jewelry is called '18-karat white gold. This alloy is 75% gold (Au), 12.5%
silver (Ag), and 12.5% copper (Cu). If you wanted to make 25 grams of 18-karat white gold for a
ring, how many grams of each metal would you need to start with?
If you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.
What is gold?Gold has the chemical symbol Au (from Latin: aurum) as well as the atomic number 79. As a result, it is one among the highest atomic number elements found in nature.
Some gold used for jewelry is called '18-karat white gold. This alloy is 75% gold (Au), 12.5% silver (Ag), and 12.5% copper (Cu). If you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.
Therefore, if you wanted to make 25 grams of 18-karat white gold for a ring then grams of each metal will remain same.
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you have a substance that turns violet when biuret is added, black when iodine is added, no change with benedict's reagent, and leaves no oily spot on a brown paper bag. given the above information, what csn conclude about this substance?
From the observations we can conclude that the substance contains protein and starch.
The different observations are given below:
Biuret - Violet (Violet color represents +ve for proteins)
Iodine - Black (Black color represents +ve for starch)
Benedicts - no change ( No change in color represent -ve due to absent of reducing sugar)
Sudan VI- (-ve as there is not lipid)
So, these results strongly suggest that substance is having protein and starch and showing positive test for these macromolecules in the sample as violet color for in biuret test and black while using iodine.
Therefore, assuming all the observations we can conclude that the substance contains protein and starch.
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you are experimenting with blood samples and you place a drop of rbcs into a solution of 100 millimoles of cacl2. what effect does this have on the rbcs?
You are experimenting with blood samples and you place a drop of rbcs into a solution of 100 millimoles of CaCl2, there is no efect on RBCs.
The reason why the cell would shrink further in CaCl2 result is because it has a advanced van't Hoff factor i.e. total number of separated ionic species per solute patch( it is 2 for NaCl whereas it's 3 for CaCl2).
Nonionic solutes don't disconnect and will thus have a van't Hoff factor of 1)
Bibulous pressure( and other colligative parcels) are commensurable to van't Hoff factor. thus bibulous pressure in CaCl2 result will be3/2 times of that in an equimolar NaCl result.
Note that the ionic chemical eventuality isn't what drives osmosis; it's the discriminational attention of water( or any other detergent) that drives it.
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7. What is the
concentration of a solution in
parts per million, if 0.45 gram of KNO,
is dissolved in 1000. grams of water?
(1) 450 ppm
(2) 4.5 × 10-5 ppm
(3) 4.5 x 10 ppm
(4) 225 ppm
7
The concentration of the solution in parts per million (ppm) is 450. The correct answer is (1) 450 ppm.
What is 1ppm?1 ppm (parts per million) is a unit of measurement used to express the concentration of a substance in a solution or mixture. It indicates the ratio of the number of units of a particular substance to the total number of units in the mixture, with each unit typically being a single molecule or ion.
To calculate the concentration of a solution in parts per million (ppm), we use the following formula:
Concentration (ppm) = (mass of solute / mass of solution) x 10^6
In this case, the mass of solute (KNO3) is 0.45 gram and the mass of solution is 1000 grams (1 liter of water). Putting up these values in the formula, we get:
Concentration (ppm) = (0.45 / 1000) x 10^6 Concentration (ppm) = 450
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Which of the following questions would most likely be investigated by a chemist?
Answer:
Chemists typically investigate questions related to the composition, structure, and properties of matter, as well as its interactions with energy and other substances. Some examples of questions that a chemist might investigate include:
What is the chemical composition of a given substance?
How does the structure of a molecule affect its properties?
How do different chemical reactions occur, and what are the conditions necessary for them to occur?
How do substances interact with one another in solution?
What is the rate at which a chemical reaction occurs, and how can it be influenced by various factors such as temperature, pressure, and concentration?
Explanation:
These are just a few examples of the types of questions that a chemist might investigate. In general, a chemist's research is focused on understanding the underlying principles and processes of matter and energy at the molecular and atomic level.
How many atoms of manganese
are in 250.0 g of braunite,
Mn3SiO6? The molar mass of
braunite is 288.91 g/mol.
? ] × 10[?]
x
atoms Mn
Answer:
1.56x10^23 atoms of Mn
Explanation:
250 grams of braunite (Mn3SiO6) is:
(250 g)/(288.91 g/mole) = 0.865 moles of Mn3SiO6
One mole of Mn3SiO6 would contain 3 moles of Mn, since it appears 3 times in the compound. Breaking apart 1 mole of Mn3SiO6 into individual atoms of each element would procude 3 moles of Mn atoms (and 1 mole of Si and 6 moles of O atoms),
Since we have 0.865 moles of Mn3SiO6,
we should have:
(0.865 moles of Mn3SiO6)*((3 moles of Mn)/(1 mole Mn3SiO6))
this is equal to 2.596 moles of Mn atoms
Since 1 mole is 6.02x10^23 particles of anything, we can write:
(2.596 moles of Mn)*(6.02x10^23 particles Mn atoms/mole) =
1.56x10^23 atoms of Mn
write a brief conclusion to the experiment summarizing the experimental conditions that gave rise to the greatest observed electrical conductivity.
A brief conclusion to the experiment summarizing the experimental conditions that gave rise to the greatest observed electrical conductivity:
To observe electrical conductivity of substances in colorful waterless resultsTo determine of the result is a strong or weak electrolyteTo interpret a chemical response by observing waterless result conductivity.Electrical conductivity is grounded on the inflow of electrons. Essence are good operators of electricity because they allow electrons to flow through the entire piece of material. therefore, electrons flow like a “ ocean of electrons ” through essence. In comparison, distilled water is a veritably poor captain of electricity since veritably little electricity flows through water. largely ionized substances are strong electrolytes. Strong acids and mariners are strong electrolytes because they fully ionize( disconnect or separate) in result. The ions carry the electric charge through the result therefore creating an electric current.
Slightly ionized substances are weak electrolytes. Weak acids and bases would be distributed as weak electrolytes because they don't fully disconnect in result.
Substances that don't conduct an electric current are called non-electrolytes. Non-electrolytes don't ionize; they don't contain portable ions. The LEDs of a conductivity cadence won't light because there are no ions to carry the electric current. The table below lists exemplifications of strong, weak and non-electrolytes.
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draw the structure of cis−jasmone, a natural product isolated from jasmine flowers, formed by treatment of alkyne a with h2 in the presence of the lindlar catalyst. click the draw structure button to launch the drawing utility.
Cis-jasmone is a natural product with a molecular formula of C11H16O. It has a cyclopentenone ring and an unsaturated side chain with a cis double bond. The structure of cis-jasmone can be drawn as follows:
H
|
H--C--O
| |
H--C--C--C--CH3
| | |
H H--C=C
|
H
The synthesis of cis-jasmone from alkyne A using H2 in the presence of the Lindlar catalyst involves the hydrogenation of the alkyne to form a cis-alkene, followed by cyclization to form the cyclopentenone ring.
Cis-jasmone is a natural organic compound with the molecular formula C11H16O. It has a cyclopentenone ring and an unsaturated side chain with a cis double bond. Cis-jasmone is a fragrant compound that is responsible for the characteristic aroma of jasmine flowers. It is used in perfumes and as a flavoring agent in the food industry.
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Tin is an example of an element that has a great number of naturally occurring isotopes. How many neutrons are in tin-120?
Tin being an example of an element that has a great number of naturally occurring isotopes, it has 70 neutrons in total.
Tin-120 is an isotope of tin with an atomic number of 50, which means it has 50 protons in its nucleus. To find the number of neutrons in tin-120, we need to look at its atomic mass, which is typically given in atomic mass units (amu).
The atomic mass of tin-120 is approximately 120 amu. Since the atomic mass of an atom is the sum of its protons and neutrons, we can calculate the number of neutrons in tin-120 by subtracting the atomic number (50) from the atomic mass (120):
number of neutrons = atomic mass - atomic number
= 120 - 50
= 70
Therefore, tin-120 has 70 neutrons.
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Water and sand are being separated by filtration. What physical change is used?
Felting is a physical procedure. The mixture of the given solid and the liquid can be separated using filter paper in this process, for example, sand and water can be separated using filter paper.
What is filtration ?Filtration is the process of removing solid particles from a liquid or gaseous fluid by using a filter medium that allows the fluid to pass through but retains the solid particles. The desired product could be either the clarified fluid or the solid particles removed from the fluid.
Separating sand from water is a physical process rather than a chemical one. Sand and water are a mixture that can be easily separated without the use of any chemicals. Sand can be filtered out of the water with a sieve and then dried to allow any remaining water to evaporate.
Thus,Water and sand are being separated by filtration.Felting is used as a physical change.
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a sample has a mass of 23.5g. when the sample is lowered into the water in a graduated cylinder, the water level rises from 23.8 ml to 28.5 ml. what is the density of this metal?
In the given sample, when the water level is rises from 23.8ml to 28.5 ml, the density of the metal is 5.00 g/cm³
To find the density of the metal, we need to use the formula:
density = mass / volume
We are given the mass of the metal as 23.5 g. To find the volume of the metal, we need to subtract the initial volume of water in the cylinder from the final volume of water after the metal is added. The difference in volume is equal to the volume of the metal.
The initial volume of water is 23.8 ml, and the final volume of water is 28.5 ml, so the volume of the metal is:
volume = final volume - initial volume
volume = 28.5 ml - 23.8 ml
volume = 4.7 ml
Now we can substitute the values for mass and volume into the density formula:
density = mass / volume
density = 23.5 g / 4.7 ml
We need to convert the volume to cubic centimeters (cm³) because the units of density are expressed in g/cm³.
1 ml is equal to 1 cm³, so:
density = 23.5 g / 4.7 cm³
density = 5.00 g/cm³ (rounded to two decimal places).
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