The average atomic mass for the new element is given 81.5529 amu. The percentage abundance for the third isotope is 13.6 %. Then its atomic mass is 83.9 amu.
What are isotopes?Isotopes are atoms of same element with different atomic mass numbers. Almost all elements have two or more isotopes but not all of them are stable in nature.
The average atomic mass can be calculated from the isotopic mass and and percentage abundance as follows:
atomic mass = ∑ (isotopic mass × %abundance /100 )
Apply the isotopic mass and abundance of all isotopes given as follows:
atomic mass of the element = (76.12/100 ×81.6643 amu) + (10.27/100 × 81.1239 amu) + (13.6 /100 × X amu) =81.5529 amu.
Then,
(13.6 /100 × X amu) = 70.41 amu.
X = 83.9 amu.
Therefore, the atomic mass of the third isotope is 83.9 amu.
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iupac name for this compound
The IUPAC name for the given compound is "heptanal oxime."
What is heptanal oxime?Heptanal oxime, also known as heptan-2-one oxime, is an organic compound with the chemical formula C7H15NO. It is an oxime derivative of the ketone heptan-2-one. Heptanal oxime is a colorless to pale yellow solid that is sparingly soluble in water, but soluble in many organic solvents.
Heptanal oxime is used as a chemical intermediate in the production of various compounds, such as agrochemicals, pharmaceuticals, and fragrances. It is also used as a chelating agent to form stable complexes with various metals, such as copper and iron.
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What are unusual qualities of water
Answer:
Water has several unusual properties that are important to life and the functioning of the earth's ecosystem. Some of these qualities include:
High Specific Heat: Water has a high specific heat, which means it requires a lot of heat energy to raise its temperature. This helps regulate the temperature of living organisms and the earth.
Cohesion and Adhesion: Water molecules stick to each other, creating surface tension. This property allows it to be drawn up through small tubes and to climb against gravity in plants.
Density Anomaly: Unlike most substances, water is less dense in its solid form than in its liquid form. This is why ice floats on water.
Polarity: Water is a polar molecule, meaning it has a positive and negative end. This polarity makes water an excellent solvent, capable of dissolving ionic and polar molecules.
High Heat of Vaporization: Water has a high heat of vaporization, which is the amount of heat energy required to convert liquid water into water vapor. This property makes water an effective coolant and helps regulate the earth's temperature.
Explanation:
A beaker is known to contain 4.65x1024 molecules of sucrose, C12H22O11. How many cg of sucrose does the beaker hold?
According to the question, 1.6 x 1028 cg of sucrose does the beaker hold.
What is sucrose?
Sucrose is a type of sugar that is naturally present in many fruits and vegetables, and is also known as table sugar. It is composed of two simple sugars, glucose and fructose, and is the most common form of dietary sugar. It is used to sweeten many foods and beverages, and is also used in the food industry as a preservative. Sucrose is a disaccharide, which means that it is composed of two monosaccharides, or simple sugars, linked together.
The mass of a molecule of sucrose (C12H22O11) is 342.3 g/mol. Therefore, the number of cg of sucrose in the beaker is:
4.65 x 1024 molecules x 342.3 g/mol x 1 cg/10-2 g = 1.59 x 1028 cg
This can be further simplified to 1.6 x 1028 cg.
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Which of the following happens when an ionic bond is formed? (1 point)
O One atom becomes more electronegative than another atom.
O Two atoms share an electron.
O Two atoms attain equal electronegativities.
One atom pulls an electron from another atom.
One atom pulls an electron from another atom during formation of an ionic bond.
Ionic bond formation results in which of the following?
The complete transfer of certain electrons from one atom to another results in the formation of an ionic connection. A negatively charged ion known as a cation results from an atom losing one or more electrons. An anion, or negatively charged ion, is created when an atom gains one or more electrons.
To make stable atoms, ions are produced. In a chemical process known as an ionic bond, ions join forces with an atom or compound that has an opposing charge in order to become stable. Atoms are bound together during chemical processes to create neutral, stable molecules.
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true or false If an ice cube is in a glass of water at 0° and no thermal energy is added or removed then the ice cube and the water are in thermal equilibrium?
Answer:
True
Explanation:
When an ice cube is in a glass of water at 0°C and no thermal energy is added or removed, the ice cube and the water will reach thermal equilibrium. This means that the temperature of the system will remain constant and will not change over time. The ice cube will melt until it reaches the temperature of the water, which is 0°C, and the water will lose heat energy until it reaches the temperature of the ice cube, also 0°C. Once the temperatures of both the ice cube and the water are the same, the system is in thermal equilibrium.
Tell me if you kinda confuse :)
ALLEN
Answer:
Trur
Explanation:
2) A solution was made by dissolving 755 g of Na₂SO4 in 53, 100 g of
water. Calculate the morality, molality, and mole fraction of Na₂SO4.
A) Molarity
B) Molality
c) Mole fraction
Answer:
0.101 M
0.1 mol/kg
0.644
Explanation:
To calculate the molarity, molality, and mole fraction of Na2SO4 in a solution, you need to know the moles of Na2SO4 in the solution and the volume or mass of the solution.
A) Molarity: Molarity (M) is defined as the number of moles of solute per liter of solution. To calculate molarity, we need to divide the number of moles of Na2SO4 by the volume of the solution in liters.
First, calculate the number of moles of Na2SO4:
mass of Na2SO4 = 755 g
molecular weight of Na2SO4 = 142 g/mol
number of moles = mass/molecular weight = 755 g / 142 g/mol = 5.34 moles
Next, calculate the volume of the solution:
mass of water = 53,100 g
density of water = 1 g/mL
volume of water = mass/density = 53,100 g / 1 g/mL = 53,100 mL = 53.1 L
Finally, calculate the molarity:
molarity = number of moles / volume of solution = 5.34 moles / 53.1 L = 0.101 M
B) Molality: Molality (m) is defined as the number of moles of solute per kilogram of solvent. To calculate molality, we need to divide the number of moles of Na2SO4 by the mass of the solvent in kilograms.
mass of water = 53,100 g
mass of solvent in kilograms = mass in grams / 1000 g/kg = 53,100 g / 1000 g/kg = 53.1 kg
Finally, calculate the molality:
molality = number of moles / mass of solvent = 5.34 moles / 53.1 kg = 0.1 mol/kg
C) Mole fraction: The mole fraction (X) is defined as the ratio of the number of moles of solute to the total number of moles of solute and solvent in a solution. To calculate the mole fraction of Na2SO4, we need to divide the number of moles of Na2SO4 by the total number of moles of Na2SO4 and water.
number of moles of Na2SO4 = 5.34 moles
number of moles of water = 53.1 kg * 1000 g/kg / 18.015 g/mol = 2.96 moles
total number of moles = number of moles of Na2SO4 + number of moles of water = 5.34 moles + 2.96 moles = 8.30 moles
Finally, calculate the mole fraction:
mole fraction of Na2SO4 = number of moles of Na2SO4 / total number of moles = 5.34 moles / 8.30 moles = 0.644
The molarity of Na2SO4 in the solution is 0.101 M, the molality is 0.1 mol/kg, and the mole fraction of Na2SO4 is 0.644.
A scientist is trying to discover information about an unknown metal in a compound. The formula for the compound is believed
to be XBr, where X is the unknown metal. The scientist determined that a 4.742 g sample of this compound contains
4.877 x 10-2 mol Br. Calculate the atomic mass of the unknown metal, X.
atomic mass=
What is the identity of the metal? Provide the name or symbol of the element.
metal:
amu
Atomic mass of X is 813.022 g/mol and the element with an atomic mass closest to 813.022 g/mol is silver, Ag.
What is Atomic mass?
Atomic mass is the mass of an atom of a particular element, measured in atomic mass units (amu). It is equal to the sum of the number of protons and neutrons in the nucleus of an atom.
molar mass = (mass of Br) / (number of moles of Br)
molar mass = 4.742 g / (4.877 x 10-2 mol) = 974.74 g/mol
The molar mass of bromine is 80.904 g/mol, so the molar mass of the unknown metal X can be calculated as:
molar mass of X = molar mass of compound - molar mass of Br
molar mass of X = 974.74 g/mol - (3 * 80.904 g/mol) = 813.022 g/mol
The atomic mass of X can be calculated as the molar mass of X divided by the number of moles of X in the compound, which is 1:
atomic mass of X = molar mass of X / (number of moles of X)
atomic mass of X = 813.022 g/mol / 1 = 813.022 g/mol
Since the atomic mass of X is 813.022 g/mol, we can look up the element with that atomic mass in the periodic table. The element with an atomic mass closest to 813.022 g/mol is silver, Ag, with an atomic mass of 107.87 g/mol.
Therefore, Atomic mass of X is 813.022 g/mol and the element with an atomic mass closest to 813.022 g/mol is silver, Ag.
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What material do we get from trees that is burned as a fuel and releases carbon dioxide.
Burning biomass results in the production of nitrogen oxides, carbon monoxide, and carbon dioxide, as well as other pollutants and particulates.
Wood is the substance that is most frequently taken from trees and used as fuel. Burning wood produces carbon dioxide as a byproduct. One of the earliest techniques for producing energy is the consumption of wood, which has been used as a wellspring of intensity and light for a long time.
Wood sends carbon dioxide into the climate alongside energy. Considering that carbon dioxide is an ozone-depleting substance that traps heat in the air, it is an essential driver of environmental change when the wood is scorched.
Trees likewise produce extra side effects including debris, smoke, and water fume.
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For the reaction below, Kc = 1.10 × 10⁻⁴. Note Kc is sometimes called K.
What is the equilibrium concentration of C if the reaction begins with 0.200 M A and 0.300 M B?
2 A (aq) + B (aq) ⇌ C (aq)
Kc = 1.10 104 for the reaction detailed below. If the reaction starts with 0.200 M A with 0.150 M B, how much is the equilibrium level of C
What does the word reaction mean?
Chemical reaction is the transformation of one or more substances—the reactants—into one or more additional substances—the products. Chemical elements or chemical compounds make up substances.
Where do reaction take place?
The Earth's geology, the atmosphere, the oceans, and a wide variety of intricate processes that take place in all life processes are rife with chemical reactions. Physical changes and chemical must be differentiated.
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Draw the two products of the reaction as they occur in acid solution. Hydrogens on oxygen and nitrogen should be drawn, if applicable. Select Draw Rings More Erase с H N O H20 H30+ 2 0
The two reaction products as they appear in an acidic solution. Hydrogens on oxygen and nitrogen is drawn below:
Higher than that of pure water, an acidic solution has a high concentration of hydrogen ions (H +start superscript, plus, end superscript). A basic solution has a lower concentration of H +start superscript, plus, end superscript than pure water. Ammonia and water are just two examples of the simple molecules that hydrogen bonds can affect, but other simple molecules can also be affected. Moreover, the oxygen and nitrogen hydrogen bonds serve crucial functions in biochemistry, with DNA structure being the most well-known example.
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What is the new pressure if you expand 103.0 liters of air at 2.00 atm into a cylinder whose volume is 156.0 liters?
a
0.504 atm
b
2.33 atm
c
1.32 atm
d
3.03 atm
Answer:
Explanation:
The new pressure can be calculated using the Ideal Gas Law, which states that PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant (8.31 J/mol*K), and T is the temperature (assumed to be constant).
Since the number of moles of gas and temperature is constant, we can rearrange the equation to solve for the new pressure:
P = (NRT) / V
Using the initial conditions of P1 = 2.00 atm and V1 = 103.0 liters, we can find the new pressure P2 after the expansion to 156.0 liters:
P2 = (P1 * V1) / V2 = (2.00 atm * 103.0 liters) / 156.0 liters = 1.30 atm
Therefore, the new pressure is 1.30 atm, and the correct answer is (c) 1.32 atm.
Gas pressure depends only on the number of particles in a given volume and on their average kinetic energy. The type of particle does not matter.a. trueb. false
true. This assertion is correct. According to the kinetic theory of gases, gas pressure is defined by the quantity of gas particles in a given volume and their average kinetic energy.
The pressure of a gas is proportional to the frequency and force of collisions between gas particles and the container's walls. According to the kinetic theory of gases, gas pressure is defined by the quantity of gas particles in a given volume and their average kinetic energy. The type of particle makes no difference in calculating the pressure of a gas as long as the particles are all in the gas phase and behave according to the kinetic theory assumptions. The pressure of a gas is proportional to the frequency and force of collisions between gas particles and the container's walls.
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A sample of water has a mass of 100.0 g. Calculate the amount of heat required to change the sample from ice at -45.0°C to liquid water at 75.0°C. Use the chart to complete the multiple steps required to arive at the final answer. Type in your answers below using 3 digits.
q1 = kJ
q2 = kJ
q3 = kJ
qtot = kJ
Total heat required for all steps: Q1 + Q2 + Q3 + Q4 + Q5 = 309261 J.
How to calculate heat for the samples?
To calculate the amount of heat required to change the sample of water from ice at -45.0°C to liquid water at 75.0°C, we need to consider the heat required for the following steps:
Heat to bring the ice from -45.0°C to 0°C and melt itHeat to bring the liquid water from 0°C to 100°C and boil itHeat to bring the steam from 100°C to 75.0°CFor each of these steps, we can use the formula:Q = m × C × ΔT
where Q is the amount of heat required (in joules), m is the mass of the sample (in grams), C is the specific heat capacity (in joules/gram°C) and ΔT is the change in temperature (in °C).
Heat to bring the ice from -45.0°C to 0°C and melt it
To bring the ice from -45.0°C to 0°C, we need to add heat:
Q1 = m × Cice × ΔT1
where Cice is the specific heat capacity of ice (2.108 J/g°C), ΔT1 is the change in temperature (0°C - (-45.0°C) = 45.0°C).
Q1 = 100.0 g × 2.108 J/g°C × 45.0°C
Q1 = 9456 J
To melt the ice, we need to add heat:
Q2 = m × Lfus
where Lfus is the heat of fusion of water (333.55 J/g).
Q2 = 100.0 g × 333.55 J/g
Q2 = 33355 J
Total heat for step 1: Q1 + Q2 = 42711 J
Heat to bring the liquid water from 0°C to 100°C and boil it
To bring the liquid water from 0°C to 100°C, we need to add heat:
Q3 = m × Cwater × ΔT2
where Cwater is the specific heat capacity of liquid water (4.184 J/g°C), ΔT2 is the change in temperature (100°C - 0°C = 100°C).
Q3 = 100.0 g × 4.184 J/g°C × 100.0°C
Q3 = 41840 J
To boil the water, we need to add heat:
Q4 = m × Lvap
where Lvap is the heat of vaporization of water (2257 J/g).
Q4 = 100.0 g × 2257 J/g
Q4 = 225700 J
Total heat for step 2: Q3 + Q4 = 267540 J
Heat to bring the steam from 100°C to 75.0°C
To bring the steam from 100°C to 75.0°C, we need to remove heat:
Q5 = m × Csteam × ΔT3
where Csteam is the specific heat capacity of steam (1.996 J/g°C), ΔT3 is the change in temperature (75.0°C - 100.0°C = -25.0°C).
Q5 = 100.0 g × 1.996 J/g°C × (-25.0°C)
Q5 = -4990 J
Total heat for step 3: Q5 = -4990 J (since heat is being removed)
Total heat required for all steps: Q1 + Q2 + Q3 + Q4 + Q5 = 309261 J
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Answer:
q1 = ⇒ 9.42 kJ
q2 = ⇒ 226 kJ
q3 = ⇒ 31.4 kJ
qtot = ⇒ 267 kJ
Explanation:
I got it right edge 2023 <3
Which is NOT a limiting factor when it comes to applying motivation to employees in the hospitality industry?
A limiting factor when it comes to applying motivation to employees in the hospitality industry is Payment structure.
What is the structure?The structure of a essay is straightforward and simple.It typically consists of an introduction, two to three body paragraphs and a conclusion. The introduction should introduce the main topic and provide a brief overview of what will be discussed. The body paragraphs should provide more specific details about the main topic and should include supporting evidence. The conclusion should summarize the essay and provide a final thought or opinion. It is important to keep in mind that the essay should be free of plagiarism, so it is essential to write all content in one’s own words.
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What is the maximum concentration of equimolar solutions of ferrous sulphate and sodium sulphide so that when mixed in equal volumes, there is no precipitation of iron sulphide? (For iron sulphide, Ksp=6.3×10−18).
Every solution should have an x mol/L maximum concentration. Each solution's concentration will be lowered to half, or x/2, after mixing.
∴[FeSO4] = [Na2S] = x/2M
Then, [Fe2+] = [FeSO4] = x/2M
Also, [S2−]=[NasS] = x/2M
Fe(S)(x) ↔ Fe 2 + (aq) + S2−(aq)
Ksp=[Fe2+][S2−]
6.3 × 10−18=(x/2)(x/2)
x2/4=6.3 × 10−18
⇒ x = 5.02 × 10−9
If the concentrations of both solutions are equal to or less than 5.02 × 10–9M, then there will be no precipitation of iron sulphide.
⇒x =5.02 × 10−9
Na2S and FeSO4 are combined in an equal volume. Maximum concentrations of both solutions are 22, 51109M, and 5. Since Ba(OH)2 is the strongest base of the available alternatives, its pH is highest. BaCl2 is a strong base because it is the salt of Ba (OH)2. BaCl2 hydrolysis produces the most alkaline solutions and raises the PH of all the salts provided in the inquiry.
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Calculate the surface area in nm2 of a water solution contained in a Petri Dish with a diameter of 9.0 cm. The area of a circle is calculated as A = πr 2 .
The surface area of the water solution contained in a Petri dish with a diameter of 9.0 cm is approximately 6.36 × 10^16 nm^2.
What is area?In geometry, "area" is the measure of the size of a two-dimensional region or shape. It is usually measured in square units, such as square meters (m²) or square feet (ft²) and represents the amount of space that is enclosed by the boundary of the shape. The formula for calculating the area of a shape depends on its type. For example, the area of a rectangle is calculated by multiplying its length by its width, while the area of a circle is calculated by multiplying pi (approximately 3.14159) by the square of its radius. The concept of area is used in many fields, such as architecture, engineering, and physics, to determine the amount of material needed to construct or cover a surface.
According to question:
The surface area of the water solution contained in a Petri dish with a diameter of 9.0 cm can be calculated as follows:
1. First, we need to calculate the radius of the dish. The diameter is given as 9.0 cm, so the radius (r) is half of this value, which is:
r = 9.0 cm / 2 = 4.5 cm
2. Next, we need to convert the radius to nanometers (nm) since the surface area will be in nm^2. We know that 1 cm = 10,000,000 nm (1 cm = 10^7 nm), so we can convert the radius as follows:
r = 4.5 cm × 10,000,000 nm/cm = 45,000,000 nm
3. Finally, we can calculate the surface area of the water solution in the Petri dish using the formula for the area of a circle:
A = πr^2
A = π(45,000,000 nm)^2
A ≈ 6.36 × 10^16 nm^2
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Consider the pair of reactions. Draw the major organic product of each reaction, then predict the type of elimination mechanism, and compare the rates. tion, then precies the type of elimination Reaction 1: :: ethanol +:0—H product 1 :0 heat Reaction 2: :C1: +:0—H ethanol → heat product 2 Draw product 1. Draw product 2. Select Draw Rings More Erase Select Draw Rings More Erase Identify the mechanism of each reaction. Compare the rates of each reaction. O O O O Reaction 2 occurs by an El mechanism. Reaction 1 occurs by an El mechanism. Reaction 1 occurs by an E2 mechanism. Reaction 2 occurs by an E2 mechanism. O O O Reaction 1 is faster than reaction 2. Both reactions occur at the same rate. Reaction 2 is faster than reaction 1.
The expected dehydration product of 1 equiv. of a primary alcohol using H2SO4 as the dehydrating agent is an alkene. Here's the reaction and the product: CH3CH2CH2CH2OH + H2SO4 → CH3CH2CH=CH2 + H2O
The product is 1-butene.
In the E2 reaction, a proton is taken away from the carbon next to the alcohol, creating a double bond and releasing a water molecule in the process.
Organic molecules called primary alcohols have an alcohol functional group with a carbon atom that is free of any alkyl substituents. The typical formula for primary alcohols is CnH2n+1OH, where n is the number of carbon atoms in the molecule. Ethanol, methanol, propanol, and butanol are examples of main alcohols.
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Note: The correct option would be as bellow,
Primary alcohols can also dehydrate to alkenes. Unlike secondary and tertiary alcohols, the dehydration reaction occurs under an E2 elimination instead of an El mechanism, due to the instability of the primary carbocation that would be formed. Consider the reaction: CH3CH2CH2CH OH H2SO4 product Draw the expected dehydration product of 1 equiv. of a primary alcohol. Select Draw Rings More Erase C H
A reaction is occurring in a test tube. How is heat transmitted to the surroundings?.
Heat can be transmitted from a test tube to the surroundings by several different mechanisms, including conduction, convection, and radiation.
Conduction is the transfer of heat through a material, from a region of higher temperature to a region of lower temperature. In the case of a test tube, heat can be conducted through the glass walls and into the surrounding air or other materials that the test tube is in contact with.
Convection is the transfer of heat through the movement of fluids or gases. In the case of a test tube, as the contents of the test tube heat up, convection currents can be set up within the liquid or gas, which can transfer heat to the surrounding air or other materials.
Radiation is the transfer of heat through electromagnetic waves, such as infrared radiation. As the test tube and its contents heat up, they will emit some amount of infrared radiation, which can be absorbed by the surrounding air or other materials and contribute to the transfer of heat to the surroundings.
In general, the mechanism of heat transfer that dominates will depend on a variety of factors, such as the specific materials involved, the temperature difference between the test tube and the surroundings, and the rate of heating.
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How many moles of magnesium are produced when 11.2 moles of lithium react? Li(s)+MgCl 2 (aq)-->LiCl(aq)+Mg(s) (unbalanced)
According to the stoichiometry of the given chemical equation, 5.6 moles of magnesium are produced when 11.2 moles of lithium react.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
In the given chemical equation, 2 moles of lithium gives 1 mole of magnesium , thus, 11.2 moles of lithium will yield 11.2×1/2=5.6 moles.
Thus, 5.6 moles of magnesium will be produced when 11.2 moles of lithium react.
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How many liters would you need to make a 1 m solution if you have 6 mol of sodium hydroxide.
The liters would we need to make the 1 M solution if we have 6 mol of sodium hydroxide of 6 L.
The moles of the sodium hydroxide = 6 mol
The molarity of the sodium hydroxide = 1 M
The expression for the molarity is as follows :
The molarity = moles / volume in L
The volume of the sodium hydroxide = moles / molarity
The volume of the sodium hydroxide = 6 / 1
The volume of the sodium hydroxide = 6 L.
Thus the volume of the sodium hydroxide is 6L in the 1 M of the solution.
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At which of the following distances do two 10.0 kg objects have the greatest 1 point gravitational attraction on each other? 1.4 m 15.6 m 22.1 km O 3,434 km
1.4 m should be the distance between two 10.0 kg objects to have greatest 1 gravitational attraction on each other. Therefore, the correct option is option A.
What is gravitational force?
Gravity represents one of nature's most powerful forces. Isaac Newton observed that this force constituted responsible for things falling to Earth while also keeping Earth around the Sun.
He even came up with a mathematical equation for it. His gravitational formula might very well explain the planets' orbits. It worked so well that it aided in the finding of Neptune several years ago. According to the gravity formula, force becomes inversely proportional to distance, hence the distance between the two objects should be as short as possible for maximum force 1.4 m is the correct distance.
Therefore, the correct option is option A.
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Blast furnaces give off many unpleasant and unhealthy gases. If the total gas pressure is 0.99 atm, the partial pressure of carbon dioxide is 5.065 kPa, and the partial pressure of hydrogen sulfide is 015.2 mmHg, what is the partial pressure, in atmospheres, of the remaining air?
___________ atm (2 sig figs)
The partial pressure of the remaining air is 0.94 atm.
Solving for the of the remaining air, we have:First, we'll convert the partial pressure of hydrogen sulfide from mmHg to kPa:
015.2 mmHg * (101.325 kPa / 760 mmHg)
= 0.020 kPa
Next, we'll find the sum of the partial pressures of carbon dioxide and hydrogen sulfide:
5.065 kPa + 0.020 kPa
= 5.085 kPa
Now we'll convert this sum to atmospheres:
5.085 kPa * (1 atm / 101.325 kPa)
= 0.05 atm
Finally, we'll subtract this sum from the total gas pressure to find the partial pressure of the remaining air:
0.99 atm - 0.05 atm
= 0.94 atm
So the partial pressure of the remaining air is 0.94 atm (to 2 sig figs).
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Calculate the Percentage of 1) Oxygen in Calcium nitrate dihydrate.
Answer:
Percentage of Oxygen in Ca(NO3)2•2H2O
Ankit Mishra
Calculate the Percentage of 1) Oxygen in Calcium nitrate dihydrate.
Calcium nitrate dihydrate, also known as calcium nitrate (II) hydrate, has the chemical formula Ca(NO3)2•2H2O. The percentage of oxygen in calcium nitrate dihydrate can be calculated by determining the number of oxygen atoms in the formula and dividing that by the total number of atoms in the formula, then multiplying by 100 to express the answer as a percentage.
Here's the calculation:
1 calcium atom (Ca) = 40.08 g/mol
2 nitrogen atoms (N) = 14.01 g/mol
10 oxygen atoms (O) = 16.00 g/mol
So, the molar mass of Ca(NO3)2•2H2O is (40.08 + 2 x 14.01 + 10 x 16.00) g/mol = 158.08 g/mol.
The percentage of oxygen in calcium nitrate dihydrate can then be calculated as follows:
(10 x 16.00 g/mol) / 158.08 g/mol x 100% = 63.18%
So, the percentage of oxygen in calcium nitrate dihydrate is approximately 63.18%.
A toy top has a mass of 32. 0 g Cu. How many atoms Cu are in this spinning top, given that the average atomic mass of copper is 63. 55 g/mol Cu?
The spinning top has a total of 3.032 x 10^23 atoms of copper, which was calculated using its mass and the molar mass of copper.
To determine the number of atoms of copper in the spinning top, we first need to calculate the number of moles of copper present in the top using the given mass and molar mass of copper.
mass of copper = 32.0 g
molar mass of copper = 63.55 g/mol
Number of moles of copper = mass/molar mass
= 32.0 g/63.55 g/mol
= 0.5038 mol
Next, we can use Avogadro's number to convert the number of moles of copper to the number of atoms of copper:
1 mol of Cu = 6.022 x 10^23 atoms of Cu
0.5038 mol of Cu = 0.5038 mol x 6.022 x 10^23 atoms/mol
= 3.032 x 10^23 atoms
Therefore, there are 3.032 x 10^23 atoms of copper in the spinning top
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A scientist studies the effect of adding different amounts of salt on the boiling point of water. He places his results in the
graph below.
What are the independent and dependent variables in this experiment?
Mass is the independent variable, and boiling point is the dependent variable
Bowling point is the independent variable, and mass is the dependent variable
There are two independent variables and no dependent variables
There are two dependent variables and no independent variables
Answer:
Mass is the independent variable, and boiling point is the dependent variable.
Which type of formula describes the actual number of each element in a molecule or
compound?
Answer:
that's molecular
Molecular formula
It takes 505 kJ to remove one mole of electrons from the atoms at the surface of a solid metal. What is the maximum wavelength of light capable of doing this?
The maximum wavelength of light capable of removing one mole of electrons from the atoms at the surface of a solid metal is 5.08 x 10-7 m.
What is wavelength?Wavelength is a measure of the distance between two adjacent peaks of a wave, and is typically measured in meters. It is an important concept in physics and is used to describe various phenomena such as light, sound, and radio waves.
The maximum wavelength of light capable of removing one mole of electrons from the atoms at the surface of a solid metal can be calculated using the equation E = hc/λ,
where E is the energy required to remove one mole of electrons,
h is Planck’s constant (6.626 x 10-34 J·s),
c is the speed of light (3.00 x 10-8 m/s) and λ is the wavelength of light.
Substituting the given values into this equation, we get:
E = (6.626 x 10-34 J·s) (3.00 x 10-8 m/s) / λ
505 kJ = (6.626 x 10-34 J·s) (3.00 x 10-8 m/s) / λ
λ = (6.626 x 10-34 J·s) (3.00 x 10-8 m/s) / (505 x 103 J)
λ = 5.08 x 10-7 m
Therefore, the maximum wavelength of light capable of removing one mole of electrons from the atoms at the surface of a solid metal is 5.08 x 10-7 m.
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The reaction of H₂ with F2 produces HF with AH = -269 kJ/mol of HF. If the H-H and H-F bond energies are 432 and 565 kJ/mol,
respectively, what is the F-F bond energy?
H₂(g) +F₂ (g)—>2HF (g)
The F-F bond energy is 293 kJ/mol.
What is bond energy?Bond Energy also known as simply bond enthalpy, is described as a quantity that offers insight into the strength of a chemical bond.
ΔH = ∑(bond energies of bonds broken) - ∑(bond energies of bonds formed)
In this reaction above one H-H bond and one F-F bond are broken, and two H-F bonds are formed. Thus, the enthalpy change can be shown as:
ΔH = (1 × H-H bond energy) + (1 × F-F bond energy) - (2 × H-F bond energy)
Which gives us :
-269 kJ/mol = (1 × 432 kJ/mol) + (1 × F-F bond energy) - (2 × 565 kJ/mol)
Therefore, the F-F bond energy = [1 × (432 kJ/mol) + 2 × (565 kJ/mol)] - 269 kJ/mol = 293 kJ/mol
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When you measure the solubility of a solute you must use the same ___ and type of solvent at given____
Answer:
It should be temperature, concentration
What isotopes are used to determine the age of ancient objects?
Answer:
Radioactive isotope carbon-14
Explanation:
Radiocarbon dating, also known as carbon-14 dating, is a method that is commonly used to determine the age of ancient objects. This method relies on the measurement of the radioactive isotope carbon-14. Carbon-14 is formed in the upper atmosphere by the interaction of cosmic rays with nitrogen-14 atoms. It then enters the food chain and is taken up by plants and animals. Upon death, the carbon-14 in the organism begins to decay, with a half-life of approximately 5,700 years. By measuring the amount of carbon-14 remaining in an ancient object, scientists can determine how long it has been since the object died and calculate its age.
Another method for determining the age of ancient objects is uranium-lead dating, which relies on the measurement of the isotopes uranium-238 and lead-206. This method is useful for determining the age of rocks and minerals, as well as for dating the age of the Earth itself.
Answer:
Radioactive isotope carbon-14
Explanation:
