AnswersBCHS KY-Chemistry Section ASolids and Plasmas

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Which best defines partial pressure in a mixture of gases?

A
pressure that is exerted by all the gases of a mixture on the container
B
pressure that is exerted by one gas as if it occupied a container by itself
C
half of the pressure that is exerted by the gases of a mixture on the container
D
sum of the individual pressures that are exerted by two or more gases
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The incomplete table below shows a comparison of the different gas laws.NameVariablesConstantsEquationBoyle's law pressure, volume? Charles’s lawvolume, temperature??temperature, pressurevolume, moles of gas?pressure, temperature, volume?What is assumed to be constant when using the combined gas law?

Question illustration
A
pressure
B
number of moles
C
volume and moles of gas
D
pressure and temperature
3

Which statement can best be concluded from the ideal gas law?

A
The product of pressure and volume of an ideal gas is proportional to the absolute temperature.
B
All collisions between atoms or molecules are perfectly elastic and are not the result of any attractive forces.
C
The temperature, pressure, and volume of a gas are all related.
D
The behavior of a gas under real conditions does not obey the ideal gas law.
4

Avogadro’s number was calculated by determining the number of atoms in

A
12.00 g of carbon-12.
B
14.00 g of carbon-12.
C
12.00 g of oxygen.
D
14.00 g of oxygen.
5

Which describes the volume of 1 mol of gas at standard temperature and pressure?

A
The volume is greater for a larger mass of gas.
B
The volume is the same for any gas.
C
The volume depends on the size of the container.
D
The volume varies with the pressure.
6

Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO?

A
the mass
B
the volume
C
the number of molecules
D
the number of oxygen atoms
7

If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what would happen to the pressure of the gas?

A
It would increase.
B
It would be halved.
C
It would stay the same.
D
It would slightly decrease.
8

The gas in the piston is at constant temperature. A student increases the pressure on the piston from 2 atm to 3 atm.Which gas law would a student use to investigate this situation?

Question illustration
A
Boyle’s law
B
Charles’s law
C
Gay-Lussac’s law
D
ideal gas law
9

If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law?

A
the molar amount of the gas
B
the partial pressure of the gas
C
the standard temperature and pressure
D
the molar mass
10

The volume of a gas is 0.450 L when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L?Use .

Question illustration
A
0.225 atm
B
0.444 atm
C
2.25 atm
D
4.44 atm
11

What is the molar mass of fluorine, F2?

A
9.00 g/mol
B
18.00 g/mol
C
19.00 g/mol
D
38.00 g/mol
12

Which statement best describes a mole?

A
It is used mainly for writing chemical formulas.
B
It is used for chemical equations that have reversible reactions.
C
It is used for directly comparing the amounts of substances.
D
It is used mainly for dealing with fluid substances.
13

Which equation represents the combined gas law?

A
P subscript 1 V subscript 1 equals P subscript 2 V subscript 2.
Option A
B
StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction.
Option B
C
StartFraction P subscript 1 V subscript 1 over T subscript 1 EndFraction equals StartFraction P subscript 2 V subscript 2 over T subscript 2 EndFraction.
Option C
D
P subscript 1 V subscript 1 T subscript 1 equals P subscript 2 V subscript 2 T subscript 2.
Option D
14

How are a mole and a dozen similar?

A
Each represents a certain mass of material.
B
Each names a given number of objects.
C
Each identifies a specific volume.
D
Each measures a given number of amus.
15

A container holds 6.4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.24 atm. What is the partial pressure of hydrogen?Use .

Question illustration
A
0.31 atm
B
0.93 atm
C
5.2 atm
D
31 atm
16

Which law relates temperature, pressure, volume, and the number of moles of a gas under perfect conditions?

A
Boyle’s law
B
Charles’s law
C
ideal gas law
D
combined gas law
17

What is the molar mass of CHCl3?

A
48.47 g/mol
B
83.92 g/mol
C
119.37 g/mol
D
121.39 g/mol
18

Consider the equation below.Na+ + Cl– NaClWhich statement best describes the relationship between the substances in the equation?

Question illustration
A
The number of sodium ions is equal to the number of formula units of salt.
B
The number of sodium ions is less than the number of chloride ions.
C
The number of chloride ions is less than the number of formula units of salt.
D
The number of sodium ions is two times the number of formula units of salt.
19

The absolute temperature of a gas is increased four times while maintaining a constant volume. What happens to the pressure of the gas?

A
It decreases by a factor of four.
B
It increases by a factor of four.
C
It decreases by a factor of eight.
D
It increases by a factor of eight.
20

What is the molar mass of a substance?

A
the mass in grams of one mole of a substance
B
the number of particles in one gram of a substance
C
the number of moles in one gram of a substance
D
the mass in grams of one particle of a substance

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