Question 1

Question

A)As the pressure of a gas decreases to half its original value, what happens to the volume of the gas if temperature is held constant?(1 point)
Responses

The volume increases to four times its original value.
The volume increases to four times its original value.

The volume decreases to one-fourth of its original value.
The volume decreases to one-fourth of its original value.

The volume decreases to half of its original value.
The volume decreases to half of its original value.

The volume increases to twice its original value.
The volume increases to twice its original value.
Question 2
A)Which table correctly shows the relationships between volume, pressure, and temperature of an enclosed gas?(3 points)
Responses

Quantities Relationship
volume & temperature inversely proportional
pressure & volume inversely proportional
pressure & temperature directly proportional
Quantities Relationship volume & temperature inversely proportional pressure & volume inversely proportional pressure & temperature directly proportional

Quantities Relationship
volume & temperature directly proportional
pressure & volume inversely proportional
pressure & temperature directly proportional
Quantities Relationship volume & temperature directly proportional pressure & volume inversely proportional pressure & temperature directly proportional

Quantities Relationship
volume & temperature directly proportional
pressure & volume directly proportional
pressure & temperature inversely proportional
Quantities Relationship volume & temperature directly proportional pressure & volume directly proportional pressure & temperature inversely proportional

Quantities Relationship
volume & temperature inversely proportional
pressure & volume directly proportional
pressure & temperature directly proportional
Quantities Relationship volume & temperature inversely proportional pressure & volume directly proportional pressure & temperature directly proportional
Question 3
A)A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely investigating?(1 point)
Responses

Gay-Lussac’s law, by seeing how changes in temperature affect the pressure of the gas
Gay-Lussac’s law, by seeing how changes in temperature affect the pressure of the gas

Gay-Lussac’s law, by seeing how changes in temperature affect the volume of the gas
Gay-Lussac’s law, by seeing how changes in temperature affect the volume of the gas

Charles’s law, by seeing how changes in temperature affect the volume of the gas
Charles’s law, by seeing how changes in temperature affect the volume of the gas

Charles’s law, by seeing how changes in temperature affect the pressure of the gas
Charles’s law, by seeing how changes in temperature affect the pressure of the gas
Question 4
A)Which formula shows a correct representation of the combined gas law?(2 points)
Responses

V1T1P1=V2T2P2
the fraction with numerator cap v sub 1 cap t sub 1 and denominator cap p sub 1 is equal to the fraction with numerator cap v sub 2 cap t sub 2 and denominator cap p sub 2

P1V1T1=P2V2T2
the fraction with numerator cap p sub 1 and denominator cap v sub 1 cap t sub 1 is equal to the fraction with numerator cap p sub 2 and denominator cap v sub 2 cap t sub 2

V1P1T1=V2P2T2
the fraction with numerator cap v sub 1 and denominator cap p sub 1 cap t sub 1 is equal to the fraction with numerator cap v sub 2 and denominator cap p sub 2 cap t sub 2

V1P1T1=V2P2T2
the fraction with numerator cap v sub 1 cap p sub 1 and denominator cap t sub 1 is equal to the fraction with numerator cap v sub 2 cap p sub 2 and denominator cap t sub 2
Question 5
A)Which statement best describes the graph of the relationship between the volume and temperature of an enclosed gas?(2 points)
Responses

It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume.
It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume.

It is a straight line with a negative slope showing that an increase in temperature results in an increase in volume.
It is a straight line with a negative slope showing that an increase in temperature results in an increase in volume.

It is a straight line with a negative slope showing that an increase in temperature results in a decrease in volume.
It is a straight line with a negative slope showing that an increase in temperature results in a decrease in volume.

It is a straight line with a positive slope showing that an increase in temperature results in a decrease in volume.
It is a straight line with a positive slope showing that an increase in temperature results in a decrease in volume.
Question 6
A)There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?(1 point)
Responses

keeping the temperature constant and increasing the container volume
keeping the temperature constant and increasing the container volume

keeping the volume constant and cooling the container
keeping the volume constant and cooling the container

keeping the volume constant and replacing the light particles with heavy particles
keeping the volume constant and replacing the light particles with heavy particles

keeping the pressure constant and increasing the temperature
keeping the pressure constant and increasing the temperature
Question 7
A)Which observation is inconsistent with the ideal gas law?(1 point)
Responses

When volume is held constant and the temperature increases, the pressure increases.
When volume is held constant and the temperature increases, the pressure increases.

When nothing is held constant and pressure and volume both increase, the temperature increases.
When nothing is held constant and pressure and volume both increase, the temperature increases.

When temperature is held constant and volume increases, the pressure increases.
When temperature is held constant and volume increases, the pressure increases.

When pressure is held constant and volume increases, the temperature increases.
When pressure is held constant and volume increases, the temperature increases.
Question 8
A)The relationships among which variable quantities are expressed by the ideal gas law equation?(1 point)
Responses

pressure, volume, temperature, molar mass
pressure, volume, temperature, molar mass

pressure, volume, number of moles, mass
pressure, volume, number of moles, mass

pressure, volume, temperature, number of moles
pressure, volume, temperature, number of moles

volume, temperature, number of moles, gas constant
volume, temperature, number of moles, gas constant
Question 9
A)Which measure of a gas does the expression nRTP
represent?(1 point)
Responses

gas constant
gas constant

volume
volume

molar mass
molar mass

number of moles
number of moles
Question 10
A)Given R=0.0821L⋅atmmol⋅K
, what is the volume of mole of gas at a pressure of 3.12 atm and a temperature of 270K?(2 points)
Responses

86.5 L/mol
86.5 L/mol

69.2 L/mol
69.2 L/mol

22.2 L/mol
22.2 L/mol

7.10 L/mol
7.10 L/mol
Question 11
A)Given R=0.0821L⋅atmmol⋅K
, how many moles of gas are in a 1.25 L container at 300K and 2.07 atm?(2 points)
Responses

0.084 mol
0.084 mol

9.51 mol
9.51 mol

0.105 mol
0.105 mol

0.067 mol
0.067 mol
Question 12
A)A gaseous product of a reaction is collected at 280K and 0.95 atm. Given R=0.0821L⋅atmmol⋅K
, what is the molar mass of the gas, in grams per mole, if 5.49 g of gas occupies 4.92 L?(2 points)
Responses

0.04 g/mol
0.04 g/mol

133 g/mol
133 g/mol

24 g/mol
24 g/mol

27 g/mol
27 g/mol
Question 13
A)The molar volume of a gas increases by a factor of 2. Which parameter change could have caused the shift in molar volume?(1 point)
Responses

the pressure decreasing by a factor of 0.25
the pressure decreasing by a factor of 0.25

the temperature decreasing by a factor of 0.25
the temperature decreasing by a factor of 0.25

the temperature increasing by a factor of 2
the temperature increasing by a factor of 2

the pressure increasing by a factor of 2
the pressure increasing by a factor of 2
Question 14
A)When the pressure of a gas decreases, which quantity will increase, assuming all other variables are held constant?(1 point)
Responses

R
R

V
V

T
T

n
n
Question 15
A)Two balloons hold two different gases. The gases are held at the same pressure, volume, and temperature. Which quantity can differ between the two gases?(1 point)
Responses

the mass of each gas
the mass of each gas

the molar volume of each gas
the molar volume of each gas

the number of moles of each gas
the number of moles of each gas

the gas constant of each gas
the gas constant of each gas
Question 16
A)Which statement correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant?(1 point)
Responses

The relationship is directly proportional; as temperature increases, volume decreases in the same way.
The relationship is directly proportional; as temperature increases, volume decreases in the same way.

The relationship is directly proportional; as temperature increases, volume increases in the same way.
The relationship is directly proportional; as temperature increases, volume increases in the same way.

The relationship is inversely proportional; as temperature increases, volume increases in the same way.
The relationship is inversely proportional; as temperature increases, volume increases in the same way.

The relationship is inversely proportional; as temperature increases, volume decreases in the sam

Answer 1

Here are the answers to each question based on gas laws and relationships:

Question 1: A) As the pressure of a gas decreases to half its original value, what happens to the volume of the gas if the temperature is held constant?

• Answer: The volume increases to twice its original value.

Question 2: A) Which table correctly shows the relationships between volume, pressure, and temperature of an enclosed gas?

• Answer:
  • Quantities Relationship
  • volume & temperature directly proportional
  • pressure & volume inversely proportional
  • pressure & temperature directly proportional

Question 3: A) A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely investigating?

• Answer: Gay-Lussac’s law, by seeing how changes in temperature affect the pressure of the gas.

Question 4: A) Which formula shows a correct representation of the combined gas law?

• Answer: P1V1/T1 = P2V2/T2

Question 5: A) Which statement best describes the graph of the relationship between the volume and temperature of an enclosed gas?

• Answer: It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume.

Question 6: A) There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?

• Answer: keeping the pressure constant and increasing the temperature.

Question 7: A) Which observation is inconsistent with the ideal gas law?

• Answer: When temperature is held constant and volume increases, the pressure increases.

Question 8: A) The relationships among which variable quantities are expressed by the ideal gas law equation?

• Answer: pressure, volume, temperature, number of moles.

Question 9: A) Which measure of a gas does the expression nRT represent?

• Answer: number of moles.

Question 10: Given R=0.0821 L·atm/(mol·K), what is the volume of 1 mole of gas at a pressure of 3.12 atm and a temperature of 270K?

• Answer: 22.2 L/mol.

Question 11: Given R=0.0821 L·atm/(mol·K), how many moles of gas are in a 1.25 L container at 300K and 2.07 atm?

• Answer: 0.067 mol.

Question 12: A gaseous product of a reaction is collected at 280K and 0.95 atm. Given R=0.0821 L·atm/(mol·K), what is the molar mass of the gas, in grams per mole, if 5.49 g of gas occupies 4.92 L?

• Answer: 27 g/mol.

Question 13: The molar volume of a gas increases by a factor of 2. Which parameter change could have caused the shift in molar volume?

• Answer: the temperature increasing by a factor of 2.

Question 14: When the pressure of a gas decreases, which quantity will increase, assuming all other variables are held constant?

• Answer: V.

Question 15: Two balloons hold two different gases. The gases are held at the same pressure, volume, and temperature. Which quantity can differ between the two gases?

• Answer: the mass of each gas.

Question 16: Which statement correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant?

• Answer: The relationship is directly proportional; as temperature increases, volume increases in the same way.

These answers reflect the fundamental principles of gas laws as described by Boyle's Law, Charles's Law, and the Ideal Gas Law.