DP Physics B.3 Gas Laws

Question 1

A gas has an initial volume of 3 L at 2 atm. If the pressure changes to 1 atm, what is the new volume?

Accepted Answer

6 L

Question 2

In the ideal gas equation, what does n represent?

Accepted Answer

Number of moles

Question 3

A sample of gas at 280K with P= 9.0x104 Pa is compressed from V=240 cm3 to 60 cm3. The final temperature of the gas is?

Accepted Answer

420 K

Question 4

What causes pressure within a gas?

Accepted Answer

Movement of molecules to lower temperature

Question 5

If two gases with different molar masses have the same T and P, what can be said about their kinetic energies?

Accepted Answer

They are the same.

Question 6

Which of the following is NOT an assumption of the kinetic theory of gases?

Accepted Answer

Gas molecules have significant volume.

Question 7

What does Avogadro’s law state?

Accepted Answer

Equal volumes of gases contain equal numbers of particles.

Question 8

Estimate the Average velocity of gas particles at 300 K if the mass of one molecule is 3.0 x 10-26 kg.

Accepted Answer

640 m s-1

Question 9

What is absolute zero?

Accepted Answer

- 273 ∘C

Question 10

What is the relationship between pressure and temperature at constant volume?

Accepted Answer

Directly proportional

Question 11

Which temperature scale is used in gas law calculations?

Accepted Answer

Kelvin

Question 12

What is the temperature in Kelvin if a gas is at 25∘C?

Accepted Answer

298 K

Question 13

Which variable is held constant in Charles’s Law?

Accepted Answer

Number of moles

Question 14

What happens to the pressure of a gas if its volume is halved, assuming constant temperature?

Accepted Answer

It doubles.

Question 15

What is the unit of the universal gas constant, R, in the SI system?

Accepted Answer

J⋅mol−1⋅K−1

Question 16

If the temperature of a gas is increased while volume remains constant, what happens to the pressure?

Accepted Answer

It increases.

Question 17

If a gas expands to double its volume at constant pressure, what happens to its temperature?

Accepted Answer

It doubles.

Question 18

Which law relates pressure and temperature at constant volume?

Accepted Answer

Gay-Lussac’s Law

Question 19

What does Boyle’s Law state?

Accepted Answer

Pressure is inversely proportional to volume.

Question 20

A gas with V= 2 m³ at P= 1 atm . If the pressure increases to 2 atm with constant temperature, what is the new volume?

Accepted Answer

1 m³

Questions 20