# Quiz | Properties of Gases

1

Which of the following statements is incorrect?

Gases are always miscible with each other

Gases exert pressure on the walls of any container

Gas volume changes with pressure but not with temperature

Gases have relatively low densities

Gas volume changes significantly with pressure AND temperature

2

Which of the following relationships is a correct statement of Gay-Lussac’s law?

P/T = constant

V/T = constant

PT = constant

PV = constant

At constant volume: P and T are directly proportional ⇒   = cste

3

What is the units of pressure and volume in the ideal-gas equation?

Bar and L

Pa and L

Pa and m3

Atm and m3

In the ideal-gas equation, the pressure is in Pa and the volume in m3

4

For an ideal gas, which pair of variables are inversely proportional to each other?

P and T

P and V

V and T

n and V

Ideal-gas equation: PV = nRT ⇒ If P increases, V decreases and vice versa (P and V are inversely proportional to each other)

5

Under what conditions does a real gas come closest to the behavior of an ideal gas?

Low P and T

High P and T

High P and low T

Low P and high T

Better conditions for a gas to behave like an ideal gas: monoatomic gas, low pressure, high temperature

6

Which of the following statements is not consistent with the kinetic-molecular theory of gases?

The gas consists mostly of empty space

The collisions between the gas particles are elastic

There are interactions between the molecules in a gas: they repel or attract one another

The mean kinetic energy of the molecules in a gas is proportional to the temperature

In the kinetic theory of gases, the molecules exert no attractive or repulsive forces on each other except during collisions ⇒ between collisions they move in straight lines