Phase change and pressure

A gas has

• a definite volume but no definite shape.
• a definite shape but no definite volume.
• no definite shape or definite volume.
• a definite volume and a definite shape

Matter that has a definite volume but no definite shape is a

• liquid
• solid
• gas
• plasma

In which of the substances in the picture are the forces of attraction among the particles so weak that they can be ignored under ordinary conditions?

• substance A
• substance B
• substance C
• all of the above

What is the result of a force distributed over an area?

• temperature
• volume
• pressure
• mass

Collisions of helium atoms with the walls of a closed container cause

• condensation
• gas pressure
• a decrease in volume
• an overall loss of energy

Which of the following factors affects the pressure of an enclosed gas?

• temperature
• volume
• number of particles
• all of the above

The temperature and volume in a closed container of gas remain constant. If the number of particles of gas is increased, the gas pressure will

• increase
• decrease
• remain constant
• cause a decrease in the average kinetic energy of the particles

The phase change that is the reverse of condensation is

• freezing

• melting

• evaporation

• sublimation

The phase change in which a substance changes from a liquid to a gas is

• deposition
• sublimation
• condensation
• vaporization

The phase change in which a substance changes from a solid to a liquid is

• deposition
• melting
• condensation
• vaporization