Physical Science S2 Exam 21-22

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

A gas

• has a definite shape but no definite volume
• has a definite volume but no definite shape
• has fast-moving particles

Freezing

• Solid to gas
• Liquid to solid
• Gas to solid
• Liquid to gas

Boiling

• liquid to gas
• gas to solid
• gas to liquid
• solid to liquid

Which state of matter has tightly packed molecules?

• solid
• liquid
• gas

What is happening when my ice cream changes from a solid to a liquid?

• freezing
• melting
• burning
• evaporation

The state of matter that has no definite size or shape is

• Solid
• Liquid
• Gas

Particles of a liquid

• are tightly packed together and stay in a fixed position.
• have no viscosity.
• decrease in volume with increasing temperature.
• are free to move around one another but still touch.

The speed of the molecules determines the _____.

• volume
• density
• pressure
• temperature

The slower the particles in a substance move,

• the colder it is.
• the warmer it is.
• the more energy it has.
• the less energy it has.