8.1.5 Phase Changes

Front

What is a phase change?

Back

A phase change is a transition of matter from one state to another, such as solid to liquid or liquid to gas.

Front

What are the main states of matter?

Back

The main states of matter are solid, liquid, gas, and plasma.

Front

What happens to the energy of a substance when it changes from solid to liquid?

Back

Energy is absorbed by the substance, causing it to melt.

Front

What happens to the kinetic energy of particles during melting?

Back

The kinetic energy of particles increases as they gain energy and move more freely.

Front

What is sublimation?

Back

Sublimation is the phase change in which a solid turns directly into a gas without becoming a liquid.

Front

What is the relationship between temperature and phase changes?

Back

Temperature changes can cause phase changes by adding or removing energy from a substance.

Front

What is density?

Back

Density is the mass of a substance divided by its volume.

Front

How do you calculate density?

Back

Density = Mass / Volume.

Front

What occurs during condensation?

Back

During condensation, a gas loses energy and changes into a liquid.

Front

What is the phase change from liquid to gas called?

Back

The phase change from liquid to gas is called evaporation.