Changes of Matter

Draw the particles of a solid.

Answer explanation

The particles in a solid are tightly packed together and vibrate in place.

Draw the particles of a liquid.

Answer explanation

The particles in a liquid are in contact with each other but can move around freely.

Draw the particles of a gas.

Answer explanation

The particles in a gas are very spaced out. They move around very quickly and in opposite directions.

What type of phase change occurrs when a gas turns into a liquid?

• boiling

• condensation

• freezing

Answer explanation

when a gas cools, the particles slows down and condense together creating a liquid.

What type of phase change occurs when a liquid turns into a gas?

• condensation

• melting

• vaporization

What type of phase change occurs when a liquid turns into a solid?

• freezing

• melting

• deposition

What happens to thermal energy during melting?

• Thermal energy increases

• Thermal energy decreases

• Thermal energy remains the same.

What happens to thermal energy during condensation?

• Thermal energy increase.

• Thermal energy decrease.

• Thermal energy remains the same

A gas changing into a solid is called

A solid changing into a gas is called