True or false:

When a solid changes state to a liquid, it is said to freeze.

At what temperature in Celsius does water molecule freeze?

At what temperature in Celsius does water molecule melt?

The particles that make up a substance in its liquid state have _____ kinetic energy than those of the same substance in its solid state.

Explain why this statement is false:

All substance melts and freezes at 0 degree Celsius.

For a solid to melt, energy must be __________ the system.

For a liquid to freeze, energy must be _________ the system.

What happens to the movement of particles when the energy is added?

If you leave a cup of water in your room for a week, the liquid eventually turns into gas. What process has occurred?

You turned on the stove to boil water to prepare for a hot cup of tea. Accidentally you left it for too long and all the water has turned into gas. What process has occurred?

Due to what process do water droplets appear on the outside of a cold glass of iced tea?

Have you played with an dry ice before? It's a frozen carbon dioxide (not water!) that turns into gas. What is this process called?

What do you call the process when a gas turns directly into a solid?

At what temperature in Celsius does water boil?

Frost is an example of ____________ because the water vapor in the air turns directly into ice.

True or false:

A gas molecule contains more kinetic energy than a liquid molecule.

Thermal energy is removed from the system to change a gas to a liquid. What is this process called?

Thermal energy is added to a solid to become a _______.

Heat always transfers from ___________.

For a solid to freeze, energy must be _______ the system.

True or false:

Evaporation can occur at temperatures below the boiling point.