1.6 Changes of state-melting and freezing

What is the change of state from solid to liquid called?

• Evaporation

• Melting

• Condensation

• Sublimation

What happens to the particles when a solid begins to melt?

• They stop moving

• They move out of their fixed positions

• They become smaller

• They disappear

What is the temperature at which a substance melts called?

• Condensation point

• Boiling point

• Freezing point

• Melting point

What happens to the particles when a liquid freezes?

• They start moving.

• They become smaller.

• They arrange themselves in a pattern.

• They move faster.

What is true for all changes of state?

• Total number of particles are increased or decreased.

• Particles move at the same speed.

• Particles themselves change.

• Particles do not change.

When a solid melts Its particles ........................ energy.

• lose

• gain

When a solid melts the particles overcome the attraction force and start to move around, in and out of each other.

• True

• False

Every substance has its own melting point.

• True

• False

Melting points are used to Identify substances.

• True

• False

The change of state from liquid to solid is called ...............

• melting

• freezing

• boiling