1.2: Boiling, evaporating, and condensing

When a substance changes from one state to another, its particles don’t change.

• True

• False

When a liquid becomes a gas, we call it..............

• boiling/evaporation

• melting

• sublimation

When a liquid becomes a gas the particles ............

• do not move

• move slower

• move faster

When a liquid becomes a gas the attractive forces between the particles become ........................

• very weak

• very strong

• move faster

A substance in the ...................state becomes a gas by evaporation or by boiling.

• solid

• liquid

Which picture represents boiling?

• 1

• 2

Which picture represents evaporation?

• 1

• 2

Can happen at any temperature.

• Evaporation

• Boiling

Occurs throughout the whole of a liquid when a liquid is hot enough.

• Evaporation

• Boiling

The temperature at which a substance boils is its ....................

• melting point.

• boiling point.

• freezing point.