Matter (Unit 2)

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

A gas

• has a definite shape but no definite volume
• has a definite volume but no definite shape
• has fast-moving particles

Freezing

• Solid to gas

• Liquid to solid

• Gas to solid

Boiling

• liquid to gas

• gas to solid

• gas to liquid

Which state of matter has a definite shape?

• solid
• liquid
• gas

The state of matter that has no definite size or shape is

• Solid

• Liquid

• Gas

Liquid to Gas

• Condensation

• Evaporation

• Sublimation

What is the smallest unit of matter?

• atom
• element
• molecule
• compound

Pure substances are separated by...

• Chemical changes only
• Physical changes only
• Physical and Chemical changes

Two or more physically combined substances form —

• a compoud
• an acid
• an element
• a mixture