Classifying matter

All substances are either

• black or brown

• pure substances or mixtures

• liquids or gases

• Pizza or tea

If every sample of a substance has the exact same properties, it must be

• pure

• a mixture

If different samples have different properties, the matter must be

• pure

• a mixture

The color, melting point, boiling point, odor etc. of a substance are called

• elements

• smells

• compounds

• properties

Because the composition of a pure substance is always the same (there's only one way to be pure)

• every sample is different

• it's shiny

• the properties are always the same

• it's rare and expensive

"Composition" means

• how much of each substance is in a mixture

• a mixture is the same everywhere

• a mixture is NOT the same everywhere

• a substance transmits electricity

A mixture of two substances can have different composition, so

• the properties are always the same

• the properties are NOT always the same

Which is a mixture?

• tap water

• distilled water

A mixture that is different in different places is called

• homogeneous

• heterogeneous

Apart from the lemon slices, the tea in the pitcher is the same everywhere. It is

• homogeneous

• heterogeneous