Matter

Water is a pure substance made up of...

• hydrogen and oxygen.

• hydrogen and helium.

• oxygen and helium.

Solutions are...

• pure substances.

• heterogeneous mixtures.

• homogeneous mixtures.

Solids can be separated from liquids by...

• filtration and distillation.

• filtration and evaporation.

• filtration and decantation.

Distillation and decantation can be used to separate mixtures of...

• solids and liquids.

• solids.

• liquids.

Physical changes include changes to the...

• size, shape, colour or atoms of matter.

• size, shape, colour or state of matter.

• size, shape, colour or composition of matter.

Cooling can cause the following changes of state:

• condensation, solidification and reverse sublimation.

• condensation, solidification and sublimation.

• condensation, vaporization and reverse sublimation.

The melting point is the temperature at which...

• a liquid changes into a solid.

• a liquid changes into a gas.

• a solid changes into a liquid.

Chemical reactions always produce...

• gas.

• heat.

• new substances.

Rust is a result of...

• oxidation.

• combustion.

• fermentation.

Two or more indistinguishable components.

... mixture.