Year 7 Pre-Test Term 4

Can you tell, just by looking, whether a mixture in water is a solution or a suspension?

• YES

• NO

Identify which of the following substances is a mixture.

• Silver

• Distilled water

• Smoke

• Nitrogen gas

A water sample taken from a river that shows a brown colour is most likely to be:

• a) a solution.

• a colloid.

• a suspension.

• an emulsion.

A separating funnel works when two substances have different:

• melting points.

• colours.

• densities.

• solubilities.

Which of the following methods is most suitable for separating a mixture of dissolved solid and water?

• a) Filtration

• Crystallisation

• Sublimation

• Simple Distillation

To separate mud from muddy water we can use filtration. The mud collected in the filter paper is known as _______.

• a) Filtrate

• Residue

• Crystals

• Mixture

Which of the following statement is true?

• During distillation, water vapourises and changes into steam.

• During distillation, in the condenser, water evaporates.

• During distillation, hot water is used to run along the condenser.

• During distillation, the thermometer is not necessary.

Which one of the following pairs of separation techniques will BOTH separate sand from a mixture of salt and water.

• Decanting and distillation

• Distillation and evaporation

• Decanting and filtration

• Chromatography and evaporation

Black instant coffee is a mixture of coffee powder and hot water. Which substance is the solute:

• water

• coffee powder

• finished coffee solution

Black instant coffee is a mixture of coffee powder and hot water. Which substance is the solvent:

• coffee powder

• coffee solution

• hot water