Year 7 Mixtures

1.

1 point

The main component of sewage is

water

food

body waste

detergent

2.

1 point

Inks can be separated into their coloured components by:

filtration

distillation

chromatography

crystallization

3.

1 point

What two processes are involved in obtaining pure water from a sugar solution?

Evaporation and condensation

Evaporation and decanting

Crystallization and evaporation

Condensation and crystallization

4.

1 point

Which of the following substances is not found in a bottle of lemonade?

carbon dioxide

sugar

oxygen

water

5.

1 point

Which of the following is a correct statement about how a filter works?

Solids may be forced through filter paper, leaving a liquid in the folded paper cone

Only gases can pass through a filter

A filter will separate all dissolved solids from the liquid

Particles which are too big are trapped by the filter.

6.

1 point

Identify a mixture that is commonly separated by centrifugation.

alcohol

town water

salt water

blood

7.

1 point

Stuart is vacuuming the carpeted areas of his house. The filtrate (the substance that passes through the filter) is the

dust

vacuum cleaner

carpet

air

8.

1 point

In a sample of soda water:

the carbon dioxide is the solute

the carbon dioxide is the solvent

the water is the solution

the soda water is the solvent

9.

1 point

Decanting is:

tipping the liquid in one beaker into another, leaving some solid in the bottom of the first beaker.

pouring the entire contents of one beaker into another more conveniently sized beaker.

tipping a liquid into a filter paper sitting in another beaker.

pouring liquid from a beaker or flask down the sink.

10.

1 point

Which one of the following is incorrect? An insoluble substance may:

form a solution

form a sediment

form a suspension

float on top of a liquid

11.

1 point

Particles which are too big are trapped by the filter.

Only gases can pass through a filter

Particles which are too big are trapped by the filter

a filter will separate all dissolved solids from the liquid

Solids may be forced through filter paper, leaving a liquid in the folded paper cone

12.

1 point

What is the name of the process used by cooks to separate large grains from small flour particles?

Sieving

Filtration

Sedimentation

Gravity separation

13.

1 point

Which of the following is a key piece of distillation equipment?

Centrifuge

Condenser

Separating funnel

Magnet

14.

1 point

Why is water considered to be an important solvent?

Water dissolves the chemicals needed by both plant and animal cells.

Water is a colourless liquid.

Water occurs in large quantities on Earth.

Water is useful for cleaning clothes and washing kitchen utensils.

15.

1 point

A solid which dissolves in another substance is called a:

Sediment

Solute

Solvent

Solution

16.

1 point

Clumps of small particles that sink to the bottom of a sample of water during the purification process are called:

alum

molecules

floc

atoms

17.

1 point

Which mixture could be separated using magnetic attraction?

Iron filings and paperclips

Sand and sulfur

Iron filings and sulfur

Nails and paperclips