Mixtures

Question 1

Name 5 physical methods of separating mixtures

Answer 1

Question 2

Tell me about evaporation and what equipment you need

Answer 2

This and the tripod, gauze, beaker, and evaporating mat

Question 3

How would you separate rock salt?

Answer 3

Question 4

Ciara has tried to make rock salt into pure salt but burned her hair and scalded her hands. What can she do to ensure safety next time?

Answer 4

She should wear goggle and stay back to protect herself from the spitting. She should also tie back long hair.
Use heatproof mat

Question 5

You are separating rock salt via Filtration and Evaporation. Name the four steps needed to achieve this.

Answer 5

1. Grinding
2. Dissolving
3. Filtering
4. Evaporating

Question 6

What can chromatography be used for?

Answer 6

Chromatography is a separation technique used to separate mixtures of soluble substances.
These are often coloured substances such as food colourings, inks, dyes or plant pigments.

Question 7

What’s the name of the piece of paper showing the results after chromatography has occurred?

Answer 7

Chromatograms
can be used to match known pigments with those in a mixture.
On a chromatogram, one spot means that the substance is pure. An impure substance produces two or more spots.

Question 8

What is distillation?

Answer 8

Question 9

Here is a picture of a chromatogram

Answer 9

Question 10

What two processes occur in the water cycle to turn sea water into rain water?

Answer 10

Evaporation and condensation.

Water evaporates from the surface of the sea. The salt gets left behind in the sea. Then, the water vapour in the clouds cools and condenses to form rain.

Question 11

What is the name of the piece of apparatus that cools down the hot gas after the mixture has been heated?

Answer 11

Condenser.

Question 12

Name me the apparatus used in distillation

Answer 12

Question 13

Water and ethanol can be separated using

Answer 13

distillation

Question 14

If the boiling points of the mixture are very close, what method would you use to separate the mixture of liquids?

Answer 14

Fractional distillation can be used if the boiling points of two mixed liquids are similar. In these cases, the boiling points would be too close for simple distillation

Question 15

What is the equation for calculation solubility?

Answer 15

Mass of solute in solution ÷ mass of solvent in solution