cleaning dirty water

Question 1

what is sedimentation?

Answer 1

collecting water

Question 2

what is chlorination?

Answer 2

bacteria and other microbes being killed

Question 3

a student is given solid wax - they want to convert it to liquid

what two equipments should they use?

Answer 3

bunsen burner and test tube

Question 4

some liquid is left in a room. after a few days the liquid cant be seen

what is the process that occurred?

Answer 4

evaporation

Question 5

describe the movement of how water particles change when water is cooled from 10° to -10°

Answer 5

molecules become closer, slow down, and lose energy

Question 6

what should we do if we have a mixture of sand and salt, but only want the sand?

Answer 6

add water, stir, then use filtration

Question 7

what should we do if we have a mixture of sand and salt, but only want the salt?

Answer 7

add water, stir, then use filtration to get rid of the sand; then use evaporation to drive off the water.

Question 8

what should we do if we want to know if the ink in a felt-tip pen is a mixture of colours?

Answer 8

chromatography

Question 9

what should we do if we have a solution of copper sulphate, but only want the copper sulphate crystals?

Answer 9

crystallisation

Question 10

what should we do if we have salty water, but only want the salt?

Answer 10

evaporation

Question 11

what should we do if we have salty water, but only want the pure water?

Answer 11

simple distillation