Water

Question 1

The freezing point of pure water is

Answer 1

0°C

Question 2

The boiling point is

Answer 2

100°C

Question 3

Ice is

Answer 3

Less dense than water

Question 4

Water is an excellent

Answer 4

Solvent

Question 5

The water cycle is how

Answer 5

Water is recycled on the planet

Question 6

Hard water

Answer 6

Is water that does not easily form a lather with soap

Question 7

Hardness

Answer 7

In water is caused by the presence of calcium ions dissolved in the water

Question 8

Soft water

Answer 8

Is water that forms a lather easily with soap

Question 9

Hardness can be removed by

Answer 9

Passing the water through an ion exchange resin, or by distillation

Question 10

Ion exchange resin exchanges

Answer 10

Calcium ions for hydrogen ions to remove hardness

Question 11

Electrolysis

Answer 11

Is the production of a chemical reaction by using electricity

Question 12

A Hoffmann voltmeter

Answer 12

Is used in the electrolysis of water to form H2 and O2

Question 13

Hydrogen gas forms at the

Answer 13

Negative electrode, oxygen forms at the positive electrode

Question 14

Blue cobalt chloride paper

Answer 14

Is used to test for water