Air and Water

Question 1

What percent of the human body is water?

Answer 1

Approx. 60%

Question 2

What is aeration?

Answer 2

When water is stirred with oxygen

Question 3

What does aeration remove and what is precipitated out?

Answer 3

Iron (III) ions, which precipitates out as Iron (III) hydroxide

Question 4

Why is chlorine added in water purification?

Answer 4

To kill and remove bacteria

Question 5

What does aluminium sulphate in sedimentation remove?

Answer 5

Clay

Question 6

What does sulphur dioxide in disinfection remove?

Answer 6

Excess chlorine

Question 7

What does carbon slurry in filtration remove?

Answer 7

Bad taste or smell

Question 8

Describe the cycle of water purification

Answer 8

Water is taken from a reservoir and filtered into the sedimentation tank. Clay is removed. Then filtration will remove the bad taste and smell. The water is passed to the clean water tank before going to the storage reservoir and then to the mains supply.

Question 9

What are detergents?

Answer 9

Substances that help clean water

Question 10

Are the tests for water reversible or irreversible actions?

Answer 10

Reversible

Question 11

What does White Anhydrous Copper (II) Sulphate turn to and is this an exo or endothermic reaction?

Answer 11

Exothermic, will change to Blue Hydrated Copper (II) Sulphate

Question 12

What does Blue Anhydrous Cobalt (II) Chloride turn to and is this an exo or endothermic reaction?

Answer 12

Exothermic, will change to Red Hydrated Cobalt (II) Chloride

Question 13

What percent of the air is nitrogen?

Answer 13

78%

Question 14

What percent of the air is oxygen?

Answer 14

21%

Question 15

What is 1% of our air made up of?

Answer 15

Mainly argon, but also pollutants like Helium, Neon and Carbon Dioxide

Question 16

What is ozone and it’s effects?

Answer 16

Ozone is formed when nitrogen oxides and volatile compounds mix in the sunlight. Causes respiratory issues, sore throats and smog.

Question 17

What are the effects of carbon monoxide and where is it from?

Answer 17

Released when fossil fuels burn. Can cause headaches and make people feel dizzy

Question 18

What is nitrogen dioxide it’s effects?

Answer 18

Comes from power plants and cars, leads to respiratory issues and contributes to acid Rain

Question 19

Where does carbon dioxide come from and what are it’s effects?

Answer 19

Comes from burning fossil fuels, leads to global warming

Question 20

How many bonds does nitrogen make?

Answer 20

3, so it is very stable

Question 21

How do you test for ammonium salts~?

Answer 21

You add sodium hydroxide solution to the salt and if ammonia ions are present ammonia gas is given off

Question 22

What is rusting?

Answer 22

The erosion of iron when in the presence of oxygen and water

Question 23

Name 2 ways of preventing rusting

Answer 23

Galvanising and greasing

Question 24

What is galvanisation?

Answer 24

When iron is coated in a thin layer of zinc - sacrificial protection