Air and Water 🌊💨

Question 1

What are uses oxygen

Answer 1

Oxygen is used in steel making , welding and breathing

Question 2

Uses of nitrogen

Answer 2

Food packaging , production of ammonia and silicon chips

Question 3

What are these gases separated from air by

Answer 3

Fractional distillation

Question 4

Fractional distillation of air instructions

Answer 4

1. Air is filtered to remove dust and then it is cooled
2. Water is now in the liquid state
3. Water vapor + carbon dioxide freeze and are removed using absorbent filters
4. Noble gases still at gaseous state
5. The liquid mixture is passed into the bottom of a fractionating column
6. Oxygen liquifies at 183 and Nitrogen - 196
7. Nitrogen vaporizes first and is collected as it rises in the gaseous state
8. Liquid O2 is removed from bottom of column

Question 5

What substances pollute the air

Answer 5

Carbon monoxide , sulphuric dioxide ,oxides of nitrogen ,compounds of lead

Question 6

What are sources of carbon monoxide and the effects

Answer 6

Sources : incomplete combustion of fuels

Effect : poisonous

Question 7

What are sources of sulfur dioxide and effects

Answer 7

Sources : combustion of fuels , natural gas and sulfide ores
Effects : acid rain which causes corruption to melt structures buildings etc
Also pollutes crops and water

Question 8

Sources and effects of oxides of nitrogen

Answer 8

Sources : car engines

Effects : acid rain , breathing difficulties

Question 9

Compounds of lead sources and effects

Answer 9

Sources: old water pipes , petrol

Effects : damage to nervous system

Question 10

What is a chemical test For water

Answer 10

Cobalt (ii) chloride turns blue to pink on the addition of water . It done using cobalt chloride paper.

Anhydrous copper (iii) sulfate turns white to blue on the addition of water

Question 11

What is filtration

Answer 11

• filtration process used to remove large insoluble particles by passing the water through filters that trap larger particles

Question 12

What are measures taken to treat water

Answer 12

Filtration. And chlorination

Question 13

What is chlorination

Answer 13

Involves the careful addition of chlorine to the water which kills bacteria and other unwanted micro organisms

Question 14

Photosynthesis equation

Answer 14

Carbon dioxide + water + energy from light produces glucose and oxygen.

6CO2 + 6H20 + (energy) → C6H12O6 + 6O2

Question 15

Respiration equation

Answer 15

Respiration : glucose + oxygen -> carbon + water + energy

Question 16

What is the structure of the atmosphere

Answer 16

Troposphere
Stratosphere
Mesosphere
Thermosphere

Question 17

Composition of the atmosphere

Answer 17

Nitrogen  : 78%
Oxygen : 20 %
Argon : 0.93%
Carbon dioxide : 0.04 % 
Neon : 0.02%
Helium 
Krypton

Question 18

What is the composition of the atmosphere affected by

Answer 18

Respiration
Photosynthesis
Volcanic activity
Radio active decay

Question 19

What do greenhouse gases do

Answer 19

They absorb heat and radiation

Question 20

What is the greenhouse Effect

Answer 20

A process that occurs when gases in Earths atmosphere trap the suns heat

Question 21

Effects of greenhouse gases

Answer 21

Climate change
Water levels rises
Migration of species
Spread of disease