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Flashcards in C1c-clean Air Deck (15)
1

What is the percentage of nitrogen in the air?

78%

2

What is the percentage of carbon dioxide in the air?

0.035%

3

How do respiration, combustion and decay effect the levels of oxygen and carbon dioxide in the air?

Add carbon dioxide into air
Remove oxygen

4

How does photosynthesis effect the levels of oxygen and carbon dioxide in the air?

Removes carbon dioxide
Adds oxygen

5

What is the percentage of oxygen in the air?

21%

6

What effect does the population have on the composition of air?

Population increasing means
More respiration more CO2
Increasing energy demand increase in burning fossil fuels more CO2

7

What effect does deforestation have on the composition of air?

More people more land for houses and food
Deforestation, less plants, less CO2 taken out

8

How did the present day atmosphere evolve over millions of years?

-Degassing of early volcanoes producing an atmosphere rich in water and carbon dioxide
-Condensing of water vapour to form oceans
-dissolving of carbon dioxide in ocean waters
-relative increase of nitrogen due to its lack of reactivity
-development of photosynthetic organisms
-increase in oxygen levels due to photosynthesis

9

What is carbon monoxide?

A poisonous gas formed by the incomplete combustion of petrol or diesel in car engines
Stops haemoglobin
carrying oxygen around body

10

What does oxides of nitrogen cause?

Photochemical smog
Acid rain
Formed in the internal combustion engine

11

What does sulfur dioxide cause?

Acid rain kills plants, aquatic life
Erode stonework
Corrode metals
Formed when sulphur impurities in fossil fuels burn

12

Why does the temperature inside an internal combustion engine allow oxides of nitrogen to be made?

Nitrogen oxides are created from a reaction between the nitrogen in the air and oxygen caused by high temperature

13

What does a catalytic converter do?

Removes carbon monoxide from the exhaust gases of a car

14

Why is it important for atmospheric pollution to be controlled?

Pollutants make life unhealthy and miserable
Respiratory illnesses increase

15

What is the balanced symbol equation for a catalytic converter?

2CO + 2NO --> N2 + 2CO2