C1C - Clean Air Flashcards Preview

Chemistry > C1C - Clean Air > Flashcards

Flashcards in C1C - Clean Air Deck (24):
0

How much nitrogen is in the air ?

78%

1

Is the air more rich in oxygen or nitrogen ?

Nitrogen

2

How much oxygen is there in the air ?

21%

3

1st step of atmosphere evolution is ?

Volcanos degassing making the atmosphere rich in carbon dioxide and water

4

2nd step of atmosphere evolution ?

Water vapour condensed to form oceans

5

3rd step of atmosphere evolution ?

Carbon dioxide dissolved in the ocean

6

4th step of atmosphere evolution ?

Relative increase in nitrogen because of its lack of reactivity

7

5th step in atmosphere evolution ?

The development of photosynthetic organisms

8

6th step in atmosphere evolution ?

Increase in oxygen levels because of photosynthesis

9

Why was there an increase in nitrogen ?

Due to its lack of reactivity

10

What are the uses and products of photosynthesis ?

U: carbon dioxide
P: oxygen

11

What are the uses and products of respiration ?

U: oxygen
P: carbon dioxide

12

The uses and products of combustion are the same as that of what ?

Respiration

13

A company decides to cut down many trees in a certain forest. A year later the levels of carbon dioxide have increased and the levels of oxygen have decreased in the forest! Why ?

Deforestation will produce less oxygen and more carbon dioxide because there will be a decrease in photosynthesis

14

How are the population of Britain effecting the composition of air ?

They are increasing levels of carbon dioxide and decreasing levels of oxygen because there is more people therefore more burning of fuels to power things. E.g cars

15

What is carbon monoxide ?

A poisonous gas formed by the incomplete combustion of petrol or diesel in car engines

16

Why impact do oxides of nitrogen have ?

Causes photochemical smog and acid rain

17

Where are oxides of nitrogen formed ?

In the internal combustion engine ?

18

What causes acid rain ?

Sulfur dioxide

19

Why should everyone be so bothered about acid rain ?

Kills plants & aquatic life. Erodes stonework and corrodes metals

20

How is sulfur dioxide formed ?

When sulfur impurities in fossil fuels burn

21

What does a catalytic converter do ?

Removes carbon monoxide from the exhaust gases of cars

22

What is formed when sulfur dioxide mixes with clouds ?

Dilute sulfuric acid which falls as acid rain

23

How are oxides of nitrogen made in an internal combustion engine ?

The high temperature inside the internal combustion engine allows nitrogen from the air to react with oxygen