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Chemistry > C1C - Clean Air > Flashcards

C1C - Clean Air Flashcards

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0
Q

Is the air more rich in oxygen or nitrogen ?

A

Nitrogen

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1
Q

How much nitrogen is in the air ?

A

78%

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2
Q

How much oxygen is there in the air ?

A

21%

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3
Q

1st step of atmosphere evolution is ?

A

Volcanos degassing making the atmosphere rich in carbon dioxide and water

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4
Q

2nd step of atmosphere evolution ?

A

Water vapour condensed to form oceans

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5
Q

3rd step of atmosphere evolution ?

A

Carbon dioxide dissolved in the ocean

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6
Q

4th step of atmosphere evolution ?

A

Relative increase in nitrogen because of its lack of reactivity

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7
Q

5th step in atmosphere evolution ?

A

The development of photosynthetic organisms

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8
Q

6th step in atmosphere evolution ?

A

Increase in oxygen levels because of photosynthesis

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9
Q

Why was there an increase in nitrogen ?

A

Due to its lack of reactivity

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10
Q

What are the uses and products of photosynthesis ?

A

U: carbon dioxide
P: oxygen

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11
Q

What are the uses and products of respiration ?

A

U: oxygen
P: carbon dioxide

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12
Q

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

A

Respiration

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13
Q

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 ?

A

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

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14
Q

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

A

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

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15
Q

What is carbon monoxide ?

A

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

16
Q

Why impact do oxides of nitrogen have ?

A

Causes photochemical smog and acid rain

17
Q

Where are oxides of nitrogen formed ?

A

In the internal combustion engine ?

18
Q

What causes acid rain ?

A

Sulfur dioxide

19
Q

Why should everyone be so bothered about acid rain ?

A

Kills plants & aquatic life. Erodes stonework and corrodes metals

20
Q

How is sulfur dioxide formed ?

A

When sulfur impurities in fossil fuels burn

21
Q

What does a catalytic converter do ?

A

Removes carbon monoxide from the exhaust gases of cars

22
Q

What is formed when sulfur dioxide mixes with clouds ?

A

Dilute sulfuric acid which falls as acid rain

23
Q

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

A

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

Chemistry (17 decks)

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