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Chemistry > C1c-clean Air > Flashcards

C1c-clean Air Flashcards

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1
Q

What is the percentage of nitrogen in the air?

A

78%

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2
Q

What is the percentage of carbon dioxide in the air?

A

0.035%

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3
Q

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

A

Add carbon dioxide into air

Remove oxygen

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4
Q

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

A

Removes carbon dioxide

Adds oxygen

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5
Q

What is the percentage of oxygen in the air?

A

21%

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6
Q

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

A

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

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7
Q

What effect does deforestation have on the composition of air?

A

More people more land for houses and food

Deforestation, less plants, less CO2 taken out

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8
Q

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

A
  • 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
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9
Q

What is carbon monoxide?

A

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

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10
Q

What does oxides of nitrogen cause?

A

Photochemical smog
Acid rain
Formed in the internal combustion engine

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11
Q

What does sulfur dioxide cause?

A

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

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12
Q

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

A

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

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13
Q

What does a catalytic converter do?

A

Removes carbon monoxide from the exhaust gases of a car

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14
Q

Why is it important for atmospheric pollution to be controlled?

A

Pollutants make life unhealthy and miserable

Respiratory illnesses increase

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15
Q

What is the balanced symbol equation for a catalytic converter?

A

2CO + 2NO –> N2 + 2CO2

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Chemistry (35 decks)

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