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GCSE chemistry > C13 > Flashcards

C13 Flashcards

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1
Q

What was earths old atmosphere formed by

A

Volcanic activity

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2
Q

What did our old atmosphere consist of

A

C02
Nitrogen
Water

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3
Q

What happened as plants spread

A

Oxygen levels increased

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4
Q

What is the percent of CO2 in our atmosphere now

A

0.04%

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5
Q

How was co2 removed from the atmosphere

A

-Dissolving into oceans sediments
-algae and plants by photosynthesis
-

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6
Q

How much nitrogen is in the atmosphere

A

78%

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7
Q

How much oxygen is in the atmosphere

A

20%

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8
Q

Give examples of greenhouse gases

A

CO2
Methane

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9
Q

Why is their increasing amount of methane

A

More animal farming
Increased waste

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10
Q

What are some consequences of rising levels of greenhouse gases

A

Rising sea levels (ice caps)
Change in temp

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11
Q

What is a carbon footprint

A

Total amount of greenhouse gases emitted over a lifetime

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12
Q

What actions reduce carbon footprint

A

Alternative energy supplies
Plant based diets

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13
Q

What are some problems of reducing carbon footprints

A

Scientific disagreement over the causes and consequences of of climate change

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14
Q

What can Incomplete combustion of a hydrocarbon cause

A

Carbon monoxide
Soot
Particulates

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15
Q

What do most fossil fuels contain

A

Súlfur

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16
Q

What causes acid rain

A

Súlfur dioxide and nitrogen oxides

17
Q

How is súlfur dioxide made

A

Burning of súlfur compounds

18
Q

How is nitrogen oxide made

A

At high temps when fuels burn oxygen and nitrogen may form

19
Q

How was coal formed

A

Thick deposits of plant material were compressed over millions of years

20
Q

How were crude oil and natural gas formed

A

Remains of plankton deposited on the sea bed, these remains were compressed by covering rocks

21
Q

Why is there increasing amount of co2

A

-Burning of fossil fuels
-Deforestation
-Temperatures rises co2 becomes less soluble in water

22
Q

What are biofuels

A

Fuels made from plant material absorb carbon dioxide during photosynthesis and return to the atmosphere after being burnt

23
Q

What is carbon capture and storage

A

CO2 produced in power stations is pumped underground into porous rocks

24
Q

What is the equation for photosynthesis

A

Carbon dioxide + water -> glucose + oxygen

25
Q

What is the formula for methane

A

CH4

26
Q

How does súlfur cause acid rain

A

Burns in air to form súlfur dioxide
Dissolved in rain

GCSE chemistry (18 decks)

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