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Ecosystem > Earth 2 Exam Core > Flashcards

Earth 2 Exam Core Flashcards

1
Q

Composition percentage of nitrogen?

A

78%

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2
Q

Composition percentage oxygen ?

A

21%

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3
Q

Carbon dioxide composition percentage?

A

0.03%

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4
Q

State 2 greenhouse gasses

A 
Carbon dioxide
Methane 
Ozone 
Water vapour 
Nitrous oxide 
Chlorofluorocarbons

Any of these worth 2 marks !!!

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5
Q

3 processes that effect the concentration of carbon dioxide in our atmosphere

A

Photosynthesis
Respiration
Combustion

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6
Q

Photosynthesis equation :

A

Carbon dioxide + water ~ glucose + oxygen

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7
Q

Respiration equation

A

Glucose + oxygen ~ water + carbon dioxide

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8
Q

Combustion equation

A

Fuel + oxygen ~ water + carbon dioxide

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9
Q

What is global warming?

A

Global warming is when we release greenhouse gasses into the atmosphere and increases the greenhouse effect

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10
Q

What is the greenhouse effect?

A

The greenhouse effect is responsible keeping the Earth warm at night or otherwise it causes large fluctuations in temperature

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11
Q

What are the 3 types of radiations the sun emits ?

A

Infra red
Infra violet
Light

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12
Q

State 3 consequences that happen when global warming occurs ?

A

Sea levels rising
Ice sheets and glaciers melt ( no habitat)
Rainfall,snowfall and other precipitation’s

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13
Q

How will increasing combustion affect carbon dioxide in the air ?

A

The burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide

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14
Q

What is a carbon sink?

A

Absorbs carbon and stores it or absorbs more carbon from the atmosphere than it releases

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15
Q

Identify 2 carbon sinks ?

A

The ocean has sucked up a 1/4 of the carbon dioxide that is released and since we began burning fossil fuels for energy during the industrial revolution. Phytoplankton are the main reason why

Plants absorb carbon dioxide from the atmosphere and stabilise in soil in this case souls can offset greenhouse gas emission

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16
Q

State 3 ways humans increase CO2 concentration in our atmosphere?

A

Burning more fossil fuels
Deforestation
Farming

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17
Q

3 consequences of climate change ?

A

Warming oceans
Droughts
Storms

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18
Q

Give one argument (for) and one argument (against) humans effecting climate change ?

A

For - when fossil fuels burn more CO2 is in the air

Against - CO2 levels change naturally

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19
Q

Why is it important scientist use evidence to support their ideas ?

A

So other scientists can peer asses

20
Q

How would you extract these metals ?

Sodium
Copper
Magnesium
Iron

A

Sodium - displacement
Copper - displacement/ reduction
Magnesium- electrolysis
Iron - displacement

21
Q

Complete the para:

When we use Reactions to extract metal from its When it is Reactive than .

When we use To extract a metal from its When it is Reactive. Than .

A

1) reduction, ore, less and carbon

2) reduction, electrolysis, more and carbon

22
Q

Define the term of recycling?

A

Collecting or processing used materials to be used again

23
Q

3 materials that are important to recycle

A

Tin
Gold
Phosphorus

24
Q

3 main advantages of recycling

A
  • food storage
  • less energy used and cheap
  • less plastic pollution
25
Q

2 main advantages of recycling

A
  • some products are not always recycled

- greenhouse gasses are emitted

26
Q

Arrange the words in order:

  • mine
  • metal ore
  • furnace
  • molten metal
  • aeroplane
A

1) mine
2) metal ore
3) furnace
4) molten metal
5) aeroplane

27
Q

What is the current level of carbon dioxide PPM?

A

400 PPM

28
Q

What do we generate when we burn fossil fuels ?

A

Electricity

29
Q

Give 3 statements that can be used as evidence that show humans are causing global warming ?

A

1) CO2 levels have risen hugely since 1950
2) sea levels rose 17cm in the last century
3) green house gasses such as CO2 are released when volcanoes erupt

30
Q

Why is recycling needed ?

A

To make useful products again and some resources are finite

31
Q

Metals that are extracted using carbon ?

A

Iron
Zinc
Tin
Copper

32
Q

Metals that are extracted using electrolysis

A

Sodium
Magnesium
Calcium
Aluminium

33
Q

What makes extraction by electrolysis so expensive?

A

It cost more because it’s more reactive and and it requires more electricity

34
Q

Why are electrolysis plants often situated by hydroelectric generators?

A

Hydropower plants can supply large amounts of electricity and they are easy to adjust by controlling the flow of water through the turbines

35
Q

Define finite ?

A

Finite means non renewable

36
Q

Define infinite?

A

Infinite means endless and limitless

37
Q

What’s a displacement reaction ?

A

Metal from the electrochemical series is mixed with the ions of a metal

38
Q

What if there are metals under carbon in the reactivity list ?

A

Then a displacement reaction will take place

39
Q

What if there’s a metal above carbon ?

A

Then a displacement reaction will not take place

40
Q

Works out :

1) zinc oxide + carbon
2) copper oxide + carbon
3) lead oxide + carbon
4) gold oxide + carbon
5) silver oxide + carbon

A

1) zinc + CO2
2) copper + CO2
3) lead + CO2
4) there’s no reaction
5) there’s no reaction

41
Q

What are the 2 variables ?

A

Independent and dependent

42
Q

What the dependant variable ?

A

What’s tested or measured

43
Q

What’s the independent variable ?

A

Independent is what you change in an investigation

44
Q

Define correlation ?

A

A link between two thing

45
Q

Define cause ?

A

When there’s evidence that changes in a factor definitely produced an outcome

Ecosystem (2 decks)

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