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1
Which part of the carbon cycle allows
plants to use carbon dioxide, water and
sunlight to make (food) glucose?
answer
Photosynthesis
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2 Which part of the carbon cycle involves
living organisms releasing carbon
dioxide back into the air?
answer
Respiration
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3
What is missing from the fire triangle?
answer
Heat
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4
What is missing from the fire triangle?
answer
Oxygen
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5
Give examples of pollutants released into
the atmosphere by burning hydrocarbons
answer
Oxides of Nitrogen and
Sulphur;
Carbon Monoxide;
Unburned hydrocarbons;
Lead from some petrols
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6
Give examples of how air pollutants
from burning hydrocarbons can be
reduced
answer
Removal of SULPHUR when fuels are
made
Use of CATALYTIC CONVERTORS in
cars
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7
What is BIOMASS?
answer
Plant based materials (which can be
turned into biofuels)
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8
Is ETHANOL a fossil fuel or a biofuel?
How is it produced?
answer
•Ethanol is BIOFUEL
•Made from fermentation of carbohydrates
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9
BIOGAS is a biofuel.
What is it and how is it produced?
answer
•BIOGAS is methane gas made from
anaerobic decomposition of organic waste
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10
Name a biofuel made from vegetable oil.
answer
Biodiesel
•Made from vegetable oil
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11
Give an advantage of using hydrogen as
a fuel?
answer
Hydrogen
Advantages:
RENEWABLE
ONLY produces WATER when burned.
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12
How is the renewable fuel hydrogen
produced?
answer
Hydrogen can be produced from
electrolysis of water
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13
Give an advantage of using ethanol as a
fuel?
answer
Ethanol
RENEWABLE
Carbon neutral (Doesn’t increase the
overall carbon dioxide levels in the
atmosphere).
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14
How is the renewable fuel ethanol
produced?
answer
Ethanol is produced from fermentation
of carbohydrates
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15
How is the renewable fuel ethanol
produced?
answer
Ethanol is produced from fermentation
of carbohydrates
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16
Give two major ways of releasing
carbon dioxide into the atmosphere?
answer
•Burning
•Respiration
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