8 E
Quick Quiz
On your answer sheet, write in or circle the correct letter for each question.
8Ea B The mass of products is greater than
the mass of reactants.
1 Combustion is a scientific word for:
A exploding B burning
C evaporating D getting hotter
2 A fuel is:
A a substance formed from living
organisms that lived a long time ago
B a substance that explodes
C a substance that contains
hydrocarbons
D a substance that transfers energy
usefully, usually by heating.
3 When hydrogen reacts with oxygen, the
product is:
A water B oxide
C carbon dioxide D hydrogen
4 The products of combustion of a
hydrocarbon are:
A hydrogen + oxygen
B carbon dioxide + water
C carbon dioxide + hydrogen
D carbon + water
8Eb
1 Oxidation is always:
A a reaction in which a substance
combines with oxygen.
B a reaction in which a substance burns
in oxygen.
C a reaction in which a substance burns
in air.
D an explosive reaction.
2 When zinc burns in oxygen it forms:
A water B zinc
hydroxide
C zinc carbonate D zinc oxide
3 During a chemical reaction, reactants form
products. Compare the mass of reactants
with the mass of products formed.
A The mass of reactants is greater than
the mass of products.
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8
C The mass of products is the same as
E
Quick Quiz
the mass of reactants.
D The change in mass depends on what
the reactants and products are.
4 When 4.8 g of magnesium reacts with 3.2 g
of oxygen, how much magnesium oxide is
formed?
A 1.6 g B 4.9 g
C 7.0 g D 8.0 g
8Ec
1 The three sides of a fire triangle are:
A fire, water, heat B heat, water,
fuel
C heat, oxygen, D fire, oxygen,
fuel fuel
2 What does this hazard symbol warn of?
A The substance is explosive.
B The substance burns easily.
C The substance supplies oxygen to fires.
D The substance puts out fires.
3 What happens in an exothermic reaction?
A Energy is released that increases the
temperature of the surroundings.
B Energy is taken in from the
surroundings, reducing the
temperature.
C The reacting substances always
explode.
D You need to heat a substance or
substances to get a reaction to occur.
4 The best way to put out a small electrical
fire is:
A spray it with water to cool it down.
B spray with foam to exclude air and cool
it down.
C cover with a wet cloth to exclude air
and cool it down.
D spray with a powder extinguisher to
exclude air.
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8Ed 8Ee
1 Name two pollutants that may be formed 1 What does global warming mean?
when fossil fuels are burnt in a vehicle A The warming effect of the Sun on the
engine. Earth.
A carbon dioxide and sulfur B The natural warming effect caused by
B sulfur dioxide and water greenhouse gases in the atmosphere.
C nitrogen oxides and sulfur C The additional warming effect caused
by increasing amounts of carbon
D nitrogen oxides and sulfur dioxide dioxide in the air.
2 Why are carbon monoxide and soot D The way the climate is changing as a
particles found in the exhaust gases of result of more carbon dioxide in the air.
vehicles?
2 Which of these factors caused the Earth’s
A These substances are in the fuel used surface temperature to vary thousands of
in the vehicle. years ago?
B The fuel reacts completely with oxygen A release of carbon dioxide by burning
in the air. fossil fuels
C The fuel does not react fully with B variation in the energy emitted by the
oxygen in the air. Sun
D These substances are formed from C variation in the number of vehicles on
impurities in the fuel. Earth
3 How do sulfur dioxide and nitrogen oxides D variation in ice ages
help cause acid rain?
3 Which description explains how carbon
A These acidic gases dissolve in water dioxide helps to cause the greenhouse
droplets in clouds. effect?
B These alkaline gases react with water A It blocks energy from the Sun from
droplets in clouds. reaching the Earth’s surface.
C They make rain happen more easily. B It absorbs energy emitted from the
Earth’s surface and re-emits it out into
D The gases react together forming space.
sulfonitroxidic acid in clouds.
C It absorbs energy emitted from the
4 How does a catalytic converter help to Earth’s surface so that it doesn’t get
reduce pollution from burning fossil fuels? any warmer.
A It filters out soot particles from the D It absorbs energy emitted from the
gases formed. Earth’s surface and re-emits it back to
B It changes pollutant gases into less the surface.
harmful gases. 4 Which of these methods would not help to
C It absorbs sulfur dioxide so that it isn’t reduce the amount of carbon dioxide
released into the air. released each year?
D It reacts with the pollutants to form a A Changing from fossil fuel power
solid, which has to be scraped out of stations to nuclear power stations.
the converter at regular intervals. B Fitting catalytic converters to all
vehicles.
C Setting government targets for carbon
dioxide production and fines for
industries that exceed their target.
D Travelling by bus or train rather than by
car.
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