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8E

End of Unit Test Standard (S)

Name

Class

Date

1 Use words from the word box to complete the sentences correctly. Not all the words will be used. burn

flames

hot

fire extinguisher

wet

wood

a To light a bonfire, you need to make the wood very

. [1 mark] entry

b We can tell when the wood starts to burn, because we can see

. [1 mark] entry

c To put the fire out, we can use a

. [1 mark] entry

d

______________ is a fuel that is burnt to release energy. [1 mark] entry

2 Draw lines to link each of the words on the left with its meaning shown on the right. combustion

a reaction in which a substance combines with oxygen

fuel

a substance that contains only hydrogen and carbon

hydrocarbon

a substance that contains stored energy that can be released during burning

oxidation

a reaction in which burning happens [4 marks] entry

3 The apparatus shown below is used to show what happens during the combustion of a hydrocarbon fuel.

During the experiment: a The thermometer will show that the temperature [1 mark] entry

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8E

End of Unit Test Standard (S)

b The blue cobalt chloride paper will turn pink because

[1 mark] secure c The limewater will turn [1 mark] secure 4 The diagram shows apparatus that can be used to investigate the effect of height of a candle on the time taken before the candle goes out.

a The list shows some variables in the experiment. size of candle i

height of block

size of container

time for candle to go out

Name the independent variable [1 mark] entry

ii

Name the dependent variable [1 mark] Entry

b The other variables need to be controlled. Explain why.

[1 mark] Entry c Choose one of the control variables and suggest how it could be controlled.

_________________________________________________________________________ [2 marks] secure

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8E

End of Unit Test Standard (S)

5 The diagram shows an incomplete fire triangle.

a What is the missing word on the triangle? [1 mark] entry b Explain what the fire triangle shows.

[1 mark] entry c How does water help to put a fire out?

[1 mark] entry d Why should you not use water on burning oil?

[1 mark] secure 6 a When magnesium metal burns in air, what product is formed?

[1 mark] sec b Write a word equation for this reaction.

[1 mark] sec c Describe what happens to the mass of reactants and products in this reaction. Explain your answer.

[2 marks] secure

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8E

End of Unit Test Standard (S)

7 Many pollutants are formed by the combustion of fossil fuels such as petrol and diesel. Two of these pollutants are carbon monoxide and carbon dioxide. a

Name one pollutant that is produced by the high temperatures inside a vehicle engine when it is burning fossil fuels.

[1 mark ]secure b Fossil fuel combustion can cause acid rain. Explain how.

[1 mark] secure c Explain how the amount of carbon monoxide released into the air from a car exhaust can be reduced.

[2 marks] secure d Explain why carbon dioxide from fossil fuel combustion is a problem.

[2 marks] secure

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8e end of unit test standard 2016  
8e end of unit test standard 2016  
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