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8E Name

End of Unit Test Higher (H) Class

Date

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

a Explain why the thermometer reading will change during the experiment.

[2 marks] secure b Explain why the limewater will change during the experiment.

[1 mark] secure c Explain why the cobalt chloride paper will change during the experiment.

[1 mark] sec d During the experiment a black powder can form on the funnel above the candle. What is this powder and why does it form?

[2 mark] adv

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e. What other product may be made if incomplete combustion happens when there is not enough oxygen. _____________________________________________________________________________ (1 Mark advanced) 2 a. Name the three sides of the ‘Fire triangle’ which shows what is needed for Fire to occur. ____________________________________________________________________________ (2 Marks secure) 2 b. What type of fire can you not put water onto? ______________________________________________________________________________ (1 mark secure)

3. The diagram shows apparatus that can be used to investigate the effect of the height of a candle on the time taken before the candle goes out.

a Candle wax is a hydrocarbon. Write a word equation for the complete combustion of candle wax.

[2 marks] secure

b Give a reason why the candle flame goes out. Explain your reason.

[1 mark] sec

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8E

End of Unit Test Higher (H)

c Identify two control variables for this experiment. For each control variable explain how it might affect the experiment and suggest how it could be controlled. i

Control variable:

[1 mark] sec How it could be controlled:

[1 mark] sec ii Control variable:

[1 mark] sec How it could be controlled:

[1 mark] sec 4

When 4.9 g of magnesium is burnt, 8.1 g of product is formed. a What is the name of the product? [1 mark] secure b Explain as fully as you can this increase in mass.

[2 marks] adv c

Complete this word equation for the reaction: Magnesium + Oxygen

________________________ [1 mark] adv

5 Sulfur dioxide and nitrogen oxides are pollutants found in the air. a Explain how these gases are produced from fossil fuels. i

sulfur dioxide

[1 mark] adv

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8E

End of Unit Test Higher (H)

ii nitrogen oxides

[1 mark] adv

b Explain how these gases cause harm.

[2 mark] adv c Suggest one way that carbon dioxide emissions could be reduced and explain why your suggestion would have this effect.

[2 mark] adv 6 The graph shows the average Arctic sea ice extent in January from 1979 to 2010.

a Describe the trend shown in the graph.

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End of Unit Test Higher (H)

b Suggest how this change can be linked to human activity. Explain your answer.

2marks] adv

Secure 15 Advanced 15

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8e end of unit test higher 2016  

8e end of unit test higher 2016  

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