Dartford Grammar SchoolGCSE Chemistry

Long Answer Exam Booklet

Name:____________

Class:_____________

Teacher:___________

C1 – Jan 2013 Higher

C1 – Jan 2013 Higher

C1 – Jan 2013 Higher

C2 – Jan 2013 Higher

C2 – Jan 2013 Higher

C2 = Jan 2013 Higher

C1 – June 2012 Higher

C1 –June 2012 Higher

C2 – June 2012 Higher

C2 – June 2012 Higher

C1 – Jan 2012 Higher

C1 – Jan 2012 Higher

C1 Specimen Paper

C2 Specimen Paper

C2 Specimen Paper

C3 Specimen

E-AQA Questions

C1

Q1. Most plastic bags are made from poly(ethene).

Poly(ethene) is a polymer made from ethene.

Ethene is made by cracking saturated hydrocarbons from crude oil.

(a) Use words from the box to complete the sentences about cracking.

alkanes alkenes catalyst fuel gas

Cracking involves heating the .......................................... to make a vapour.

The vapour is either passed over a hot ............................................... or mixed

with steam and heated to a very high temperature so that thermal decomposition

reactions happen.

(2)

(b) Poly(ethene) molecules are made from ethene molecules by a polymerisation reaction.

Describe what happens in a polymerisation reaction.

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(2)

(c) In this question you will be assessed on using good English, organising information clearly and using specialist terms where apropriate.

There are millions of plastic bags in use. After use most of these plastic bags are buried in landfill sites. The amount sent to landfill could be reduced if the plastic bags:

• could be reused

• could be recycled by melting and making into new plastic products

• could be burned to release energy

Use the information above and your knowledge and understanding to give the positive and negative environmental impacts of using these methods to reduce the amount of plastic bags sent to landfill.

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(Total 10 marks)

Q2. (a) For the last 200 million years the amount of carbon dioxide in the atmosphere has remained almost the same.

Describe the natural processes which remove carbon dioxide from the atmosphere.

To gain full marks in this question you should write your ideas in good English. Put them into a sensible order and use the correct scientific words.

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(4)

(b) The amount of carbon dioxide in the atmosphere has increased over the last one hundred years. Suggest two reasons why this has happened.

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(2)

(Total 6 marks)

C2

Q3. In this question you will get marks on using good English, organising information clearly and using specialist terms correctly.

Copper sulfate crystals can be made from copper oxide powder and dilute sulfuric acid.

Describe a method to make copper sulfate crystals from copper oxide and dilute sulfuric acid.

For the method you should include:

• the names of the pieces of apparatus used

• a risk assessment.

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(Total 6 marks)

Q4. Read the information in the box and then answer the question.

Aluminium is made by the electrolysis of aluminium oxide.

Aluminium oxide is an ionic compound containing aluminium ions (Al3+) and oxide ions (O2–).

The diagram below shows the apparatus used to electrolyse aluminium oxide.

(a) In this question you will get marks on using good English, organising information clearly and using specialist terms correctly.

Use information in the box and your knowledge and understanding of this process to answer this question.

Explain, as fully as you can, how aluminium and carbon dioxide are formed in this process.

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(6)

Q5. This drill contains an electric motor.

The diagram below shows the main parts of an electric motor.

The carbon contacts are made of graphite. Springs push the contacts against the copper ring.The contacts conduct electricity to the copper ring. The copper ring rotates rapidly but does not stick or become worn because the graphite is soft and slippery.

Graphite has properties which are ideal for making the contacts in an electric motor.

Explain, in terms of structure and bonding, why graphite has these properties.

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(Total 5 marks)

C3

Q6. Four labels have come off four bottles.

Describe and give the results of the chemical tests that you would do to identify which bottle contained which substance.

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(Total 5 marks)

Q7. Many hydrocarbons are used as fuels. An energy level diagram is shown for the combustion of the hydrocarbon methane.

Describe and explain why the line rises and then falls to a lower level.

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(Total 4 marks)

Q8. Ammonia is manufactured from nitrogen and hydrogen. The reaction is shown in the equation below.

The diagram shows some details of the manufacturing process.

The graph shows the percentage of reacting gases converted into ammonia at different temperatures and pressures.

At room temperature and pressure, the reaction is very slow and only a small percentage of the reacting gases is converted to ammonia.

Use the information on the diagram and graph to:

(a) describe the conditions used in the manufacture of ammonia to increase the rate of reaction.

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(4)

(b) describe and explain the conditions used in the manufacture of ammonia to increase the yield.

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(7)