Triple Science OCR Ideas in Context for Chemistry

More help for the exam on Friday. Answer the questions. These are rough ideas of questions so they may not come up in the exam but might be useful.

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Properties of Lithium
1) A chemistry teacher wants to demonstrate the reaction of lithium, sodium and potassium in
water.
a) Describe how the lithium is stored. (1 mark)
b) The teacher first adds a small piece of lithium to water. There is some fizzing and the lithium
dissolves in the water. Write a balanced symbol equation for the reaction between lithium and
water. (3 marks)
The teacher then reacts sodium and potassium in the water. Potassium is much more reactive than
lithium. Explain why. Refer to the electron structure of the elements in your answer.

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Calculations
1) A mining company has produced 400 tonnes of lithium chloride. What mass of lithium can they
produce from this? (Relative atomic masses Li 7, Cl 35.5) (3 marks)
2) The lithium produced by electrolysis has to be converted into lithium carbonate. The formula for
lithium carbonate is Li2CO3 .…read more

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Describe the possible environmental impact of lithium chloride mining. (3 marks)
3) Widespread use of electric cars powered by lithium ion batteries would reduce air pollution in
city centres. Explain why electric cars would not reduce the overall level of carbon dioxide
emissions into the atmosphere. (2 marks)
Extraction of Lithium
4) a) Lithium metal will be extracted from molten lithium chloride by electrolysis. This is a very
energy intensive process. Explain why. (2 marks)
a) Look at the diagram above.…read more

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Li+ (l) + .......... ........... (3 marks)
c) What is produced at the other electrode? (1 mark)
d) Write an ionic equation for this reaction. (3 marks)
e) Explain why the lithium chloride has to be melted before it can be electrolysed.…read more

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