Using Resources: Higher Tier Practice - Worksheets, Questions and Revision

5 original exam-style questions - 2 pages of questions with a full mark scheme - free printable PDF.

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C10H Using Resources: Higher Tier Practice

AQA 8462 · Calculator allowed · about 95 minutes
Total Marks
Name: _______________________________    Date: ____ / ____ / ______
Answer ALL questions. Show all your working.
1
A student lists four processes: extraction of metal from ore, polymer manufacture, water desalination, and electroplating a coating onto steel.
(a)State which one of these processes is used to produce potable water from seawater, and name the method typically used.(2)
(b)State which one of these processes can be used to help prevent corrosion of steel.(1)
(Total for Question 1 is 3 marks)
2
Stainless steel contains iron, chromium and sometimes nickel. State why chromium is added to steel.
(a)State the purpose of adding chromium to steel.(1)
(Total for Question 2 is 1 mark)
3
A sample of impure copper ore contains 2.50 g of copper metal. After purification by electrolysis the student obtained 2.10 g of pure copper. Calculate the percentage yield of copper.
(a)Calculate the percentage yield. Give your answer to two significant figures.(3)
(Total for Question 3 is 3 marks)
4
Ammonium nitrate, NH4NO3, is a common nitrogen-based fertiliser made industrially using ammonia produced by the Haber process. Relative atomic masses: N = 14, H = 1, O = 16.
(a)Calculate the relative formula mass (Mr) of ammonium nitrate, NH4NO3.(1)
(b)Calculate the percentage by mass of nitrogen in ammonium nitrate. Give your answer to the nearest whole number.(2)
(Total for Question 4 is 3 marks)
5
Recycling aluminium requires only about 5% of the energy needed to extract the same mass of new aluminium from its ore by electrolysis. Extracting 1 tonne of new aluminium from its ore requires approximately 15 000 kWh of energy.
(a)Calculate the energy needed to produce 1 tonne of aluminium by recycling.(2)
(b)Calculate the percentage reduction in energy used when 1 tonne of aluminium is recycled rather than extracted from ore.(2)
(Total for Question 5 is 4 marks)
Mark scheme · C10H Using Resources: Higher Tier Practice

Question 1

Question 2

Question 3

Question 4

Question 5