1 4.1 | CELL BIOLOGY | QUESTION PAPER 1 Score Percentage % AQA CHEMISTRY Time allowed GCSE
Chemistry of the Atmosphere
Common Atmospheric Pollutants and their Sources 1 /58 70 minutes QUESTION PAPER Q7. Copper metal is used for electric wires. An alloy of copper, called brass, is used for pins and terminals of electric plugs. (a) Copper metal is relatively soft and flexible. Give another reason why copper is used for electric wires. ............................................................................................................................. ....... .......................................................................................................................... .......... (1) (b) Brass is an alloy . What is an alloy ? ............................................................................................................................. ....... ............................................................................................................................. ....... (1) (c) Open-cast mining of copper ore makes a very large hole. (i) Suggest one environmental problem that is caused by open-cast mining of copper ore. .......................................................................................................................... ........................ .................................................................................................. (1) (ii) Some copper ores contain copper sulfide, CuS. Copper sulfide is heated in air to produce copper and sulfur dioxide. CuS + O 2 → Cu + SO 2 Suggest one environmental problem caused by heating copper sulfide in air. .......................................................................................................................... .......................................................................................................................... (1) (d) The amount of copper-rich ores is estimated to last only a few more years. New houses need several kilometres of copper wire. (i) Explain why the need to use so much copper will cause a problem in the future. .......................................................................................................................... ..................................... ..................................................................................... (1) (ii) Suggest two ways in which society could overcome this problem. 1 ....................................................................................................................... .......................................................................................................................... 2 ....................................................................................................................... .......................................................................................................................... (2) (Total 7 marks)
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