CSEC Chemistry · January 2002 · Paper 2 · Question 4(b)(ii)
Why is the Alcoa chlorine approach a more economical process for refining bauxite?
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- 4(a)Identify the more feasible route for the extraction of magnesium and zinc from their oxides, giving a reason for each choice.[4 marks]
- 4(b)(i)Why is the conventional process uneconomical for refining bauxite in the Caribbean?[2 marks]
- 4(c)(i)Give ONE reason why aluminium, and NOT iron, is used in the making of aircrafts.[1 mark]
- 4(c)(ii)Explain why iron rusts and aluminium does not rust, supporting your answer with suitable balanced equations.[10 marks]
- 4(a) [P2]Write a balanced equation for the reaction between hydrochloric acid and marble chips.[2 marks]
- 4(b)(i) [P2]Use data from the graph to determine the total volume of carbon dioxide evolved.[2 marks]
- 4(b)(ii) [P2]Determine the mass of carbon dioxide evolved.[1 mark]
- 4(b)(iii) [P2]Determine the mass of marble chips used.[2 marks]
- 4(c) [P2]How would you show that the gas produced is carbon dioxide?[2 marks]
- 4(d) [P2]Explain why nitric acid and NOT sulphuric acid could be used to replace the hydrochloric acid used in the investigation.[2 marks]
- 4(e) [P2]Explain why the graph has the shape shown.[2 marks]
- 4(f) [P2]Suppose that this experiment were to be repeated using calcium carbonate powder in place of marble chips, would you expect it to be completed in a shorter or…[2 marks]
More practice: the rest of this paper · more Reactivity and Extraction of Metals questions · all CSEC Chemistry past papers