Core &
Ext. Metals: Extraction
Slide 39 of 45
Paper 2 Practice
Questions
60
nitrogen
4
hydrogen
24
carbon monoxide
12
carbon dioxide
percentage of
gas
in the mixture
gas
(i) The hydrogen in the waste gas is formed by
the reaction of hot carbon with water vapour. There is no water in the materials added to
the top of the furnace. Suggest where this water vapour comes from. [1]
(ii) The reaction of hot carbon with water
vapour is endothermic. What is meant by the term
endothermic? [1]