C9: Industrial inorganic chemistry
3 The diagram shows an experiment to investigate the rusting of some iron nails. A
B
C
air
air
air
iron nail
iron nail
iron nail coated with zinc
distilled water
drying agent (calcium chloride)
distilled water
a For each tube, A, B and C, predict whether the nails will rust. In each case give a reason. b Iron from the blast furnace contains impurities such as carbon, phosphorus, silicon and sulfur. Describe how the level of these impurities is decreased when steel is made from impure iron. c State a use for stainless steel.
[3] [3] [1]
[Cambridge IGCSE Chemistry 0620 Paper 2 Q7 a, b & c November 2009] 4 Iron is extracted from its ore, hematite, in the blast furnace. waste gases
firebrick lining
raw materials coke, C iron ore, Fe2O3 limestone, CaCO3
357
air slag
molten iron
Describe the reactions involved in this extraction. Include in your description an equation for a redox reaction and one for an acid/base reaction.
[5]
[Cambridge IGCSE Chemistry 0620 Paper 32 Q4 June 2011]
Original material Š Cambridge University Press 2017