O-LevelChemistryChemistry of the Environment5070/22 · May/June 2014 · Q14 Marks
Choose from the following gases to answer the questions below. CCIF3 CH4 CO CO2 H2 N2 NH3 O2 SO2 Each gas can be used once, more than once or not at all. Which gas is
- (a)used in making steel,[1]
- (b)made by the bacterial decay of vegetable matter,[1]
- (c)responsible for ozone depletion in the upper atmosphere,[1]
- (d)used to manufacture margarine?[1]
Mark scheme
Marking points from the official mark scheme (May/June 2014). The mark or mark type is shown in brackets.
- [1] (a) O2 (1)
- [1] (b) CH4 (1)
- [1] (c) CClF3 (1)
- [1] (d) H2 (1)
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