O-LevelChemistryChemistry of the Environment5070/21 · Oct/Nov 2015 · Q16 Marks
Choose from the following gases to answer the questions below. ammonia argon carbon dioxide chlorine ethane ethene nitrogen nitrogen(II) oxide oxygen sulfur dioxide Each of these gases can be used once, more than once or not at all. Which gas
- (a)forms approximately 1% of the air,[1]
- (b)bleaches damp litmus paper,[1]
- (c)reacts with water to form an alkaline solution,[1]
- (d)can undergo polymerisation,[1]
- (e)is a compound formed in the atmosphere as a result of lightning activity,[1]
- (f)is a diatomic molecule containing a total of 16 electrons?[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [1] A1 (a) argon (1)
- [1] (b) chlorine/sulfur dioxide (1)
- [1] (d) ammonia (1)
- [1] (c) ethene (1)
- [1] (e) nitrogen(II) oxide (1)
- [1] (f) oxygen (1)
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