2:18 know the conditions under which iron rusts

Iron rusts when oxygen and water are present.

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Past paper questions on spec point:

Spec	Q'stion	Ans	MS
2:18	Jan '13 (1), Q 4 a i	Answer	MkS
2:18	Jan '13 (1), Q 4 a ii	Answer	MkS
2:18	Jan '13 (1), Q 4 b i	Answer	MkS
2:18	Jan '13 (1), Q 4 b ii	Answer	MkS
2:18	Jan '13 (1), Q 4 b iii	Answer	MkS
2:18	Jan '13 (1), Q 4 b iv	Answer	MkS
2:18	Jan '14 (1), Q 3 d i	Answer	MkS
2:18	Jan '14 (1), Q 3 d ii	Answer	MkS
2:18	Jan '15 (2), Q 3 c	Answer	MkS
2:18	Jan '16 (1), Q 9 d i	Answer	MkS
2:18	May '10 (2), Q 3 a	Answer	MkS
2:18	May '14 (1R), Q 3 a i	Answer	MkS
2:18	May '14 (1R), Q 3 a ii	Answer	MkS
2:18	May '16 (2R), Q 2 a	Answer	MkS
2:18	May '16 (2R), Q 2 b	Answer	MkS
2:18	May '17 (1), Q 3 b i	Answer	MkS
2:18	May '17 (1), Q 3 b ii	Answer	MkS
2:18	May '17 (1R), Q 2 a	Answer	MkS