2003 Chemistry Higher Finalised Marking Instructions - eduBuzz
2003 Chemistry Higher Finalised Marking Instructions - eduBuzz
2003 Chemistry Higher Finalised Marking Instructions - eduBuzz
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Mark Scheme Worth ½ Worth 0<br />
iron is formed (in question)<br />
or<br />
exothermic<br />
4. (a) any suggestion that iron formed is molten or in liquid<br />
state<br />
or<br />
answer implies that iron flows down into crack 1 or<br />
rail melts, etc<br />
(b) ∆H required = ∆H1 – ∆H2<br />
= (-1676) – (-825) (½)<br />
= - 851 kJ (mol -1 ) (½)<br />
(2)<br />
Page 8
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