Ammonia Chemical Bonding Worksheet Page 27
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28(c)
ideas that
•
nitrates may get into ground water / rivers
•
so contaminate / get into our drinking water
•
eating animals which have eaten crop/ or eating contaminated fish
[do not allow ‘eutrophication’]
any two for 1 mark each
2
(d)
(i)
idea that
when rate of forward = rate of reverse reaction
[not just ‘reversible’ or ‘can be reversed’]
[allow ammonia is breaking up into nitrogen and hydrogen
as fast as nitrogen and hydrogen are forming ammonia
or amounts of products and reactants stay constant]
for 1 mark
1
(ii)
ideas that
•
at higher temperatures, equilibrium moves to the left
or reverse / endothermic
reaction / favoured or makes products → reactants
•
•
but at lower temperatures the (rate of) reaction is (very) slow
•
so a higher temperature is used for economic reasons/so ammonia is
produced at higher rate
•
iron powder is a catalyst / speeds up the reaction
[not increases the yield]
•
low yield not wasteful if reactants re-cycled
[credit iron powder has a greater surface area]
each for 1 mark
4
[9]
Page 27 of 28
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