Ammonia Chemical Bonding Worksheet Page 24
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28(b)
(i)
natural gas
accept methane (CH
)
4
accept water (H
O)
2
1
(ii)
carbon dioxide
1
(c)
(i)
N
+ H
2
2
1
correct balancing 1 + 3 → 2
award only if reactants are correct
1
(ii)
iron
accept Fe
1
(iii)
at low temperatures rate of reaction is too slow
accept very few collisions at low temperatures
accept converse
particles need enough (activation) energy to react
accept particles need enough energy for bonds to break
accept converse
1
(d)
all three covalent bonds displayed correctly as electron pairs
1
two lone electrons displayed not necessarily as a pair
1
[11]
M7.
(a)
16%
for 2 marks
(attempt by drawing lines etc gains 1 mark)
2
(b)
iron is a catalyst;
which speeds up the reaction
for 1 mark each
2
Page 24 of 28
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