Ammonia Chemical Bonding Worksheet Page 21
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28(b)
25 / 25.035 or ecf from (a)
gains 2 marks even when there is no working
incorrect answer then 304/(their answer from (a)) × 100 gains 1
mark
or using figures from part (b)
27.6 / 28
gains 2 marks even when there is no working
accept 27 for 1 mark
if answers incorrect then304/1100 × 100 gains 1 mark
2
(c)
(i)
increase yield
1
reaction is exothermic
or
allow decreased yield because rate of reaction is slower /
fewer collisions for 2 marks
must get both points for 2 marks
1
(ii)
increase yield
1
plus one from:
•
more (gaseous) reactant molecules than (gaseous)
product molecules (owtte)
accept greater volume on the left than the right owtte
•
increased rate of reaction / more collisions
1
(d)
any one from:
economic
•
large town provides workforce
•
workers do not have to travel far to the factory. (owtte)
•
transport infrastructure already in place for large town. (owtte)
•
factory brings prosperity to town (owtte)
•
factory provides employment
•
reduced tourism
•
reduction in local house prices
•
any other sensible economic factor linked to town
1
Page 21 of 28
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