Mini-Mock Unit 3 Aqa Gcse Chemistry Higher Tier Worksheet Page 17
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18(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
1
any other sensible economic factor linked to town
any one from:
safety
•
escape of dangerous / harmful chemicals / gases (owtte)
do not allow polluting gases unqualified
•
danger of increased traffic
•
risk of explosion.(owtte) /danger of high pressure
•
consequences of an accident could be severe if the town is close
•
any other sensible safety idea
1
any one from:
environmental
•
factory might be unsightly (owtte)
•
screening of factory (owtte)
•
loss of habitats (owtte)
•
plant trees/ hedges etc on and around plant site
•
pollution of water / air / soil could harm plants / animals or noise pollution
must be explained
•
CO
is produced by burning fuels / heating
2
•
CO
causes global warming / any effect of global warming
2
•
eye sore
•
any other sensible environmental factor
1
[12]
M15.
(a)
catalyst; accept speeds up reaction or lowers activation energy
1
(b)
(i)
an equilibrium is achieved when rate of the forward reaction
is exactly the same as the rate of the backward reaction
1
(ii)
in this equilibrium the forward reaction to form ammonia
is exothermic 1
therefore if the temperature is low the yield from the
exothermic reaction increases 1
(iii)
in this gaseous equilibrium if the pressure is high this
will favour the reaction that produces the least number
of molecules, that is, the forward reaction to form ammonia
1
[5]
M16.
(a)
16% (attempt by drawing lines etc gains 1 mark)
2
(b)
iron is a catalyst; which speeds up the reaction
2
(c)
(from the graph) the best yield is obtained at high pressure; and low temperature;
it is a reversible reaction; in which formation of ammonia is favoured at low temperature
(because) the reaction is exothermic; and the formation of ammonia is favoured at high pressure because
greater number of gaseous reactant molecules than gaseous product molecules/because greater vol of
reactant than volume of product molecules; pressure used is limited by cost/materials; rate of reaction
slow at low temperatures; actual temperature
and pressure used is a good compromise
Page 17
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