Ammonia Chemical Bonding Worksheet Page 18
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28M2.
(a)
fewer product molecules than reactant molecules (owtte) or
accept forward reaction produces fewer molecules
accept left hand side for reactants and right hand side for products
3 reactant molecules and 1 product
or 3 volumes of gas becomes 1 volume of gas
accept high pressure favours the side with fewer molecules
ignore references to reaction rate
1
(b)
any three from:
•
low temperature gives best yield
accept add heat as increased temperature or ‘less’ as poor yield
or high temperature gives poor yield
•
because the reaction is exothermic
accept reverse argument if clearly expressed
•
reaction too slow at low temperature
or reaction faster at high temperature
accept add heat and reaction goes faster
•
temperature used gives a reasonable yield
at a fast rate / compromise explained
allow get less product but it takes less time
for 2 marks
3
[4]
(a)
(i)
nitrogen + hydrogen → ammonia
M3.
accept full correct balanced equation
1
(ii)
reversible (reaction) (owtte)
do not allow just ‘backwards’ (unqualified)
1
(iii)
catalyst / speed up reaction
accept to lower activation energy
1
(iv)
boiling point
1
(v)
recycled (owtte)
1
(b)
(i)
used to make explosives (owtte) used to make medicines (owtte)
1
(ii)
used to make fertilisers (owtte)
1
Page 18 of 28
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