Ammonia Acid Worksheet With Answers Page 43
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49(b)
(i)
gives out
gets hot(ter) / temperature rises (1)
1
heat / energy
independent mark
1
(ii)
Quality of written communication
for clearly expressed ideas
1
take temperature of water at start
owtte
1
take temperature after adding soup powder
1
plus any one from:
•
using a thermometer
•
mix / stir / shake etc
•
in beaker / conical flask / test tube / plastic cup
•
temperature will rise (indicates an exothermic reaction)
1
[8]
M15.
(a)
(i)
high and low
both needed for mark
1
(ii)
reversible
1
(iii)
to prevent ammonium chloride / solid / particles escaping
idea of a filter
do not accept ‘to prevent gases escaping’
1
(b)
endothermic
1
[4]
M16.
(a)
endothermic and because it takes in heat / energy
both for one mark
1
Page 43 of 49
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