Ammonia Acid Worksheet With Answers Page 44
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49(b)
(i)
reversible reaction (or explanation)
1
(ii)
add water
do not accept cooling or reverse the reaction
1
[3]
M17.
(a)
the bag gets cold because heat energy is taken in from the surroundings
1
(b)
endothermic
1
(c)
any two from:
•
mix / spread (the ammonium nitrate and water)
•
dissolve faster(*)
•
get cold faster or so the whole bag gets cold(*)
(*)allow increase rate or quicker reaction
•
particles collide more or more collisions
2
[4]
M18.
(a)
gives out (heat)
1
(b)
D
1
(c)
L
1
(d)
magnesium chloride
1
[4]
M19.
(a)
(i)
any one from:
•
they are positive / cations
+
•
they are H
•
opposite charges attract
ignore atom
1
Page 44 of 49
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