Metals, Plastics, Fertilisers, Nuclear Chemistry Worksheet - National 5 Unit 3 Page 10
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13Exercise 9
1. Ammonia is produced in the Haber process.
The percentage yield of ammonia, obtained at different pressures, is shown in the
table.
Pressure (atms)
% yield of ammonia
50
6
100
10
150
14
200
19
250
22
350
29
400
32
a) Draw a line graph of the results.
b) Using your graph, estimate the yield of ammonia at 300 atmospheres.
Temperature is another factor which affects the percentage yield of ammonia.
c) Suggest a reason why 500
o
C is the temperature chosen to operate an industrial
o
ammonia plant rather than 200
C.
2. Ammonium phosphate, (NH
)
(PO
), is a synthetic fertiliser that is prepared by the
4
3
4
reaction of ammonia with phosphoric acid, H
PO
.
3
4
a) Write a balanced chemical equation for this reaction.
b) Calculate the mass (g) of 5 moles of ammonium phosphate.
3. A student carried out two experiments on compound X.
A colourless gas was
A gas was given off
given off and the
which turned the pH
limewater became
paper blue.
cloudy.
a) Name the gas given off by experiment 1.
b) Name the gas given off by experiment 2.
c) Name compound X.
d) Write an ionic equation to show the reaction of X with sulphuric acid.
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