10 Ammonia, Set A To print: Ctrl + P, paper A4, margins Default.
Learners' AlleyDesigned by Khow Willard
10
Ammonia
Set AFoundations
Name
Time 45 minutes
Total 24 marks
Use a copy of the Periodic Table where you need one.
A
From the lesson
11 marks
1
Which statement about the iron catalyst in the Haber process is correct?
AIt increases the yield of ammonia.
BIt speeds up the reaction.
CIt stops ammonia breaking down.
DIt is used up in the reaction.
Answer [1]
Source: Learners' Alley, Ammonia slides
2
Which change increases the yield of ammonia in the Haber process?
Aincreasing the pressure
Bincreasing the temperature
Cadding more iron catalyst
Dremoving the cooler
Answer [1]
Source: Learners' Alley, Ammonia slides
3
Answer these questions about the Haber process.
(a)
Write the equation for the Haber process with state symbols.
[1]
(b)
State the source of the hydrogen used.
[1]
(c)
Why are unreacted nitrogen and hydrogen recycled?
[1]
(d)
What is meant by a reversible reaction?
[1]
Source: Learners' Alley, Ammonia slides
4
Which reaction is irreversible?
Aheating hydrated copper(II) sulfate
Bheating ammonium chloride
Cburning charcoal
Dmaking ammonia by the Haber process
Answer [1]
Source: Learners' Alley, Ammonia slides
5
Solid ammonium chloride is heated in a test tube. A piece of damp red litmus paper is held at the mouth of the tube.
(a)
Write the equation, with state symbols, for this reversible reaction.
[1]
(b)
The damp red litmus paper turns blue before any hydrogen chloride reaches it. Explain why.
[2]
(c)
A white solid forms near the top of the tube. Name the solid and state why it forms there.
[1]
Source: Learners' Alley, Ammonia slides
B
Practice
13 marks
6
In the Haber process, nitrogen and hydrogen react to form ammonia. What is the source of hydrogen?
Acracking of oil fractions
Belectrolysis of water
Cfractional distillation of liquid air
Dreaction between acid and metal
Answer [1]
Source: 2024 AMKSS Prelim P1 Q15
7
Which statement about the Haber process is not correct?
AA catalyst of iron is used.
BHydrogen is obtained from fractional distillation of liquid air.
CThe reaction is reversible.
DEach nitrogen molecule reacts with three hydrogen molecules to form two molecules of ammonia.
Answer [1]
Source: 2024 Dunman Prelim P1 Q25
8
Which statement about the manufacture of ammonia in the Haber process is incorrect?
AA 100% yield of ammonia will not be obtained in the reaction.
BHigh pressure is used to increase the yield of ammonia.
CIron is used to increase the yield of ammonia.
DNitrogen is obtained from fractional distillation of liquid air.
Answer [1]
Source: 2024 CHIJ Prelim P1 Q17
9
Which of the following can increase the yield of ammonia in the Haber process?
Aincrease the pressure to 450 atm
Bincrease the temperature to 1000 °C
Cuse equal volumes of nitrogen and hydrogen
Duse platinum as a catalyst
Answer [1]
Source: 2024 AMKSS Prelim P1 Q16
10
Ammonia gas is produced using the Haber process. Which statement best explains why a higher temperature of 450 °C is used, although a lower temperature of 250 °C produces a higher yield of ammonia?
AAt 250 °C, a smaller volume of ammonia will be collected.
BAt 250 °C, the rate of ammonia production is too low.
CAt 450 °C, the catalyst will be more effective.
DAt 450 °C, ammonia will be collected in the gaseous state.
Answer [1]
Source: Broadrick Prelim P1 Q23
11
Which statement about the Haber process is correct?
ABoth gaseous reactants are obtained from fractional distillation of liquid air.
BFinely-divided iron is used to increase the rate and yield of the reaction.
CHigh pressure is used to increase the rate and yield of the reaction.
DHigh temperature is used to increase the rate and yield of the reaction.
Answer [1]
Source: 2024 SJI Prelim P1 Q17
12
Ammonia gas can be made industrially by reacting nitrogen with hydrogen in the Haber process. The conditions are 450 °C and 250 atm, with finely divided iron as the catalyst. The reaction is reversible.
(a)
Write the chemical equation for the formation of ammonia in the Haber process.
[2]
(b)
State the source of either nitrogen or hydrogen.
[1]
Source: 2023 XMS Sec 3 WA3 Q7(b)
13
The Haber process uses iron as a catalyst and involves a reversible reaction.
(a)
What is meant by a reversible reaction?
[1]
(b)
State two other conditions used in the Haber process.
[1]
Source: 2024 Jurongville Prelim P2 Q7(b)
14
The Haber process is used to manufacture ammonia in the chemical industry.
(a)
State the optimum conditions used in the Haber process.
[1]
(b)
Explain why the yield of ammonia produced in the Haber process can never be 100%.