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Essential Chemistry for IGCSE - Air And Water (Section 3)

1
Which can cause climate change?
Answer
A
B
C
2
Incomplete combustion of fuels produces:
Answer
(B)
Carbon monoxide
3
The greenhouse effect is primarily caused by:
Answer
(A)
The absorption of infrared radiation by greenhouse gases.
4
Which process is used to obtain nitrogen and oxygen?
Answer
(C)
Fractional distillation
5
How does the greenhouse effect work?
Answer
(B)
Greenhouse gases trap the sun's rays
6
What chemical is used to remove small particles by causing them to clump together in water treatment?
Answer
(B)
Aluminum sulfate
7
What type of water purification process involves adding aluminum sulfate?
Answer
(B)
Sedimentation.
8
Which gas makes up approximately 78% of the Earth's atmosphere?
Answer
(B)
Nitrogen
9
What is the role of a catalytic converter in a car?
Answer
(B)
To reduce air pollution
10
What is the role of the filtration stage in water purification?
Answer
(C)
To separate small particles.
11
What are the effects of climate change?
Answer
A
B
D
12
What does a catalytic converter do?
Answer
(B)
Converts unburnt fuel to safe elements
13
What is the name for the process that absorbs carbon dioxide from the atmosphere?
Answer
(C)
Photosynthesis
14
Which of these are greenhouse gases?
Answer
B
C
15
What is a major product of incomplete combustion?
Answer
(B)
Carbon monoxide
16
What is the role of zinc when used for sacrificial protection?
Answer
(C)
Zinc oxidizes instead of the iron
17
What is removed by the process of filtration during water purification?
Answer
(B)
Small particles
18
What type of combustion results in the production of carbon monoxide?
Answer
(B)
Incomplete
19
What is the name of the process where the mixture of nitrogen and oxygen undergoes fractional distillation?
Answer
(A)
Fractional distillation
20
What causes acid rain?
Answer
(B)
Sulfur dioxide and nitrogen oxides combining with water.
21
Which compound is hydrated iron(III) oxide?
Answer
(A)
Rust
22
What is the process by which nitrogen-containing compounds are converted to nitrogen gas, which occurs in soil and can cause air pollution?
Answer
(B)
Denitrification.
23
What happens to the zinc when it is scratched in galvanised steel?
Answer
(B)
It corrodes rather than the iron
24
What processes release carbon dioxide into the atmosphere?
Answer
B
C
D
25
What is a major source of sulfur dioxide?
Answer
(A)
Volcanoes
26
Which of the following is a greenhouse gas?
Answer
(C)
Methane
27
What is the primary effect of the greenhouse effect on Earth?
Answer
(C)
Rise in Earth's temperature.
28
What is the primary function of aeration in water treatment?
Answer
(B)
To add oxygen.
29
What is the process used to separate the components of air?
Answer
(B)
Fractional Distillation
30
What are the primary forms of carbon in the carbon cycle?
Answer
A
C
D
31
What type of radiation is primarily trapped by greenhouse gases, leading to global warming?
Answer
(B)
Infrared radiation
32
Which of the following is a greenhouse gas?
Answer
(B)
Carbon Dioxide
33
What is the general function of a catalytic converter in a car's exhaust system?
Answer
(B)
To reduce harmful emissions.
34
Which of the following processes *removes* carbon dioxide from the atmosphere?
Answer
(C)
Photosynthesis
35
What is the approximate percentage of nitrogen in the air?
Answer
(C)
78%
36
Which is not a type of air pollution?
Answer
(B)
Nitrogen
37
What is added to the water to make small particles clump together?
Answer
(B)
Aluminum Sulfate
38
Which is the major gas present in the air that is needed for respiration?
Answer
(B)
Oxygen
39
What dangerous gas is often produced by the incomplete combustion of fuels?
Answer
(B)
Carbon Monoxide
40
Which of the following is a common component of smog?
Answer
(A)
Sulfur dioxide
41
How can rusting be prevented?
Answer
(B)
Painting, plating, or coating with plastic or greasing
42
The amount of carbon in each of these reservoirs has not changed much over millions of years. Which of the following are sources of carbon?
Answer
A
B
C
D
43
Which of these are formed when there is incomplete combustion of a fuel?
Answer
A
C
44
What is formed when sulfur dioxide and nitrogen oxides react with water in the atmosphere?
Answer
(B)
Acid rain
45
Which stage is used to remove small particles?
Answer
(C)
Filtration
46
Which of the following is used to make the small particles in water purification clump together?
Answer
(C)
Aluminum sulfate
47
Approximately what percentage of the air is made up of nitrogen?
Answer
(B)
78%
48
Which of the following gases is/are removed by a catalytic converter?
Answer
A
B
49
Which two materials are *required* for iron to rust?
Answer
(C)
Water and air
50
Which of the following is not a common air pollutant?
Answer
(C)
Water