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Essential Chemistry for IGCSE - Air And Water (Section 1)

1
Which of the following gases is/are classified as greenhouse gases?
Answer
A
B
2
What gas does air contain the most?
Answer
(B)
Nitrogen
3
What is the primary use of the water in industry?
Answer
(D)
A solvent
4
What are the primary gases responsible for acid rain?
Answer
(B)
Sulfur dioxide and nitrogen oxides
5
Which of these lead to climate change?
Answer
A
C
D
6
What is the primary danger from carbon monoxide poisoning?
Answer
(C)
It interferes with oxygen transport in the blood.
7
What are the two important regulating features of the carbon cycle?
Answer
(B)
Photosynthesis and respiration
8
In which part of the plant does photosynthesis occur?
Answer
(C)
The leaves
9
What is the primary process by which living things get energy from food?
Answer
(C)
Respiration
10
What happens when fuels burn with insufficient oxygen?
Answer
(B)
Carbon monoxide is produced.
11
What is the name for the process by which metals are coated with another metal to prevent rust?
Answer
(C)
Galvanising
12
What is a cause of acid rain?
Answer
(C)
Sulfur dioxide and nitrogen oxides in the atmosphere
13
How are oxygen and nitrogen separated from air?
Answer
(A)
Distillation
14
What is the approximate percentage of oxygen in the air?
Answer
(A)
21%.
15
Which of the following is an example of sacrificial protection?
Answer
(C)
Galvanising a steel pipe with zinc
16
In water purification, which step removes large objects like leaves and debris?
Answer
(D)
Screening.
17
Which metal is commonly used in galvanising to protect steel?
Answer
(C)
Zinc
18
What is the source of most carbon monoxide emissions?
Answer
(B)
Incomplete combustion.
19
What two main gases are separated using fractional distillation of liquid air?
Answer
(C)
Nitrogen and oxygen
20
What type of metal is used in a sacrificial protection system?
Answer
(C)
A more reactive metal
21
What kind of rays are captured by greenhouse gases?
Answer
(B)
Infrared radiation
22
What is the name given to the method of rust prevention where the iron is coated with another metal?
Answer
(B)
Metal plating
23
What process is used to separate gases in the air?
Answer
(B)
Fractional Distillation
24
What is the purpose of the filters in water treatment?
Answer
(C)
To remove fine particles
25
What is the main process used to separate nitrogen and oxygen from the air?
Answer
(B)
Fractional distillation of liquid air.
26
Which of the following is a source of air pollution?
Answer
(B)
Volcanoes.
27
Which of the following is/are a consequence(s) of climate change?
Answer
A
B
C
D
28
What is the effect of rising levels of greenhouse gases?
Answer
(B)
Increase in sea levels
29
What is the main cause of the greenhouse effect?
Answer
(C)
The absorption of infrared radiation by greenhouse gases.
30
What term is used for the eating away of metal surfaces?
Answer
(B)
Corrosion
31
What is the main cause of rising sea levels?
Answer
(A)
Melting glaciers and ice sheets.
32
What does the formula for respiration look like?
Answer
(A)
C6H12O6 + 6O2 -> 6CO2 + 6H2O
33
Which condition is necessary for rusting?
Answer
A
B
34
What is corrosion?
Answer
(B)
The reaction of a metal with its environment
35
What chemical is added to water to kill bacteria?
Answer
(B)
Chlorine
36
Which type of combustion is better for the environment and why?
Answer
(B)
Complete combustion, because it produces less carbon monoxide.
37
Which is not a use of water?
Answer
(D)
Melting
38
Which is the following is/are consequence(s) of global warming?
Answer
A
B
C
39
How does a catalytic converter decrease pollution?
Answer
(B)
By oxidizing or reducing pollutants into less harmful substances.
40
Which of these can change climate?
Answer
A
C
D
41
Which of the following is an example of a particulate air pollutant?
Answer
(C)
Dust
42
How does carbon dioxide get into the atmosphere?
Answer
(C)
By burning fuels
43
What is the main gas that humans breathe in from the air?
Answer
(B)
Oxygen
44
Which of the following contribute to acid rain?
Answer
A
B
45
In the context of rust prevention, what is sacrificial protection?
Answer
(C)
A method where a more reactive metal corrodes instead of the less reactive metal.
46
What method is used to separate the gases in air?
Answer
(B)
Distillation
47
Which of the following pollutants is a known component of smog?
Answer
(C)
Sulfur Dioxide
48
What is the most abundant gas in the Earth's atmosphere?
Answer
(B)
Nitrogen
49
What compound is a key contributor to acid rain?
Answer
(B)
Sulfur dioxide
50
Which step in water treatment removes solid particles by passing water through layers of sand and gravel?
Answer
(B)
Filtration