Chemistry Grade 9 Evaluation 1
NAME: _______________________________
Date: 20/09/2023
SECTION A: MCQ [10 marks]
1. Which substance is used by farmers to improve plant growth?
A. ammonium nitrate
B. phosphoric acid
C. potassium
D. sodium oxide
2. Which mixture contains all of the elements in a typical fertilizer?
A. ammonium nitrate and calcium phosphate
B. ammonium phosphate and potassium chloride
C. potassium nitrate and ammonium chloride
D. potassium carbonate and ammonium nitrate
3. Catalytic converters are used to remove some gaseous pollutants from car exhaust fumes.
Which gas is removed from the fumes by oxidation?
A. carbon dioxide
B. carbon monoxide
C. nitrogen
D. nitrogen oxide
4. When blue copper (II) sulfate is heated, a white solid and water are formed.
The white solid turns blue and gives out heat when water is added to it.
Which terms describe the blue copper (II) sulfate and the reactions?
Grade 9 __
5. Which gas is over 30% of air?
A. argon
B. carbon dioxide
C. nitrogen
D. oxygen
6. Which pair of compounds make an NPK fertiliser?
A. ammonium sulfate and potassium phosphate
B. calcium hydroxide and ammonium nitrate
C. calcium phosphate and potassium chloride
D. potassium nitrate and ammonium sulfate
7. Some information about gas X is listed.
● It is not present in clean, dry air.
● It is not a cause of respiratory problems.
● It is responsible for global warming.
What is X?
A. carbon dioxide
B. carbon monoxide
C. methane
D. nitrogen dioxide
8. Which compounds both contribute to acid rain?
A. carbon monoxide and carbon dioxide
B. carbon monoxide and oxides of nitrogen
C. oxides of nitrogen and sulfur dioxide
D. sulfur dioxide and carbon dioxide
9. What is the equation for photosynthesis?
A. CO2 + 3H2 → CH3OH + H2O
B. 6CO2 + 6H2O → C6H12O6 + 6O2
C. C6H12O6 → 2C2H5OH + 2CO2
D. C6H12O6 + 6O2 → 6CO2 + 6H2O
10. Water is treated at a waterworks to make it safe to drink.
What is present in the water when it leaves the waterworks?
A. bacteria and insoluble substances
B. bacteria only
C. soluble substances, including chlorine compounds
D. chlorine compounds only
SECTION B: Theory [15 marks]
1.
This question is about gases found in clean, dry air and gases found in polluted air.
(a) Name one gas found in clean, dry air which contributes to global warming.
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[1]
(b) State the percentage of nitrogen in clean, dry air.
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[1]
(c) Name the substance used to remove sulfur dioxide in flue gas desulfurization.
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[1]
(d) Nitrogen dioxide, NO2, is formed in car engines.
Name the equipment in a car exhaust used to remove the NO2 formed in car engines.
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[1]
(e) Polluted water may contain sewage or nitrates.
State one harmful effect of each of these water pollutants.
sewage ......................................................................................................................................
nitrates .......................................................................................................................................
[2]
(f) Carbon dioxide, CO2, is a reactant in photosynthesis. Name the two products of photosynthesis.
................................................................... and ..............................................................
[2]
(g) Calculate the percentage composition by mass of nitrogen in (NH4)2SO4.
percentage of nitrogen = ............................... %
2.
[2]
The diagram shows the composition of the planet Saturn.
(a) Describe how Saturn’s atmosphere differs from the Earth’s atmosphere.
Give two differences.
1. ..........................................................................................................................................
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2. ..........................................................................................................................................
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(b) Saturn’s atmosphere also contains small amounts of methane.
Small amounts of methane are present in the Earth’s atmosphere.
Methane is a greenhouse gas.
(i) Name another greenhouse gas present in the Earth’s atmosphere.
[2]
....................................................................................................................................... [1]
(ii) Scientists are concerned about the increase in the amount of greenhouse gases in the Earth’s
atmosphere.
Explain why.
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(i) Which physical property could you measure to find out if a sample of water is pure?
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