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Alhussan Chemistry — Stage 8

Chapter 7: Inside Atoms

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Chapter 8: Pure Substances and Solutions

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Chapter 9: Chemical Reactions 2

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Quiz

Chemistry 8.6 Chlorine and water — Quiz

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  • Questions count: 50
  • Passing grade: B+
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1.
Small particles settle by ____.
chlorination
distillation
evaporation
sedimentation
2.
Which is the correct definition of “Cholera”?
A solution that can still dissolve more solute.
Health of the whole population.
Instrument measuring temperature.
Disease spread by dirty water.
3.
Which statement is NOT correct?
Filtration kills microorganisms.
Too much chlorine can be harmful.
John Snow linked cholera to a water pump.
Only a small amount of chlorine is added.
4.
Clean water reduces ____.
tides
disease
rain
wind
5.
Chlorine is in Group ____.
1
2
7
0
6.
Which term matches this definition? “Added to water in some areas for teeth.”
Filtration
Fluoride
Soluble
Insoluble
7.
Chlorine kills harmful ____.
salts
ions
minerals
microorganisms
8.
Which statement is NOT correct?
Untreated water can contain solids, microorganisms and chemical pollutants.
Sedimentation removes dissolved salts.
Boiling water also kills microorganisms.
Clean water reduces disease.
9.
Cases fell from 2500 to 600. Calculate the percentage decrease.
1900.0%
76.0%
316.7%
24.0%
10.
Boiling water also kills ____.
salts
microorganisms
ions
minerals
11.
True or false? Clean water reduces disease.
True
False
12.
True or false? Cholera is caused by air pollution.
True
False
13.
Clean water saves more lives than almost any other ____ measure.
farming
building
public health
sporting
14.
Cholera cases after chlorination began. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 1
A
B
C
D
15.
Cases fell from 5000 to 10. Calculate the percentage decrease.
4990.0%
49900.0%
0.2%
99.8%
16.
Chlorine is made by electrolysis of sodium ____ solution.
chloride
carbonate
hydroxide
sulfate
17.
Access to safe water worldwide (%). What is the value of "People with safe water (%)" when "Year" is 2000?
Dr Dabour Hub Academy - figure 2
100
91
97
99
18.
Chlorine level in a swimming pool (mg/dm³). Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 3
"Chlorine (mg/dm³)" decreases as "Hour" increases
"Chlorine (mg/dm³)" stays the same
"Chlorine (mg/dm³)" increases as "Hour" increases
"Chlorine (mg/dm³)" rises to a peak at 8, then falls
19.
Chlorine level in a swimming pool (mg/dm³). Calculate the percentage change in "Chlorine (mg/dm³)" from 8 to 18.
Dr Dabour Hub Academy - figure 4
60%
−60%
40%
−150%
20.
True or false? Chlorine is also used in swimming pools.
True
False
21.
A pool of 500 m³ needs 3 g of chlorine per m³. Total chlorine in kg?
1500.0 kg
1.5 kg
15.0 kg
166.7 kg
22.
Access to safe water worldwide (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 5
A
B
C
D
23.
Which term matches this definition? “Green-yellow toxic gas used to treat water.”
Cholera
Microorganism
Chlorine
Prediction
24.
Bacteria per cm³ at treatment stages. Which has the smallest value?
Dr Dabour Hub Academy - figure 6
River
Filtration
Sedimentation
Chlorination
25.
Access to safe water worldwide (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 7
A
B
C
D
26.
Fluoride helps prevent tooth ____.
loss of enamel colour only
colour
decay
growth
27.
A pool of 300 m³ needs 3 g of chlorine per m³. Total chlorine in kg?
9.0 kg
900.0 kg
100.0 kg
0.9 kg
28.
True or false? Large solids are removed by screening.
True
False
29.
Chlorine level in a swimming pool (mg/dm³). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
30.
Bacteria fell from 8000 to 500 per cm³. Calculate the percentage decrease.
6%
94%
7500%
1500%
31.
Which statement is correct?
Chlorine gas is harmless.
Treated water must be tested regularly.
Chlorine is a noble gas.
Untreated water is always safe.
32.
Which is the correct definition of “Chlorine”?
Instrument measuring temperature.
Boiling and condensing to separate a solvent.
Liquid that dissolves the solute.
Green-yellow toxic gas used to treat water.
33.
Too much chlorine can be ____.
tasteless
helpful
nutritious
harmful
34.
Chlorine level in a swimming pool (mg/dm³). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 9
A
B
C
D
35.
Chlorine fell from 2.8 to 1.4 mg/dm³ in 10 h. Mean rate of loss?
14.00 mg/dm³ per h
0.42 mg/dm³ per h
0.28 mg/dm³ per h
0.14 mg/dm³ per h
36.
pH may be ____.
ignored
doubled
adjusted
frozen
37.
True or false? Fluoride causes tooth decay.
True
False
38.
Cholera cases after chlorination began. At what value of "Year" is "Cases" greatest?
Dr Dabour Hub Academy - figure 10
1910
1920
1940
1900
39.
Untreated water can contain solids, microorganisms and chemical ____.
pollutants
proteins
sugars
vitamins
40.
Access to safe water worldwide (%). Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 11
"People with safe water (%)" rises to a peak at 2020, then falls
"People with safe water (%)" decreases as "Year" increases
"People with safe water (%)" increases as "Year" increases
"People with safe water (%)" falls to a minimum at 2000, then rises
41.
What is the active disinfectant when chlorine reacts with water?
Hydrochloric acid
Sodium chloride
Oxygen
Chloric(I) acid (hypochlorous acid)
42.
Access to safe water worldwide (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 12
A
B
C
D
43.
Chlorine level in a swimming pool (mg/dm³). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 13
A
B
C
D
44.
Which term matches this definition? “Letting solids settle out.”
Dependent variable
Sedimentation
Evaluation
Solubility curve
45.
Cholera cases after chlorination began. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 14
"Cases" stays the same
"Cases" decreases as "Year" increases
"Cases" increases as "Year" increases
"Cases" rises to a peak at 1900, then falls
46.
Which is the correct definition of “Filtration”?
Tiny living thing, some cause disease.
Passing water through sand or gravel to remove particles.
Water safe to drink.
Sum of results divided by number of results.
47.
Which statement is NOT correct?
Fluoride causes tooth decay.
Water passes through beds of sand.
Filtration does not remove dissolved salts.
Chlorine is also used in swimming pools.
48.
Which is the correct definition of “Chlorination”?
Smooth line showing the trend.
Boiling and condensing to separate a solvent.
Health of the whole population.
Adding chlorine to kill microorganisms.
49.
Which statement is correct?
Cholera is caused by air pollution.
Boiling cannot kill microorganisms.
Chlorine is a noble gas.
Filtration does not remove dissolved salts.
50.
Bacteria per cm³ at treatment stages. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 15
A
B
C
D
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Part of Chapter 8: Pure Substances and Solutions — see every lesson and quiz in this unit.
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