Curriculum
Course: Alhussan Chemistry — Stage 8
Login

Curriculum

Alhussan Chemistry — Stage 8

Chapter 7: Inside Atoms

0/14

Chapter 8: Pure Substances and Solutions

0/26

Chapter 9: Chemical Reactions 2

0/33
Quiz

Chemistry 8.2 Drinking seawater — Quiz

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit
  • Questions count: 50
  • Passing grade: B+
Start Quiz
1.
Which statement is NOT correct?
Seawater is 35% salt.
Drinking seawater dehydrates you.
Reverse osmosis uses a membrane.
The solvent has a much lower boiling point than the salt.
2.
Seawater is 3.5% salt. Mass of salt in 1000 kg of seawater?
35.00 kg
285.71 kg
965.00 kg
3500.00 kg
3.
True or false? Distilled water is pure.
True
False
4.
True or false? The condenser is heated.
True
False
5.
Which statement is correct?
Seawater is 35% salt.
The distillate is salty.
The condenser is heated.
Drinking seawater dehydrates you.
6.
Which statement is NOT correct?
Salt evaporates first.
Distillation separates a solvent from a solution.
The condenser is cooled by cold water.
About half of Saudi Arabia's drinking water comes from the sea.
7.
True or false? Cold water enters at the top of the condenser.
True
False
8.
Energy used per m³ of water. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 1
A
B
C
D
9.
Temperature at the side arm during distillation of salt water. What is the value of "Temperature (°C)" when "Time (min)" is 10?
Dr Dabour Hub Academy - figure 2
98
100
60
20
10.
Which term matches this definition? “Water with very little salt.”
Dilution
Purity test
Ethanoic acid
Fresh water
11.
Seawater is 3.5% salt. Mass of salt in 1 kg of seawater?
3.50 kg
0.29 kg
0.04 kg
0.96 kg
12.
Which term matches this definition? “Removing salt from seawater.”
Dehydration
Desalination
Salinity
Dead Sea
13.
True or false? Drinking seawater quenches thirst.
True
False
14.
Sources of drinking water in a desert country (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 3
A
B
C
D
15.
Sources of drinking water in a desert country (%). About how many times bigger is Desalination than Other?
Dr Dabour Hub Academy - figure 4
22.9
15.2
7.6
30.5
16.
Reverse osmosis uses a ____.
membrane
flame
magnet
condenser
17.
True or false? Anti-bumping granules stop violent boiling.
True
False
18.
Volume of distillate collected. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 5
A
B
C
D
19.
True or false? Salt is left behind in the flask.
True
False
20.
Energy used per m³ of water. About how many times bigger is Distillation than Reverse osmosis?
Dr Dabour Hub Academy - figure 6
7.6
1.9
5.7
3.8
21.
Sources of drinking water in a desert country (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 7
A
B
C
D
22.
Energy used per m³ of water. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 8
A
B
C
D
23.
Salt is left behind in the ____.
condenser
flask
thermometer
beaker of distillate
24.
Sources of drinking water in a desert country (%). What is the total of all the values?
Dr Dabour Hub Academy - figure 9
61
124
111
137
25.
25 cm³ of distillate collected in 20 min. Mean rate?
1.25 cm³/min
0.80 cm³/min
45.00 cm³/min
500.00 cm³/min
26.
Seawater is 3.5% salt. Mass of salt in 50 kg of seawater?
1.75 kg
175.00 kg
48.25 kg
14.29 kg
27.
Volume of distillate collected. Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 10
A
B
C
D
28.
About half of Saudi Arabia's drinking water comes from the ____.
lakes
rain
rivers
sea
29.
Temperature at the side arm during distillation of salt water. At what value of "Time (min)" is "Temperature (°C)" smallest?
Dr Dabour Hub Academy - figure 11
8
6
0
2
30.
True or false? Saudi Arabia has many rivers.
True
False
31.
Which statement is correct?
Salt evaporates first.
Distillation needs little energy.
Ethanol can be separated from water by distillation.
Filtering removes dissolved salt.
32.
Distillation uses 12 kWh/m³ and RO 3. Calculate the percentage saving with RO.
300%
75%
9%
25%
33.
True or false? Salt boils at 100 °C with the water.
True
False
34.
Which statement is correct?
Distillation needs little energy.
The distillate is salty.
The condenser is heated.
Distillation separates a solvent from a solution.
35.
Water evaporates and the vapour is ____.
filtered
burnt
condensed
frozen
36.
Seawater is 3.5% salt. Mass of salt in 10 kg of seawater?
2.86 kg
0.35 kg
9.65 kg
35.00 kg
37.
Which is the correct definition of “Reverse osmosis”?
Pushing seawater through a membrane to remove salt.
Removing salt from seawater.
A coloured substance.
How salty water is.
38.
True or false? Saudi Arabia has very little rain.
True
False
39.
Temperature at the side arm during distillation of salt water. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 12
"Temperature (°C)" decreases as "Time (min)" increases
"Temperature (°C)" rises to a peak at 6, then falls
"Temperature (°C)" stays the same
"Temperature (°C)" increases as "Time (min)" increases
40.
Sources of drinking water in a desert country (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 13
A
B
C
D
41.
Volume of distillate collected. Which statement best describes the pattern?
Dr Dabour Hub Academy - figure 14
"Volume (cm³)" increases as "Time (min)" increases
"Volume (cm³)" rises to a peak at 20, then falls
"Volume (cm³)" decreases as "Time (min)" increases
"Volume (cm³)" stays the same
42.
Seawater contains about ____% dissolved salts.
3.5
50
0.35
35
43.
A plant makes 10000 m³ of water a day using 15 kWh per m³. Energy per day?
1,500,000 kWh
10,015 kWh
150,000 kWh
667 kWh
44.
40 cm³ of distillate collected in 20 min. Mean rate?
800.00 cm³/min
0.50 cm³/min
60.00 cm³/min
2.00 cm³/min
45.
Sources of drinking water in a desert country (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 15
A
B
C
D
46.
Temperature at the side arm during distillation of salt water. At what value of "Time (min)" is "Temperature (°C)" greatest?
Dr Dabour Hub Academy - figure 16
4
8
6
10
47.
True or false? Distillation needs little energy.
True
False
48.
Sources of drinking water in a desert country (%). Which graph shows these results correctly?
Dr Dabour Hub Academy - figure 17
A
B
C
D
49.
Which is the correct definition of “Distillation”?
Contains only one element or compound.
Temperature at which a solid melts.
Heat until mass stops changing.
Separating a solvent from a solution by boiling and condensing.
50.
Ethanol can be separated from water by ____.
filtering
magnets
distillation
sieving
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
Part of Chapter 8: Pure Substances and Solutions — see every lesson and quiz in this unit.
Accepted payment methods