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Unit 1 - Lesson 4 : Water
Unit 1 - Lesson 4 : Water
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اختبار خاص بالمعلم:
hend walid
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1
All the following are among the properties of water except............
it decomposes by heat into its elements.
it has neutral effect on litmus paper.
its volume increases by freezing.
it is a polar compound.
2
A liquid boils at 100°C. What is the other property, which confirms that it is pure water?............
Its density decreases on freezing.
It has a neutral effect on litmus paper.
It evaporates on heating.
It dissolves table sugar.
3
The electrolysis of acidified water gives hydrogen gas and oxygen gas at a ratio of........... by volume.
2:1
1:2
2:3
1:3
4
In the electrolysis of acidified water by using "Hofmann's voltameter", the volume of hydrogen gas that evolves is (40 cm³), so the volume of oxygen gas that evolves is ...... cm³.
80
10
20
40
5
The volume of hydrogen gas evolving from water electrolysis equals........... the oxygen volume
double
half
that of
four times
6
The water of a pool contains minerals, oxygen, organic fertilizer, animals wastes and green algae. What is the number of pollutants found in it ?.........
3
4
2
1
7
Increasing the concentration of ........... in drinking water causes blindness.
chlorine
mercury
arsenic
lead
8
Arsenic increases the infection rate by.........
hepatitis.
typhoid.
brain cancer.
liver cancer.
9
........... pollution causes the death of marine creatures due to the separation of the dissolved oxygen from water.
Thermal
Radiant
Biological
Chemical
10
Which of the following behaviours causes radiant pollution ?..........
Using water in cooling the nuclear reactors.
Leakage of radioactive materials from nuclear reactor.
No correct answer
Discharging of sewage in seas.
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