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WorksheetsCHAPTER 5: WATER AND SOLUTION
Total questions: 18
Worksheet time: 17mins
The boiling point of pure water is (a) 0ºC
The freezing point of pure water is (a) ºC
All the towels are wet and dried in the sun. State the towel which will dry first.
(a)
During winter, there are vehicles that spread salt on the icy road. Why do they do so?
Salt is used to melt the accumulated ice on the road
Salt increase the melting point of ice
Salt lowers the melting point of ice
Water can be separated into its element by (a)
One molecule of water consists of
one atom of oxygen and one atom of hidrogen
two atoms of oksigen and one atom of hidrogen
two atoms of nitrogen and one atom of oxygen
two atoms of hydrogen and one atom of oxygen
Which of the statements below are true
The higher the humidity of the air is, the higher the rate of evaporation will be
The higher the surrounding temperature is, the higher the rate of evaporation will be
The faster the movement of air is, the lower the rate of evaporation will be
The bigger the exposed surface area is, the higher the rate of evaporation will be
What gas that released in the test tube P?
(a)
What is the ratio of oxygen to hydrogen in the electrolysis of water?
2:1
2:3
1:2
1:1
Which of the following factors will cause a wet towel to dry faster ?
Hot sun
Damp air
Towel folded
Wind
Mark for the correct statement
When gas Q is tested with a burning wooden splinter, a 'pop' sound is produced.
Sulphuric acid is added to distilled water to make the water conduct electricity better
Oxygen is collected at Q
Hidrogen is collected at P
In the electrolysis of water, if the volume of oxygen collected is 10cm3, predict the volume of hidrogen collected?
5cm3
10cm3
15cm3
20cm3
Which of the statements are true about evaporation
occurs at any temperature
happens at the surface of water
changes water into solid
takes place only at the boiling point of water
What happens when a little salt is added to water?
Boil above 100C
Freeze above 0C
Evaporate faster
Become acidic
What is the chemical formula for water
NO2
CO2
H02
H20
True statements about evaporation
Process which water vapour changes to water
A fast process
Occurs at any temperature
Takes place at water surface only
The diagram below shows towel hanging on a rail.
Which of the following factor will cause the clothes to dry faster?
Higher humidity of air
Rainy days
Lower temperature of the surrounding
High speed of wind
What does chlorination do to the water?
kills microorganisms
Cleans the water
Makes the water taste nice
Removes twigs and sediment
