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CHAPTER 5 : WATER AND SOLUTION

Total questions: 50

Worksheet time: 41mins

Name
Class
Date
1.

During winter, there are vehicles that spread salt on the icy road. Why do they do so?

a)

Salt is used to melt the accumulated ice on the road

b)

Salt increase the melting point of ice

c)

Salt lowers the melting point of ice

2.

One molecule of water consists of

a)

one atom of oxygen and one atom of hidrogen

b)

two atoms of oksigen and one atom of hidrogen

c)

two atoms of nitrogen and one atom of oxygen

d)

two atoms of hydrogen and one atom of oxygen

3.

Which of the statements below are true

a)

The higher the humidity of the air is, the higher the rate of evaporation will be

b)

The higher the surrounding temperature is, the higher the rate of evaporation will be

c)

The faster the movement of air is, the lower the rate of evaporation will be

d)

The bigger the exposed surface area is, the higher the rate of evaporation will be

4.

What gas that released in the test tube P?

(a)  

5.

What is the ratio of oxygen to hydrogen in the electrolysis of water?

a)

2:1

b)

2:3

c)

1:2

d)

1:1

6.

Which of the following factors will cause a wet towel to dry faster ?

a)

Hot sun

b)

Damp air

c)

Towel folded

d)

Wind

7.

Mark for the correct statement

a)

When gas Q is tested with a burning wooden splinter, a 'pop' sound is produced.

b)

Sulphuric acid is added to distilled water to make the water conduct electricity better

c)

Oxygen is collected at Q

d)

Hidrogen is collected at P

8.

In the electrolysis of water, if the volume of oxygen collected is 10cm3, predict the volume of hidrogen collected?

a)

5cm3

b)

10cm3

c)

15cm3

d)

20cm3

9.

Which of the statements are true about evaporation

a)

occurs at any temperature

b)

happens at the surface of water

c)

changes water into solid

d)

takes place only at the boiling point of water

10.

What happens when a little salt is added to water?

a)

Boil above 100C

b)

Freeze above 0C

c)

Evaporate faster

d)

Become acidic

11.

What is the chemical formula for water

a)

NO2

b)

CO2

c)

H02

d)

H20

12.

True statements about evaporation

a)

Process which water vapour changes to water

b)

A fast process

c)

Occurs at any temperature

d)

Takes place at water surface only

13.

The diagram below shows towel hanging on a rail.

Which of the following factor will cause the clothes to dry faster?

a)

Higher humidity of air

b)

Rainy days

c)

Lower temperature of the surrounding

d)

High speed of wind

14.

What does chlorination do to the water?

a)

kills microorganisms

b)

Cleans the water

c)

Makes the water taste nice

d)

Removes twigs and sediment

15.

Give the meaning of solvent

a)

A homogenus mixture from two or more substances

b)

Substance that dissolves in other substances

c)

Solids that do not dissolve in liquids

d)

Substance that dissolves other substances

16.

Give the meaning of solution

a)

A homogenus mixture from two or more substances

b)

Substance that dissolves in other substances

c)

Solids that do not dissolve in liquids

d)

Substance that dissolves other substances

17.

Give the meaning of solute

a)

A homogenus mixture from two or more substances

b)

Substance that dissolves in other substances

c)

Solids that do not dissolve in liquids

d)

Substance that dissolves other substances

18.

What is these phrases suspended particles means

a)

A homogenus mixture from two or more substances

b)

Substance that dissolves in other substances

c)

Solids that do not dissolve in liquids

d)

Substance that dissolves other substances

19.

Ensure the following mixture is

a)

solvent

b)

solution

c)

suspension

d)

colloid

20.

Ensure the following mixture is

a)

solvent

b)

solute

c)

suspended particles

d)

suspension

21.

Ensure the following mixture is

a)

solution

b)

suspension

c)

colloid

d)

substance

22.

Ensure the following mixture is

a)

Solute

b)

solvent

c)

solution

d)

colloid

23.
What word describes when water is attracted to other substances?
a)
cohesion
b)
adhesion
c)
capillary action
d)
surface tension
24.
The attraction that causes water and other liquids to form drops is called ________________. This is also water’s ability to be attracted to other water molecules.
a)
adhesion
b)
capillary action
c)
cohesion
d)
surface tension
25.

In the above picture, a powder is about to be poured into the liquid. Which of the following should be done to make this powder dissolve faster?

a)

stir the powder in the liquid

b)

set the liquid at lower temperature

c)

replace the powder with same material but in cubes

d)

store the mixture in a dark place

26.

A solution that is considered dilute would be....

a)

Dark in color

b)

Have more than maximum amount of solute that can dissolve

c)

Have a large amount of solute

d)

Have a small amount of solute

27.

When a solvent contains as much of the solute as it can hold, the solution is said to be

a)

concentrated

b)

diluted

c)

saturated

d)

unsaturated

28.

A solution in which no more solute can be dissolved.

a)

supersaturated

b)

saturated

c)

concentrated

d)

dilute

29.

Which of the following usually makes a substance dissolve faster in a solvent?

a)

Stirring

b)

Raising the temperature

c)

Increasing the surface area

d)

All the other answers are correct

30.
What two elements make up water?
a)
Helium and oxygen
b)
Hydrogen and oxygen
c)
helium and carbon
d)
oxygen and carbon
31.

Water is a universal solvent because it...

a)

It can be found anywhere

b)

Dissolves just a few substances

c)

Dissolves all substances

d)

Dissolves most substances

32.
Which end of the water molecule has a slightly positive charge?
a)
the oxygen end
b)
the hydrogen end
c)
both ends are slightly positive
d)
neither end is positive
33.
Which statement correctly describes the 2 electrodes?
a)
The anode is negative and the cathode is positive
b)
The anode and cathode are both positive
c)
The anode is positive and the cathode is negative
d)
The anode and cathode are both negative.
34.
What is the chemical formula for water?
a)
2HO
b)
H2O
c)
HO2
d)
H2O2
35.
Which letter represents hydrogen?
a)
A
b)
B
c)
C
d)
D
36.
Why can some insects walk on water?
a)
The water sticks to the insect.
b)
The insect is too light to break the surface tension.
c)
The insect has hydrophobic oils on its legs.
d)
Insects can't walk on water.
37.

We can prevent water pollution by:

a)

Reduce the use of plastic.

b)

Properly dispose of chemicals.

c)

Clean up after your animals.

d)

All of the above

38.

Humidity is...

a)

how fast air moves

b)

the amount of water vapor in the air

c)

the amount of heat in the air

d)

the amount of water surface expose to the air

39.

Physical properties of water

a)

Density is 1gcm-1

b)

Boiling poin is 100oC

c)

Freezing point is 0oC

d)

White in color

40.

Physical properties of pure water

a)

Colourless

b)

Odourless

c)

Tasteless

d)

Melting point is 0oC

41.

Adhesive force between water molecules causes water to have high surface tension

a)

True

b)

False

42.

Capillary action is due to the adhesive force between water molecules and cohesive force between xylem's wall and water molecules

a)

True

b)

False

43.

Name process A

(a)  

44.

Name process B

(a)  

45.

Name the process C

(a)  

46.

Name the process D

(a)  

47.

what is X

(a)  

48.

Thick the correct statements about colloid

a)

The small particles in colloid evenly distributed throughout the solution

b)

Colloid appears clear

c)

Sediment is observed when colloid was left to stand for a while

d)

Milk is an example of colloid

49.

(a)   enables a daddy longlegs to float on the surface of water

50.

Examples of emulsion

a)

Cod liver oil

b)

Bath sponge

c)

Fresh milk

d)

shaving foam

e)

Whipped cream

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