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Science Form 2: Water and Solution

Total questions: 40

Worksheet time: 22mins

Name
Class
Date
1.

Water has a high surface tension. Surface tension is a result of ______________________________ between the molecules of water at the surface that allows insects like daddy longlegs to stay afloat on the water.

a)

attractive force

b)

repulsive force

c)

cohesive force

d)

capillary force

2.

Adhesive force between water molecules and cell walls of ______________________ allow water to be drawn up from the roots to the leaves of plants. this phenomenon is known as capillary action.

a)

xylem

b)

floem

c)

tube

d)

vessel

3.

Water molecule is made of ___________ of hydrogen and __________________ atom of oxygen.

a)

one , two

b)

three , two

c)

two , one

d)

two , two

4.

Sublimation is a process of changes in the state of matter from ___________________________________________

a)

gas to solid

b)

solid to liquid

c)

liquid to gas

d)

gas to liquid

5.

These two processes absorbs heat energy during the changes in the state of matter.

a)

freezing and evaporation

b)

evaporation and condensation

c)

boiling and melting

d)

freezing and condensation

6.

During electrolysis the ___________________ gas is produced at the anode

a)

oxygen

b)

hydrogen

7.

During the electrolysis the ________________ gas is produced at cathode.

a)

oxygen

b)

hydrogen

8.

The impurities such salt when added to water will _______________ the freezing point of water.

a)

increase

b)

remain the same

c)

decrease

9.

The impurities such as sugar or salt will _____________________________________ the boiling point of the water.

a)

increase

b)

remain the same

c)

decrease

10.

One of the characteristic below does not affect the rate of evaporation :

a)

humidity

b)

colour of the water

c)

total surface area of the water

d)

surrounding temperature

e)

movement of air speed

11.

Name two applications of evaporation of water:

a)

dried seafood

b)

obtaining sea salt

c)

soaking fruits in salt

d)

hydroelectric generation

12.

_________________________ is a substance that can dissolve in a liquid

a)

solute

b)

solvent

c)

solution

13.

________________________ is a liquid that dissolves a substance

a)

solute

b)

solvent

c)

solution

14.

______________________ is the mixture formed when a solute

dissolves in a solvent.

a)

solute

b)

solvent

c)

solution

15.

A ____________________________________ IS A CLOUDY MIXTURE FORMED FROM UNDISSOLVED SOLUTE PARTICLES IN A SOLVENT

a)

solute

b)

colloid

c)

suspension

d)

solubilty

16.

___________________________ method is not a water purification method.

a)

mixing salt

b)

boling water

c)

chlorination

d)

filtration

17.

Based on the diagram above these are the reasons why the water pollution occur except for _________________________

a)

using water filter at home

b)

using chemicals in agriculture

c)

using chemicals in industries and industrial waste

d)

domestic waste released to the river

18.

Answer true or false,

River water and sewage are natural water resources

a)

true

b)

false

19.

Answer true or false,

Alum and slaked lime are added in the coagulation tank

a)

true

b)

false

20.

Answer true or false,

Chlorination can remove impurities in the water

a)

true

b)

false

21.

Arrange the stages involved in the water purification system

a)

coagulation, sedimentation, oxidation, flouridation

b)

filtration,sedimentation, coagulation, chlorination

c)

filtration, coagulation, sedimentation, chlorination

d)

sedimentation, coagulation, filtration, chlorination

22.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
23.
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)
freeze the mixture
c)
add more powder to the liquid
d)
store the mixture in a dark place
24.
A solution that is considered dilute would be....
a)
Dark in color
b)
Have a strong scent
c)
Have a large amount of solute
d)
Have a small amount of solute
25.
When a solvent contains as much of the solute as it can hold, the solution is said to be
a)
supersaturated
b)
diluted
c)
saturated
d)
unsaturated
26.

It is a maximum amount of solute that is soluble in 100 cm³ of solvent at a specific temperature.

This statement refers to

a)

Solute

b)

Solution

c)

Solubility

d)

Solvent

27.

Diagram shows a UHT milk. It is example of ...

a)

Suspension

b)

Solute

c)

Colloids

28.

Diagram shows experiment to study the effect if stirring and without stirring salts to its rate of solubility in water. Both beaker contain 100 cm³ of water.

What is the manipulated variable?

a)

Rate of solubility

b)

Temperature

c)

Volume if water

d)

Stirring and not stirring process

29.

In which beaker does salt dissolves faster?

a)

Hot water

b)

Room temperature

c)

Ice watet

30.

Why does salt dissolves faster in hot water?

a)

Hot water hive high kinetic energy to solvent and solute perticles

b)

More collision between solute and solvent particles

c)

Higher temperature gives more surgace area to the solute

31.

Why fine salt dissolves faster bin water compared to coarse salt?

a)

Fine salt has bigger total surface area exposed to water

b)

Fine salt has smaller total surgace arra exposed to water

32.

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

33.

Ensure the following mixture is

a)

solvent

b)

solution

c)

suspension

d)

colloid

34.

What is the best way to purify water?

a)

Add salt

b)

Put inside the refrigerator

c)

Filtration or Boiling

d)

Find a very clean stream of water

35.

improved water quality can be achieved by

a)

appropriate use of water

b)

careful water storage and handling

c)

proper land management

d)

all of the above

36.
What does chlorination do to the water?
a)
Removes microorganisms
b)
Cleans the water
c)
Makes the water taste nice
d)
Removes twigs and sediment
37.

An example of solute is _________

a)

sand

b)

milk

c)

sugar

38.

___________ dissolves easily in water.

a)

Honey

b)

Soil

c)

Salt

39.

Chalk powder is insoluble in water.

a)

True

b)

False

40.

They do not dissolve in water.

a)

Oil

b)

Baking powder

c)

Petrol

d)

Soil

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