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S.1 CHEMISTRY TERM 3 2025

Total questions: 96

Worksheet time: 2hrs 30mins

Name
Class
Date
1.

________________ are reversible and have some of the properties of their substance change

a)

Physical changes

b)

Chemical changes

c)

Reactants

d)

Products

2.

_______________ are irreversible and have one or more new substances formed

a)

Physical changes

b)

Chemical changes

c)

Reactants

d)

Products

3.

The signs of a chemical change are

a)

Temperature change

b)

Gas is produced

c)

Colour change

d)

Precipitate

e)

All of the above

4.

A precipitate is

a)

When a gas is produced (usually also producing bubbles)

b)

The smallest particle of an element

c)

A solid formed from two solutions

d)

A metal which is malleable

5.

Sodium + water -----> Sodium hydroxide +hydrogen


The product/s are

a)

Sodium

b)

Sodium + water

c)

Sodium hydroxide

d)

Sodium hydroxide + hydrogen

6.

Iron + oxygen ----> Iron oxide


The reactant/s are

a)

Iron

b)

Iron + oxygen

c)

Iron oxide

d)

Iron + oxygen ---> Iron oxide

7.

Which of the following is an example of a wanted chemical reaction?

a)

Cesium reacted with water

b)

Digestion

c)

Acid rain

d)

Chemical weapons

8.

Which of the following is not an example of a physical change?

a)

Sour milk

b)

Dissolving sugar and water

c)

Chopping wood

d)

Boiling water

9.

Which of the following is a chemical change?

a)

Shredding paper

b)

Breaking a glass

c)

Baking a cake

d)

Melting an ice cube

10.

Which of the following is not an example of a chemical change?

a)

Melting of butter

b)

Burning a piece of paper

c)

Rusting of iron

d)

Fireworks

11.

What are the two characteristics of matter?

a)

has mass and length

b)

has elements and mixtures

c)

length and width

d)

mass and takes up space

12.

Which of the following do you think is s pure substance?

a)

Gold

b)

Al

c)

kool-aid

d)

milk

13.

Which of these substances can be a compound?

a)

CO2

b)

C

c)

O2

d)

Ar

14.

What is a pure substance that cannot be broken down chemically into simpler substances?

a)

mixture

b)

element

c)

compound

d)

formula

15.

An Element is made up of how many types of atoms?

a)

12

b)

36

c)

58

d)

1

16.

Choose the option that cannot be a chemical symbol.

a)

a

b)

H

c)

O

d)

Cl

17.

What is the result of a CHEMICAL change?

a)

mixture

b)

element

c)

compound

d)

pure substance

18.

Which is NOT a compound?

a)

CO2

b)

H2O

c)

S

d)

SiO2

19.

This diagram represents a model of

a)

an element

b)

a compound

c)

an atom

d)

a mixture

20.

Of the four boxes shown, which ones represent a model of elements only?

a)

A and C

b)

A, C and D

c)

B and D

d)

B and C

21.

Which one of the following diagrams represents a mixture of an element and a compound?

a)

C

b)

B

c)

A

d)

D

22.

This is an image of a(n)...

a)

Element

b)

Compound

c)

Mixture

23.

This is an image of a(n)...

a)

Element

b)

Compound

c)

Mixture

24.

This is an image of a(n)...

a)

Element

b)

Compound

c)

Mixture

25.

This is an image of a(n)...

a)

Element

b)

Compound

c)

Mixture

26.

This is an image of a(n)...

a)

Element

b)

Compound

c)

Mixture

27.

A pure substance that consists of only ONE type of atom.

a)

Elements

b)

Compounds

c)

Mixtures

28.

A pure substance that consists of TWO or MORE different kinds of atoms chemically combined.

a)

Elements

b)

Compounds

c)

Mixtures

29.

A substance made up of a random physical combination of elements and/or compounds.

a)

Elements

b)

Compounds

c)

Mixtures

30.

Which substance is EASIER to separate because it is only a physical combination?

a)

Compounds

b)

Mixtures

31.

Which substance is HARDER to separate because it is a chemical combination?

a)

Compounds

b)

Mixtures

32.

What is our topic?

a)

Frational Distillation

b)

Fractional Distilation

c)

Fraction Distillation

d)

Fractional Distillation

33.

What is fractional distillation?

a)

A dangerous experiment

b)

Something

c)

A chemical experiment

d)

A biological experiment

34.

What is the most important feature in fractional distillation?

a)

The two component part must have different boiling point

b)

The two component part must have similar boiling point

c)

The two component part must have same boiling point

35.

When you heat up the chemical compound, they will both evaporate at the same time.

a)

True

b)

Maybe

c)

I don’t know

d)

False

36.

Why do we need to create a open space between the condenser and the beaker with distillate?

a)

To prevent low pressure to form

b)

To prevent the pure water not dropping into the beaker

c)

To prevent high pressure to form

d)

To prevent a fire accident happen

37.

What will you get after fractional distillation? (Can select two or more answers)

a)

Condensed water

b)

Hot water

c)

Non-pure water

d)

Pure water

38.

Can we drink the water after fractional distillation?

a)

No

b)

Yes

c)

Maybe

d)

...

39.

What change of states are included in fractional distillation? (Can select two or more answers)

a)

Melting

b)

Evaporation

c)

Condensation

d)

Freezing

40.

Gasoline and many other chemicals are produced from____ using fractional distillation.

a)

Oil

b)

Crude Oil

c)

Crude Water

d)

Dirty Water

41.

What makes the solution easy to separate?

a)

Difference of boiling point more than 25 degrees

b)

Difference of boiling point exactly 25 degrees

c)

The boiling point is different

d)

Difference of boiling point less than 25 degrees

42.
A leibeg condenser is used in
a)
Filtration
b)
Chromatography
c)
Evaporation
d)
Distillation
43.
Can you separate salt from water using filtration?
a)
yes
b)
no
44.
What is a substance that is dissolved in another substance? 
a)
solution
b)
solute
c)
solvent
d)
compound
45.
Jessica made a pitcher of lemonade. What can she do to dilute if she thinks it doesn't taste right?
a)
Add water
b)
Add sugar
c)
Boil the lemonade
d)
Put it in the refrigerator 
46.
Which one of the following solids is insoluble in water?
a)
sugar
b)
sand
c)
copper sulfate
d)
salt
47.
Dyes in water soluble markers may be separated by means of..
a)
crystallization
b)
sublimation
c)
chromatography
d)
sedimentation
48.
The diagram shows the chromatogram for three colouring dyes and that for a brown marker. What dye(s) are contained in the marker's ink?
a)
purple and green
b)
purple and yellow
c)
purple only
d)
green and yellow
49.
Liquids that do not mix may be separated by using..
a)
an evaporating dish
b)
a separating funnel
c)
a loading
d)
a sedimentation
50.
Salt and water are
a)
compound
b)
mixture
c)
element
d)
solute
51.
If a solid disappears when added to a liquid (like when sugar is stirred in water)... it is said to have...
a)
Formed a solute
b)
Dissolved
c)
Formed a solvent
d)
Become insoluble
52.
KBr
a)
Soluble
b)
Insoluble
53.
Zinc Carbonate
a)
Soluble 
b)
Insoluble 
54.
What are always soluble?
a)
Nitrates
b)
Phosphates
c)
Carbonates
d)
Hydroxides
55.
uniform mixture of two or more substances
a)
solvent
b)
acid
c)
solution
d)
base
56.
What is the precipitate formed when you mix silver nitrate with copper chloride?
a)
copper nitrate
b)
copper chloride
c)
silver chloride
d)
silver nitrate
57.
A mixture is made when two or more substances are combined, but they are not combined chemically.
A mixture is the combination of two or more substances that can be easily separated.
True or False?
a)
False
b)
True
58.
Filtration is a common method of separating an insoluble solid from a liquid. An example of a mixture is sand and water. This process involves the use of a filter paper placed in a filter funnel. The funnel is placed in a beaker and the mixture of water and sand is poured into the funnel. The liquid part drains through the filter paper into the beaker, leaving the solid sand particles trapped on the filter.
Filtration is a common method of separating an insoluble solid from a liquid.
True or False?
a)
True
b)
False
59.
In filtration, the liquid part collected is called the filtrate and the solid bit that remained on the filter paper is called the residue.
 In filtration, what is the part that remains in the filter paper called?
a)
Solid
b)
filtrate
c)
remainder
d)
residue
60.
Evaporation is good for separating a mixture (solution) of a soluble solid and a solvent. The process involves heating the solution until the solvent evaporates (turns into gas) leaving behind the solid residue.
Evaporation is good for separating a mixture (solution) of a soluble solid and a solvent.
True or False?
a)
False
b)
True
61.
To remove the salt from salt water, the easiest thing to do is boil it and evaporate the water.
a)
True
b)
False
62.
Distillation uses two changes of state. what are they?
a)
Evaporation and condensation
b)
Evaporation and freezing
c)
melting and boiling
d)
sublimation and condensation
63.
Simple distillation is best for separating a liquid from a solution. It is similar to evaporation, but the vapor is collected by condensation.
What is the difference between evaporation and distillation?
a)
the vapor is collected by freezing
b)
the vapor is collected by filtration
c)
the vapor is collected by condensation
d)
the vapor is collected by heat transfer
64.
Fractional distillation is similar to simple distillation. It is best for separating a solution of two liquids. (liquids that dissolve in each other). Fractional method takes advantage of the different boiling points of the two liquids. Fractional distillation takes a bit more time than the simple distillation.
Fractional distillation takes less time than the simple distillation.
True or False?
a)
False
b)
True
65.
Magnetism is ideal for separating mixtures of two solids with one part having magnetic properties

How would you separate iron filings mixed with sand?
a)
Evaporation
b)
fractional distillation
c)
filtration
d)
magnetism
66.
If a substance does not dissolve in a solvent, we say that is insoluble
a)
True
b)
False
67.

Which of the following can be considered causes of air pollution?

i) Climate change 

ii) Greenhouse gas emission

iii) Heavy vehicles movement

a)

only (i) and (ii)

b)

(i), (ii) and (ii)

c)

only (i) and (iii)

d)

only (ii) and (iii)

68.

Carbon-monoxide is produced during the process of ________combustion

a)

complete

b)

incomplete

c)

partial

69.

"Air contains ____% of carbon dioxide and is normally not considered as a pollutant" Fill

a)

0.06%

b)

8.24%

c)

0.43%

d)

0.03%

70.

An organic compound that contains carbon, chlorine & fluorine

a)

suspended

particulate matter

b)

Chlorofluorocarbon

c)

sulphur dioxide

d)

Lead

71.

Why is the ozone layer important to all human beings ?

a)

It protects the earth from the sun's ultra-violet rays

b)

It protects the sun form the earths's ultra-violet rays

c)

Both of them

d)

None of them

72.

Suspended particulate matter are the main source of

a)

Smog

b)

Haze

c)

Fog

73.

I am mostly released from the thermal power plants, petroleum industries and oil factories. What am I ?

a)

Suspended Particulate Matter

b)

Lead

c)

Carbon Monoxide

d)

Sulpher Dioxide

74.

Agricultural activities are the largest causes of air pollution. True or False ?

a)

True

b)

False

75.

Any substances in the air that causes harm to living beings and the environment is called as _____

a)

Air Pollutants

b)

Water Pollutants

76.

Some agricultural practices also cause air pollution. True or false

a)

True

b)

False

77.

Which of the following can be considered causes of air pollution?

i) Climate change 

ii) Greenhouse gas emission

iii) Heavy vehicles movement

a)

only (i) and (ii)

b)

(i), (ii) and (ii)

c)

only (i) and (iii)

d)

only (ii) and (iii)

78.

Carbon-monoxide is produced during the process of ________combustion

a)

complete

b)

incomplete

c)

partial

79.

"Air contains ____% of carbon dioxide and is normally not considered as a pollutant" Fill

a)

0.06%

b)

8.24%

c)

0.43%

d)

0.03%

80.

An organic compound that contains carbon, chlorine & fluorine

a)

suspended

particulate matter

b)

Chlorofluorocarbon

c)

sulphur dioxide

d)

Lead

81.

Why is the ozone layer important to all human beings ?

a)

It protects the earth from the sun's ultra-violet rays

b)

It protects the sun form the earths's ultra-violet rays

c)

Both of them

d)

None of them

82.

Suspended particulate matter are the main source of

a)

Smog

b)

Haze

c)

Fog

83.

I am mostly released from the thermal power plants, petroleum industries and oil factories. What am I ?

a)

Suspended Particulate Matter

b)

Lead

c)

Carbon Monoxide

d)

Sulpher Dioxide

84.

Agricultural activities are the largest causes of air pollution. True or False ?

a)

True

b)

False

85.

Any substances in the air that causes harm to living beings and the environment is called as _____

a)

Air Pollutants

b)

Water Pollutants

86.

Some agricultural practices also cause air pollution. True or false

a)

True

b)

False

87.
Oxygen is a living element that humans and animals require to live. 
a)
True 
b)
False
88.
Plants use _____________ to make their own food during photosynthesis.
a)
water
b)
energy from the Sun
c)
CO2
d)
water, energy from Sun, CO2
89.

What is the process of plants taking in carbon dioxide and releasing oxygen called?

a)

Respiration

b)

Produce

c)

Photosynthesis

d)

Breathing

90.

A gas produced by animals during respiration that plants use for photosynthesis.

a)

Oxygen

b)

Toots

c)

Carbon dioxide

d)

Water vapor

91.

Plants and animals are interdependent of each other.

a)

True

b)

False

92.
What goes up but never goes down?
a)
Ruler
b)
Stairs
c)
Your height
d)
Your age
93.
Plants use _____________ to make their own food during photosynthesis.
a)
water
b)
energy from the Sun
c)
CO2
d)
water, energy from Sun, CO2
94.

________________ could increase the amount of oxygen in the air.

a)

Building more houses

b)

Burning more oil

c)

Paving more streets

d)

Planting more trees

95.
Which statement is an example of how plants and animals depend on each other?
a)
animals provide food for plants
b)
animals provide water for plants
c)
animals provide oxygen for plants
d)
animals provide carbon dioxide for plants
96.
Animals use oxygen for _____________.
a)
breathing
b)
creating food
c)
making glucose
d)
transpiration

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