Free Printable Y8 Chemistry chemical and physical changes

Free Printable Worksheets

Worksheets

Y8 Chemistry chemical and physical changes

Total questions: 80

Worksheet time: 1hrs 1mins

Name

Class

Date

1.

Contains components that are not chemically combined

a)

Element

b)

Compound

c)

Mixture

2.

Cannot be broken down

a)

Element

b)

Compound

c)

Mixture

3.

Two or more elements chemically combined

a)

Element

b)

Compound

c)

Mixture

4.

Can be separated easily

a)

Element

b)

Compound

c)

Mixture

5.

Has a formula

a)

Element

b)

Compound

c)

Mixture

6.

Has a symbol

a)

Element

b)

Compound

c)

Mixture

7.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

8.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

9.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

10.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

11.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

12.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

13.

Is boiling water a physical or chemical change?

a)

Physical

b)

Chemical

14.

Is frying an egg a physical or chemical change?

a)

Physical

b)

Chemical

15.

Is dissolving salt in water a physical or chemical change?

a)

Physical

b)

Chemical

16.

Is combining magnesium metal and acid to produce hydrogen gas a physical or chemical change?

a)

Physical

b)

Chemical

17.

Is bleaching hair a physical or chemical change?

a)

Physical

b)

Chemical

18.

Is mixing paint colours a physical or chemical change?

a)

Physical

b)

Chemical

19.

Evidence of a physical change.

a)

New substance

b)

Shape Change

c)

Light produced

d)

Gas released.

20.

Any change in the state of matter of a substance is a...

a)

Physical Change

b)

Chemical Change

21.

Which of the following are examples of a Chemical Change?

a)

Iron Rusting

b)

Gas Burning

c)

Breaking a glass

d)

Boiling water

e)

Burning Wood

22.

What is a chemical change?

a)

Forming a new substance

b)

When two or more substances combine to make a greater one

c)

When two or more substances combine to make a new chemical substance

d)

Combing substances

23.

Which of the following would be considered a physical property?

a)

Colour

b)

Flammability

c)

pH

d)

Reactivity

24.

Flammability

a)

Physical property

b)

Chemical property

25.

Bitter taste

a)

Physical property

b)

Chemical property

26.

Melting point

a)

Physical property

b)

Chemical property

27.

Boiling point

a)

Physical property

b)

Chemical property

28.

Red color

a)

Physical property

b)

Chemical property

29.

Which is an example of a chemical change?

a)

baking a cake

b)

freezing water

c)

crushing a can

d)

breaking an egg

30.

Which example best describes a physical change?

a)

iron rusting

b)

charcoal burning

c)

an ice cube melting

d)

a marshmallow burning

31.

When coffee is poured into a cup of ice, the ice begins to melt and mix with the coffee. Which statement best describes this change?

a)

The ice melting is a chemical change because the water changes form.

b)

The ice melting is a physical change because the water may be frozen again.

c)

The water and coffee mixing is a chemical change because the liquids change color.

d)

The water and coffee mixing is a physical change because the mixture forms bubbles.

32.

A physical change _____________ the identity of the substance.

a)

changes

b)

maintains

33.

A chemical change _____________ the identity of the substance.

a)

changes

b)

maintains

34.

Which of these is NOT a PROPERTY of matter?

a)

size

b)

color

c)

shape

d)

quantity

35.

Why is a mixture a physical change?

a)

It creates a new substance

b)

It has multiple ingredients

c)

It can be separated

36.

Which of the following is NOT an indication of a chemical change?

a)

production of light

b)

production of gas

c)

production of odor

d)

production of water

37.

A student heats a beaker of water with a hot plate and over time, the water begins to bubble, the volume decreases and vapor is visible. This is an example of a ____________ change.

a)

Chemical

b)

Nuclear

c)

Physical

d)

Musical

38.

Cutting a tree limb into logs is (a)____________ and burning them in the fireplace is (b)____________.

a)

(a) A Physical Change

(b) Also a Physical Change

b)

(a) A Physical Change

(b) A Chemical Change

c)

(a) A Chemical Change

(b) Also a Chemical Change

d)

(a) A Chemical Change

(b) A Physical Change

39.

When lithium metal is dropped into a container of water, the lithium sparks and fizzes and the water begins to bubble violently. The conclusion that can be drawn from that is:

a)

A new substance is created because this is a chemical change.

b)

No new substances are created because there is a chemical change.

c)

No new substances are created because this is a physical change.

d)

A new substance is created because this is a physical change.

40.

In this example, there is no gas produced, no temperature change, no odor, and no solids formed. This must be a _________ change.

a)

Physical

b)

Emotional

c)

Hypothetical

d)

Chemical

41.

A white crystalline powder is mixed with water. No temperature change is observed but the solid disappears. This must be a __________ change.

a)

Chemical

b)

Mechanical

c)

Physical

d)

Electrical

42.

Which of the following is a chemical change?

a)

Mixing two clear liquids and forming a blue liquid

b)

Mixing a clear liquid and white solid and getting a clear liquid

c)

Mixing a clear liquid and a dark purple solid and getting a light purple liquid

d)

Mixing a clear liquid with a white solid and getting a cloudy white liquid

43.

True or false: The only chemical changes that generates light are ones that explode or generate flames.

a)

True

b)

False

44.

This is a _____________ change.

a)

Chemical

b)

Physical

45.

This is a __________ change.

a)

Physical

b)

Metaphysical

c)

Chemical

d)

Logical

46.

This is a _________ change.

a)

Magical

b)

Chemical

c)

Physical

d)

Seussical

47.

Sodium Hydroxide dissolves in water

a)

Chemical Change

b)

Physical Change

48.

Grass growing in a lawn

a)

Chemical Change

b)

Physical Change

49.

Which process is a sign of a chemical change?

a)

A rotting potato gives off a bad smell

b)

A melting block of ice leaves a large puddle

c)

A cloud quickly changes shape when blown by wind

d)

A plaster statue breaks when it falls onto the floor

50.

What happens in ALL chemical changes?

a)

Change in state of matter

b)

A new substance is formed

c)

Bubbles are produced

d)

An explosion

51.

What is a solute?

a)

The substance that does the dissolving in a solution.

b)

The substance that is dissolved into the solution.

c)

The mixing of different substances.

d)

The process in which neutral molecules lose or gain electrons

52.

The thing that does the dissolving

a)

Solute

b)

Solvent

c)

Colloid

d)

Solution

53.

What is the left part of a chemical equation called?
2H_{2 +}O₂ --> 2H₂O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

54.

What is the right part of a chemical equation called...
2H_{2 +}O₂ --> 2H₂O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

55.

How many Aluminum are in Al₂O₃?

a)

3

b)

2

c)

5

56.

How many Sodium (Na) are in 6NaCl?

a)

1

b)

12

c)

6

57.

How many Hydrogen are in 4H₂O?

a)

6

b)

8

c)

2

d)

4

58.

Which letters show the Reactants in the following chemical equation: A + B --> C

a)

-->

b)

C

c)

A + B

d)

A

59.

The example of an iron train getting rusted, forming iron oxide, is an example of chemical change.

a)

True

b)

False

60.

A process in which atoms rearrange to form new substances.

a)

extended structure

b)

boiling point

c)

chemical reaction

61.

In a chemical equation the reactants are on the left side of the arrow. Are the reactants the beginning substances or the ending substances?

a)

beginning

b)

ending

62.

In a chemical equation the products are on the right side of the arrow. Are the products the beginning substances or the ending substances?

a)

beginning

b)

ending

63.

During a chemical reaction, atoms can

a)

be destroyed to form a new substance

b)

be created to form a new substance

c)

be rearranged to form a new substance

64.

A group of atoms joined together in a particular way

a)

product

b)

molecule

c)

fertilizer

65.

The hydrogen peroxide is decomposed in the presence of manganese dioxide into .......

a)

water and hydrogen

b)

water and oxygen

c)

oxygen and hydrogen

66.

Iron oxide is formed as a result of combination between.......

a)

iron and hydrogen

b)

iron and oxygen

c)

iron and carbon dioxide

67.

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

a)

Respiration

b)

Produce

c)

Photosynthesis

d)

Breathing

68.

A gas produced by animals during respiration is

a)

Oxygen

b)

Hydrogen gas

c)

Carbon dioxide

d)

Water vapor

69.

What is the percentage existence of oxygen gas in air?

a)

%78

b)

%32

c)

%18

d)

%21

70.

carbon dioxide gas is prepared by adding diluted hydrochloric acid to ..............

a)

calcium oxide

b)

calcium carbonate

c)

calcium hydroxide

71.

How can carbon dioxide be made in the cup?

a)

Reaction between vinegar and bicarbonate of soda

b)

Reaction between vinegar and carbon dioxide

c)

Reaction between bicarbonate of soda and water

72.

Which gas causes a flame to be extinguished?

a)

Oxygen

b)

Carbon Dioxide

c)

Hydrogen Gas

73.

Which is not a property of carbon dioxide?

a)

It is a colorless gas

b)

It supports combustion

c)

It is denser than air

d)

It is an odorless gas

74.

Which is a use of carbon dioxide

a)

used in respiration

b)

used for life support

c)

used in fire extinguishers

d)

used to make fertilizers

75.

how many atoms make up a molecule of carbon dioxide ( CO₂)?

a)

1

b)

2

c)

3

d)

4

76.

Air is heavier than CO₂ gas.

a)

True

b)

False

77.

The rapid combination of oxygen and wood, producing heat and light is called......

a)

combustion

b)

respiration

c)

oxidation

78.

How to produced hydrogen gas?

a)

Metal + water

b)

Metal + acid

c)

Metal + metal

d)

Acid + acid

79.

How to make sure that the gas produced is hydrogen?

a)

Using lighted splint "pop" sound

b)

Using lighted splint with no sound

80.

Hydrogen is odorless, colorless and tasteless gas

a)

True

b)

False

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