Free Printable Science G4 Unit 3 | 3.4 Chemical reactions

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Worksheets

Science G4 Unit 3 | 3.4 Chemical reactions

Total questions: 40

Worksheet time: 22mins

Name

Class

Date

1.

When a substance changes form but the type of substance does not change is called __________.

a)

Physical change

b)

Chemical change

c)

Physical

d)

Chemical

2.

When substances that are mixed together change and make a new substance is called __________.

a)

Physical change/process

b)

Chemical reaction/change

c)

Physical

d)

Chemical

3.

Tick some statements that are TRUE about chemical reactions.

a)

Physical change and chemical change are the same processes of change of states.

b)

Chemical reactions make new substances form.

c)

A chemical reaction can happen with only one substance.

d)

We cannot undo a chemical reaction.

e)

We need heat for chemical reactions to happen.

4.

How can we know if chemical reactions happen?

a)

There should be heat energy to make it activated.

b)

Chemical reactions make new substances form.

c)

Chemical reactions can happen with only one substance.

d)

We should undo a chemical reaction to check the process.

5.

When we mix baking powder with vinegar, how can we know the chemical reaction takes place?

a)

Because it changes its taste

b)

Because there are new substances form (gas)

c)

Because it changes color

d)

Because it changes its smell

6.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

7.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

8.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

9.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

10.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

11.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

12.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

13.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

14.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

15.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

16.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

17.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

18.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

19.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

20.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

21.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

22.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

23.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

24.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

25.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

26.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

27.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

28.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

29.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

30.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

31.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

32.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

33.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

34.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

35.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

36.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

37.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

38.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

39.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

40.

This picture shows an example of __________.

a)

Physical change/process

b)

Chemical reaction/change

100 %

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