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Worksheets

Year 7 chemistry

Total questions: 47

Worksheet time: 33mins

Name
Class
Date
1.

What is the hazard shown in this hazard sign?

a)

Explosive

b)

Corrosive

c)

Irritant

d)

High level Irritant

2.
What colour is universal indicator in a strong alkali?
a)
Green
b)
Orange
c)
Purple
d)
Red
3.
What colour is universal indicator in a neutral solution?
a)
Green
b)
Orange
c)
Purple
d)
Red
4.
What colour is universal indicator in strong acid?
a)
Green
b)
Orange
c)
Purple
d)
Red
5.

Strong acids and strong alkalis are.......

a)

Able to turn blue litmus paper red

b)

Corrosive

c)

Sour

d)

Sweet

6.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
7.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
8.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
9.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
10.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
11.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
12.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
13.

Bleach is a strong alkali, what is the pH level of bleach?

a)

13

b)

10.5

c)

1

d)

2

14.

Acid + Alkali --> Salt + Water

a)

neutralization reaction

b)

synthesis

c)

decomposition

d)

single displacement

15.
A neutralization reaction will always produce...
a)
water & salt
b)
water
c)
salt
d)
water & carbon
16.

Indicator that only changes colour at pH = 7

a)

Universal indicator

b)

Litmus paper

17.

Acids taste _________________.

a)

sour

b)

spicy

c)

sweet

d)

bitter

18.

The image shows a PH scale. Which option indicates strong alkali?

a)

a

b)

b

c)

c

d)

d

19.

The image shows a PH scale. Which option indicates strong acid?

a)

a

b)

b

c)

c

d)

d

20.

The pH scale is a range from:

a)

1-7

b)

0-14

c)

1-20

21.

What is the substance with a neutral pH of 7?

a)

Milk

b)

Water

c)

Orange Juice

d)

Blood

22.

Which substance is alkali?

a)

Toothpaste

b)

Lemon juice

c)

Vinegar

d)

Soft drink

23.

Which substance is acid?

a)

Ammonia

b)

Toothpaste

c)

Vinegar

d)

Soap

24.

Which pH levels indicated a strong acid?

a)

1-3

b)

4-6

c)

8-11

d)

12-14

25.

Alkalis feel...

a)

Rough

b)

Soapy

c)

Granulated

d)

Smooth

26.

Which of the following acids do we have in our stomach?

a)

Ethanoic acid

b)

Hydrochloric acid

c)

Nitric acid

d)

Sulphuric acid

27.

The image shows a PH scale. Which option indicates strong alkali?

a)

a

b)

b

c)

c

d)

d

28.

The image shows a PH scale. Which option indicates strong acid?

a)

a

b)

b

c)

c

d)

d

29.

What is the substance with a neutral pH of 7?

a)

Milk

b)

Water

c)

Orange Juice

d)

Blood

30.

Which substance is acid?

a)

Ammonia

b)

Toothpaste

c)

Vinegar

d)

Soap

31.

Alkalis feel...

a)

Rough

b)

Soapy

c)

Granulated

d)

Smooth

32.

What is the meaning of the word 'acid'?

a)

Sour

b)

Bitter

c)

The ashes

d)

burn

33.

What does the word 'alkali' means

a)

bitter

b)

The ashes

c)

sour

d)

burn

34.

These house hold items were made of ____________.

a)

acids

b)

alkalis

35.

What is the colour of litmus solution?

a)

blue

b)

purple

c)

green

d)

pink

36.

A purple colour when using universal indicator indicates the solution is _______________.

a)

neutral

b)

acidic

c)

alkali

d)

blackcurrant juice

37.

What is the range of pH scale?

a)

0 -14

b)

1 - 14

c)

1 - 6

d)

12 - 14

38.

An alkali is able to “cancel” out an acid. This process is also known as?

a)

balancing

b)

extraction

c)

overcome

d)

neutralisation

39.

What colour does litmus paper turn when added to an alkali?

a)

Blue

b)

Red

c)

Green

d)

Colourless

40.

What happens to the pH of an acid during neutralisation?

a)

It stays the same

b)

It moves toward pH 1

c)

It moves towards pH 7

d)

It moves towards pH 14

41.

Which substance is an acid?

a)

Water

b)

Bleach

c)

Orange juice

d)

Washing powder

42.
Which type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?
a)
Water
b)
Carbon Dioxide 
c)
Dry Chemical
d)
Foam
43.
Another term for burning is
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
44.
Are the molecules in wood the same as ash 
a)
yes 
b)
depends 
c)
does it matter 
d)
no
45.

What does this hazard symbol warn of?

a)

The substance is explosive

b)

The substance burns easily

c)

The substance supplies oxygen to fires

d)

The substance puts out fires

46.

What does incomplete combustion produce that complete combustion doesn't?

a)

Carbon Monoxide

b)

Water

c)

Heat

d)

Carbon Dioxide

47.

What are the types of combustion?

a)

Complete and incomplete

b)

Incomplete and inexact

c)

Impossible and possible

d)

Computer and incomplete

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