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Revision: C5-Chemical Changes

Total questions: 40

Worksheet time: 13mins

Name
Class
Date
1.
Which of the following pH numbers indicates a neutral substance?
a)
1
b)
5
c)
7
d)
14
2.
Which of the following pH numbers indicates a strong acid?
a)
1
b)
5
c)
7
d)
14
3.
Which of the following pH numbers indicate a strong alkali?
a)
1
b)
5
c)
7
d)
14
4.
What colour does pH paper turn when added to an alkali?
a)
Blue/Purple
b)
Red/orange
c)
Green
d)
Colourless
5.
What substance could you use to test if a substance is an acid or alkali?
a)
Indicator
b)
Salt
c)
Catalyst
d)
Water
6.
Which of the following substances is the strongest acid?
a)
soda, pH 3
b)
tomatoes, pH 4.5
c)
 stomach acid, pH 2
d)
coffee, pH 5
7.
What salt is produced if you react sodium hydroxide with hydrochloric acid?
a)
sodium hydroxide
b)
sodium sulfate
c)
sodium nitrate
d)
sodium chloride
8.
A salt is formed when nitric acid combines with sodium hydroxide. What is the name of the salt?
a)
Sodium chloride
b)
Sodium nitrate
c)
Hydrogen Nitrate
d)
Nirate
9.
Why must chemical equations be balanced?
a)
So that the equation doesn't explode
b)
The reaction won't happen until it is balanced
c)
Matter cannot be created or destroyed
d)
None of these
10.
a)

PH scale

b)

pH ruler

c)

pH scale

d)

pH statistical tables

11.

What pH range would you get for an acid?

a)

0-6

b)

7

c)

7-14

d)

2-10

12.

Strong acids and alkalis are...

a)

Sour

b)

Sweet

c)

Corrosive/Caustic

d)

Burn litmus paper

13.

Acids taste...

a)

Sweet

b)

Salty

c)

Sour

d)

Smooth

14.

Which pH level indicates a weak acid?

a)

1-3

b)

4-6

c)

8-11

d)

12-14

15.

Which pH levels indicated a strong acid?

a)

1-3

b)

4-6

c)

8-11

d)

12-14

16.

Which pH level indicates a strong alkali?

a)

1-3

b)

4-6

c)

8-11

d)

12-14

17.

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

18.

Vinegar is an example of:

a)

An acid.

b)

A base.

c)

Neither an acid nor a base.

19.

Vinegar and fruit juice are examples of:

a)

strong acids

b)

strong bases

c)

strong bases

d)

weak acids

20.

Neutral solutions have a pH of:

a)

0

b)

1

c)

7

d)

14

21.

Which is true?

a)

pH of less than 7 is basic; pH of more than 7 is acidic

b)

pH of less than 7 is acidic; pH of more than 7 is basic

22.

Which of the following statements is true concerning acids and bases?

a)

acids and bases don't react with each other

b)

acids mixed with bases neutralise each other

c)

acids mixed with bases make stronger bases

d)

acids mixed with bases make stronger acids

23.
A _________ acid has a higher pH (Still below 7). The concentration of H+ is lower and acid is not fully dissociated into its ions.
a)
weak
b)
ore
c)
reduction
d)
salt
e)
precipitate
24.
A ______________ acid has a low pH. This means concentration of H+ is high and acid is fully dissociated into its ions.
a)
strong
b)
weak
c)
carbon
d)
dilute
e)
nitric
25.
A solution with low concentration of solute and high amount of solvent is said to be a _____________ solution.
a)
dilute
b)
oxidised
c)
reduction
d)
gain
e)
HCl
26.
________________ are chemicals that release H+ ions into solution when in the presence of water
a)
acids
b)
carbon
c)
loss
d)
displacement
e)
precipitate
27.

Metal oxide + acid -->

a)

salt + water

b)

salt + oxygen

c)

salt + hydrogen

d)

salt + water + carbon dioxide

28.

metal + acid -->

a)

salt + hydrogen

b)

salt + water

c)

salt + carbon dioxide

29.

acid + base -->

a)

salt + water

b)

salt + oxygen

c)

salt + carbon dioxide

30.

When an acid and a base react, a ______________ reaction takes place.

a)

Displacement

b)

Oxidation

c)

Neutralisation

d)

Transamination

31.

H2SO4 + CuO -->

a)

CuSO4 + O2

b)

CuSO4 + H2O

c)

CuSO4 + CO

32.

Acids are substances which produce________ when you add them to water.

a)

H

b)

OH

c)

H+

d)

OH-

33.
H2SO4 is the Formula for __________________ acid
a)
sulphuric
b)
oxidised
c)
loss
d)
gain
e)
nitric
34.
HNO3 is the formula for ____________ acid
a)
nitric
b)
carbon
c)
hydrogen
d)
displacement
e)
acids
35.
Base + ____________ -> salt + water
a)
acid
b)
ore
c)
reduction
d)
gain
e)
HCl
36.

Which of the following statements is true concerning acids and bases?

a)

acids and bases don't react with each other

b)

acids mixed with bases neutralise each other

c)

acids mixed with bases make stronger bases

d)

acids mixed with bases make stronger acids

37.
A neutralisation reaction is a reaction between 
a)
Acid and a Base 
b)
Acid and water 
c)
Base and water 
d)
None of the above 
38.
An acid reacts with metal to produce 
a)
Carbon dioxide 
b)
Hydrogen gas
c)
Hydrogen gas and water 
d)
Salt and hydrogen gas 
39.
An acid reacts with a metal carbonate to produce 
a)
Salt, water and hydrogen gas
b)
Salt, water and carbon dioxide
c)
Limewater
d)
Salt and water 
40.
Complete the following reaction:
Hydrochloric acid + magnesium hydroxide --> 
a)
Magnesium chloride + water 
b)
Magnesium + water
c)
Magnesium chloride + hydrogen gas 
d)
Magnesium chloride + water + carbon dioxide 

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