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Worksheets

Acids and alkalis

Total questions: 85

Worksheet time: 1hrs 21mins

Name
Class
Date
1.

What is the pH of distilled water?

a)

pH 12

b)

pH 3

c)

pH 8

d)

pH 7

2.

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

a)

Blue

b)

Red

c)

Green

d)

Colourless

3.

A wasp sting is alkali. Which substance would neutralise the sting?

a)

Vinegar

b)

Bleach

c)

Baking soda

d)

Distilled water

4.

If you wanted to test a colourless and odourless substance at home, what household item could you use?

a)

Red cabbage water

b)

Bleach

c)

Water

d)

Vinegar

5.

Which substance is an acid?

a)

Water

b)

Bleach

c)

Orange juice

d)

Washing powder

6.

Which pH levels indicated a strong acid?

a)

1-3

b)

4-6

c)

8-11

d)

12-14

7.

Which pH level indicates a strong alkali?

a)

1-3

b)

4-6

c)

8-11

d)

12-14

8.

Strong acids and alkalis are...

a)

Sour

b)

Sweet

c)

Corrosive/Caustic

d)

Burn litmus paper

9.

What does this hazard symbol mean?

a)

toxic

b)

flammable

c)

corrosive

d)

explosive

10.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
11.
A solution with a pH of 3.6 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.

What colour is pH neutral?

a)

Yellow

b)

Orange

c)

Red

d)

Green

14.

Acid in our stomach:

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Acetic acid

d)

Carbonic acid

15.

Acid in car battery:

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Acetic acid

d)

Carbonic acid

16.

The color of litmus in neutral solution:

a)

Red

b)

Blue

c)

Purple

d)

Green

17.

Reaction between acid and alkali producing salt and water:

a)

Combustion

b)

Neutralization

c)

Precipitation

d)

Decomposition

18.

Which of the following substances are alkalis?

a)

Calcium hydroxide

b)

Soap

c)

Orange juice

d)

Apple cider

19.

(a)   are used to neutralise acid in the stomach.

20.

What colour does litmus paper change to in an acid?

(a)  

21.

What does this warning symbol mean?

a)

Toxic

b)

Corrosive

c)

Flammable

d)

Irritant

22.

What does this warning symbol mean?

a)

Toxic

b)

Corrosive

c)

Flammable

d)

Irritant

23.

What does this warning symbol mean?

a)

Toxic

b)

Corrosive

c)

Flammable

d)

Irritant

24.

What does this warning symbol mean?

a)

Toxic

b)

Corrosive

c)

Flammable

d)

Irritant

25.
What colour is universal indicator in a strong alkali?
a)
Green
b)
Orange
c)
Purple
d)
Red
26.
What colour is universal indicator in a neutral solution?
a)
Green
b)
Orange
c)
Purple
d)
Red
27.
What colour is universal indicator in strong acid?
a)
Green
b)
Orange
c)
Purple
d)
Red
28.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
29.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
30.

What can turmeric and red cabbage be used for?

a)

To look pretty

b)

As an indicator

c)

As a test for an acid

d)

As a test for acid rain

31.

Acid rain has the same pH value as vinegar

a)

True

b)

False

32.

An alkali can neutralize an acid

a)

False

b)

True

33.

The pH of pure water

a)

5.6

b)

7.0

c)

8.1

d)

0.0

34.

Acid in soft drink:

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Acetic acid

d)

Carbonic acid

35.

Acid in vinegar:

a)

Hydrochloric acid

b)

Sulfuric acid

c)

Acetic acid

d)

Carbonic acid

36.

Which substance is alkali?

a)

Toothpaste

b)

Vinegar

c)

Lemon juice

d)

Soft drink

37.

Which substance is avid?

a)

Toothpaste

b)

Vinegar

c)

Soap

d)

Ammonia

38.

Acids taste .....

a)

sour

b)

bitter

c)

sweet

d)

umami

39.

Rain water is slightly acidic. What is its pH?

a)

1.0

b)

5.6

c)

7.0

d)

8.2

40.

Reaction between acid and alkali producing salt and water:

a)

Combustion

b)

Neutralization

c)

Precipitation

d)

Decomposition

41.

Something that can be used to identify acid/alkali:

a)

Indicator

b)

Oxidator

c)

Reductor

d)

Terminator

42.

The color of universal indicator in hydrochloric acid:

a)

Red

b)

Blue

c)

Purple

d)

Green

43.

The color of universal indicator in sodium hydroxide:

a)

Red

b)

Yellow

c)

Purple

d)

Green

44.

pH of alkali:

a)

0

b)

7

c)

below 7

d)

above 7

45.
A neutralization reaction will always produce...
a)
water & salt
b)
water
c)
salt
d)
water & carbon
46.

Acids are source of

a)

hydrogen ions

b)

hydroxide ions

47.

Alkalis are source of

a)

hydrogen ions

b)

hydroxide ions

48.
Which of the following is NOT a property of an alkali?
a)
Tastes bitter
b)
Corrosive
c)
Changes the colour of blue litmus paper to red
d)
Has a pH value higher than 7
49.
Which of the following is a strong alkali?
a)
Sodium hydroxide
b)
Potassium nitrate
c)
Sodium nitrate
d)
Potassium sulphate
50.
Which of the following is NOT a strong acid?
a)
Ethanoic acid
b)
Nitric acid
c)
Hydrochloric acid
d)
Sulphuric acid
51.
What is the pH value of vinegar?
a)
1
b)
7
c)
4
d)
11
52.
What is the pH value of toothpaste?
a)
1
b)
7
c)
14
d)
8
53.
What is the pH value of pure water?
a)
7
b)
14
c)
4
d)
8
54.
What is the product of a neutralisation reaction?
a)
Acid and alkali
b)
Salt and water
c)
Hydrogen and oxygen
d)
Bromine and chlorine
55.

Which salt is produced during a neutralisation reaction using hydrochloric acid?

a)

chloride

b)

sulphate

c)

nitrate

d)

phosphate

56.

Which salt is produced during a neutralisation reaction using sulfuric acid?

a)

chloride

b)

sulphate

c)

nitrate

d)

phosphate

57.

the higher the pH the more _________ the solution

a)

neutral

b)

acidic

c)

alkaline

58.

the lower the pH the more _________ the solution

a)

neutral

b)

acidic

c)

alkaline

59.

Oranges, Lemons, and limes taste sharp or sour because they contain a solution called

a)

Alkali

b)

Acid

c)

Nitric acid

d)

Hydrochloric acid

e)

Sulphuric acid

60.

Where Hydrochloric Acid found

a)

In the Lemon

b)

In the Tea

c)

In the Milk

d)

In the Stomach

61.

Alkali are ------- to touch

a)

Sticky

b)

Soapy

c)

Soft

62.

Acids and Alkalis are Corrosive

a)

True

b)

False

63.

The strength of an acid measured by its pH

a)

True

b)

False

64.

When an acid is mixed with small quantity of water it is

a)

Dilute Acid

b)

Concentrated Acid

65.

HCI + NaOH ------> NaCl + H2O is a ------ reaction

a)

Neutralization

b)

Combustion

c)

Displacement

d)

Decomposition

66.

Feels slippery

a)

acids

b)

bases

c)

all

67.

Which substance is an acid?

a)

water

b)

orange juice

c)

bleach

d)

washing powder

68.

BASE + ACID ----> SALT +?

a)

water

b)

hydrogen ion

c)

oxygen

d)

hydroxide ion

69.

Which of the below is the formula for an acid?

a)

NaOH

b)

NaCl

c)

H2O

d)

HCl

70.

What is produced when sodium hydroxide reacts with sulfuric acid?

a)

sodium sulfate and water

b)

sodium sulfate and hydrogen

c)

sodium sulfide and water

d)

sodium sulfate and carbon dioxide

71.

what are some weak acids?

a)

lemon juice

b)

oven cleaner

c)

paper

72.

Salts

a)

are formed from joining positive and negative ions.

b)

increase OH- ions.

c)

forms a salt and water.

d)

increases H2O ions.

73.

A salt is formed when nitric acid combines with sodium hydroxide. What are present in the salt that forms?

a)

Sodium chloride

b)

sodium ions and nitrate ions

c)

only sodium ions

d)

only nitrate ions

74.

Which of the following statements best define the term ‘salt’?

a)

Salt is formed when metal reacts with an alkali.

b)

Salt contains sodium ions and chloride ions.

c)

Salt is formed from a weak Van der Waals’ forces of attraction.

d)

Salt is formed when the hydrogen ions in an acid is replaced by metal or ammonium ions.

75.

What are the products if magnesium reacts with hydrochloric acid?

a)

Magnesium chloride + Hydrogen

b)

Magnesium sulfate + Hydrogen

c)

Magnesium oxide + Hydrogen

d)

Magnesium sulfide + Hydrogen

76.

Which of the following reaction can produce sodium nitrate and water?

a)

Sodium chloride solution and nitric acid.

b)

Sodium sulphate solution and nitric acid.

c)

Sodium hydroxide solution and nitric acid.

d)

Sodium and dilute nitric acid.

77.

How do you remove the water to leave solid copper sulfate crystals?

a)

Filter

b)

Evaporate

c)

Distill

78.

What colour does the solution turn when sulfuric acid is added to copper carbonate?

a)

Blue

b)

Green

c)

Clear

d)

Purple

79.
Salts that are made with nitric acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
80.

How do you separate an excess insoluble reactant from a solution?

a)

Filtration

b)

Precipitation

c)

Crystalisation

d)

Evaporation

81.

Which two chemicals could you react to make only potassium chloride and water?

a)

Potassium and hydrochloric acid

b)

Potassium hydroxide and hydrochloric acid

c)

Potassium oxide and sulfuric acid

d)

Potassium and sulfuric acid

82.

_________________ + nitric acid --> calcium nitrate + water

a)

calcium sulfate

b)

calcium oxide

c)

calcium carbonate

d)

calcium

83.
The products of a neutralisation reaction are lithium sulfate and water. What is the name of the acid used to neutralise the alkali lithium hydroxide?
a)
hydrochloric acid
b)
sulfuric acid
c)
nitric acid
d)
phosphoric acid
84.

State a reason why filtration is carried out during the preparation of Copper (II) sulphate when copper (II) oxide is added to dilute Sulphuric (VI)?

a)

To dry Copper (II) Sulphate

b)

To remove water

c)

To remove unreacted Copper (II) oxide

d)

To speed up the rate of reaction

85.
Identify the 'evaporating basin' from the diagrams.
a)
A
b)
B
c)
C
d)
D

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