Acids and Bases: Grade 7 Quiz


Acids and Bases: Grade 7 QuizVersión en línea ACID and BASE basics por Abegail Atienza 1 What is a defining feature of an acid in the pH scale? a Acids turn blue litmus paper red b Acids feel soapy to touch c Acids have a pH less than 7 d Acids have a pH greater than 7 2 Which instrument is used to test whether a solution is acidic or basic? a Thermometer b Litmus paper c Barometer d Telescope 3 What is a base commonly found in households? a Hydrochloric acid b Soap c Lemon juice d Vinegar 4 What happens to red litmus paper in a basic solution? a It stays blue or turns blue b It disappears c It turns red d It turns purple 5 Which of the following is an example of an acid? a Citric acid in citrus fruits b Ammonia solution c Baking soda solution d Soapy water 6 Which of the following is an example of a base? a Vinegar b Ammonia solution c Hydrochloric acid d Lemon juice 7 What is neutralization? a A base evaporates b A metal dissolves c A gas is released d An acid reacts with a base to form a salt and water 8 Which statement correctly describes pH 7? a It is acidic b It is basic c It is highly acidic d It is neutral 9 If a solution turns blue litmus paper red, what can you conclude? a The solution is basic b The solution is acidic c The solution is a salt solution d The solution is neutral 10 What safety practice should you follow when handling acids and bases? a Wear goggles and gloves b Mix with bare hands c Taste to check strength d Ignore spills if small Feedback 1 acids have pH < 7 and turn red litmus red. 2 Litmus paper changes color in acidic or basic solutions. 3 Soap acts as a basic substance; vinegar and lemon juice are acids. 4 Bases turn red litmus blue; blue litmus remains blue or turns blue. 5 Citrus fruits contain citric acid, a common acid. 6 Ammonia is a common base; vinegar/lemon juice are acids. 7 Neutralization combines acid and base producing salt and water. 8 pH 7 is neither acidic nor basic. 9 Acids turn blue litmus red; red litmus stays red. 10 Always use proper PPE and handle with care.

1

What is a defining feature of an acid in the pH scale?

a

Acids turn blue litmus paper red

b

Acids feel soapy to touch

c

Acids have a pH less than 7

d

Acids have a pH greater than 7

2

Which instrument is used to test whether a solution is acidic or basic?

a

Thermometer

b

Litmus paper

c

Barometer

d

Telescope

3

What is a base commonly found in households?

a

Hydrochloric acid

b

Soap

c

Lemon juice

d

Vinegar

4

What happens to red litmus paper in a basic solution?

a

It stays blue or turns blue

b

It disappears

c

It turns red

d

It turns purple

5

Which of the following is an example of an acid?

a

Citric acid in citrus fruits

b

Ammonia solution

c

Baking soda solution

d

Soapy water

6

Which of the following is an example of a base?

a

Vinegar

b

Ammonia solution

c

Hydrochloric acid

d

Lemon juice

7

What is neutralization?

a

A base evaporates

b

A metal dissolves

c

A gas is released

d

An acid reacts with a base to form a salt and water

8

Which statement correctly describes pH 7?

a

It is acidic

b

It is basic

c

It is highly acidic

d

It is neutral

9

If a solution turns blue litmus paper red, what can you conclude?

a

The solution is basic

b

The solution is acidic

c

The solution is a salt solution

d

The solution is neutral

10

What safety practice should you follow when handling acids and bases?

a

Wear goggles and gloves

b

Mix with bare hands

c

Taste to check strength

d

Ignore spills if small

Feedback

1

acids have pH < 7 and turn red litmus red.

2

Litmus paper changes color in acidic or basic solutions.

3

Soap acts as a basic substance; vinegar and lemon juice are acids.

4

Bases turn red litmus blue; blue litmus remains blue or turns blue.

5

Citrus fruits contain citric acid, a common acid.

6

Ammonia is a common base; vinegar/lemon juice are acids.

7

Neutralization combines acid and base producing salt and water.

8

pH 7 is neither acidic nor basic.

9

Acids turn blue litmus red; red litmus stays red.

10

Always use proper PPE and handle with care.