Form 3 Science Test Test 4: Acids and basis Total: 50 ... - Pearson

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Form 3 Science Test Test 4: Acids and basis Total: 50 ... - Pearson

Form 3 Science Test

Test 4: Acids and basis

Total: 50 marks

Name: ______________________________________ Date: ______________

Section A

Write down the correct letter for each of the following questions. You must choose one

answer only.

1. Which of the following statements is true

A

B

C

D

We use the pH scale to indicate how strong an acid or alkali is.

Substances with a pH from 1 to 7 are acids.

Substances with a pH from 7 to 14 are alkalis.

All of the above.

2. What do we call a substance that forms an alkaline solution when dissolved

in water

A

B

C

D

An acid

An alkaline

An atom

A base

3. What is used to tell the difference between an acid and a base

A

B

C

D

An indicator

An abductor

An incident

An adjudicator

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Science Test 4

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4. What do we call the reaction that takes place when an acid reacts with

an alkali

A

B

C

D

Neutralisation

Naturalisation

Alkalination

Acidity

5. Which equation shows the reaction between zinc and hydrochloric acid

A

B

C

D

hydrochloric acid + zinc ➝ zinc chloride +hydrogen

hydrochloric acid – zinc ➝ zinc chloride + hydrogen

hydrochloric acid + zinc ➝ zinc chloride + oxygen

None of the above

6. Which of the following statements is true of chemical reactions

A

B

C

D

The more concentrated the acid, the faster the chemical reaction

The less concentrated the acid, the faster the chemical reaction

The more concentrated the acid, the slower the chemical reaction

None of the above

7. The chemical reaction that happens when we make soap is:

A

B

C

D

fat + alkali ➝ soap + glycerol

fat + alkali ➝ soap – glycerol

fat + alkali ➝ soap + glycerine

fat + acid ➝ soap + glycerol

2/6

Science Test 4

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8. Which of the following statements is true

A

B

C

D

Water that contains dissolved calcium or magnesium salts is hard.

Hard water is water that forms a scum when we try to make soap lather.

The scum is formed by a chemical reaction between the calcium salt in

the water and the soap.

All of the above.

9. Which metal is contained in a torch battery

A

B

C

D

Copper

Carbon

Zinc

Silver

10. Calcium chloride is a:

A

B

C

D

Salt

Metal

Solute

Substrate

[10]

3/6

Science Test 4

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Section B

11. Name three examples of substances that are acids. (3)

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

12. Name three examples of substances that are alkalines. (3)

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

13. What do we call a solution with a pH of 7 on the pH scale (1)

_________________________________________________________________

14. Complete the following:

a) A solution that turns blue litmus paper red is a _____________________. (1)

b) A solution that turns red litmus paper blue is a _____________________. (1)

15. Explain the difference between the following in respect of acids:

a) Strong (2)

____________________________________________________________

____________________________________________________________

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Science Test 4

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) Weak (2)

____________________________________________________________

____________________________________________________________

c) Concentrated (2)

____________________________________________________________

____________________________________________________________

d) Dilute (2)

____________________________________________________________

____________________________________________________________

16. Write down the formulae for the following:

a) Sulphuric acid (1)

____________________________________________________________

b) Nitric acid (1)

____________________________________________________________

c) Calcium hydroxide (1)

____________________________________________________________

[20]

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Science Test 4

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Section C

17. Using your knowledge of Science, explain what happens when a person suffers

from heartburn. (10)

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

18. Explain the science experiment you would conduct to show what happens when

an alkali is added to an acid. (10)

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

6/6

Science Test 4

[20]

[Total: 50]

© Pearson Botswana. Permission is given to photocopy these pages for school use.

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