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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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
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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]
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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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) 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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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)
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
_________________________________________________________________
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Science Test 4
[20]
[Total: 50]
© Pearson Botswana. Permission is given to photocopy these pages for school use.