Name ………………………..
Year 8 Science Chemical Reactions Test
Total 25 Marks
1 (1)
The substances at the beginning of a chemical reaction are most accurately called:
A products.
B chemicals.
C reactants.
D enzymes.
2 (1)
Steel objects show very little rusting in desert environments. This is due to the:
A. heat of the desert.
B. higher altitude of most deserts.
C. dryness of the air.
D. dust that constantly covers these objects.
3 (1)
A chemical that can speed up a reaction is known as:
A an inhibitor.
B a catalyst.
C a precipitate.
D a reactant.
4 (1)
Wood burns faster if the flames are fanned. The increase in rate is caused by:
A. more oxygen reaching the combustion site.
B. more carbon dioxide evolved.
C. more nitrogen reacting with the wood.
D. a greater surface area available.
5 (1)
Which of the following is a chemical change?
A An ice-cream melting
B Making a cup of tea
C Hard boiling an egg
D Boiling water to make steam
6 (2)
Describe an example of a:
(a) chemical change
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(b) physical change.
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7 (2)
Zinc chloride and hydrogen gas are produced when zinc reacts with hydrochloric acid.
Write a word equation for this reaction.
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1
Name ……………………….. Year 8 Science Chemical Reactions Test
8 (4)
State all the:
(a) products
(b) reactants
for the following reaction.
potassium lead lead potassium
iodide
+ nitrate iodide + nitrate
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9 (2)
Complete the reaction equation below.
copper
carbonate
oxide + dioxide
10 (3)
List three ways of speeding up a chemical reaction.
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11 (5)
List five observations that provide evidence of a chemical change.
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12 (2)
Explain the difference between a chemical and a physical change.
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