CHEMISTRY

1.
Which of the following
always
occurs when a chemical reaction takes place?
A
A gas is produced.
B
A precipitate is formed.
C
A colour change takes place.
D
A new substance is formed.
2.
Which line in the table correctly describes what happens if 1 gram of a catalyst is
involved in a chemical reaction?
Speed of reaction
Mass of catalyst left at end in grams
A
faster
1
B
unchanged
1
C
faster
0
D
unchanged
0
3.

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The diagram below shows a water molecule.
Which of the following statements correctly describes this molecule?
A
Atoms held together by weak bonds
B
Atoms held together by strong bonds
C
Ions held together by weak bonds
D
Ions held together by strong bonds
O
H

H

4.
The table shows information about four compounds.
Compound
Solubility in water
Conductivity when
molten
1
soluble
conducts
2
soluble
does not conduct
3
insoluble
conducts
4
insoluble
does not conduct
Which of the following statements is correct?
A
Compounds
1
and
2
are ionic.
B
Compounds
3
and
4
are ionic.
C
Compounds
1
and
3
are ionic.
D
Compounds
2
and
4
are ionic.
5.
The formula for dinitrogen tetroxide is
A
N
2
O
3
B
N
2
O
C
NO
2
D
N
2
O
4
.
6.
The pH of a solution can be measured using
A
Benedict’s solution
B
Universal indicator
C
iodine solution
D
limewater.

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