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1. The
atomic number of an element is equal to -
(a) The number of protons and neutrons in an atom of
the element.
(b) The number of neutrons in an atom of the element.
(c) The number of protons in an atom of the element.
(d) The number of electrons in an ion of the element.
2. An
element is a substance that consists of-
(a) Atoms of identical mass
(b) Atoms with the same numbers of protons.
(c) Atoms that are identical in every way.
(d) Atoms with the same numbers of neutrons.
3. Element
X has 8 protons, 8 neutrons and 8 electrons. We can conclude that
-
(a) Its mass number is 16.
(b) Its atomic number is 16.
(c) It is very unreactive
(d) Its mass number is 24.
4. The
atomic number of an unreactive stable inert gas could be.
| (a) |
6 |
(b) |
8 |
(c) |
10 |
(d) |
12 |
Table I refers to Questions 5, 6, 7 and 8.
Element
|
Atomic
Number
|
Mass
Number
|
Helium
(He)
|
2
|
4
|
Carbon
(C)
|
6
|
12
|
Sodium
(Na)
|
11
|
23
|
Magnesium
(Mg)
|
12
|
24
|
| (a) |
Carbon |
(b) |
Sodium |
(c) |
Magnesium |
(d) |
Sodium
and Magnesium |
6. An
element with 12 electrons is -
| (a) |
Carbon |
(b) |
Sodium |
(c) |
Magnesium |
(d) |
Sodium
and Magnesium |
7. An
element, which would not form ions, would be -
| (a) |
Helium |
(b) |
Sodium |
(c) |
Magnesium |
(d) |
None
of the above |
8. An
element, which would form an ion with a single positive charge,
would be -
| (a) |
Carbon |
(b) |
Sodium |
(c) |
Magnesium |
(d) |
Helium |
9. Which
of the following statements concerning the atom is false?
(a) The nucleus contains most of the mass of the atom.
(b) Protons and electrons are much heavier than neutrons.
(c) Neutrons have no electric charge.
(d) The atom is mostly empty space.
Consider the following Bohr shell diagrams. These refer
to Questions 10 and 11.
|
I
10p+, 10n
|
II
6p+, 6n
|
III
9p+, 9n
|
IV
11p+, 12n
|
 |
 |
 |
 |
10. The
atom most likely to lose electrons is-
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
11. The
atom most likely to form a negative ion is-
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
12. The
diagram that best represents the ion of sulfur (sulfide ion) is
-
| (A) |
S2+ |
(B) |
S2- |
(C) |
S6+ |
(D) |
S6- |
| |
 |
|
|
|
|
|
|
The diagrams
below represent atoms or ions of four elements. These diagrams
relate to Questions 13 - 17
 .
13. The
ion with charge 2+ is-
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
14. The
ion with a single negative charge is -
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
15. The
diagram that represents a neutral atom is -
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
16. The
heaviest element is -
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
17. The
atomic number of element II is-
| (a) |
12 |
(b) |
10 |
(c) |
24 |
(d) |
2+ |
18. An example
of a polyatomic ion is -
| (a) |
Ag+ |
(b) |
Na |
(c) |
H2O2 |
(d) |
CO32- |
19. An example
of an atom is
| (a) |
Ag+ |
(b) |
Na |
(c) |
H2O2 |
(d) |
CO32- |
20. If the
hydroxide of an imaginary metal X has the formula X (OH)2,
the nitrate of metal X would have
the formula-
| (a) |
XNO3 |
(b) |
X2NO3 |
(c) |
X(NO3)2 |
(d) |
X(NO)2 |
21. If chromium
nitrate is represented by the formula Cr(NO3)3
and sodium selenate by the formula Na2SeO4
the formula of chromium selenate is -
| (a) |
CrSeO4 |
(b) |
Cr2SeO4 |
(c) |
Cr(SeO4)3 |
(d) |
Cr2(SeO4)3 |
22. Zinc
hydroxide is best represented by the formula -
| (a) |
ZnOH2 |
(b) |
Zn(OH)2 |
(c) |
Zn2OH |
(d) |
Zn(OH)3 |
23. Which
of the following represents a compound?
| (a) |
H2 |
(b) |
Ag+ |
(c) |
H3O+ |
(d) |
NH3 |
24. A precipitate
-
(a) Is an insoluble substance, which can be produced
when two solutions react.
(b) Represents a colour change
(c) Can be separated by distillation
(d) Forms a solution when mixed with water.
25. A substance
can be identified by
(a) A flame test
(b) The precipitate it forms (if any) with known
solutions
(c) A combination of reactions with other substances
(d) Its melting point and boiling point
(e) A combination of all of the above.
26. Which
of the following represents a physical change?
| (a) |
Rusting
of Iron |
(b) |
Respiration |
(c) |
Magnetisation |
(d) |
Combustion
(burning in oxygen) |
27. Which
of the following represents a chemical change?
(a) "Dry ice' changing to carbon dioxide gas
(b) The glowing of a light bulb element
(c) Sugar dissolving in water
(d) Starch being converted to glucose during digestion.
28.
Different atoms of the same element may have different mass numbers
because they can have different
-
(a)
Atomic numbers
(b) Numbers of protons
(c)
numbers of neutrons
(d) numbers of electrons.
29.
When 1.6g of a compound burns in air, 4.4g of carbon dioxide and
3.6g of water are produced. How
much oxygen was burnt?
| (a) |
1.6g |
(b) |
3.6g |
(c) |
4.4g |
(d) |
6.4g |
(e) |
impossible
to tell |
30. Which
of the following elements is unlikely to form an ion?
| (a) |
Carbon |
(b) |
Sodium |
(c) |
Fluorine |
(d) |
Oxygen |
Questions
31 and 32 refer to the following electron shell configurations of
the following atoms.
I 2,8,8 II 2,8,7 III
2,8,1 IV 2,4
31. The
element that is most unreactive is -
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
32. The
element that would form an ion with a 1- (negative 1)
charge is -
| (a) |
I |
(b) |
II |
(c) |
III |
(d) |
IV |
33.
When carbon burns in a limited supply of air, carbon monoxide is
formed. The balanced chemical equation
for this reaction is -
(a) C + O –› CO
(b) 2C + O2 –›
2CO
(c) C + O2 –›
CO2
(d) C + 2O –› CO2
34. A catalyst
-
(a) Speeds up the rate of a chemical reaction
(b) Slows down a chemical reaction
(c) Has no effect on a chemical reaction
35. Identify
the reactant or reactants in the following equation -
Zn + 2HCl –› ZnCl2
+ H2
| (a) |
Zn
only |
(b) |
Zn
+ 2HCl |
(c) |
ZnCl2
only |
(d) |
ZnCl2
+ H2 |
36. Which
of the following represents an element?
| (a) |
HCl |
(b) |
CO |
(c) |
HI |
(d) |
Br2 |
Questions
37 and 38 refer to the following statements
I. A new substance is formed
II. No new substance is formed
III. Is usually difficult to reverse
IV is usually easy to reverse
37. The
statements above that refer to a chemical change are -
| (a) |
I
and III |
(b) |
I
and IV |
(c) |
II
and III |
(d) |
II
and IV |
38. The
correct formula for sodium sulfate is -
| (a) |
Na2SO3 |
(b) |
NaSO4 |
(c) |
Na2S |
(d) |
Na2SO4 |
39. Consider
the following chemical equation -
CH4 + O2
–› H2O +
CO2
The coefficients required to correctly balance the above
equation are -
| (a) |
1,
2, 1, 2 |
(b) |
2,
1, 2, 1 |
(c) |
1,
2, 2, 1 |
(d) |
2,
4, 4, 2 |
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