Question 1

Various options are provided as possible answers to the following questions. Each
question has only ONE correct answer. Choose the answer and write only the letter
(A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1. 11 D.

1.1 Which ONE of the following substances is NOT a pure substance?

A Iron
B Sugar
C Steel
D Graphite (2)

1.2 The CORRECT chemical formula for potassium nitrate is …

D K2 NO3 (2)

1.3 Different isotopes of the same element have different …

A atomic numbers.
B numbers of neutrons.
C numbers of protons.
D numbers of electrons. (2)

1.4 Which ONE of the following ionisation equations represents the second
ionisation of magnesium

A Mg(g) + energy → Mg++e
B Mg+(s) + energy → Mg2++ 2e
C Mg+(g) + energy → Mg2++ 2e
D Mg(s) + energy → Mg++e (2)

1.5 Which PAIR of elements is most likely to have a similar arrangement of outer
electrons and similar chemical behaviour?

A Boron and aluminium
B Helium and fluorine
C Carbon and nitrogen
D Chlorine and oxygen (2)

1.6 Which ONE of the following statements is INCORRECT about the properties of a physical change?

A When a physical change occurs, the compounds may rearrange
themselves, but the bonds in between the atoms will not break.
B Physical change in matter is reversible.
C Energy is absorbed when matter changes from a solid to a liquid.
D Molecules are not conserved during a physical change. (2)

1.7 In the compound, H2O, the ratio of the MASS of hydrogen to oxygen is
always …

A 1 : 2.
B 2 : 1.
C 1 : 8.
D 1 : 16. (2)

1.8 One mole of H2SO4 contains …

A 7 atoms.
B 1 molecule.
C 6,02×1023 molecules.
D 42,14×1023 molecules. (2)

1.9 Which ONE of the following solutions will NOT form a precipitate if added to a
solution of silver nitrate?

A NaCl(aq)
B MgBr2(aq)
C KI(aq)
D Mg(NO3)2(aq) (2)

1.10 The sphere in which minerals are found is known as …

A atmosphere.
B biosphere.
C lithosphere.
D stratosphere. (2)


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