1. SULIT 4541/2
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Section A
[60 marks]
Answer all questions.
1. Table shows the numbers of protons and neutrons for atoms W, X, Y and Z.
Atom Number of protons Number of neutrons
W 8 9
X 8 10
Y 12 12
Z 11 12
(a) (i) What is meant by nucleon number?
________________________________________________________________________
[1 mark]
(ii) What is the nucleon number of atom W?
________________________________________________________________________
[1 mark]
(b) Write the symbol of atom Y in the form of z Y.
___________________________________________________________________________
[1 mark]
(c) (i) Write the electron arrangement of atom Z.
________________________________________________________________________
[1 mark]
(ii)What is the number of valence electrons in atom Z?
________________________________________________________________________
[1 mark]
(d) Which atoms are isotopes? Explain why.
__________________________________________________________________________
___________________________________________________________________________
[2 marks]
A

2. SULIT 4541/2
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(e) Solid Q is a compound of element W. Solid Q has melting point of 85C and boiling point of
150C. A boiling tube containing solid Q is heated at room temperature until 180C.
(i) Sketch a graph of temperature against time during heating.
[2 marks]
(ii) Draw the arrangement of particles of substance Q at 50C.
[1 mark]
2. Diagram shows the set-up of apparatus to investigate the electrolysis of silver nitrate solution
with carbon electrodes and copper(II) sulphate solution with copper electrodes.
(a) What is the energy change in electrolysis?
__________________________________________________________________________
[1 mark]

3. SULIT 4541/2
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(b) Write the formulae of all the ions present in silver nitrate solution.
__________________________________________________________________________
[1 mark]
(c) In the electrolysis of Cell 1
(i) What is the observation at electrode B?
_________________________________________________________________
[1 mark]
(ii) Write the half equation for the reaction at electrode B.
_________________________________________________________________
[1 mark]
(d) In the electrolysis of Cell 2
(i) What is the observation at electrode C?
_________________________________________________________________
[1 mark]
(ii) Write the half equation for the reaction at electrode C.
_________________________________________________________________
[1 mark]
(e) What are the processes that occur at electrodes A and D?
Electrode A: __________________________________________________________
Electrode B: __________________________________________________________
[2 marks]
(f) State which cell the concentration of electrolyte remains unchanged.
___________________________________________________________________________
[1 mark]
(g) State one application of electrolysis in industrial.
___________________________________________________________________________
[1 mark]

4. SULIT 4541/2
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3. Diagram shows a series of reactions of lead(II) carbonate.
(a) (i) Name the solid P.
________________________________________________________________________
[1 mark]
(ii) Draw a labeled diagram of the set-up of apparatus can be used to produce solid P and to
identify gas Q in step I.
[2 marks]
(iii) Write the chemical equation for the decomposition of lead(II) carbonate when
heated.
_________________________________________________________________
[1 mark]

5. SULIT 4541/2
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(iv) 13.35 g of lead(II) carbonate is heated to decompose completely, calculate the
volume of gas Q produced at room conditions.
[Relative atomic mass: Pb = 207, C = 12, O = 16, and 1 mol of gas occupies 24
dm3
at room conditions]
[2 marks]
(b) (i) Name the precipitate X.
________________________________________________________________________
[1 mark]
(ii) State the colour of precipitate X.
_______________________________________________________________________
[1 mark]
(iii)Write the ionic equation for the formation of precipitate X.
_______________________________________________________________________
[1 mark]
(iv) How to obtain precipitate X from the mixture?
_______________________________________________________________________
[1 mark]

6. SULIT 4541/2
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4. Two experiments were carried out to investigate factors that affect the rate of reaction. Table
shows the description of each experiment.
Experiment Reactants Temperature/C
Total volume of gas
collected at 2
minutes/cm3
I
Excess zinc powder + 20 cm3
of 0.1 mol dm-3
sulphuric acid
30 20.0
II
Excess zinc powder + 20 cm3
of 0.1 mol dm-3
sulphuric acid
+ copper(II) sulphate solution
30 32.0
(a) Draw a diagram of the set-up of apparatus to carry out this experiment.
[2 marks]
(b) Write the chemical equation for the reaction between zinc and sulphuric acid.
__________________________________________________________________________
[1 mark]
(c) Calculate the average rate of the reaction for the first two minutes of experiment I and
experiment II in cm3
s-1
.
Experiment I:
Experiment II:
[2 marks]

7. SULIT 4541/2
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(d) Calculate the maximum volume of gas produced in experiment II.
[1 mol of gas occupies 24 dm3
at room conditions]
[2 marks]
(e) Compare the rate of reaction between experiment I and II, explain why there is a difference in
the rate of reaction based on the collision theory.
___________________________________________________________________________
___________________________________________________________________________
___________________________________________________________________________
[3 marks]
5. Table shows molecular formulae of 4 carbon compounds.
Compound Molecular formula
A C4H8
B C4H10
C C4H9OH
D C2H5COOH
(a) Write the general formula of the homologous series of compound B.
___________________________________________________________________________
[1 mark]
(b) State the functional group of compound A and compound D.
Compound A: __________________________________________________________
Compound D: __________________________________________________________
[2 marks]

8. SULIT 4541/2
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(c) Compound B shows isomerism. Draw the structural formula of all isomers of compound B.
[2 marks]
(d) Compound D and compound C are reacted with the presence of the concentrated sulphuric
acid.
(i) Name the product formed from the reaction.
________________________________________________________________________
[1 mark]
(ii) State one special characteristic of the product formed.
________________________________________________________________________
[1mark]
(e) Compound A burns in excess oxygen to produce carbon dioxide and water.
(i) Write a balanced chemical equation for the reaction.
________________________________________________________________________
[1 mark]
(ii) 11.2 g of compound A burns in excess oxygen, calculate the number of carbon dioxide
molecules formed.
[Relative atomic mass C = 12, O = 16 and Avogadro number = 6.02 x 1023
]
[2 marks]

9. SULIT 4541/2
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6. Diagram shows the apparatus set-up to determine the empirical formula of oxide metal M.
(a) (i) State the name of two reactants to prepare hydrogen gas in the laboratory.
________________________________________________________________________
[1 mark]
(ii) Write the chemical equation for the reaction in (a)(i).
________________________________________________________________________
[1 mark]
(b) State one precaution that must be taken when carrying out the experiment.
___________________________________________________________________________
[1 mark]
(c) Table shows the results of the experiment.
Mass of combustion tube + asbestos paper 36.50 g
Mass of combustion tube + asbestos paper + M oxide 37.30 g
Mass of combustion tube + asbestos paper + M 37.14 g
(i) Based on the results, determine the empirical formula of M oxide.
[Relative atomic mass: O = 16, M = 64]
[3 marks]

10. SULIT 4541/2
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(ii) Write the chemical equation for the reaction between M oxide and hydrogen gas.
________________________________________________________________________
[1 mark]
(d) (i) The empirical formula of magnesium oxide cannot be determined by the above method.
Explain why.
________________________________________________________________________
[1 mark]
(ii) Draw a suitable set-up of apparatus for the experiment to determine the empirical formula
of magnesium oxide.
[2 marks]

11. SULIT 4541/2
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Section B
[20 marks]
Answer any one question from this section
7. (a) Element X reacts with element Y to form a compound. Diagram shows the electron
arrangement of the compound.
(i) Write the electron arrangement of atom of element X. State the position of
element X in the Periodic Table of Elements.
[3 marks]
(iii) Write the chemical equation for the reaction between element X and element Y.
Explain how the bond in the compound formed.
[7 marks]
(b) Diagram shows the set-up of apparatus to investigate the electrical conductivity of
lead(II) bromide and naphthalene.
Table shows the result obtained.
Substance State of substance Observation
Lead(II) bromide
Solid The bulb does not glow
Molten The bulb glows brightly
Naphthalene
Solid The bulb does not glow
Molten The bulb does not glow
Explain the observation in the table above.
Write the chemical equation for the reaction at cathode and anode.
[10 marks]

12. SULIT 4541/2
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8. Diagram shows the flow chart for the reactions of propan-1-ol.
(a) Draw the structural formula and state the name of compounds X, Y and Z.
[6 marks]
(b) State the type of Reaction I and explain a chemical test to identify compound X.
[3 marks]
(c) Compound X can be converted into propan-1-ol. Write the chemical equation and state the
conditions needed for the reaction.
[3 marks]
(d) In Reaction III, describe the method of preparing compound Z in laboratory.
[4 marks]
(e) When calcium carbonate is added to compound Y, carbon dioxide gas is liberated.
 State the name of the functional group of compound Y
 Write the general formula of compound Y
 Write the chemical equation of the reaction
[4 marks]

13. SULIT 4541/2
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Section C
[20 marks]
Answer any one question from this section
9. (a) (i) What is a catalyst?
(ii) State two characteristics of a catalyst.
(iii) Name one chemical process and the catalyst used in industry.
[4 marks]
(b) State two factors other than catalyst which can affect the rate of reaction. Based on the
collision theory, explain how the factors that you mentioned can affect the rate of
reaction.
[8 marks]
(c) Knowledge about the factors that affect the rate of reaction is very useful in human life.
State two activities at home and explain how the knowledge about the factors that affect
the rate of reaction is applied in the activities mentioned.
[8 marks]
10. (a) Table shows the potential difference and the negative terminal when different pairs of
metals are used in a simple voltaic cell to construct electrochemical series.
Pair of metals Potential difference/V Negative terminal
Q – R 0.2 Q
R – S 0.8 R
P – S 2.6 P
P – Q x y
(i) By using a simple voltaic cell, describe an experiment to determine the position of
metals P, Q, R and S in electrochemical series.
[10 marks]
(ii) Based on data in the table above, predict the x value of the potential difference of pair of
metals P – Q and the negative terminal, y.
If metal Q is zinc, suggest the identity of metal P. Explain your answer.
[4 marks]

14. SULIT 4541/2
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(b) Table shows the observations at the anode when two different electrolytes are
electrolysed using carbon electrodes.
Electrolyte Observation at anode
1.0 mol dm-3
sodium chloride A yellowish gas is released
0.0001 mol dm-3
sodium chloride A colourless gas is released
Based on the information in the table, explain the observations at the anode for both
electrolytes.
[6 marks]
END OF QUESTION PAPER