Form 4 Chemistry Year-end paper

FINAL YEAR EXAM 2021

CHEMISTRY FORM 4

DURATION: 2 HOURS

NAME: ______________________________. School No: _________. CLASS: _____.

This test paper consists of paper 1 (30 multiple choice questions) and paper 1 (5 essay
questions). In paper 1, each question is followed by four alternative answers, choose one
answer only. Answer all questions.

Paper 1 (MCQ)

1 The following statement is found in a report written by a student.
The increase in temperature of the water will increase the solubility of salt in water.
Which of the following is described in the statement?
A Aim
B Observation
C Hypothesis
D Problem statement

2 Diagram 1 shows the structure of an atom.

nucleus
electron

Diagram 1
What are the subatomic particles in the nucleus?
A Neutron only
B Proton and neutron
C Electron and proton
D Electron and neutron

3 Which of the following statements is true for one mole of a substance?
A. 1 mol of magnesium contains 6.02 × 1023 molecules
B 1 mol of nitrogen gas contains 6.02 × 1023 atoms
C 1 mol of water contains the same number of atoms as in 12 g of carbon-12
D 1 mol of carbon dioxide contains the same number of molecules as the number of
atoms in 12 g of carbon-12

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4 Which of the following Group 1 elements has the smallest atomic size?
A Lithium
B Natrium
C Potassium
D Rubidium

5 Which of the following is the property of ionic compounds?
A Does not dissolve in water
B Dissolve in organic solvent
C High melting and boiling points
D Conducts electricity in solid state

6 Which of the following is the method to test the alkalinity of ammonia gas?
A Using filter paper
B Using moist blue litmus paper
C Using moist red litmus paper
D Using anhydrous cobalt chloride paper

7 Which of the following is true about ethanoic acid?
A The pH value is 2
B Ionise completely in water
C Has 100% degree of dissociation in water
D Produce low concentration of hydrogen ions when ionises in water

8 Marble chips react with hydrochloric acid to produce carbon dioxide.
The reaction’s equation is as follows:
CaCO3 + 2HCl → CaCl2 + H2O + CO2
Which of the following will increase the rate of the reaction?
A Use more dilute hydrochloric acid
B Use smaller sized marble chips
C Use a larger volume of hydrochloric acid
D Use marble chips that have a larger surface area

9 When glass X is heated to high temperature and quickly plunged into cold water, X
does not crack. What is the possible glass that represents X?
A Soda lime glass

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B Fused silica glass
C Lead crystal glass
D Borosilicate glass

10 Table 1 shows the melting point and boiling point of substances W, X, Y and Z.

Which substance is a solid at 0oC?
A W and X
B X and Y
C X and Z
D Y and Z

11 The melting point and boiling point of substance A are –20°C and 18°C respectively.
Which of the following statements is true about A at room temperature?
A It has fixed volume.
B The particles are vibrating and rotating about in their fixed positions.
C The energy content of the particles is low.
D The forces of attraction between the particles are very weak.

12 In the excess hydrochloric acid, Carmen added 10 g of calcium carbonate powder.
Calcium chloride, water, and a colourless gas are produced in the reaction, which
turns limewater chalky. Determine the volume of gas generated at room temperature.
A. 1.2 dm3
B. 2.4 dm3
C. 12 dm3
D. 24 dm3

13 Tetraethyllead, (C2H5)4Pb, is found in leaded gasoline. It is transformed to lead (II)
oxide, carbon dioxide gas, and water after complete combustion in abundant oxygen.
Calculate the amount of oxygen gas required to thoroughly react 16.15 g of
tetraethyllead at STP.
A. 1.512 dm3
B. 15.12 dm3
C. 151.2 cm3

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D. 1512 cm3

14 The following information is about atom X and atom Y.
 Atom X is located in Period 2 of the Periodic Table
 Proton number of atom Y is 11
 Element X is located above element Y in the same group of the Periodic Table

Which of the following shows the electron arrangement of atom X?
A 2.1
B 2.2
C 2.8.1
D 2.8.2

15 Element G is placed in Group 14 and Period 2.
What is the proton number for atom G?
A2
B6
C 14
D 18

16 Which of the following are the products in the reaction between iodine, I2 and sodium

hydroxide, NaOH?

I H2 II NaI III H2O IV Na2O

A I and III

B I and IV

C II and III

D II and IV

17 Diagram 2 shows the standard representation of atom X and Y.

Diagram 2

What is the relative molecular mass of the compound formed from atom X and Y?
A 19
B 30
C 39
D 62

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18 Diagram 3 shows part of the Periodic Table of Elements. U, V, W, X, Y and Z are not
the actual symbol of the elements.

Diagram 3
Which of the following pair of elements can form a compound which has high melting
and boiling points and a ratio of elements 1:2?
A U, V
B W, Z
C X, Z
D Y, V

19 Which of the following solvent can Haikal use to erase the writing on a whiteboard?
A Chloroform
B Propanone
C Ethanol
D Water

20 X is gas at room temperature, where Y is solid at room temperature. The similarities
between X and Y are both unable to conduct electricity, does not dissolve in water
and dissolve in the organic solvent. Suggest X and Y.

XY

A Ammonia Sodium chloride

B Silicon dioxide Naphthalene

C Oxygen Graphite

D Carbon dioxide Magnesium oxide

    

21 What is the number of moles of hydrogen ions in 250 cm3 of 2.0 mol dm-3 of sulphuric

acid?

A 0.05 mol

B 0.01 mol

C 0.50 mol
D 1.00 mol
22 X g of sodium chloride is dissolved in 300 cm3 of distilled water and produce 0.005
mol dm-3 of sodium chloride solution. What is X?
A 0.026 g

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B 0.088 g
C 1.026 g
D 1.500 g

23 The following chemical equation represents the reaction between zinc oxide and nitric
acid. ZnO + 2HNO3→ Zn(NO3)2+ H2O
Excess zinc oxide is reacted with 50 cm3 of 2.0 mol dm-3 nitric acid. What is the
maximum mass of zinc nitrate formed?
A 1.89 g
B 4.73 g
C 6.35 g
D 9.45 g

24 The following equation shows the reaction between 30.0 cm3 of 0.5 mol dm-3 nitric
acid and 2.0 g of calcium carbonate.
2HNO3 + CaCO3 → Ca(NO3)2 + CO2 + H2O
What is the mass of calcium carbonate left at the end of the reaction?
A 1.00 g
B 1.25 g
C 1.50 g
D 1.75 g

25 When powder P is put in hydrochloric acid, colourless gas is liberated. The gas is able
to extinguish the flame and sound a pop when tested with a lighted wooden splinter.
What is P?
A Zinc metal
B Zinc oxide
C Zinc chloride
D Zinc carbonate

26 Elsa has tested salt Y by heating it. Elsa finds that the residue, J is black when hot
and cold. Elsa also found that there were two gases released, namely K gas which
ignited the glowing wooden stick and L gas which was brown. Which of the following
is true about the above test?
A Y salt is copper (II) sulphate
B J is copper

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C Gas K is hydrogen gas
D Gas L is nitrogen dioxide gas

27 50 cm3 of 0.25 mol dm-3 hydrochloric acid reacts with 2 g of calcium carbonate at room
temperature and produce carbon dioxide gas.
What is the volume of carbon dioxide gas released?
A 0.15 dm3
B 0.30 dm3
C 0.48 dm3
D 0.52 dm3

28 Table 2 shows the volume of gas collected when calcium carbonate reacts with
hydrochloric acid.

Table 2
Calculate the average rate of reaction.
A 70 cm3 s-1
B 84 cm3 s-1
C 100 cm3 s-1
D 150 cm3 s-1

29 Decomposition of hydrogen peroxide produces oxygen gas to hydrogen peroxide.
What is the effect on the decomposition of hydrogen peroxide if it is heated to a higher
temperature?
A Total volume of oxygen decreases.
B More heat is released.
C Initial rate of decomposition of hydrogen peroxide increases.
D Concentration of hydrogen peroxide increases.

30 What are the advantages of badminton rackets made of composite materials as

compared to made of wood?

I Cheaper II Heavier III Stronger IV Durable

A I and II

B I and III

C II and IV

D III and IV

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Paper 2 (Essay)

1. Describe an experiment that can be carried out to obtain the result below.

Temperature of water (oC) Mass of table salt dissolved in 200cm water (g)
35.0 13.0
55.0 14.5
75.0 20.0

In your answer, include

• the suitable materials and apparatus

• the procedure for this experiment

• two safety precautions that should be adhered to [14 marks]

2. Diagram shows the apparatus set-up of an experiment to study the reactivity of elements in
Group 1 towards oxygen.

(a) Based on the diagram, arrange the reactivity of elements W, X and Y towards oxygen in

ascending order. Describe the differences in the observations and why these occur. Write the

chemical equation for the reaction that occurs in element W. [6 marks]

(b) When Group 1 elements react with water, alkaline hydroxide solution is formed. Describe
an experiment that can be carried out in the school laboratory to study the reaction of a Group
1 element with water by picking one of the elements listed above. In your answer include:

• Procedure

• Observation

• Test to verify the product formed

•Chemical equation [10 marks]

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3. (a) Compare and contrast between simple molecule and giant molecule in terms of physical

state, chemical bond, melting and boiling points and electrical conductivity with a suitable

example. [5 marks]

(b) Describe an experiment to compare the solubility of sodium chloride in two different types

of solvents. In your description, include the names of the solvents. [7 marks]

4. (a) By using the chemicals ammonia solution and sulphuric acid, explain how you prepare
ammonium sulphate salt in laboratory. Include the chemical equation in your answer.[12 marks]

(b) A factory in Town A was claimed because it emits acidic effluent to the surrounding. By
using your chemistry knowledge, state the cause and method to overcome the problem.

[2 marks]

5. (a) Write the chemical equation and calculate the maximum volume of gas released at room

conditions, for 5.0 g marble chips, CaCO3 react with 50 cm3 of 0.5 mol dm-3 hydrochloric acid.

Determine the limiting reagent in your calculation. [7 marks]

(b) Give one use of bronze and brass. By using either brass or bronze, explain in terms of

hardness of the alloy compared to its pure metal. [7 marks]

End of the questions
Prepared by: CHIN YUE JUIN
Reviewed by: Dr Tasneem, Madam Siti

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