Test on electrochemistry and manufactured substance in industry

1. Name:……………………………………….. College no:
…………………………….
Class : ………………………………Teacher’s name :
………………………………..
MAKTAB RENDAH SAINS MARA
%
PENGKALAN CHEPA
STANDARDIZED TEST 1 SEM 2, 2011
CHEMISTRY
FORM 4
1 1/2 HOURS
INSTRUCTIONS: Section Question Full Marks
mark
A OBJECTIVE 20
(20)
1. This question paper consists of THREE
sections: B 1 10
Section A ,B AND C 2 10
2. Answer all questions.show your working, it 3 10
may help you to get marks.
3. If you wish to cancel any answer, neatly cross C 1 20
out the answer TOTAL 70
4. The diagrams in the questions provided are
not drawn to scale unless stated. This booklet contains of 13 printed pages
5. You may use a non-programmable scientific including the front page.
calculator.
Section A:Objective Questions
1 The equation shows the reaction of nitrogen, N2 and hydrogen, H2 to form ammonia,
NH3.

2. N2 (g) + 3H2 (g) → 2NH3(g)
Based on the equation, how many moles of ammonia is formed if 2 moles of
nitrogen react with 6 moles of hydrogen?
A 2
B 4
C 5
D 6
2. The diagram shows the arrangement of atoms of a substance.
Which of the following substances has the same arrangement of atoms as in the
diagram?
A Aluminium
B Copper
C Brass
D Iron
3. Which of the following pairs is correct monomer for the polymer?
Monomer Polymer
A Ethene Polythene
B Glucose Protein
C Amino acid Carbohydrate
D Isopropene Nylon
4. Which of the following substances is found in a photochromic glass?
A Plastic and ceramic

3. B Glass and silver chloride
C Plastic and sodium chloride
D Ceramics and silver chloride
5. Which of the following chemical equations represents the formation of oleum
in Contact Process?
A S + O2 → SO2
B 2 SO2 + O2 → 2 SO3
C SO3 + H2SO4 → H2S2O7
D H2S2O7 + H2O → 2 H2SO4
6. An alloy which is used to make surgical forceps has the following composition:
Iron - 74 %
Chromium - 18 %
Carbon - 8%
This alloy is strong and does not corrode easily. What is this alloy?
A Bronze
B Pewter
C Duralumin
D Stainless steel
7. Pure metals are ductile and malleable. This is because
A atoms can move freely
B layers of atoms can slide easily
C bonding between atoms are weak
D atoms are orderly and closely packed
8. Why is ceramic used for the wall of a nuclear reactor
A. ceramic is very hard

4. B. Ceramic is malleable
C. Ceramic is inert towards chemicals
D. Ceramic can with stand high temperature
9 Which of the following pairs is correct?
Industrial process Product Catalyst
A Contact process Sulphuric acid Platinum
B Haber process Ammonia Iron
C Cracking process Hydrocarbon Vanadium(II) oxide
D Ostwald process Hydrochloric acid Copper
10. In order to produce as glass that is more resistant to heat and chemicals,
substance X is added to soda lime glass in the manufacturing process. What is
X?
A. Boron oxide
B. Lead (II) oxide
C. Sodium carbonate
D Calcium carbonate
11. Which of the following substance is electrolyte?
A. Alcohol
B. Copper(II) chloride
C. Glucose solution
D. Mercury
12. Figure 1 shows the set-up of apparatus for the electrolysis of ferum(II) sulphate
solution.

5. Carbon
Carbon
electrode Y
electrode X
Dilute ferum(II)
sulphate solution
Figure 1
What is formed at carbon electrode X ?
A. Ferum
B. Oxygen
C. Sulphur dioxide
D. Hydrogen gas
13. Electrolyte can conducted electricity because an electrolyte
A. is a metal
B. contains mobile ions
C. allows the flow of electrons
D. conducts electricity in the aqueous form
14. Table 1 shows the results of an experiment for three chemical cells.
Chemical cell Metal pairs Negative terminal Cell voltage / V
X P and R R 1.9
Y R and S S 0.8
Z Q and R R 0.3
Table 1
Which of the following can be deduced from table1?
I. The cell voltage is 1.6 V when P and Q are used as electrodes.
II. The cell voltage is 1.1 V when P and S are used as electrodes.
III. Electrons flow from terminal Q to terminal S in the metal pair Q and S.
IV. P functions as a positive terminal when it is paired with Q, R or S in a cell.
A. I and IV only
B. II and III only
C. I, II and III only
D. I, II, III and IV

6. Copper foil Silver foil
Sodium Silver nitrate
sulphate solution
solution
Figure 3
15. Copper is above silver in the Electrochemical Series. An experiment is set up as
shown in figure 3. Which of the following occur?
I The solution around the copper foil turns blue.
II Silver crystals slowly form on the silver foil.
III Electrons flow in the direction shown
IV The bulb glows.
A. I, II and III only
B. I and III only
C. II and IV only
D. I, II, III and IV
Zn + Cu2+  Cu + Zn2+
16. The above equation represents a reaction in a chemical cell. Which of the following
statements is TRUE.
A. zinc electrode is the positive terminal
B. Copper ions receive electrons
C. Electron flows from the copper rod to the zinc rod.
D. The copper rod is more electropositive then the zinc rod.

7. 17. 10 ml of copper(II) sulphate solution was left in an iron cup overnight. Which of the
following statements describes what happened?
A. the solution evaporated completely and some copper(II) sulphate
crystals were left behind.
B. The part of the container in contact with the solution was coated
with copper.
C. Some fine iron particles were formed in the solution.
D. The solution turned colorless.
18. Which of the following ions attracted to cathode during electrolysis of copper(II)
sulphate solution?
A. ion copper(II) only.
B. ion copper(II) and ion sulphate.
C. Ion copper(II) and ion hydrogen.
D. Ion hydrogen and ion hydroxide.
19. Which of the following combination can be used in electroplating iron spoon with
nickel metal?
Cathode Anode Electrolytes
A. Iron spoon nickel nickel(II) sulphate solutions
B. Nickel iron spoon nickel(II) sulphate solutions
C. Iron spoon nickel iron(II) sulphate solutions
D. Nickel iron spoon iron(II) sulphate solutions
20. In the electrolytic manufacture of aluminium, what is the anode (positive electrode)
made of?
A. copper
B. graphite
C. platinum
D. steel

8. SECTION B: SUBJECTIVES
1 Diagram 1 shows the manufacture of sulphuric acid.
Concentrated
sulphuric acid
catalyst
sulphur Waste gas
DD SO2 + O2 SO3
Dry air
Substance Y
water sulphuric acid, H2SO4
(a) (i) What is the name of this process?
…………………………………………………………………………………..
[1 mark]
(ii) State the name of catalyst X.
…………………………………………………………………………………..
[1 mark]
(iii) State the name of substance Y.
…………………………………………………………………………
[1 mark]
(iv) Substance Y is formed when sulphur trioxide reacts with concentrated
sulphuric acid. Write the chemical equation for this reaction.
…………………………………………………………………………
[2 mark]

9. (b) Ammonia is manufactured for industrial purposes through a process
(i) State 3 conditions for the manufacture of ammonia
………………………………………………………………………………………………
………………………………………………………………………………………………
……………………………………………………………………………………………
[3 marks]
(ii) State 2 uses of ammonia in industry
…………………………………………………………………………………………
…………………………………………………………………………………………
[ 2 marks]
2. (A)Figure 1 below shows the apparatus arrangement to study the electrolysis of dilute
copper(II) nitrate.
copper(II)
nitrate
carbon
carbon
electrode X
electrode Y
A
Figure 1
a) Identify the cathode and the anode on the figure above by writing the word
“cathode” and “anode” in the figure.
[1 marks]
b) State the energy changes that occur in the process.
______________________________________________________________
[1 mark]

10. c) Write down all the formulae of ions present in the copper(II) nitrate solution.
__________________________________________________________
__________________________________________________________
[2 marks]
d) What observations can be made at
(i) X?
___________________________________________________________
[1 mark]
(ii) Y?
__________________________________________________________
[1 mark ]
(B) Figure 2 below shows the apparatus arrangement to study the electrolysis of
molten lead (II) bromide.
a) Write the half equation for the reaction occurred
i) At the anode :
____________________________________________________
ii) At the cathode
____________________________________________________
[ 2marks]

11. b) Name the substances formed at each of the electrodes
i) Anode : _________________________________________________
ii) Cathode : _______________________________________________
[ 2marks ]
3)
A) Diagram below shows a Daniel cell
a) Mark the positive and negative electrodes on the diagram [ 1m]
b) What is the function of the porous pot? [ 2m]
________________________________________________________________
________________________________________________________________
c) State an observation at the zinc electrode after 5 minutes [ 1m]

12. ________________________________________________________________
d) Write half equation at the copper electrode [1m]
________________________________________________________________
e) If the copper electrode is replaced with an iron electrode, what will be the change
in voltmeter reading? Explain your answer [2m]
________________________________________________________________
________________________________________________________________
B) A student wish to electroplate an iron key with silver. Draw a labeled diagram to
show how this can be carried out in a laboratory. [ 3m]

13. SECTION C:Essay
a) i) Explain the meaning of alloy [2 marks]

14. ii) Diagrams A and diagram B below shows arrangement of atoms in 2 different
substances.
• Suggest what substance A is and substance B.
• Explain why the arrangement in B gives a better property than the
arrangement in A. [6 marks]
Diagram A Diagram B
iii) Give two advantages of alloy [2 marks]
b) Diagram below is a synthetic polymer.
i) Name the polymer above and also name its monomer [2 marks]
ii) State 2 ways to reduce the pollution caused by synthetic polymer [2 marks]
iii) Which type of glass is used for lab apparatus? Explain your answer [3 marks]
v) Photochromic glass is a glass that is sensitive towards light.
State one use of photochromic glass and explain its use [3marks]

15. No. Answers Marks
QUESTION 1
1.a (i) Contact process 1
(ii) Vanadium(V) oxide 1
(iii) Oleum 1
(iv) SO3 + H2SO4  H2S2O7 2
1m 1m
1.b(i) Temperature: 450-550oC 1
Pressure : 200atm 1
Catalyst : Iron 1
bii) - Manufacturing of fertilizer 1
- Manufacturing of nitric acid 1
QUESTION 2
2.(A) a X – anode 1
Y - cathode
2.b Electrical energy to chemical energy 1
2+ - + -
2.c Cu , NO3 , H , OH 2
d(i) Colourless gas released 1
d(ii) Brown solid deposited 1
2(B)a (i) 2Br-  Br2 + 2e- 1
2+ -
(ii) Pb + 2e  Pb 1
b) (i) anode : Bromine gas 1
(ii) cathode: Lead metal 1
QUESTION 3
3(A)
a) Zinc: negative terminal 1
Copper: positive terminal
b) - allow the movement of ions between two solution 1
- prevent two solutions from mixing 1
c) Electrode becomes thinner 1
d) Cu2+ + 2e-  Cu 1
e) - Voltmeter reading decrease 1
- distance between Zn and Fe is shorter than Zn and Cu in Electrochemical Series 1
3(B)
Functional
diagram-1
m
Correct
electrode-1
m
Correct
electrolyte-
1m
SKEMA JAWAPAN FORM 4 (SELARAS 1 SEM2 2011):

16. Essay:
No. Answers Marks
a)i) A mixture of metals in a fixed composition to improve the properties of 1
a particular metal
a)ii) • Substance A: Pure metal; substance B: Alloy 1
• In pure metal, atoms are the same size 1
• The atoms are in orderly arrangement 1
• The layers of atoms in pure metal can slide over one another when
force is given 1
• In alloy, different atoms have different size 1
• The presence of atoms of other metals disturb the orderly
arrangement of atoms in the metal 1
• 1
• This prevent the layer of atoms from sliding when force is given
a)iii) -Stronger and harder
-Resistant towards corrosion Any 2
-Have a better furnish and lustre (2marks)
b)i) Polymer: Polythene 1
Monomer: Ethene 1
b)ii) - Reduce ,reuse and recycle synthetic polymer 1
- Use biodegradable polymers 1
b)iii) - Borosilicate glass // Fused glass 1
- Resistant towards chemical attack 1
- Heat resistant 1
b)iv) - Use: Optical lenses, car windshields, smart energy efficient windows 1
in buildings, information display panels, lens in cameras, optical 1
switches and light intensity meters 1
- Because it darkens the glass when exposed to sunlight
-due to presence of silver chloride

17. Objectives
1 2 3 4 5 6 7 8 9 10
B C A B C D A D B A
11 12 13 14 15 16 17 18 19 20
B B B A A B B C A B