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Selaras 3 form 4 2011=dgn jawapan=terkini
 

Selaras 3 form 4 2011=dgn jawapan=terkini

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Test on electrochemistry and manufactured substance in industry

Test on electrochemistry and manufactured substance in industry

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    Selaras 3 form 4 2011=dgn jawapan=terkini Selaras 3 form 4 2011=dgn jawapan=terkini Document Transcript

    • 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 HOURSINSTRUCTIONS: 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 Questions1 The equation shows the reaction of nitrogen, N2 and hydrogen, H2 to form ammonia, NH3.
    • 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 62. 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 Iron3. 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 Nylon4. Which of the following substances is found in a photochromic glass? A Plastic and ceramic
    • B Glass and silver chloride C Plastic and sodium chloride D Ceramics and silver chloride5. 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 H2SO46. 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 steel7. 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 packed8. Why is ceramic used for the wall of a nuclear reactor A. ceramic is very hard
    • B. Ceramic is malleable C. Ceramic is inert towards chemicals D. Ceramic can with stand high temperature9 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 Copper10. 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 carbonate11. Which of the following substance is electrolyte? A. Alcohol B. Copper(II) chloride C. Glucose solution D. Mercury12. Figure 1 shows the set-up of apparatus for the electrolysis of ferum(II) sulphate solution.
    • 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 gas13. 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 form14. 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
    • Copper foil Silver foil Sodium Silver nitrate sulphate solution solution Figure 315. 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.
    • 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 solutions20. In the electrolytic manufacture of aluminium, what is the anode (positive electrode) made of? A. copper B. graphite C. platinum D. steel
    • SECTION B: SUBJECTIVES1 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]
    • (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]
    • 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]
    • 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]
    • ________________________________________________________________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]
    • SECTION C:Essaya) i) Explain the meaning of alloy [2 marks]
    • 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]
    • No. Answers MarksQUESTION 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 1QUESTION 22.(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 1QUESTION 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- 1mSKEMA JAWAPAN FORM 4 (SELARAS 1 SEM2 2011):
    • Essay:No. Answers Marksa)i) A mixture of metals in a fixed composition to improve the properties of 1 a particular metala)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 givena)iii) -Stronger and harder -Resistant towards corrosion Any 2 -Have a better furnish and lustre (2marks)b)i) Polymer: Polythene 1 Monomer: Ethene 1b)ii) - Reduce ,reuse and recycle synthetic polymer 1 - Use biodegradable polymers 1b)iii) - Borosilicate glass // Fused glass 1 - Resistant towards chemical attack 1 - Heat resistant 1b)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
    • Objectives1 2 3 4 5 6 7 8 9 10B C A B C D A D B A11 12 13 14 15 16 17 18 19 20B B B A A B B C A B