Electrochemistry Learn Mindset Africa-PDF Free Download

Electrochemistry learn mindset africa
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1 1 Apart from concentration write down TWO other conditions needed for the. hydrogen half cell to function at standard conditions 2. 1 2 Write down the name of the item of apparatus labelled X 1. 1 3 Is magnesium the ANODE or CATHODE in the cell above Refer to the. relative strengths of reducing agents to explain the answer 4. 1 4 Write down the cell notation for this cell 3, 1 5 Calculate the standard reduction potential of the magnesium half cell. Show ALL your working 4, 1 6 Write down the balanced NET overall cell reaction that takes place in this cell. No spectator ions are required 3, A learner adds a few drops of Universal indicator to the hydrogen half cell She notices that. while the cell is working the colour of the indicator changes regularly at first but then remains. 1 7 1 What would you expect to happen to the pH of the solution from the time. the cell starts work till there is no change in the indicator colour 2. 1 7 2 Explain why the indicator colour stops changing 3. Question 2, Adapted from DBE Feb 2013 Paper 2 Question 9. The simplified diagrams below represent two electrochemical cells A and B used in. INDUSTRY Cell A is used in the purification of copper ore containing silver and platinum. impurities Cell B is used to electroplate a bracelet with a layer of copper. 2 1 Write down the name of the type of electrochemical cell ELECTROLYTIC. or GALVANIC of which the above two cells are examples 1. 2 2 Pure copper is used as one of the electrodes in each of the cells above. In which cell A or B is the pure copper the, 2 3 Consider cell B Initially the CuSO4 aq has a blue colour.
2 3 1 How will the intensity of the blue colour change whilst the cell is. functioning Write down INCREASES DECREASES or REMAINS THE. SAME Give a reason for the answer 3, 2 3 2 Write down the half reaction that takes place at the pure copper electrode 2. 2 4 Consider cell A, 2 4 1 Give a reason why the sludge formed in this cell is of economic. importance 1, 2 4 2 Name ONE negative impact that the energy usage in this process. has on the environment 2, Question 3, Adapted from DBE Nov 2011 Paper 2 Question 10. The simplified diagram of a membrane cell used in the chlor alkali industry is shown below. Gas A gas B and compound C are the three major products formed during this process X. and Y represent the two electrodes, Write down the function of the membrane in this cell 1.
Which electrode X or Y is connected to the positive terminal of the power supply Briefly. explain how you arrived at the answer, Write down the NAME or FORMULA of. Compound C 1, Write down the balanced net overall cell reaction taking place in this cell. The chlor alkali industry is sometimes blamed for contributing to the greenhouse effect. Briefly explain how the above cell contributes to the greenhouse effect. Question 4, Adapted from DBE Nov 2010 Paper 2 Question 8. The cell notation of a standard galvanic voltaic cell containing an unknown metal electrode. X is shown below, X s X 1 mol dm Pb 1 mol dm Pb s, 4 1 Name the component of the cell represented by the double vertical lines. in the above cell notation and explain its function 3. 4 2 Identify the oxidising agent in the above cell 1. 4 3 The initial reading on a voltmeter connected across the electrodes of the above. cell is 1 53 V Identify metal X by calculating the standard reduction potential of the. unknown metal X 5, 4 4 Write down the balanced equation for the net overall reaction taking place.
in this cell Omit the spectator ions 3, 4 5 How will the initial voltmeter reading be affected if the concentration of the. electrolyte in the X s X aq half cell is increased Write down only INCREASES. DECREASES or REMAINS THE SAME 2, Question 5, Adapted from DBE Nov 2013 Paper 2 Question 8. The diagram below shows a galvanic cell operating under standard conditions The cell. reaction taking place when the cell is functioning is. 6C aq 2Au aq 3C 2 g 2Au s, With switch S OPEN the initial reading on the voltmeter is 0 14 V. 3 1 Write down the, 3 1 1 NAME or FORMULA of the oxidising agent 1. 3 1 2 Half reaction which takes place at the anode 2. 3 1 3 Cell notation for this cell 3, 3 2 Calculate the standard reduction potential of Au 4.
Switch S is now closed and the bulb lights up, 3 3 How will the reading on the voltmeter now compare to the INITIAL reading of 0 14 V. Write down only LARGER THAN SMALLER THAN or EQUAL TO Give a reason for. the answer 2, SOLUTIONS TO ELECTROCHEMISTRY, Question 1. 1 1 Pressure 101 3 kPa 1 013 x 105 Pa Temperature 25 C 298 K. 1 2 Salt Bridge, 1 3 Anode Mg is a stronger reducing agent than H2 and therefore Mg will be oxidised. 1 4 Mg s Mg2 1 mol dm 3 H 1 mol dm 3 H2 g Pt s, 1 5 E cell E cathode E anode. 2 36 0 00 E anode, E anode 2 36 V, 1 6 Mg s 2H aq Mg2 aq H2 g.
Question 2, 2 1 Electrolytic, 2 3 1 Remains the same. 2 3 2 Cu Cu2 2e, 2 4 1 It contains precious metals. 2 4 2 Consumes large amount of electricity energy Depletes coal resources OR. Contributes to global warming OR Habitats destroyed in mining of coal OR. Contributes to acid rain, Question 3, 3 1 Allows only positive ions cations Na ions to migrate to cathode half cell. 3 2 Y Chloride ions are oxidised at Y, 3 3 3 NaOH, 3 4 2H2O 2C H2 2OH C 2. 3 5 Uses large amounts of electricity energy Combustion of coal during generation of. electricity releases huge amounts of carbon dioxide into atmosphere. Question 4, 4 1 Salt Bridge, 4 2 Concentration of the electrolyte 1 mol dm 3.
Temperature 25 C 298 K, 4 4 Eocell Eocathode Eoanode. 1 53 0 13 Eoanode, Eoanode 1 66 V, unknown metal X is A. 2A 3Pb2 2A 3 3Pb, 4 5 Decreases, Question 5, 5 1 2 2C C 2 2e. 5 2 Pt s C 1 mol dm 3 C 2 g Au3 1 mol dm 3 Au s, Eocell Eocathode Eoanode. 0 14 Eocathode 1 36, Eocathode 1 50 V, 5 3 Smaller than Decrease or drop in potential difference or voltage due to internal.
Exam Questions Question 1 Adapted from DBE Feb 2013 Paper 2 Question 8 The galvanic cell represented below consists of a hydrogen half cell and a magnesium half cell at standard conditions The reading on the voltmeter is 2 36 V

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