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Steps and guide to answer Chemistry (Paper 3 - Section B) Report Writing. Consists of 3 experiments from Chapter 3, Form 4.
CONFIDENTIAL Chemistry 4541/3 October 2014 1 Hour 30 minutes
1
4541/3 Name
:_________________________________
I/C No.
:_________________________________
Class.
:_________________________________
FINAL EXAMINATION
SECONDARY 4
CHEMISTRY Paper 3 1 HOUR 30 MINUTES
DO NOT OPEN THIS BOOKLET UNTIL INSTRUCTED 1. This question paper consists of two questions:
Question
Question 1 and Question 2. 2. Answer all the questions. You may use
equations, diagrams, tables, graph, and other suitable method to explain your answer.
Full Mark marks obtained
1
33
2
17
Total
50
3. The diagrams in the questions are not drawn
to scale unless stated. 4. The marks allocated for each question or subpart of a question is shown in brackets. 5. You may use a non-programmable scientific calculator. 6. You are advised to spend 45 minutes to answer Question 1 and 45 minutes for
Question 2.
Prepared by Checked by Approved by
: Mrs. Wan Nurul Aini Wan Nor Yuhaidi : Mr. Tan K. K. : Mrs. Hariah Muhi This question paper consists of 6 printed pages
4541/3
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CONFIDENTIAL
2
4541/3 Answer all questions.
1
Diagram 1.1 shows the apparatus set – up for an experiment to construct the electrochemical series based on the potential difference between pairs of metals in a simple voltaic cell. Copper plate is paired with zinc, lead, iron, aluminium and magnesium metals in Cell I, Cell II, Cell III, Cell IV and Cell V respectively. In each cell, copper acts as the positive terminal.
Diagram 1.1 Diagram 1.2 shows the voltmeter readings of each cell.
Record the voltmeter readings of each cell in the spaces provided in Diagram 1.2. [3 marks]
(b)
Complete the table to record the cell voltage and negative terminal in each of these cells.
Cell I II III IV V
Pair of metals Zink – Copper Lead – Copper Iron – Copper Aluminium – Copper Magnesium - Copper
Negative terminal
Cell voltage/V
[3 marks]
(c) 4541/3
State three observations and the corresponding inferences in Table 1.1. The [Please turn over CONFIDENTIAL
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observations should not include the deflection of voltmeter needle. Observation
Inference
Negative terminal
Positive terminal
Colour of the solution
[6 marks] (d) State one hypothesis for this experiment. ……………………………………………………………………………………… ………………………………………………………………………………………... [3 marks] (e)
For this experiment, state the: (i) manipulated variable : ……………………………………………………... (ii) responding variable : ……………………………………………………... (iii) constant variable : ……………………………………………………... [3 marks]
(f)
State the operational definition for the position of metals in the electrochemical series. ……………………………………………………………………………………… ………………………………………………………………………………………... [3 marks] (g) Arrange the six metals in descending order of electropositivity. ……………………………………………………………………………………… [3 marks] 4541/3
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CONFIDENTIAL (h)
5
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(i) The experiment is repeated using another copper plate to pair with the copper plate. Predict the voltmeter reading.
………………………………………………………………………………….. [3 marks] (ii) Explain the answer in 1(h)(i). ………………………………………………………………………………… ………………………………………………………………………………….. [3 marks] (i) Classify the ions present in the electrolyte of copper (II) sulphate in this experiment by completing Table 1.2. Anions
Cations
(i)
(iii)
(ii)
(iv) [3 marks]
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6
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Diagram 2 shows the apparatus set – up for titration of 25.0 cm3 of 1.0 mol dm-3 of potassium hydroxide, KOH solution with dilute hydrochloric acid, HCl. Phenolphthalein is used as an indicator.
Dilute hydrochloric acid
Potassium hydroxide + phenolphthalein Diagram 2 Based on this situation, plan one experiment in the laboratory to determine the concentration of hydrochloric acid by finding the end point of titration. Your planning should include the following aspects. (a) (b) (c) (d) (e) (f)
Aim of the experiment Statement of the hypothesis All the variables List of substances and apparatus Procedure of the experiment Tabulation of data [17 marks]
END OF QUESTION PAPER
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4541/3
ANSWER SCHEME CHEMISTRY FINAL EXAMINATION SECONDARY 4 (PAPER 3)
