SPM Chemistry Paper 3 2011

1CHEMISTRY PAPER 3 4541/3

Question No. 1

Question No. 2

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PENSKORAN // SCORING

2011Question no. 1(a)(i)

Score 3: Able to state the OBSERVATION correctly

Sample answer

2

1. ‘X’ disappears from sight //

2. ‘X’ cannot be seen //

3. Yellow precipitate //

4. Yellow solid //

5. Solid cover ‘X’ //

6. Precipitate cover ‘X’

2011Question no. 1(a)(ii)

Score 3: Able to state the INFERENCE correctly

3

Sample answer

1. Sulphur is formed //

2. Rate of reaction in Set I is higher //

3. Rate of reaction in Set IV is the lowest //

2011Question no. 1(b)

Score : Able to state all three VARIABLES

Sample answer

4

Manipulated variable:Concentration of sodium thiosulphate solutionReject: concentrated

Responding variable:Time taken ‘X’ to disappear // Rate of reaction

Constant variable:Volume of sodium thiosulphate solution // Volume and concentration of hydrochloric acid // Volume/size of conical flask // temperature //Hydrochloric acid // sodium thiosulphate

2011Question no. 1(c)

Score 3: Able to state the relationship between manipulated variable and the responding variable and state the direction

Sample answer

The higher the concentration of sodium thiosulphate solution, the higher the rate of reaction //

5Note: MV + RV + direction

The higher the concentration of sodium thiosulphate solution, the shorter the time taken for ‘X’ disappear

2011Question no. 1(d)

Sample answer

1. The time taken for the yellow precipitate to form, until ‘X’ mark is disappear / not seen

6

What have been done

What did you see

Score 3: Able to give the OPERATIONAL DEFINITION accurately

2011Question no. 1(e)(i)

Score 3: Able to write all the time taken and calculate the value 1/time to two decimal places

Sample answer

7

Set II III IV

Time (s) 25 33 50

1/time (s-1) 0.04 0.03 0.02

2011

1. Both axes are labell and with units

2. Uniform scale

3. All points are transferred correctly

4. Best fit straight line

5. The size of graph must be more than 30% of the graph paper

8

Question no. 1(e)(ii)

Score 3: Able to PLOT A GRAPH correctly which fulfills all the following criteria

2011Question no. 1(f)(i)

Score 3: Able to PREDICT the relationship between the concentration of sodium thiosulphate solution and the rate of reaction correctly

Sample Answer

9

The higher the concentration of sodium thiosulphate solution, the rate of reaction increase

Score 1: The higher the concentration of sodium thiosulphate solution, the rate of reaction decrease

2011Question no. 1(f)(ii)

Score 3: Able to fulfill the following criteria

Sample answer

10

1. Extend the line on the graph

2. Show on the graph the way to obtain the value

3. State the time with unit

PLOT YOUR GRAPH NOW

2011Question no. 1(f)(ii)

Score 3: Able to sketch the graph of volume of hydrogen gas against time

Sample answer

11

Concentration of sodium thiosulphate solution (mol dm3)

1/time (s-1)

X-axis & Y-axis without unit : Score 2Reverse axis, correct shape: Score 2Reverse axis, wrong shape : Score 1

0.02

X

[15.0 ≤ X < 20]

2011Question no. 1(g)

Score 3: Able to EXPLAIN with comparison by referring to the height/quantity of precipitate formed in a certain time correctly

Sample answer

1. Smaller/less quantity of precipitate needed to cover ‘X’

2. The precipitate formed higher/thicker

12

2011Question no. 1(h)

Score 3: Able to CLASSIFY all ions correctly

Sample answer

13

Anions Cations

Cl- OH-

S2O3 2-

Na+ H+

If state reversible: Score 1

2011Question no. 2(a)

Score 2: Able to state the PROBLEM STATEMENT of the experiment correctly

Sample answer

14

How to construct an ionic equation for the formation of lead(II) iodide / PbI2

If state ‘Aim’: Score 1

2011Question no. 2(b)

Score 3: Able to state three variables correctlySample answer

15

Manipulated variable:Volume of potassium iodide solution

Responding variable:Height of precipitate formed

Constant variable:1. Volume of concentration of lead(II) nitrate solution //2. Concentration of potassium iodide solution //3. Size of test tube //4. Temperature

2011Question no. 2(c)

Sample answer

16

When the volume of potassium iodide solution increases, the height of precipitate formed increases the until maximum / no change / constant

Score 3: Able to state the relationship between manipulated variable and responding variable and the direction correctly

Reverse RV and MV with direction : Score 2

MV

RVdirection

2011Question no. 2(d)

Score 3: Able to list complete substances and apparatusSample answer

17

Substances:1. Lead(II) nitrate (0.1 – 0.2 mol dm-3 )2. Potassium iodide (0.1 – 0.2 mol dm-3 )

Apparatus:1. Ruler 2. Test tube 3. Test tube rack4. Stopper / glass rod5. Burette / pipette / syringe

2011

Score 3: Able to state all the step in the procedure correctly Sample answer

18

1. Label test tubes and put in the rack

2. Pour (4 – 6 cm3 ) of lead(II) nitrate solution into the test tube

3. Pour 1cm3 of potassium iodide solution into the first test tube, 2cm3 of potassium iodide solution into second test tube until the 8th test tube.

4. Shake the test tube // stir the test tube

5. Leave the test tube

6. Measure and record the height of precipitate

Question no. 2(e)

KEY WORD jangan lupaProcedure:

2011

Score 3: Able to tabulate the data with the following aspects

Sample answer

19

Question no. 2(f)

1. Correct titles with units 2. Complete list of volume to two decimal points

Test tube 1 2 3 4 5 6 7 8

Volume of lead(II) nitrate solution (mol dm-3

)5.00 5.00 5.00 5.00 5.00 5.00 5.00 5.00

Volume of potassium iodide solution (mol dm-3

)1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00

Height (cm3)

Value untuk ‘volume’ sudah dinyatakan dlm ‘procedure’

20

Thank Thank YouYou

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