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SULIT 4541/3/PP

@ 2012 Hak Cipta MPSM Pahang 1 [ Lihat halaman sebelahSULIT

4541/3/PPPeraturan PermarkahanKimiaKertas 3OKT/NOV 2012

MPSM PAHANG

MARKING SCHEME

PEPERIKSAAN PERCUBAAN SPM 2012

TINGKATAN 5

CHEMISTRY

Paper 3

Kertas skema permarkahan ini mengandungi 14 muka surat bercetak.

Amaran

Peraturan pemarkahan ini adalah SULIT.


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Question Mark scheme score

1(a) Able to state three observations.

Sample answer

Test tube I Intensity of blue colour produce is very high //

- Does not produce pink colour.

Test tube II Intensity of pink colour produce is very high //

- Does not produce blue colour.

Test tube III intensity of blue colour produce is very high //

- Does not produce pink colour.

3

Able to state any two correct observations. 2

Able to state any one correct observation 1

No response or wrong response 0

1(b) Able to state one inference for each experiment

Sample answer:

Test tube I : iron rust/oxidised // iron atom released electron//

iron(II) ions/ Fe2+ formed// iron(II) ions

present// rusting occur

Test tube II : iron does not rust// iron(II) ions are not present

// zinc corrode // zinc atom release

electron// zinc ions formed // zinc oxidised

Test tube III : iron rust/oxidised // iron atom released electron

// iron(II) ions/ Fe2+ formed // iron(II) ions

present // rusting occur

3

Able to state any two inferences 2

Able to state any one inference 1


1(C Able to state the hypothesis accurately

Sample answer:

When a more/ less electropositive metal is in contact with

iron/ferum/Fe, the metal inhibits/ (speeds up) rusting/ corrosion

of iron //

3


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When a more/ less electropositive metal is in contact with

iron/ferum/Fe, rusting of iron/ferum/Fe is slower/faster

If the metal in contact with iron is higher/lower than

iron/ferum/Fe in electrochemical series, the rusting/corrosion of

iron is slower/faster//

The higher/lower the metal in contact with iron in

electrochemical series/than iron/ferum/Fe, the rusting/corrosion

of iron/ferum/Fe is slower/faster

Able to state the hypothesis correctly

Sample answer:

When a more/less electropositive metal, the metal inhibits/

(speeds up) rusting/corrosion of iron//

If the metal in contact with iron is higher than iron/ferum/Fe in

reactivity series, the rusting/corrosion of iron is slower/faster//

The rusting of iron/ferum/Fe is faster/slower, if a less / more

electropositive metal is in contact with iron/ferum/Fe

2

Able to state the idea of hypothesis

Sample answer

Different metal in contact with iron, will cause iron to rust//

Metal can cause iron to rust.

1


1 (d) Able to state the three variables correctly

Sample answer:

(i) Manipulated variable:

Type/different metals// position of metal in

electrochemical series

(ii) Responding variable:

3


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Rusting/ corrosion// presence of blue/pink colour

(iii) Constant variable:

Size/mass of iron nail// type of nail// clean iron nails//

temperature// medium in which the iron nails are kept

Able to state any two variables correctly 2

Able to state any one variable correctly 1


1(e) Able to give the operational definition accurately.

Sample answer:

When iron is in contact with metal lower than iron in

electrochemical series, blue colouration indicates rusting//

Rusting occurs when iron nail is in contact with copper/tin/less

electropositive metal and form blue colouration//

Blue colouration is formed when iron is in contact with metal

lower than iron in electrochemical series.

3

Able to give the operational definition correctly.

Sample answer:

Blue colouration indicates rusting//

Rusting occurs when iron nail is contact with copper/tin/less

electropositive metal

2

Able to give an idea of the operational definition.

Sample answer:

Rusting occurs when the colour of solution changes.//

Rusting occurs.

1



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1(f) Able to predict any one the observations based on the

laboratory experiment correctly

Sample answer:

Intensity of blue colour higher //

Iron nail becomes smaller//

Lead strip remains unchanged

3

Able to predict one observation less correctly

Sample answer:

Pink spot/colouration

2

Able to give an idea of observation

Sample answer:

Iron rusts // brown deposit/spot

1


Question Details Score

2.a) Able to record all readings accurately to one decimal point with

unit.

Sample answer:

Set Initial thermometer

reading,C

Highest thermometer

reading,C

I 27.0 53.0

II 29.0 57.0

III 27.0 59.0

3

Able to record all readings correctly.

# readings to one decimal point without unit.

# readings without decimal point with / without unit.

Sample answer:


reading

Highest thermometer

reading

I 27.0 53.0

II 29.0 57.0

III 27.0 59.0

2


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OR


reading

Highest thermometer

reading, C

I 27 53

II 29 57

III 27 59

Able to record three or five readings correctly 1


Question Details Score

2.b) Able to construct a table to record the initial temperature of

water, highest temperature of water and increase in temperature

for Set I, Set II and Set III

1.correct titles

2. readings and units

Sample answer:

Set I II III

Initial temperature, C 27.0 29.0 27.0

Highest temperature, oC 53.0 57.0 59.0

Increase in temperature, oC 21.0 29.0 32.00

3

Able to construct a less accurate table that contains the

following:

1. Titles

2. Readings

Sample answer:


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I II III

Initial temperature 27C 29 27C

Highest temperature 53.0 57.0 59.0

Increase in temperature 26C 28 32C

2

Able to construct a table with at least one title/ reading.

Sample answer :

I II III

Increase in temperature

1


2.c) Able to sketch the graph of heat of combustion of alcohols

against number of carbon atoms per molecule.

The graph must have the following information:

1. The axes are labeled correctly

2. Correct unit

3. Correct curve

Sample answer:3


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Able to sketch the graph of heat of combustion against number

of carbon atoms

i. without units on y-axis

ii. correct curve

sample answer:2

Able to sketch the graph with only one correct information.

Sample answer:

1

Heat of combustion, KJmol-1

1 2 3 4

Number of C atom per molecule

Heat of combustion

1 2 3 4Number of carbon atom


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Or


2.d) Able to state three correct information from the diagram.

Sample answer:

1. The reaction is an exothermic reaction // heat energy is

released to the surrounding.

2. 726 KJ of heat is released when one mole of methanol is

burnt.

3. Total energy of reactant is higher than the products.

3

Able to state any two correct information. 2

Able to state any one correct information. 1

No response or wrong response. 0

2.e) Able to classify all carbon compounds correctly.

Sample answer:

Hydrocarbon Non-hydrocarbon

Ethene, C2H4 Propanol, C3H7OH

Methanoic acid, HCOOH

Prophyl ethanoate,

CH3COOC3H7

3

Heat of combustion KJmol-1

Number of C atom


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Able to classify at least three carbon compounds correctly. 2

Able to classify any one carbon compound correctly. 1

No response or wrong response. 0

Question

Number

Rubric Score

3(a) Able to give the statement of problem correctly.

Sample answer:

Does all nitrate, sulphate, carbonate and chloride salts aresoluble in water?

3

Able to give the statement of problem correctly.

Sample answer:

Does all salts are soluble in water?

2

Able to give the statement of problem correctly.

Sample answer:

Salt are soluble and insoluble in water

1



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3(b) Able to state all variables correctly

Sample answer:

Manipulated variable: Type of salt

Responding variable: Solubility of salt

Constant variable: volume of water/ mass of

salt/temperature

3

Able to state any two variables above correctly 2

Able to state any one variables above correctly 1


3 Able to give hypothesis accurately.

Sample answer:

Some of salts soluble in water but other salts insoluble in water// all nitrate salts are soluble in the water but the other saltsinsoluble in water.

3

Able to give the statement of hypothesis correctly.

Sample answer:

All nitrate salt are soluble in water

2

Able to give idea of hypothesis.

Sample answer:

Different salts produce different solubility in water

1



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3(d) Able to list completely the materials and apparatus

Sample answer:

Material:

1. Any suitable nitrate, sulphate, carbonate and chloride

salts soluble and insoluble in water

2. Distilled water

Apparatus:

1. Test tube

2. Spatula

3

Able to list incompletely materials and apparatus.

Sample answer:

Materials:

1. Incomplete salt :

List only 3 type of salt Eg zinc nitrate, lead (II) sulphate,

calcium carbonate

2. Distilled water

Apparatus:

1. Test tube

2. Spatula

2

Able to give an idea of materials and apparatus.

Sample answer:

Materials:

1. Incomplete salt :

List only 2 type of salt Eg zinc nitrate, plumbum (II)

sulphate, calcium carbonate

1


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2. No distilled water

Apparatus:

1. Test tube

2. Spatula


3 (e) Able to state all procedures completely and correctly

Sample answer:

1. Half a spatula of (nitrate salt) powder is added in a test

tube

2. Pour 5 cm3 of distilled water into the test tube

3. Shake the test tube.

4. Observe the solubility of salt and record in the table.

5. Experiment is repeated using various salt powder.

3

Able to state procedures incompletely.

Sample answer:


tube


3. Observe the solubility of salt and record in the table.

2

Able to give an idea of the procedure.

Sample answer:


tube

1


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3(f) Able to exhibit the tabulation of data correctly.

Sample answer:

Salt Solubility of salt in water

Zinc nitrate

Magnesium chloride

Sodium chloride

Lead (II) sulphate

Copper (II) sulpahte

Potassium carbonate

2

Able to exhibit the tabulation of data less accurately.

Sample answer:

Salt Solubility of salt in water

1


END OF MARKING SCHEME

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