spm trial 2012 chemistry qa pahang

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SULIT 4541/1/PP 4541/1/PP PERATURAN PERMARKAHAN CHEMISTRY Kertas 1 OKT/NOV 2012

MAJLIS PENGETUA SEKOLAH MALAYSIA NEGERI PAHANG

PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN TAHUN 2012

CHEMISTRY Tingkatan 5

SKEMA KERTAS 1

MAKLUMAT UNTUK PEMERIKSA KERTAS

1. Kertas skema ini mengandungi 50 jawapan untuk soalan objektif. 2. Kertas skema ini adalah sulit sehinggalah tamat peperiksaan percubaan SPM 2012. 3. Terima kasih.

Kertas skema ini mengandungi 2 halaman bercetak

© 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT


`

SULIT 4541/1

Marking sheme Chemistry Paper 1 Form 5

( TRIAL EXAM 2012 @ MPSM Pahang)

© 2012 Hak Cipta MPSM Pahang [ Lihat halaman sebelah

SULIT

No. Soalan

Answer No.

Soalan Answer

No. Soalan

Answer No.

Soalan Answer

1 A 14 C 27 C 40 B

2 C 15 C 28 B 41 B

3 D 16 C 29 B 42 A

4 D 17 D 30 D 43 A

5 C 18 C 31 C 44 C

6 C 19 C 32 B 45 C

7 C 20 C 33 C 46 D

8 A 21 B 34 A 47 C

9 D 22 B 35 B 48 D

10 D 23 B 36 A 49 C

11 B 24 D 37 B 50 C

12 D 25 A 38 A

13 A 26 C 39 A


SULIT 1 4541/2/PP

@ 2012 Hak Cipta MPSM Pahang [Lihat halaman sebelah SULIT

4541/2/PP Peraturan Permarkahan Chemistry Kertas 2 Okt/Nov 2012

MPSM PAHANG

PEPERIKSAAN PERCUBAAN SPM TAHUN 2012

TINGKATAN 5

CHEMISTRY

Kertas 2

PERATURAN PEMARKAHAN

_____________________________________________________________________

Kertas skema ini mengandungi 10 halaman bercetak

Amaran

Peraturan pemarkahan ini adalah SULIT.


SULIT 2 4541/2/PP


MARKING SCHEME / SKEMA PERMARKAHAN

CHEMISTRY PAPER 2

TRIAL SPM MPSM PAHANG 2012

NO Answers Marks

1.a)

b)(i)

(ii)

c)

d)(i)

(ii)

e)(i)

CR3RH R6

CRnRH R2n+1 ROH

CR3RH R7 ROH CR3RHR6 R + HR2R0

H H H H H H

H- C –C- C - H

H – C – C – C -O H

H H H H OH H

Propan-1-ol Propan-2-ol

(any one)

Propane

CR3RH R6R + HR2 R CR3RHR8R

-Formula reactant correct

-Formula product correct

Propyl ethanoate

1

1

1

1+1

1

1

1

1

9

2.a)

(i)

(ii)

Number of proton in nucleus of its atom

15

1

1

b) Nucleon number 1

c)(i) Q and R have different number of neutron/nucleon number 1

(ii)

Carbon 14 - to estimate the age of fossils and artifacts

Cobalt 60 - kill cancer cells,sterilised medical instruments

Sodium 24-detect leakage of underground pipes

(any one)

1

d (i)

(ii)

iii)

2.8.7

7

Draw diagram:

-

1

1

R


SULIT 3 4541/2/PP


- Figure of electron arrangement of R

3 shells

1

1

9

3.a)

( i)

(ii)

(iii)

b)

c)

d)

e)

f)

g)

Z

Q

Y

Q, P, Z, Y, T

4

Z has higher number of protons than T. Hence it has stronger

nuclei attraction on the electrons.

YP

3+

Transition Elements

Their ions or compounds are colored//They form complex

ions or compounds/they are good catalysts//They can have

variable oxidation.

1

1

1

1

1

1 + 1

1

1

1

10

4.a)

b.(i)

(ii)

(c)

d)(i)

(ii)

e)

HP

+P , Cu P

2+P ,

SOR4RP

2-P , OHP

-

Bubbles of gas released

Concentration of Cu P

2+P decrease // Cu P

2+P

discharge to form Cu atom

Cu P

2+P + 2e Cu

Anode become thinner / smaller / mass

decrease

Cathode become thicker / bigger / mass

increase

Correct diagram

Copper electrode at anode

Steel spoon at cathode

Copper (II) sulphate as electrolyte

Correct label

1

1

1

1

1

1

1

1

1


SULIT 4 4541/2/PP


f)

Hydroxide ion 1

10

5.a)

b)

c)

d)

e)

f)

g)

Pink to colourless

The point in the titration at which the indicator changes

colour

HR2RSOR4 R + 2NaOH NaR2RSOR4R + 2HR2RO

Sodium sulphate and water

MR1RVR1 R = U 1

MR2RVR2 R 2

U0.25 × VUR1R = 1 0.5 × 25 2

VR1 R= U1 × 0.5 × 25 2 × 0.25

= 25cmP

3

50 cmP

3

i) Vinegar is used to cure wasp sting that alkaline in nature

ii) Toothpaste contain bases to neutralize acid produce by

bacteria

1

1

1+1

1

1

1

1

1

1 + 1

11

6.

a)

b)

c)

d)

Redox reaction is a reaction in which oxidation and reduction

occur at the same time

Oxygen and water

Fe → FeP

2+P + 2e

Label of water droplet, oxygen and iron

Label of anode and cathode

Draw arrow from negative to positive pole iron

1

1

1

1

1

1


SULIT 5 4541/2/PP


e)

f)

Electron transfer form anode to cathode

Oxygen in water gains electrons

Hydroxide ion is form

Using sacrificial metal // sacrificial protection /

By alloying /

By tin platting /

By galvanizing

(Any two)

1

1

1

1+1

11

7

a)

Correct axis with unit

Correct and Smooth line

Correct scale

1

1

1

0

1

2

3

4

5

6

1 2 3 4 5 6 7

hei

ght

of

pre

cip

itat

e/ c

m


SULIT 6 4541/2/PP


b.

(i)

(ii)

c)

d.(i)

(ii)

iii)

Pb(NOR3R)R2 R + 2KI PbIR2R + 2KNOR3

Volume of Pb(NO R3R)R2 R= 2.5 cmP

3

No of mole Plumbum (II) ion = 1 x 0.0025 = 0.0025 mol

No of mole iodide ions = 2 x 0.0025 = 0.005 mol

PbP

2+P +2 IP

-P PbIR2R

Correct reactants and products

Balance equation

Salt X = Copper (II) carbonate

Gas Z = Carbon dioxide

Y precipitate = Barium sulphate

CuSOR4R + Ba(NOR3R)R2 R Cu(NOR3R)R2 R + BaSOR4R

Correct reactants and products

Balance equation

1. Add sodium hydroxide solution.

2. Blue precipitate formed indicates the presence of Cu P

+P ion.

3. Add hydrochloric acid.

4. Add barium chloride solution.

5. White precipitate formed indicate the presence of SO R4RP

2-P

ion.

1 + 1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

20

8.

a)

1. the mixture becomes hot 2. the thermometer reading increase

3. zinc powder dissolves

4. brown solid/precipitate formed

5. the blue solution turn colourless (Any three)

1+1+1


SULIT 7 4541/2/PP


(b)(i)

(ii)

(iii)

(iv)

c) (i)

Cu P

2+ P+ Zn Cu + ZnP

2+

-Correct formula & reactants

-correct balance

Heat released in the reaction

-50x4.2x5// 1050 J

-number of mol of Cu atom

U50x0.1U//0.005 mol

1000

-show the step to obtain heat of displacement

U1050 J

0.005 mol

- heat of displacement with unit and negative symbol

-210000 Jmol P

-1P//-210 kJmolP

-1

-heat loss to the surrounding

U2 precautions

1. use polysterene cup//use two layers of polysterene cup

Instead of one.

2. add zink powder quickly into the solution

3. stir the mixture continuously until highest temperature

obtained.

(Any two)

- temperature change will be doubled//10 P

0PC

- number of copper(II) ions per unit is doubled/ two times

higher

Label Energy, correct level of reactants & product

- correct chemical equations

- H with negative symbol and unit

Zn + CuP

2+

H= - 210 kJ molP

-1P

Energy

ZnP

2+P + Cu

1

1

1

1

1

1

1

1+1 1

1

1

1

1


SULIT 8 4541/2/PP


(ii)

Exothermic reaction//heat released to the surrounding

Energy content of reactants is higher than energy

content of products

Heat absorbed to break down the bond is lower than

heat released to form a bond

1

1

1

20

9

a.(i)

(ii)

b.

c.

1. Tomato puree is used as a colouring agent to restore the

colour of the food.

2. Sugar // spice is used as a flavouring agent to enhance

the taste of food

3. Permitted modified starch is used as thickener to thicken

food.

(Any two)

Advantage :

i) to prevent food from spoilage

ii) to improve appearance, texture or taste

Disadvantage:

i) Lead to serious diseases like asthma, and cancer

- Part A is hydrophobic: Soluble in oil or grease

- Part B is hydrophilic: Insoluble in oil or grease//soluble in

water

1. Hard water contain Mg2+ and Ca2+ ion

2. Detergent does not form scum in hard water

3. Soap form scum in hard water

4. Mg P

2+P and CaP

2+P in hard water react with soap

5. Soap molecule consist of hydrophobic and hydrophilic

part

6. Hydrophobic part dissolve in oil

7. Hydrophilic part dissolve in water

8. During scrubbing/rinsing the oily stains/spots is

2+2

1

1

1 + 1

1 + 1

1

1

1

1

1

1

1

1


SULIT 9 4541/2/PP


washed away

9. Cloth in experiment II /detergent is cleaner than cloth in experiment I

10. Detergent in hard water is more effective than soap.

1

1

20

10.

a.(i)

(ii)

b)

c)

The speed at which reactant are converted into product in a

chemical reaction// change in selected quantity of reactant or

produrt per unit of time taken.

Total surface area / concentration of reactant / temperature

of reactant / use of catalyst / pressure of gaseous reactant

(any 4)

To make the coffee powder and sugar dissolve easier in water. The heat given to the water will give more kinetic energy to the particles. The particles of water, coffee powder and sugar move faster. They will collide each other more frequent. The frequency of effective collision will increase.

Precipitate : Sulphur Materials:

0.2 mol dm P

-3P sodium thiosulphate, 1.0 mol dmP

-3P sulphuric

acid, a piece of white paper marked ‘X’ at the centre. Apparatus: 150 cmP

3P conical flask, stopwatch, 50 cmP

3P measuring cylinder,

10 cmP

3P measuring cylinder, thermometer, Bunsen burner,

wire gauze. Procedure:

Using a measuring cylinder, 50 cmP

3 Pof 0.2 mol dmP

-3P sodium

thiosulphate solution is measured and poured into a conical flask. The conical flask is placed on top of a piece of white paper marked ‘X’ at the centre.

1

1+1

1

1

1

1

1

1

1

1

1

1


SULIT 10 4541/2/PP


END OF MARKING SCHEME

5 cmP

3P of 1.0 mol dm P

-3P sulphuric acid is measured using

another measuring cylinder. The sulphuric acid is poured immediately and carefully into the conical flask. At the same time, the stop watch is atarted The mixture in a conical flask is swirled. The ‘X’ mark is observed vertically from the top of the conical flask through the solution. The stopwatch is stopped once the ‘X’ mark disappears from view. Step 1 – 7 are repeated using 50 cmP

3P of 0.2 mol dm P

-3P sodium

thiosulphate solution at 40 P

oPC, 50P

oPC, 60P

oPC by heating the

solution before 5 cm P

3P of sulphuric acid is added in.

(Max 8) Conclusion

The increase of temperature, increase the rate of reaction

1

1

1

1

1

1

1

20


SULIT 4541/3/PP

@ 2012 Hak Cipta MPSM Pahang 1 [ Lihat halaman sebelah SULIT

4541/3/PP Peraturan Permarkahan Kimia Kertas 3 OKT/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.


SULIT 4541/3/PP


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


SULIT 4541/3/PP


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


SULIT 4541/3/PP


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



SULIT 4541/3/PP


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


SULIT 4541/3/PP


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, ⁰C 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:


SULIT 4541/3/PP


I II III

Initial temperature 27⁰C 29 27⁰C

Highest temperature 53.0 57.0 59.0

Increase in temperature 26⁰C 28 32⁰C

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


SULIT 4541/3/PP


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 4 Number of carbon atom


SULIT 4541/3/PP


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


SULIT 4541/3/PP


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 are soluble 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



SULIT 4541/3/PP


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 salts insoluble 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



SULIT 4541/3/PP


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


SULIT 4541/3/PP


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


SULIT 4541/3/PP




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


spm trial 2012 chemistry qa pahang

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