Chem-JUJ-K1-K2-K3-Skema-Jawapan-SET-1-

SKEMA PRAKTIS BESTARI JUJ KIMIA SET 1 KERTAS KERTAS 1, 2 & 3

SKEMA JAWAPAN KERTAS 1 JUJ KIMIA SET 1 – 2017 2017

1

A

11

D

21

C

31

D

41

A

2

D

12

A

22

B

32

B

42

A

3

B

13

C

23

B

33

B

43

D

4

B

14

A

24

B

34

C

44

D

5

C

15

A

25

C

35

B

45

A

6

D

16

C

26

A

36

B

46

D

7

A

17

C

27

B

37

A

47

B

8

D

18

A

28

B

38

B

48

B

9

C

19

C

29

D

39

A

49

C

10

A

20

C

30

B

40

B

50

B

4541 Set 1 © Hak Cipta JUJ Pahang 2017

1

SKEMA PRAKTIS BESTARI JUJ KIMIA SET 1 KERTAS KERTAS 1, 2 & 3

MARKING SCHEME PAPER 2 SET 1 JUJ CHEMISTRY 2017

Question No. 1 (a)

Mark Scheme Horizontal rows of elements in the Periodic Table of elements

Sub Mark 1

ΣMark

1

(b)

Atoms have three shells filled with electron

1

1

(c)

2.8.5

1

1

1. Atom has achieved stable octet electron arrangement // atom has eight valence electron 2. Atom does not receive, donate or share electron with other atom

1

(d)

(i)

1

2

(ii)

Aluminium / Al

1

1

(iii)

Al2O3

1

1

1+1

2

(e) pH value

pH 2

pH 13

Oxide of element

SO2

Na2O TOTAL

Question No. 2 (a)

(b)

Sub Mark 1

Mark Scheme

ΣMark

(i)

Oil // Fats

(ii)

Ester

1

1

(iii)

Saponification

1

1

A: Soap B: Detergent Magnesium ion/ Mg + // Calcium ion/ Ca

1 1 1

2 1

1

1

1

1

1

1

TOTAL

9

(i) (ii)

(c)

9

+

(i) (ii)

Ethene

(iii)

- It is non biodegradable// - Produce poisonous/toxic gas when burn// - Improper disposal, clog the drain// - Improper disposal, place for mosquito breeding. [Any one]


1

2

SKEMA PRAKTIS BESTARI JUJ KIMIA SET 1 KERTAS 1, 2 & 3

Question No. 3 (a)

ΣMark

NO2

(ii)

1. Correct number of atoms and nucleus is shown. 2. Correct number of electron in each shell and correct number of electron shared.

1 1

2

molecule 1. Correct formula of reactants and products 2. Balanced equation

1 1 1

1 2

N2 + 2O2  2NO2 Ionic bond

1

1

1. Magnesium atom donates two electrons to form Mg2+ 2. Oxygen atom receive two electrons to form O 2-

1 1

2

1

1

TOTAL

10

(i) (ii)

(iii)

4 (a)

Mark Scheme Heat change when one mol of metal is displace from its salt solution by a more electropositive metal. To reduce heat loss to the surrounding.

(b) (c) (i) (ii)

1

High melting/ boiling point // Can conduct electricity in molten/ aqueous solution// Soluble in water//Insoluble in organic solvent

Question No.

(d)

Sub Mark 1

(i)

(iii) (iv)

(b)

Mark Scheme

Sub Mark 1

ΣMark

1

1

1

Temperature increase // Brown solid deposited// Blue colour of CuSO 4 become paler H = 100(4.2)(10) J // 4200 J // 4.2 kJ

1

1

1

1

1. number of mole 2. Heat of displacement with correct unit and negative sign

1 1+1

3


3


Question No.

Mark Scheme

(e) (f)

= -

J mol-1 // 84000 Jmol -1

Double decomposition reaction

(ii)

Lead(II) nitrate / Pb(NO3)2 Sodium carbonate / Na 2CO3 // Potassium carbonate/ K 2CO3// Ammonium carbonate/ (NH 4)2CO3 1. Correct formula of reactants and products 2. Balanced equation

(iv) (b)

Mark Scheme

(i)

(iii)

(i) (ii) (iii)

1

1

// 84 kJmol-1

Exothermic reaction 1. Magnesium // [Any metal higher place than copper in the electrochemical series] 2. Located higher than copper in the electrochemical series // More electropositive than copper

Question No. 5 (a)

ΣMark

// 0.05

n=

H

Sub Mark

1 1 TOTAL Sub Mark 1

2 10

ΣMark

1

1 1 1 1

2

1

1

Sodium carbonate / Na2CO3 // Potassium carbonate / K 2CO3 // Ammonium carbonate / (NH4)2CO3

1

1

Cu + + CO3 -  CuCO3 1. Pour the treated waste water into a test tube. 2. Add sodium hyroxide solution into the test tube. 3. Blue precipitate does not formed. OR 1. Pour the treated waste water into a test tube. 2. Add ammonia aqueous into the test tube. 3. No change.

1 1

1

Pb(NO3)2 + Na2CO3 White




2

Pb CO3 + 2NaNO3

1 1

3

TOTAL

11

4


Question No. 6 (a)

(i) (ii) (iii)

(b)

(i)

(ii) (iii) (iv)

(c)

Mark Scheme K +, Cl-, H+, OHBubble gas released // colourless gas released R: Chlorine T: Oxygen Copper(II) sulphate / CuSO4 // Silver nitrate /AgNO3 // Sodium chloride / NaCl // [Any suitable electrolyte] V, W, Z, Y, X 1. V and X 2. 2.80 V 1. Silver 2. Silver is located below copper in electrochemical series// Silver is less electropositive than copper Electrical energy to chemical energy

Question No. 7 (a)

(i)

Mark Scheme 1. Solvent L : Propanon // methylbenzene // [any suitable organic solvent] 2. Solvent M : Water Beaker A 3 No gas bubbles release // No change

Beaker B Gas bubbles release // colourless gas X collected in the syringe HCl ionise // present of H+ ion

4 HCl does not ionise // no H+ ion // HCl exist as molecule 5 No reaction Reaction occur 6 Blue litmus paper does Blue colour litmus paper not change colour change to red (ii)

3. 4. 5. 6. 7. 8.

Correct formula of reactants and products Balanced equation Number of mole Mole ratio Molar mass of CaCO3 Mass with correct unit


Sub Mark 1

ΣMark

1

1 1 1

2

1

1

1 1 1 1

1

1 1

2 1

TOTAL

11

Sub Mark 1

1

2

ΣMark

1

1

1 1 1

6

1 1 1 1 1 1

6 5


Question No.

Sub Mark

Mark Scheme CaCO3 + 2HCl

Moles gas =



CaCl2

+

H2O

+

ΣMark

CO2

// 0.001

1 moles gas X produced from 1 moles CaCO 3 // 0.001 moles gas X produced from 0.001 moles CaCO 3 Molar mass CaCO3 = 40 + 12 + 3(16) // 100 Mass CaCO3 = 0.001 x 100 g // 0.1g (b)

(i)

1. HX : HCl // HNO3 2. H2Y: H2SO4 3. HZ : CH3COOH

1 1 1

Compare pH value of acid H 2Y and acid HX. H2Y is diprotic acid // HX is monoprotic acid // 1 mole of H2Y ionise in 1 mole of HX ionise in water produce 2 moles water produce 1 moles of H+ ion of H+ ion 4. Concentration of H+ ion in H2Y is higher than in HX 5. The higher the concentration of H+ ion the lower the pH value (ii)

1

1 1

Compare pH value of acid HZ and acid HX. HZ is a weak acid // HZ ionise partially in water produce lower concentration of H+ ion

HX is a strong acid // HX ionise completely in water produce higher concentration of H+ ion

The lower the concentration of H+ ion the higher the pH value


1

1

8

TOTAL

20

6


Question No. 8 (a)

(b)

(c)

Mark Scheme 1. Fe: +3 2. Mg: +2 3. Fe2O3: Iron(III) oxide 4. MgO : Magnesium oxide 5. Iron has roman numeral because it has more than one oxidation number 6.Magnesium has no roman numeral because it has only one oxidation number 1. Glucose undergoes oxidation 2. by losing hydrogen 3. Oxygen undergoes reduction 4. by gaining hydrogen 1. Reaction I : +3  +2 2. Reaction II: +2  0 3. Reaction III: +2  +3 4. Metal X: Magnesium//Zinc//Aluminium 5. Substance Y: Magnesium//Zinc//Aluminium 6. Substance Z: Bromine 7. Reaction II: 1. Correct formula of reactants and products 2. Balanced equation Fe2+ + Zn  Fe + Zn2+ 8. Reaction III: 1. Correct formula of reactants and products 2. Balanced equation 2 Fe2+ + Br 2  2 Fe3+ + 2Br -

Question No. 9 (a)

Mark Scheme 1. Temperature 2. Time taken for clothes to dry in situation II is shorter compare to situation I // Clothes in situation II dry faster than in situation I. 3. Temperature in situation II is higher than situation I 4. Kinetic energy of particles in situation II is higher than situation I 5. The rate of water particles evaporate in situation II is higher than situation I 6. The higher the temperature the higher the rate of reaction


Sub Mark 1 1 1 1

ΣMark

1 1 1 1 1 1 1 1 1 1 1 1

6

4

1 1

1 1

10

TOTAL

20

Sub Mark

ΣMark

1 1

1 1 1 1

6

7


Question No. (b)

(i)

Mark Scheme 1. 2. 3. 4.

Correct formula of reactants and products Balanced equation Rate of reaction set II with correct unit. Rate of reaction set III with correct unit.

Mg + 2HNO3



Mg(NO3)2 +

Rate of reaction set II =

Rate of reaction set III = (ii)

gs-1 //

gs-1 //

Sub Mark 1 1 1 1

ΣMark

4

H2 0.003 gs-1

0.005 gs-1

Time taken for magnesium dissolved in set II is shorter than set I 1. Concentration of nitric acid in set II is higher than set I 2. Number of particles / H + ion perunit volume is higher 3. Frequency of collision between Mg and H + ion is higher 4. Frequency of effective collision is higher 5. Rate of reaction in set II is higher.

1 1 1 1 1

Time taken for Magnesium dissolved in set III is shorter than set II 6. Temperature in set III is higher than set II 7. The kinetic energy of particles is higher 8. Frequency of collision between Mg and H + ion is higher 9. Frequency of effective collision is higher 10. Rate of reaction in set III is higher.


1 1 1 1 1

10

TOTAL

20

8


Question No. 10 (a)

(b)

Mark Scheme 1. 2. 3. 4. 5. 6. 1. 2. 3. 4.

Process I : Dehydration Process II : Esterification Homologous series compound P : Alcohol Compound P : Hydroxyl group / -OH Compound Q : Double covalent bond between carbon atoms / C=C Compound R : Carboxyl group / -COOH Correct formula of reactants and products Balanced equation Mole ratio Mass with correct unit C2H5OH



C2H4

+

Sub Mark 1 1 1 1 1 1 1 1 1 1

ΣMark

6

4

H2O

1 moles C2H4 produced from 1 moles C 2H5OH // 0.0005 moles C 2H4 produced from 0.0005 moles C 2H5OH Mass C2H5OH = 0.0005 x 46 g // 0.023 g (c)

1. Compound P : Ethanol 2. Compound R : Butanoic acid 3. Measure 2 cm3 of glacial ethanoic acid and pour into a boiling tube 4. Add 2 cm3 of absolute ethanol into the boiling tube 5. Add few drops of concentrated sulphuric acid and shake 6. Heat the mixture 7. Pour the mixture into a beaker of water 8. Pineapple smell // sweet fruity smell 9. C2H5OH + C3H7COOH  C3H7COO C2H5 + H2O 10.

1 1 1 1 1 1 1 1 1

1

10

TOTAL

20

END OF MARKING SCHEME PAPER 2 4541 Set 1 © Hak Cipta JUJ Pahang 2017

9


PERATURAN PEMARKAHAN KIMIA KERTAS 3 JUJ 2017 SET 1 Soalan

Pemarkahan

Markah

Able to record all reading accurately to one decimal point and with

unit. Sample answer:

Initial temperature

: 60.0 oC

Temperature at 1 min : 67.0 oC

3

o

Temperature at 2 min : 73.0 C Temperature at 3 min : 80.0 oC 1(a)

Temperature at 4 min : 80.0 oC Temperature at 5 min : 80.0 oC Temperature at 6 min : 87.0 oC Temperature at 7 min : 95.0 oC Able to record all readings correctly without decimal point// Able to record 5-6 readings correctly

2

Able to record 3-4 readings correctly

1

No response or wrong response

0

Soalan

Pemarkahan

Markah

Able to plot a graph that contains the following information. Axes labeled with units All the 8 points transferred correctly A smooth curve is drawn Uniform scale Sample answer:

-

Temperature/oC

1(b) 3 Time/min 4541 Set 1 © Hak Cipta JUJ Pahang 2017

10


Soalan

Pemarkahan

Markah

Able to give an idea to plot a graph

Sample answer:

1

No response or wrong response or empty table

Soalan

0

Pemarkahan

Markah

Able to state the melting point with 1 decimal place and show on the graph correctly

Sample answer:

Temperature/oC

80.0

3

1(c) Time/min


11


Soalan

Pemarkahan

Markah

Able to state the melting point correctly without decimal place but with correct unit without showing on the graph//Able to state the melting point on the curve 1(c)

Sample answer:

Melting point of naphthalene: 80 oC // Temperature, oC 2 Melting point

Time/min

Able to state the melting point less accurately without unit and without decimal place // Able to show the melting point incorrectly ;

Sample answer:

Melting point of naphthalene : 80 //

Temperature/oC

1(c)

1 Melting point

Time/min



0

12


Soalan

Pemarkahan

Markah

Able to explain correctly according to 3 information :

-

H eat energy absorbed is used to over come the forces of attraction between the molecules

Sample answer:

Heat energy absorbed is used to overcome the forces of attraction between the molecules

3

Able to explain less accurately

Sample answer:

2

1(d) The heat energy is used to overcome the forces of attraction

Able to state an idea

Sample answer:

1 The heat energy is used/absorbed//solid turn to liquid//the heat energy is used to overcome the forces.



0

13


Soalan

Pemarkahan

Markah

Able to predict the temperature at the 8t minutes with unit and decimal place correctly

Answer:

3 0

101.0 C Able to predict the temperature at the 8t minutes without unit and decimal place correctly

Sample answer:

1(e)

2

101.0 // 101 0C //101

Able to predict the temperature at the 8t minutes less correctly

Sample answer:

1

Lebih dari 94. 0C // [102 ≤ X ≤ 105] // [95 ≤ X ≤ 100]



0

14


Soalan

Pemarkahan

Markah

Able to classify all the compound correctly Sample answer:

1(f)

Ionic compound

Covalent compound

Potassium bromide

Ammonia

Copper(II) sulphate

Methanol

Aluminium oxide

tetrachloromethane

3

Able to classify any 5 compounds correctly.

2

Able to classify at least 2 compound correctly

1


0

Soalan

Pemarkahan

Markah

Able to state all observations and inferences correctly. Sample answer:

Experiment

Observation

Inference

I

Bulb does not lights up

Cannot conduct electricity// Covalent compound

II

Bulb does not lights up

Cannot conduct electricity//

6

Covalent compound 2 (a)

III

Bulb lights up

Can conduct electricity// Ionic compound

Able to state at least 5 observations and inference correctly

5

Able to state at least 4 observation and inference correctly

4


3


2


1


0


15


Soalan

Pemarkahan

Markah

Able to state all the variables in this experiment correctly. Sample answer:

(i) Manipulated variables : Type/different substance/ionic compound and covalent compound (ii) Responding variable 2 (b)

: electrical conductivity//bulb lights up and

3

the bulb does not light up (iii) Constant variable

: mass of substance/compound//carbon electrode

Able to state any two variables correctly

2

Able to state any one variable correctly

1


0

Soalan

Pemarkahan

Markah

Able to state the relationship between the manipulated variable and the responding variable correctly Sample answer:

Covalent compound cannot conduct electricity/lights up the bulb and ionic compound can conduct electricity/lights up the bulb

3

Able to state the relationship between the manipulated variable and the responding variable less correctly Sample answer:

2 (c)

2

Covalent compound cannot conduct electricity/lights up the bulb // ionic compound can conduct electricity/lights up the bulb Able to give an idea of hypothesis Sample answer:

1

Conduct electricity/bulb lights up No response or wrong response


0

16


Soalan

Pemarkahan

Markah

Able to give one operational definition of the experiment correctly with the following aspects: i) what you do-dip /immerse (carbon electrode )in electrolyte/PbBr 2 ii) what you observe-bulb lights up

3

Sample answer: 1.

2.

when carbon electrode is dipped in electrolyte/lead(II) bomide /PbBr 2 Bulb lights up

Able to give the operational definition for electrical conductivity for ionic compound incompletely with any one of the following aspects: i).what you do 2 (d)

ii).what you observe

2

Sample answer:

Bulbs lights up/dip carbon electrode in lead(II) bromide/electrolyte Able to give an idea of operational definition for electrical conductivity for ionic compound Sample answer:

1

Carbon electrode is dipped / [electrolyte] is used /molten state No response or wrong response


0

17


Soalan

Pemarkahan

Markah

Able to state the problem statement with the named of strong acid and weak acid correctly Sample answer:

Does the heat of neutralisation between hydrochloric acid/(any strong acid) and sodium hydroxide solution is higher than the heat of neutralisation between ethanoic acid(any suitable weak acid) and sodium hydroxide solution?

3

Able to state the problem statement less correctly Sample answer:

Does the heat of neutralization between strong acid and weak acid with

2

strong alkali different ? //To study the heat of neutralization between 3 (a)

strong and weak acid with strong alkali. Able to state an idea about problem statement Sample answer:

1

Heat of neutralisation is affected by the strength of acid. No response or wrong response

Soalan

Pemarkahan

0

Markah

Able to state the relationship between the manipulated variable and the responding variable and state the direction correctly. Sample answer:

The reaction between hydrochloric acid/strong acid and sodium hydroxide will give the higher value of heat of neutralization than the reaction between ethanoic acid/weak acid with sodium hydroxide.

3

Able to state the relationship between the manipulated variable and the responding variable without stating the direction/ less accurately Sample answer:

2

Different strength of acid react with sodium hydroxide, different value of heat of neutralisation 3 (b)

Able to give an idea of hypothesis

1

Sample answer:

The strength of acid affect the heat of neutralisation No response or wrong response


0

18


Soalan

Pemarkahan

Markah

Able to state all the variables accurately Sample answer:

Manipulated variable : Hydrochloric Acid and Ethanoic Acid (any suitable named strong and weak acid) //Strong acid and weak acid //X and Y acid Responding variable : Heat of neutralisation Fixed variable

3(c)

3

: Concentration and volume of NaOH solution//NaOH solution//polystyrene cup // Concentration and volume of acid solution

Able to give any two variables accurately

2

Able to give any one variable accurately

1


0

Soalan

Pemarkahan

Markah

Able to list down the materials and apparatus correctly Sample answer:

Materials : [0.5-2.0mol dm-3] sodium hydroxide solution, [0.5-2.0mol dm -3 ] hydrochloric acid, [0.5-2.0 mol dm -3]

3

ethanoic acid (any suitable strong and weak named acid), Apparatus : Polystyrene/plastic cup, thermometer, [50-100cm 3] measuring cylinder Able to give the list of the apparatus and materials correctly but not complete 3(d)

Sample answer:

Sodium hydroxide solution, hydrochloric acid / ethanoic acid, Polystyrene/plastic cup, thermometer, Able to give an idea on the list of the apparatus and substances correctly

2

1

Any one materials and any one apparatus No response or wrong response


0

19


Soalan

Pemarkahan

Markah

Able to state all the steps of the experiment accurately Answer:

1. [25-100 cm3] of sodium hydroxide solution is poured into a polystyrene cup using a measuring cylinder. 2. The initial temperature of sodium hydroxide solution is recorded. 3. [25-100cm3] of hydrochloric acid is measured into another polystyrene cup. 4. The initial temperature of hydrochloric acid is recorded. 5. Hydrochloric acid is then poured quickly into a cup containing sodium hydroxide solution.

3

6. The mixture is stirred using thermometer 3(e)

7. The highest temperature is recorded. 8. Repeat steps 1 to 6 using ethanoic acid instead of hydrochloric acid.

Able to state 5 steps of the experiment Steps 2, 4, 5, 8

2

Able to state 2 minimum steps correctly

1

Steps 5, 6/7 No response or wrong response

Soalan

0

Pemarkahan

Markah

Able to construct the table that contains the following information 1. Columns and rows 2. Headings in the table 3. With unit Sample answer:

Initial temperature/ oC Pair of acid/alkali Acid 3(f)

NaOH/HCl

Alkali

Highest temperature of the mixture/o C

Average 2

NaOH/CH3COOH


20


Soalan

Pemarkahan

Markah

Able to construct the table that contains the following information 1. Columns and rows 2. Headings in the table 3. Without unit // Able to state an idea about the tabulation of data Tabulation of data has the following elements: Minimum 2 columns and 2 rows Sample answer:

Initial temperature Pair of acid/alkali Acid

Highest temperature of the mixture

1

Alkali

3(f) // Sample answer:

Pair of acid/alkali

Temperature


0

PERATURAN PEMARKAHAN TAMAT


21

Chem-JUJ-K1-K2-K3-Skema-Jawapan-SET-1-

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