SKEMA JAWAPAN KERTAS 1 JUJ KIMIA SET 1 2017 1 A 11 D …...3) 2 + Na 2 CO 3 Pb CO 3 + 2NaNO 3 1 1 2...

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

4541 Set 1 © Hak Cipta JUJ Pahang 2017 1

SKEMA JAWAPAN KERTAS 1

JUJ KIMIA SET 1 – 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



MARKING SCHEME PAPER 2 SET 1 JUJ CHEMISTRY 2017

Question No. Mark Scheme Sub

Mark ΣMark

1 (a) Horizontal rows of elements in the Periodic Table of

elements

1 1

(b) Atoms have three shells filled with electron 1 1

(c) 2.8.5 1 1

(d) (i) 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

1

2

(ii) Aluminium / Al 1 1

(iii) Al2O3 1 1

(e)

pH value pH 2 pH 13

Oxide of element SO2 Na2O

1 + 1

2

TOTAL 9


Mark ΣMark

2 (a) (i) Oil // Fats 1 1

(ii) Ester 1 1

(iii) Saponification 1 1

(b) (i) A: Soap

B: Detergent

1

1

2

(ii) Magnesium ion/ Mg2+

// Calcium ion/ Ca2+

1 1

(c) (i) Ethene 1 1

(ii)

1 1

(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 1

TOTAL 9




Mark ΣMark

3 (a) (i) NO2 1 1

(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

(iii) molecule 1 1

(iv) 1. Correct formula of reactants and products

2. Balanced equation

N2 + 2O2 2NO2

1

1

2

(b) (i) Ionic bond 1 1

(ii) 1. Magnesium atom donates two electrons to

form Mg2+

2. Oxygen atom receive two electrons to form O2-

1

1

2

(iii) High melting/ boiling point //

Can conduct electricity in molten/ aqueous solution//

Soluble in water//Insoluble in organic solvent

1

1

TOTAL 10


Mark ΣMark

4 (a) Heat change when one mol of metal is displace from its

salt solution by a more electropositive metal.

1 1

(b) To reduce heat loss to the surrounding. 1 1

(c)

Temperature increase // Brown solid deposited// Blue

colour of CuSO4 become paler

1 1

(d)

(i) H = 100(4.2)(10) J // 4200 J // 4.2 kJ 1 1

(ii) 1. number of mole

2. Heat of displacement with correct unit and negative

sign

1

1+1

3




Mark ΣMark

n = // 0.05

H = - J mol-1 // 84000 Jmol-1 // 84 kJmol-1

(e) Exothermic reaction 1 1

(f)

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

1

1

2

TOTAL 10


Mark ΣMark

5 (a) (i) Double decomposition reaction 1 1

(ii) Lead(II) nitrate / Pb(NO3)2

Sodium carbonate / Na2CO3 // Potassium carbonate/

K2CO3// Ammonium carbonate/ (NH4)2CO3

1

1

2

(iii) 1. Correct formula of reactants and products


Pb(NO3)2 + Na2CO3 Pb CO3 + 2NaNO3

1

1

2

(iv) White 1 1

(b)

(i) Sodium carbonate / Na2CO3 // Potassium carbonate /

K2CO3 // Ammonium carbonate / (NH4)2CO3

1

1

(ii) Cu2+

+ CO32-

CuCO3 1 1

(iii) 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

3

TOTAL 11




Mark ΣMark

6 (a) (i) K+, Cl

-, H

+, OH

- 1 1

(ii) Bubble gas released // colourless gas released 1 1

(iii) R: Chlorine

T: Oxygen

1

1

2

(b) (i) Copper(II) sulphate / CuSO4 // Silver nitrate /AgNO3 //

Sodium chloride / NaCl //

[Any suitable electrolyte]

1

1

(ii) V, W, Z, Y, X 1 1

(iii) 1. V and X

2. 2.80 V

1

1

2

(iv) 1. Silver

2. Silver is located below copper in

electrochemical series// Silver is less

electropositive than copper

1

1

2

(c) Electrical energy to chemical energy 1 1

TOTAL 11


Mark ΣMark

7 (a) (i) 1. Solvent L : Propanon // methylbenzene // [any

suitable organic solvent]

2. Solvent M : Water

Beaker A Beaker B

3 No gas bubbles release

// No change

Gas bubbles release //

colourless gas X

collected in the syringe

4 HCl does not ionise // no

H+ ion // HCl exist as

molecule

HCl ionise // present of

H+ ion

5 No reaction Reaction occur

6 Blue litmus paper does

not change colour

Blue colour litmus paper

change to red

1

1

1

1

1

1

6

(ii) 3. Correct formula of reactants and products


5. Number of mole

6. Mole ratio

7. Molar mass of CaCO3

8. Mass with correct unit

1

1

1

1

1

1

6




Mark ΣMark

CaCO3 + 2HCl CaCl2 + H2O + CO2

Moles gas = // 0.001

1 moles gas X produced from 1 moles CaCO3 //

0.001 moles gas X produced from 0.001 moles CaCO3

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

Compare pH value of acid H2Y and acid HX.

H2Y is diprotic acid //

1 mole of H2Y ionise in

water produce 2 moles

of H+ ion

HX is monoprotic acid //

1 mole of HX ionise in

water produce 1 moles

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

1

1

1

1

1

1

(ii) 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




Mark ΣMark

8 (a) 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

1

1

1

1

1

6

(b) 1. Glucose undergoes oxidation

2. by losing hydrogen

3. Oxygen undergoes reduction

4. by gaining hydrogen

1

1

1

1

4

(c) 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


Fe2+

+ Zn Fe + Zn2+

8. Reaction III:

1. Correct formula of reactants and products


2 Fe2+

+ Br2 2 Fe3+

+ 2Br-

1

1

1

1

1

1

1

1

1

1

10

TOTAL 20


Mark ΣMark

9 (a) 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

1

1

1

1

1

1

6




Mark ΣMark

(b) (i) 1. Correct formula of reactants and products


3. Rate of reaction set II with correct unit.

4. Rate of reaction set III with correct unit.

Mg + 2HNO3 Mg(NO3)2 + H2

Rate of reaction set II = gs-1 // 0.003 gs-1

Rate of reaction set III = gs-1 // 0.005 gs-1

1

1

1

1

4

(ii) 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.

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

1

1

1

1

1

10

TOTAL 20




Mark ΣMark

10 (a) 1. Process I : Dehydration

2. Process II : Esterification

3. Homologous series compound P : Alcohol

4. Compound P : Hydroxyl group / -OH

5. Compound Q : Double covalent bond between carbon

atoms / C=C

6. Compound R : Carboxyl group / -COOH

1

1

1

1

1

1

6

(b) 1. Correct formula of reactants and products


3. Mole ratio

4. Mass with correct unit

C2H5OH C2H4 + H2O

1 moles C2H4 produced from 1 moles C2H5OH //

0.0005 moles C2H4 produced from 0.0005 moles C2H5OH

Mass C2H5OH = 0.0005 x 46 g // 0.023 g

1

1

1

1

4

(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



PERATURAN PEMARKAHAN KIMIA KERTAS 3 JUJ 2017 SET 1

Soalan Pemarkahan Markah

1(a)

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

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


1(b)

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

Time/min

3




1(c)

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

graph correctly

Sample answer:

Temperature/oC

80.0

Time/min

3


Able to give an idea to plot a graph

Sample answer:

1

No response or wrong response or empty table 0




1(c)

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

Sample answer:

Melting point of naphthalene: 80 oC //

Temperature, oC

Melting point

Time/min

2

1(c)

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

Melting point

Time/min

1





1(d)

Able to explain correctly according to 3 information :

- Heat 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:

The heat energy is used to overcome the forces of attraction

2

Able to state an idea

Sample answer:

The heat energy is used/absorbed//solid turn to liquid//the heat energy is

used to overcome the forces.

1





1(e)

Able to predict the temperature at the 8th

minutes with unit and decimal

place correctly

Answer:

101.0 0C

3


minutes without unit and

decimal place correctly

Sample answer:

101.0 // 101 0C //101

2


minutes less correctly

Sample answer:

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

1





1(f)

Able to classify all the compound correctly

Sample answer:

Ionic compound Covalent compound

Potassium bromide

Copper(II) sulphate

Aluminium oxide

Ammonia

Methanol

tetrachloromethane

3

Able to classify any 5 compounds correctly. 2

Able to classify at least 2 compound correctly 1



2 (a)

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//

Covalent compound

III Bulb lights up Can conduct electricity//

Ionic compound

6

Able to state at least 5 observations and inference correctly 5

Able to state at least 4 observation and inference correctly 4








2 (b)

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 : electrical conductivity//bulb lights up and

the bulb does not light up

(iii) Constant variable : mass of substance/compound//carbon

electrode

3

Able to state any two variables correctly 2

Able to state any one variable correctly 1



2 (c)

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


responding variable less correctly

Sample answer:

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

compound can conduct electricity/lights up the bulb

2

Able to give an idea of hypothesis

Sample answer:

Conduct electricity/bulb lights up

1





2 (d)

Able to give one operational definition of the experiment correctly with

the following aspects:

i) what you do-dip /immerse (carbon electrode )in electrolyte/PbBr2

ii) what you observe-bulb lights up

Sample answer:

1. when carbon electrode is dipped in electrolyte/lead(II) bomide /PbBr2

2. Bulb lights up

3

Able to give the operational definition for electrical conductivity for

ionic compound incompletely with any one of the following aspects:

i).what you do

ii).what you observe

Sample answer:

Bulbs lights up/dip carbon electrode in lead(II) bromide/electrolyte

2

Able to give an idea of operational definition for electrical conductivity

for ionic compound

Sample answer:

Carbon electrode is dipped / [electrolyte] is used /molten state

1





3 (a)

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

strong alkali different ? //To study the heat of neutralization between

strong and weak acid with strong alkali.

2

Able to state an idea about problem statement

Sample answer:

Heat of neutralisation is affected by the strength of acid.

1



3 (b)


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


responding variable without stating the direction/ less accurately

Sample answer:

Different strength of acid react with sodium hydroxide, different value

of heat of neutralisation

2

Able to give an idea of hypothesis

Sample answer:

The strength of acid affect the heat of neutralisation

1





3(d)

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

]

ethanoic acid (any suitable strong and weak named acid),

Apparatus : Polystyrene/plastic cup, thermometer, [50-100cm3]

measuring cylinder

3

Able to give the list of the apparatus and materials correctly but not

complete

Sample answer:

Sodium hydroxide solution, hydrochloric acid / ethanoic acid,

Polystyrene/plastic cup, thermometer,

2

Able to give an idea on the list of the apparatus and substances

correctly

Any one materials and any one apparatus

1



3(c)

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 : Concentration and volume of NaOH

solution//NaOH solution//polystyrene cup //

Concentration and volume of acid solution

3

Able to give any two variables accurately 2

Able to give any one variable accurately 1





3(e)

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.

6. The mixture is stirred using thermometer

7. The highest temperature is recorded.

8. Repeat steps 1 to 6 using ethanoic acid instead of hydrochloric acid.

3

Able to state 5 steps of the experiment

Steps 2, 4, 5, 8

2

Able to state 2 minimum steps correctly

Steps 5, 6/7

1



3(f)

Able to construct the table that contains the following information

1. Columns and rows 2. Headings in the table 3. With unit

Sample answer:

Pair of acid/alkali

Initial temperature/ oC Highest temperature

of the mixture/o C

Acid Alkali Average

NaOH/HCl

NaOH/CH3COOH

2




3(f)

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:

Pair of acid/alkali

Initial temperature Highest

temperature of the

mixture

Acid Alkali

//

Sample answer:

Pair of acid/alkali Temperature

1


PERATURAN PEMARKAHAN TAMAT

SKEMA JAWAPAN KERTAS 1 JUJ KIMIA SET 1 2017 1 A 11 D …...3) 2 + Na 2 CO 3 Pb CO 3 + 2NaNO 3 1 1 2...

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Transcript of SKEMA JAWAPAN KERTAS 1 JUJ KIMIA SET 1 2017 1 A 11 D …...3) 2 + Na 2 CO 3 Pb CO 3 + 2NaNO 3 1 1 2...