Chem-JUJ-K1-K2-K3-Skema-Jawapan-SET-2-

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Ripples Advisory Daily Commodity

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Antimicrobial Effects of Silver

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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2

SKEMA JAWAPAN KERTAS 1 JUJ KIMIA SET 2 - 2017

1

D

11

C

21

A

31

D

41

C

2

C

12

B

22

D

32

C

42

A

3

C

13

B

23

C

33

A

43

B

4

C

14

B

24

D

34

A

44

B

5

A

15

C

25

A

35

A

45

A

6

B

16

C

26

C

36

B

46

D

7

B

17

C

27

C

37

A

47

A

8

C

18

A

28

B

38

D

48

B

9

C

19

D

29

D

39

B

49

B

10

B

20

B

30

B

40

C

50

C

Master your semester with Scribd & The New York Times Special offer for students: Only $4.99/month.

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MARKING SCHEME PAPER 2 SET 2 JUJ CHEMISTRY 2017

Sub Mark

Question No

Mark Scheme

1 (a)

smallest neutral particles

(b)

(i) (ii) (iii)

electron

(iv)

1. One similarity 2. one different Sample answer : 1. Same number of proton /proton number // same number of electron 2. Different number of neutron / nucleon number 70 / 70oC

(i) (ii) (iii)

1

1. Heat energy absorbed 2. is used to overcome the forces of attraction between particles Correct arrangement (at least 3x3 with same size & do not overlapping each other) You're Reading a Preview Unlock full access with a free trial.

Download With Free Trial

Question No 2 (a)

(i)

Mark Scheme

Total mark

Sub Mar 1

The chemical formula that shows the simplest ratio of atoms of each  element in the compound Read Free Foron 30this Days Sign up to vote title  (ii) C2H4O 1 Not useful  Useful  Cancel anytime. 1. value of n 1 Special offer (b) for students: Only $4.99/month. 2. Molecular formula 1

Master your semester with Scribd & The New York Times

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Question No

3 (a)

(b)

(c)

(i) (ii) (iii) (i) (ii) (i) (ii)

Mark scheme

Chlorine/Cl Aluminium Argon atom has achieved stable octet electron arrangement Cl The forces of attraction between nucleus and electron in Cl atoms is stronger than Na atom. Ionic bond

Cl

1.Correct number of ion and nucleus is labelled 2.Correct electron arrangement and charged

1 1

1. Soluble in water// 2. High melting and boiling point// 3. Conduct electricity in aqueous and molten state

1+1



Any two You're Reading a Preview Unlock full access with a free trial.

Question No

4 (a)

(i) (ii) (iii) (iv) (i)

1

-

+ Na

(iii)

Sub mark 1 1 1 1 1

Total mark

Mark scheme Download With Free Trial

Silicon dioxide / silica stabiliser /emulsifier Flavouring agent//thickening agent//colouring agent Analgesic // paracetamol (b) N2+3H2  2NH3 1. Correct formula of reactants and products Read Free Foron 30this Days Sign up to vote title 2. Balanced equation  Useful  Not useful Cancel anytime. (ii) 1. Type of fertilizer Special offer for students: Only $4.99/month. 2. % of N in urea


Sub mark 1 1 1 1 1

1

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Question No 5 (a)

(i)

(b)

(i)

(ii)

(c)

(iii) (i)

Sub Mark

Mark Scheme Increase of hydrogen gas per unit time // decrease of mass of zinc per unit time 1. draw the triangle 2. calculation

1

43.5-29 cm 3 // 14.5 cm3 // 0.242 cm3 s-1 120-60 s 60 s 41-26 cm s // 15 cm s- // 0.25 cm s120-60 60 Because the concentration of acid decrease with time Volume of gas / cm

1

1

1 1

Set II 1 Set I

Time / s (ii) (d)

(i) (ii)

You're Reading a Preview 1. size of zinc is smaller 1 2. remain the volume and concentration of hydrochloric acid. 1 Unlock full access with a free trial. Put 5 g/a packet of fine sugar in hot water and cold water in two 1 cups. Sugar in hot water dissolve faster. Download With Free Trial 1. temperature higher in hot water 1 2. water particles has higher kinetic energy 1 Total Mark

Question No

Mark Scheme

Master your Scribd 6(a) semester (i) Na , NOwith H , OH (accept name of ions) Read Free Foron 30this Days Sign up to vote title (ii) 1. hydrogen ions & The New York Times  Useful  Not useful (iii) 1. put glowing wooden splinter into a test tube +

Special offer for students: Only $4.99/month.

3 ,

+

-

2. The wooden splinter lights up

Cancel anytime.

Sub Mark  1  1 1 1

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Question No (b)

(i)

1. Anode : Zn  Zn + + 2e 2. Cathode : Cu 2+ + 2e  Cu

(iii)

1. Change copper electrode to silver electrode // change zinc electrode to magnesium electrode// any suitaible pair of electrodes 2. Reason : Distance between Ag and Zinc / Mg and Cu in electrochemical series is further Total Marks

Question No 7 (a)

Sub Mark 1 1

Mark Scheme

(i)

1

1

Sub Mark

Mark Scheme 1. structural formula 2. name

1+1 You're Reading a Preview

1+1

Butan -2-ol Unlock full access with a free2-methylpropan-2-ol trial.


*

Master your semester with Scribd *Any two isomer (ii) Times 1. Reaction I = esterification & The New York Special offer for students: Only $4.99/month.

Functional

2-methylpropan-1-ol


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Useful

Homologous series

name

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1

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Question No (b)

Sub Mark

Mark Scheme 1. Correct formula of reactants and product 2. balanced C3H8 + 5O2

1 1

3CO2 + 4H2O

3 & 4. Calculation

% of carbon

Propene 3(12) x 100 42 = 85.71%

Propane 3(12) x 100 44 = 81.81%

5. % of carbon atom by mass in propene is higher than propane. 6. Propene produces more soot than propane

1+1

1 1

Total Mark Question No

Mark scheme

8 (a)

1. V = sodium carbonate You're Reading a Preview 2. W= copper(II) sulphate 3. X = nitric acid Unlock full access with a free trial. 4. Y = copper(II) oxide 5. Z= Carbon dioxide Download With Free Trial 6. Double decomposition reaction // precipitation reaction Correct formula of reactants 2+ 7 & 8. Reaction I : Na2CO3 + CuSO4  CuCO3 + Na2SO4 9& 10. Reaction II : CuCO 3 + HNO3  Cu(NO3)2 + CO2 +H2O (b) Compare and contrast : Similarities :  Read Free Foron 30this Days Sign up to vote title 1. Both experiment produce black residue  Useful  Not useful 2. Both experiment released gas when heated Cancel anytime. Differences: Special offer for students: Only $4.99/month. 3. Exp I produced colourless gas and Exp II produced brown gas


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Question No

(c)

Mark scheme

1.Egg shells contain calcium carbonate 2. Calcium carbonate can react with acid 3. Calcium carbonate can dissolved in acid 4. Egg shell becomes soft//easier to insert in the bottle Total

Question No 9 (a)

Mark scheme

Types of reaction Energy profile diagram

Total energy content (b) (i)

Elephant Toothpaste Exothermic

Cold Pack Endothermic

You're Reading a Preview -Correct level and label -Correct level and label energy Unlock full access with a free trial. energy -correct equation & H -correct equation & H Total energy content ofFree the Trial Total energy content of Download With reactants is higher than the products is higher products than reactants

1. State solution A, 2. solution B 3. precipitate D (can infer from procedure) 4-9. procedure Read Free Foron 30this Days Sign up to vote title 10. data  Useful  Not useful 11-12. calculation Cancel anytime.


Sample answer :

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Question No

Mark scheme

7. pour sodium chloride solution quickly into the silver nitrate solution 8.stir the mixture 9. record the highest temperature reached 10. Initial temperature of sodium chloride solution = T1oC Initial temperature of silver nitrate solution = T2 oC Average Initial temperature = (T1+ T2)/2 = Ta oC Highest temperature = Tb oC 11. heat given out = mc  = 200 x 4.2 x (Tb – Ta) 1000 = w kJ 12. number of mol = 50 x 1 /1000 = 0.05 13. Heat of precipitation = - w/0.05 = -X kJmol -1 Total Question

Answer You're Reading a Preview

10 (a)(i)

full access with a free trial. 1. suitable metal R :Unlock Zn/Mg

Types of reaction Half equation

Zn/Mg Download With Free Trial CuSO 4 2. oxidation 3. reduction 4. Zn  Zn

+

+ 2e

5. Cu + + 2e  Cu

Master your semester with Scribd 6. Name the ion present in the colourless solution = copper(II) ions Read Free Foron 30this Days Sign up to vote title  (a)(ii) & The New York Times Useful  Not useful  Zn/Mg CuSO Special offer for students: Only $4.99/month. Change in

oxidation

Cancel anytime. 4

1.

0  +2

2.

+2  0

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Question

Answer

6. Leave the test tubes aside for a few days. 7. Observation Pair of metal Zn/Al and iron nail Iron nail

Observation pink spot form Blue spot form

Half equation for oxidation of metals 8. Test tube I : Zn  Zn2+ + 2e 9. Test Tube II : Fe  Fe2+ + 2e 10. Conclusion When a more electropositive metal is in contact with iron, the metal inhibits rusting // iron does not rust when in contact with a more electropositive metal Total marks

END OFYou're MARKING SCHEME PAPER 2 Reading a Preview Unlock full access with a free trial.




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PERATURAN PEMARKAHAN KIMIA KERTAS 3 JUJ SET 2 2017 Question

Rubric Able to state the colour change correctly

Scor

Answer: Pink colour change to colourless

Able to state the colour change less correctly 1(a) Sample answer: Purple to colourless

Able to state an idea of colour Sample Answer: Pink // Colourless// Purple

No response or wrong response

Question

Rubric Able to record all burette readings accurately to 2 decimal You're Reading a Preview places Unlock full access with a free trial.

Answer:

1(b)

Titration I II III

Scor

Download With Free Trial Initial reading (cm3) Final reading (cm3) 0.00 26.00 0.50 24.50 5.50 30.50

Able to record all the burette readings correctly to 1 decimal

Master your semester with Scribd places or able to record at least 4 reading Read correctly //For uniform Free 30this Days Sign up to vote on title decimal places & The New York Times  Useful  Not useful Cancel anytime.

Special offer for students: Only $4.99/month. Able to record at least 2 burette reading correctly without

decimal places

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Question

Rubric Able to consruct a table that contains the following information.

Score

1. Hading in the table : Set, Initil reading/cm3, Final reading/cm3, Volume of acid/cm3 2. Transfer all the burette readings from 1(b) correctly

3. With unit at the heading Sample answer:

1(c)

3

Titration

Initil reading/cm 3 Bacaan awal/cm

Final reading/cm3 Bacaan 3 akhir/cm 26.00

Volume of acid/cm3 3 Isipadu asid/cm

I

0.00

II

0.50

24.50

24.00

III

5.50

30.50

25.00

26.00

Able to construct a table less correctly 2 Able to construct a table thatReading containsa Preview the following information You're Unlock full: access with heading a free trial. 1. Headings in the table suitable

1 heading without 2. 2 column with Download data/ With Free Trial 2 column only Sample answer: Initial reading

Master your semester with Scribd response or wrong response & The New York NoTimes Special offer for students: Only $4.99/month.

Final reading


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Question

Rubric Able to calculate the average volume and concentration of hydrochloric acid with unit correctly Answer: Average volume of hydrochloric acid = 26.00 + 24.00 + 25.00 ---------------------------- = 25.00 cm3 3

Score

--- p1 3

1(d) Concentration of hydrochloric acid MHCl VHCl = 1 M NaOH V NaOH 1 MHCl X 25.00 = 1 1.0 X 50.00 1

---- p2

// 25.00 MHCl = 50.00 MHCl = 50.00 25.00 = 2.0 mol dm-3 ---- p3 You're Reading a Preview Unlock full volume access withand a free trial. Able to calculate the average concentration of hydrochloric acid correctly without unit Able to calculate volume of acid With OR concentration of acid Download Free Trial correctly No response or wrong response

Rubric Able to classify all the acids into strong and weak acid correctly Read Free Foron 30this Days Sign up to vote title Strong acids Weak acids Useful   Not useful Cancel anytime. Asid lemah Special offer for students: Only $4.99/month. Asid kuat

2 1 0

Question


Score  

3

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Question

2(a)

Rubric Able to state all inferences correctly

Score

Test tube Inference

A B C Iron nail Iron nail Iron nail 2+ does not rust // Fe does not 2+ rust //Fe Present / rust // Fe2+ does not formed does not present present Able to state 3 inferences correctly Able to state 2 inferences correctly

3

D Iron nail rust // Fe2+ Present / formed

2 1


Question

0

Rubric Able to state the relationship between manipulated varible and responding variable with direction correctly

Score

2(b) 3

Sample answer: When a more/less electropositive metal / higher/lower than iron in Electrochemical series is in contact with iron, iron (nail) does not rust/rust You'reless Reading a Preview Able to state the hypothesis correctly Sample answer: Unlock full access with a free trial. The rusting of iron is faster / slower, if a less / more Download Free Trial electropositive metal is in contactWith with iron/Fe

2

Able to give an idea of hypothesis Sample answer: Iron rust when in contact with other metal // other metal affect the rusting of iron.

Master your semester Scribd No responsewith or wrong response & The New York Times Special offer for students: Only $4.99/month.

Question

Rubric


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Question

Rubric Able to give one operational definition of the experiment correctly with the following aspects:

Score

3

i) what you do ii) what you observe

2(d)

Sample answer: 1. when iron nail is coiled/in contact with a less electropositive metal (copper)/metal located below iron in electrochemical series 2. Rusting of iron is the formation of blue spot/colouration Able to state at least two criteria correctly Sample answer: Rusting of iron is the formation of blue spot /colouration or when iron nail is coiled/in contact with a less electropositive metal

2

Able to state an idea of operational definition Sample answer: You're Reading a Preview Blue spot/rusting occur

1


0

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Question

Rubric Able to predict the observation correctly

Score

Answer: The intensity of blue spot/colouration is very high//higher than test tube B. Read Free Foron 30this Days Sign up to vote title Able to predict the observation  Useful  Not useful Cancel anytime. Sample answer: Special offer for students: Only $4.99/month. The intensity of blue spot/colouration is high

3

2(e)


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Question

Rubric Able to state the relationship correctly between the time taken and the amount of rust form correctly 1. Time taken 2. Formation of rust 3. Comparison

Score

3 Sample answer:

2(f)

The longer the time taken, the bigger/greater/larger the rust form //the longger the time taken, more rust is form //the rust form is greater/bigger/larger when the time taken is longer //the rust form in one week is more/bigger/greater/larger than one day Able to state the relationship between the time taken and the amount of rust form less correctly 1. Time taken/Formation of rust 2 Sample answer:

The rust form is bigger/greater/larger You're Reading a Preview //the form is directly proportional to the time taken Unlock full access with a free trial.

Able to state any idea of relationship Download With Free Trial Sample answer: 1 The rust is form/change//rust is small/less No response or wrong response


0 Read Free Foron 30this Days Sign up to vote title

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Question

Rubric Able to give the problem statement correctly

Score

Sample answer:

3 How does the effectiveness of cleansing action of two different types of cleansing agent in hard water? // What is the difference in effectiveness of cleansing action in hard water using soap and detergent? Able to give the problem statement less correctly Sample answer:

3(a) How does different type of cleansing agent affect the effectiveness of cleansing action in hard water?

2

// To investigate the effectiveness of different type of cleansing agent in hard water. Able to give an idea of statement of the problem Sample answer:

You're Reading a Preview

1

Unlock full access with a free trial.

To study the effectiveness of cleansing action in hard water Download With Free Trial No response or wrong response

Question

Rubric Able to state all variables correctly

Master your semester with Scribd Sample answer: & The New York Times

Score


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Useful

Special offer for students: Only Manipulated $4.99/month. variable :Types of cleansing agent//soap and

3(b)

0

detergent

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Question

Rubric Able to state the relationship between the manipulated variable and the responding variable correctly

Score

Sample answer: Detergent is more effective than soap in hard water. // Detergent in hard water can remove the oily stains on cloth while soap cannot.

3

Able to state the relationship between the manipulated variable and the responding variable incorrectly

3(c)

Question

Sample answer: Detergent is more effective // Soap is less effective // Detergent in hard water can remove the oily stains on cloth //soap cannot remove stain on cloth. Able to state an idea of hypothesis No response or wrong response

2

1 0

Rubric a Preview You're Reading Able to give the completely list of the apparatus and materials Unlock full access with a free trial. Answer: Apparatus: Beakers, measuring cylinder, glass rod Download With Free Trial Material: Soap, detergent, [cleansing agent X dan cleansing agent Y], 0.5 - 1 mol dm- 3 magnesium sulphate solution/[sea water/hard water], 2 pieces of cloth with oily stains.

3(d) semester Able to givewith the list of the apparatus and materials correctly but Master your Scribd Read Free Foron 30this Days Sign up to vote title not completely & The New York Times  Useful  Not useful Special offer for students: Only Answer: $4.99/month.

Apparatus:

Cancel anytime.

Score

3

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Question

Rubric Able to state all procedures correctly

Score

Sample answer :

3(e)

1. Label 2 beakers as A and B respectively 2. Fill all the beakers with [50 - 100 cm 3 ]of hard water / magnesium sulphate solution 3. Add cleansing agent X/detergent in beaker A and cleansing agent Y/soap in bikar B. 4. Place a piece of cloth with oily stain into each beaker 5. Stir the solution in each beaker using glass rod until no change can be observed 6. Wash the oily stain on each piece of cloth using the solution in each beaker 7. Record the observation.

3

Able to state three steps of procedures correctly Steps 2, 3, 5, 6, Able to state two steps of procedures correctly Steps 2, 3, 6 No response or wrong response

2 1 0

You're Reading a Preview

Question

Unlock fullRubric access with a free trial.

Score

Able to exhibit the tabulation of data that includes the following Download With Free Trial information. 1. Headings Sample answer : 3(f)

Beaker A B

2 Observation

Master your semester with Scribd & The New York Able Times to tabulate the data incompletely Special offer for students: Only $4.99/month.

1. Titles without unit


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