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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
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
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1
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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.
Download With Free 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
Read Free Foron 30this Days Sign up to vote title
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Useful
Homologous series
name
1
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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.
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Sample answer :
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
No response or wrong response
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.
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1 0
Score
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
No response or wrong response
0
Unlock full access with a free trial.
Download With Free Trial
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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Ripples Advisory Daily Commodity
1
of 18
Antimicrobial Effects of Silver
cgpp2004 14summary
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SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
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Chem-JUJ-K1-K2-K3-SkemaJawapan-SET-2-
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Ripples Advisory Daily Commodity
1
of 18
Antimicrobial Effects of Silver
cgpp2004 14summary
Search document
SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
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3(b)
0
detergent
3
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Ripples Advisory Daily Commodity
1
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Antimicrobial Effects of Silver
cgpp2004 14summary
Search document
SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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:
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3
2
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Chem-JUJ-K1-K2-K3-SkemaJawapan-SET-2-
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Ripples Advisory Daily Commodity
1
of 18
Antimicrobial Effects of Silver
cgpp2004 14summary
Search document
SKEMA PRAKTIS BESTAR KIMIA SET 2 KERTAS 1, 2
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
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