Skema PAT T4 2011

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Skema PAT 2011

Tingkatan 4

Paper 1

1 B 21 D 41 B2 C 22 D 42 B

3 A 23 B 43 C

4 D 24 B 44 C

5 C 25 D 45 C

6 A 26 A 46 B

7 C 27 B 47 C

8 D 28 C 48 C

9 D 29 C 49 B

10 B 30 D 50 B11 C 31 D

12 D 32 A

13 B 33 B

14 D 34 B

15 A 35 A

16 A 36 C

17 B 37 D

18 C 38 A

19 C 39 D

20 A 40 B

Marking scheme paper 2

No Answer Mark

1 (a) (i) Haber process 1

(ii) Hydrogen ; nitrogen 1

(iii)

(iv)

Iron / Ferum

4500C

1

1

(v) Pungent smell // dissolve in water // colourless gas // low melting

point // low boiling point

Choose any 2

2

(b) (i) Fused glass 1

(ii)

(iii)

Highly heat resistant // great purity // resistance to chemical //

resistance to thermal shock

Withstand high temperature // chemically inert // hard // brittle //

high melting point

1

2

Total 10

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No Answer Mark

2 (a)

(b)

(c)

(d)

(e)

(f)

(i)

(ii)

3

Chlorine / Cl2 // Argon / Ar

Semiconductors/ to make diodes / transistors

Aluminium

2. 8. 2

2. 8. 7

Magnesium atom donates two electron,

(Two) chlorine atom accept one electron

The number of proton increase / The charge of the nucleus

increase,

The attraction force between nucleus and (valence ) electron

increase

1

1

1

1

1

1

2

1

1

Total 10

3 (a) Chemical to electrical 1

(b) Cu2+

, H+, OH

-and SO4

2-1

(c) (i) Zinc 1

(ii) Zinc atom releases electrons//Zinc more electropositive // Zn

above in electrochemical series 1

(d) (i) Brown solid deposited 1

(ii) Cu2+

+ 2e Cu 1

(e) Blue to colourless// Blue become fade/ paler // The intensity of

blue colour decreases.

The number of copper(II) ions decreases //The concentration of

copper(II) ions decr

1

1

(f) (i) Cu, R, Q, P 1

(ii) 1.5 V 1

10

4 (a)(i) Copper(II) oxide 1 1

(ii) Neutralisation 1 1

(iii) Correct reactants and products

Balance the equation

1

1

2

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2HCl + CuO CuCl2 + H2O

(iv) To complete the reaction 1 1

(b)(i) Double Decomposition / Precipitation reaction 1 1

(ii) Ag+

+ Cl- AgCl 1 1

(iii) Filtration 1 1(c) Cation : Cu2+

Anion : Cl-

1

1 2

Total mark 10

5 (a) To remove the oxide layer

1

(b) (i) Mass of magnesium = 22.3020.50 g // 1.80 g

Mass of oxygen = 23.50 22.30 g // 1.20 g

1 + 1

(ii) Mg O

1 mol 1 mol 1

(iii) MgO 1

(c) 2Mg + O2 2MgO

Pt 1: correct reactants and productPt 2: balanced equation

11

(d) To let the oxygen in // to prevent loss of white fumes 1

Dry

hydrogen

Pt 1functional

Pt 2correct labeling

1 + 1

10

6 (a) ( i ) water( ii ) methylbenzene// any organic solvent

11

heat

Oxide of metal W // metal oxideOxide of metal W // metal oxide

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b

c

d

ions

1.X ionises in water to produce hydrogen ions,

2.Y has neutral molecules and cannot ionise

( i ) neutralization

( ii ) 2HCl + Ba( OH )2 BaCl2+ 2H2O

( iii ) 1.No. Of mole, HCl= 0.6 X 8.0 = 0.0048

----------

1000

2. No. Of mole Ba(OH)2 = 0.0048/2 = 0.0024

3. Concentration of Ba(OH )2 = 0.0024 X 1000

-------------- //

8

= 0.3

1

1

1

1

1

1

1

110

Marking Scheme Paper 3

1 (a) KK0503Measuring and using numbers

EXPLANATION SCORE

[Able to write both temperatures with correct to 1 decimal place]

temperature reading : 82.0 C

temperature reading : 97.0 C

3

[Able to record all the volumes accurately but without decimal place]

temperature reading : 82

temperature reading : 97

2

[Able to write at least one reading of the temperature accurately] 1

No response given / wrong response 0

1 (b) KK0506Communicating

EXPLANATION SCORE

[Able to draw a graph of temperature against time of the experiment on

the same axes with all the 4 items below correctly ]

(i) axes labelled correctly with units

(ii) suitable scale used

(iii) all points plotted correctly

(iv) smooth curve of graph and more than size of graph paper 3

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[Able to draw a graph of temperature against time of the experiment on

the same axes with all the 3 items correctly ]

2

[ Able to manipulate two items correctly ] 1No response or wrong response 0

1 (c)KK0505Predicting

EXPLANATION SCORE

[Able to state the temperature correctly and able to show the how the melting

point is determined on the graph]

Answer: 82 .0

3

[Able to state the temperature but without unit and did not label melting point

on the graph correctly]

Answer: 82

2

[Able to state the temperature but without unit and did not show the melting

point on the graph]

Answer: 82

1


1 (d) KK0508Interpreting Data

EXPLANATION SCORE

[Able to interpret the data accurately]

Suggested answer:

The heat energy absorbed is used to overcome the forces of attraction/bonds

between the molecules of acetamide

3

[Able to give correct interpretation but less accurate]

Suggested answer:

The heat energy is used to overcome the forces of attraction ofmolecules /

particles of acetamide

2

[Able to give an idea] 1

82oC

meltingpoint

Melting point

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Suggested answer:

The heat energy is used / absorbed.


1 (e) KK0505Classifying

EXPLANATION SCORE

[Able to classify the ionic and covalent compounds correctly]

Ionic Covalent

Magnesium chloride

Copper(II) nitrate

Zinc sulphate

Methylbenzene

Tetrachloromethane

Carbon dioxide

3

[Able to state at least two pairs correctly // correct grouping but wrong

heading or vice versa ]

2

[Able to state one pair correctly in a correct grouping] 1


2(a) KK0510 - State the variables

EXPLANATION SCORE

[Able to state the three variables and action to be taken correctly]

Name of variables Action to be taken(i) Manipulated variable:

Type of group 1 metals

used

(i) The way to manipulate

variable:

Use lithium, sodium and

potassium metal for each

experiment.

(ii) Responding variable:

Rate of reaction//Reactivity of

the reaction

(ii) What to observe in

the responding variable:

The movement of metal on

the water surface.

(iii) Fixed variable:

Quantity/size of metal used.

(iii) The way to maintain

the fixed variable:

Use the same quantity/size

of metal.

6

[Able to state any five items correctly] 5

[Able to state any four items correctly] 4

[Able to state any three items correctly] 3

[Able to state any two items correctly] 2

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[Able to state any one item correctly] 1


2 (b) KK0512Stating hypothesis

EXPLANATION SCORE

[Able to state the relationship between manipulated variable and

responding variable correctly]

Suggested answer:

The metal which is below in Group 1 is more reactive in the reaction with

water//The lower the metal in Group 1 the more reactive is the reaction

with water.

3


responding variable but in the opposite direction]

Suggested answer:The more reactive the reaction, the lower the position of the metal in Group 1

2

[Able to state an idea of the hypothesis]

Suggested answer:

Metals in Group 1 can react with water

1


2(c) KK 0508Interpreting Data

EXPLANATION SCORE

[Able to arrange the metals in descending order based on their reactivity]

Suggested answer:K, Na, Li

3

[Able to arrange the metals in ascending order based on their reactivity]

Answer:

Li, Na, K,

2

[Able to arrange the position of at least two metals in descending/ascending]

Suggested answer:

Na, Li, K// Li, K, Na// Na, K, Li

1


2(d) KK0507- Making relationship

EXPLANATION SCORE

[Able to state the relationship accurately]

Suggested answer:

The lower the position of the metal in Group 1, the higher the reactivity of the

metal.

3

[Able to state the relationship correctly but less accurate]

Suggested answer:

The reactivity of the metals is inversely proportional to their position in the

group.

2

[Able to state an idea of a relationship] 1

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Suggested answer:

Position of metals affect the reactivity


c2(e) KK 0508

Predicting

EXPLANATION SCORE

[Able to predict the reactivity of rubidium correctly]

Suggested answer:

The reaction of Rubidium is most reactive among lithium, sodium and

potassium when react with water

3

[Able to predict the arrangement of the metals based on their reactivity]

Suggested answer:

The reaction of Rubidium is most reactive.

2

[Able to give an idea

Suggested answer:

Rubidium is a reactive metal

1


3.(a) KK051021Statement of the problem

EXPLANATION SCORE

[Able to make a correct statement of problem]

Suggested answer:

Does the distance between two/ pair of metals in the electrochemical series

give different voltage values?

3

[Able to make a statement of the problem or suitable aim]

Suggested answer:

Does the distance between two /pair of metals give different voltage values?//

Distance between two/pair of metals in the electrochemical series gives

different voltage values.

2

[Able to state an idea of statement of problem or aim]

Metals influence the voltage values

1


3 (b) KK051202Stating variables

EXPLANATION SCORE

[Able to state all the three variables correctly]

Suggested answer:

Manipulated variable : types of pairs of metals

Responding variable: voltage values//potential difference

Constant variable : electrolyte used such as copper(II) sulphate solution.

3

[Able to state any two of the variables correctly] 2

[Able to state one of the variables correctly or state idea regarding

variable]

1


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3(c) KK051202Stating hypothesis

EXPLANATION SCORE


responding variable correctly]

Suggested answer:The further the distance/position between two metals in the electrochemical

series, the bigger the voltage value.

[If the responding variable comes first, the score is 2]

3


responding variable]

Suggested answer:

The further the distance /position between two metals, the bigger the

voltage value//vice versa

2

[Able to state an idea of the hypothesis]

Suggested answer:

Metals influence the voltage value

1


3(d) KK051205List of materials and apparatus

EXPLANATION SCORE

[Able to state the list of materialss and apparatus correctly and completely]

Suggested answer:

Beaker, connecting wires, crocodile clips, voltmeter, sand paper, [magnesium

ribbon, zinc strip,lead strip, copper strip], [copper(II) sulphate solution]

3

[Able to state the list of substances and apparatus correctly but notcompletely]

Suggested answer:

Beaker, connecting wires, voltmeter, [magnesium ribbon, zinc,

copper],[copper(II) sulphate solution]

2

[Able to state an idea about the list of substances and apparatus]

Suggested answer:

Beaker, metals, voltmeter, electrolyte, wire.

1


3(e) KK051204Procedure

EXPLANATION SCORE

[Able to state a complete experimental procedure]

Suggested answer:

1. [30 -200] cm3 of copper(II) sulphate solution is poured into a beaker.2. Magnesium ribbon and copper strip are cleaned with the sand paper.3. Magnesium and copper are dipped into the copper(II) sulphate solution.4. Both metals are connected to a voltmeter.5. The voltmeter reading is recorded.6. The circuit is completed.7. Steps 1 to 6 are repeated by using different of metals to pair with

copper.

3

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[Able to state the procedure which include the following steps]

Answer: Steps 1,3,4,5,6

2

[Able to state an idea of procedure]

Answer: Steps 3,5

1


3(f) Tabulation of data

EXPLANATION SCORE

[Able to exhibit the tabulation of data correctly ]

Pairs of metals Voltage/V Negative terminal

3

[Able to exhibit the tabulation of data less accurately ]

Pairs of metals Voltage

2

[Able state an idea about the tabulation of data]

Metals Voltage

1


Skema PAT T4 2011

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