Spm Che3 Q&a (kedah)

  • Uploaded by: SimPor
  • 0
  • 0
  • November 2019
  • PDF

This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA


Overview

Download & View Spm Che3 Q&a (kedah) as PDF for free.

More details

  • Words: 1,382
  • Pages: 15
j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

j2k

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

MOZ@C j2k

PEPERIKSAAN PERCUBAAN SPM 2008 NEGERI KEDAH DARUL AMAN MARKING SCHEME CHEMISTRY PAPER 3 Section A

Question

1 (a)

Explanation

Maximum score

[Able to record all the five readings accurately]: Suggested answer: Pairs of electrodes

Voltage/V

Cu and P

1.5

Cu and Q

1.8

Cu and R

0.6

Cu and S

2.3

Cu and T

1.2

[Able to record any 4 readings accurately] [Able to record any 3 readings accurately] [No response given or wrong response] Question

1 (b)

Explanation [Able to arrange the position of all metals in descending order of electropositivity correctly]

3

2 1 0 Maximum score 3

Suggested answer: S, Q, P, Cu, R, T [Able to arrange the position of at least four metals in descending order of electroposivity correctly] [Able to arrange the position of at least two metals in descending order of electroposivity correctly] [No response given or wrong response]

SMS MUZAFFAR SYAH , MELAKA

2 1 0

MOZ@C j2k

Question

1 (c)

Explanation

Maximum score

[Able to state three variables and the way to control them correctly] Suggested answer: Substituting the electrode T with different metals

Manipulated variable: Pair of metals

Reading of the voltmeter// voltage

Responding variable: Voltmeter reading

6

Controlled variable: Electrolyte//copper(II) sulphate Use the same concentration of solution//concentration and electrolyte/CuSO4 //use the same voltmeter//use copper electrode in volume of electrolyte//same all experiments. voltmeter//copper electrode [Able to state any 5 of the above information correctly] [Able to state any 4 of the above information correctly ] [Able to state any 3 of the above information correctly] [Able to state any 2 of the above information correctly ] [Able to state any 1 of the above information correctly ] [No response given or wrong response] Question

1 (d)

Explanation

5 4 3 2 1 0 Maximum score

[Able to state the relationship between the manipulated variable and the responding variable and the direction correctly] Suggested answer:The further the distance of the pair of metals in the electrochemical series the higher is the voltage / the voltmeter reading

3

[Able to state the relationship between the manipulated variable and the responding variable in general] Suggested answer:

2

The position of the metal in the electrochemical series affects the reading of the voltmeter// the higher the position of the metal in the electrochemical series, the bigger/ higher is the voltage/ the voltmeter reading. [Able to state an idea of hypothesis] Suggested answer:

1

The electrochemical series is determined by the voltage value//Different metals give different voltage values. [No response given or wrong response]

SMS MUZAFFAR SYAH , MELAKA

0

MOZ@C j2k

Question 1(e)

Explanation

Maximum score

[Able to state three observations and three inferences correctly]

Observation

Inference

1. copper strip/rod/metal dissolves/ becomes thinner

Copper is oxidised/ loses electron to form copper(II) ion

2. Brown solid is deposited at metal T

Copper is formed

3. The intensity of blue coloured solution remains unchanged

The concentration of Cu2+ in the solution remain unchanged

[Able to state any five of the above information correctly] [Able to state any four of the above information correctly] [Able to state any three of the above information correctly] [Able to state any two of the above information correctly] [Able to state any one of the above information correctly] [No response given or wrong response] Question 1(f)

Explanation

6

5 4 3 2 1 0 Maximum score

[Able to predict the voltage of the three cells accurately] Suggested answer:

Pair of metals

Voltage/ V

P and S

0.8

P and T

2.7

Q and R

2.4

[Able to predict the voltage of any two cells accurately] [Able to predict the voltage of any one cell accurately] [No response given or wrong response]

SMS MUZAFFAR SYAH , MELAKA

3

2 1 0

MOZ@C j2k

Question 1(g)

Explanation

Maximum score

[Able to classify all the metals correctly] Suggested answer:

More electropositive P, Q, S

Less electropositive R, T

2

[Able to classify three metals correctly] [Able to classify two metals correctly]

1 0

[No response given or wrong response] Question 1(h)

3

Explanation

Maximum score

[Able to explain the difference in the voltage of the cell] Suggested answer:

3

The distance between Cu and metal S is further than the distance between Cu and metal P in Electrochemical Series. The distance between Cu and metal S is further than the distance between Cu and metal P.. S is more electropositive than P [No response given or wrong response]

Question 1(i)

Explanation

2 1 0

Maximum score

[Able to draw the labeled apparatus set-up completely] Suggested answer:

Copper

Metal T

Copper(II) sulphate solution

T nitrate solution

3

Salt bridge [Able to draw the labeled apparatus set-up incompletely] [Able to draw the apparatus completely without label] [No response given or wrong response]

SMS MUZAFFAR SYAH , MELAKA

2 1 0

MOZ@C j2k

Question 2(a)

Explanation

Maximum score

[Able to write the problem statement of the experiment accurately.] Sample answer: How do lithium, sodium and potassium differ in reactivity with water?

3

[Able to write the problem statement of the experiment correctly.] Sample answer: How do lithium, sodium and potassium differ in reactivity?

2

[Able to write a relevant idea about the problem statement of the experiment//Able to write aim of experiment accurately.] Sample answer: How do lithium, sodium and potassium differ?//To compare the reactivity of lithium, sodium and potassium when react with water.

1

[No response given or wrong response]

0

Question 2(b)

Explanation

Maximum score

[Able to state the hypothesis accurately] Suggested answers: The reactivity of lithium, sodium and potassium towards water increases down the group // The reactivity of lithium, sodium and potassium towards water increases down the group

3

// The reactivity of lithium, sodium and potassium towards water in increasing order is : Lithium, sodium and potassium

[Able to the hypothesis of the experiment] The reactivity of lithium, sodium and potassium are different.

2

// The reactivity of lithium, sodium and potassium towards oxygen/ halogen increases down the group

[Able to state that there is a reaction between lithium / sodium / potassium and water ]

1

[No response given or wrong response]

0

SMS MUZAFFAR SYAH , MELAKA

MOZ@C j2k

Question 2(c)

Explanation

Maximum score

[Able to state the three variables correctly.] Sample answer: Manipulated variable : Type of metal 3 Responding variables : Reactivity of metal Fixed variables : Size of metal, volume of water [Able to state any two variables correctly.] [Able to state only one variables correctly.] [No response given or wrong response]

Question 2(d)

Explanation

Maximum score

[Able to state complete materials and apparatus.] Sample answer: Materials: Lithium, sodium, potassium, water Apparatus: Basin/beaker, filter paper, pen knife/blade, forcep/tongs [Able to state any six materials and apparatus correctly.] [Able to state any three materials and apparatus correctly.] [No response given or wrong response]

Question 2(e)

2 1 0

Explanation

3

2 1 0 Maximum score

[Able to write the complete procedure of the experiment correctly] Suggested answer: 1. A small piece of lithium is cut using a knife and a pair of forceps 2. The surface of lithium is dried with filter paper 3. The piece of lithium is placed on the surface of water in a trough

3

4. The movement of lithium and any sound/flame given out is observed and recorded 5 Repeat the experiment using a small piece of sodium and potassium. [Able to write the necessary steps of the expeimental procedure] Steps 1, 3, 4 and 5

2

[Able to write the minimum experimental procedure] 1

Steps 3 and 5 [No response given or wrong response]

SMS MUZAFFAR SYAH , MELAKA

0

MOZ@C j2k

Question 2(f)

Explanation

Maximum score

[Able to construct a labeled tabulation of data ] Sample answer: Metal

Observation

3

Lithium Sodium Potassium [Able to construct a tabulation of data ] Sample answer: Metal

Observation

2

[Able to construct a table consisting of two rows and two columns.] 1

[No response given or wrong response]

END OF MARKING SCHEME

SMS MUZAFFAR SYAH , MELAKA

0

Related Documents

Spm Che3 Q&a (kedah)
November 2019 14
Spm Che3 (johor)
October 2019 23
Spm Che3 (swkmj)
November 2019 8
Spm Che3 (kelantan)
November 2019 15
Spm Che3 (sel)
November 2019 25
Spm Che3 Q&a (n9)
November 2019 19

More Documents from "SimPor"