Skema Paper 2

7/31/2019 Skema Paper 2

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No. ofQuestion

Answer MarksSubtotal Total

2 (a) Determine the freezing point of water.

(b) Lowers the freezing point of ice // ice does not meltquickly.

(c) Heat energy released / lose to surrounding is balanced bythe heat released by the particles.

(d) liquid and solid.

(e) (i) Released / lose to the surroundings //decreases.

(ii) P and Q: the water particles moves slower.Q and R: some particles moves slower and someparticles stop moving.

(iii) 20 minutes

(iv) Liquid only: PLiquid and solid: QSolid only: R

Jumlah

1

1

1+1

1

1

11

1

111

12

No. ofQuestion


3 (a) P: OxygenQ: HydrogenR: AnodeS: Cathode

(b) 1:2

(c) Acid enables water to conduct electricity.(d) 20 cm3

(e) P: The splinter will burn continuously.Q: The splinter will extinguish.

Jumlah

1111

1

11

11

9

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No. ofQuestion


4 (a) A: Saturated solution

B: Dilute solutionC: Concentrated solution

(b) Colourless.

(c) (i)Activity Apparatus

Set I Set IIP Q R

S

(ii) Activity P: Size of solute.Activity Q: Volume of solventActivity R: Temperature of solventActivity S: Stirring // Rate of stirring

(iii) 1. Mass of sugar.2. Type of water // sugar.

Jumlah

1

11

1

111

1

1111

11

14

Section B

Question

No.

Explanation Mark Total of

mark

5(a) Able to describe the atom shown in figure 8 by statinganyfourof the following:

1. Nucleus is at the center of the atom2. nucleus/atom contains 1 proton and 1 neutron //

proton number of 1 // nucleon number of 2[r: element, 1 proton number]

3. Electron moves around the nucleus// electron islocated outside the nucleus.4. One shell is filled with electron // the atom contain

1 electron // there is 1 valence electron // electronconfiguration is 1.

4 4

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10. the particles/molecule/atoms are far away fromeach other

11. the particle arrangement is not orderly.[a; randomly move//randomly]

12. the (kinetic) energy increases.

[a: heat energy kinetic energy]TOTAL 20

Section C

Question

number

Rubric Maximum

score

6 (i) [Able to give statement of problem correctly]

Example:Does the increase of temperature of water will dissolve a lot of

salt?

3

[Able to give statement of problem less correctly]

Example:Does the high temperature of water increase the dissolve ofsALT?

2

[Able to give an idea about the statement of problem]

Example:

Does the temperature of water will affect / influence the dissolveof salt?

1

[No response / wrong response] 0

Question

number

Rubric Maximum

score

6 (ii) [Able to state hypothesis correctly]

Example:The mass of salt dissolve in water increases when the

temperature of water increases.

3

[Able to state hypothesis less correctly]

Example:The water temperature increases, the solubility increases.

2

[Able to state an idea of hypothesis less correctly] 1

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Example:The increases of temperature of water influence the solubility ofsugar.


Question

number

Rubric Maximum

score

6 (iii) [Able to state all variables correctly]

Example:Manipulated variable: Temperature of waterResponding variable: Mass of salt dissolve // solubility of saltConstant variable: Volume of water // type of salt

3

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

[Able to state any one of the variables above correctly] 1


Question

number

Rubric Maximum

score

6 (iv) [Able to give lists of substances and apparatus correctly andcompletely]

Example:Substances : Salt and waterApparatus : Beaker, Bunsen burner, measuring cylinder,

electronic balance, thermometer, glass rod, wiregauze and tripod stand.

3

[Able to give lists of substances and apparatus correctly but notcomplete]

Example:Substances : Salt // waterApparatus : Beaker, Bunsen burner, electronic balance,

thermometer and glass rod.

2

[Able to give lists of substances and apparatus]

Example:Substances : Salt // waterApparatus : Beaker, Bunsen burner and electronic balance /

thermometer / glass rod.

1


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Question

number

Rubric Maximum

score

6 (v) [Able to state all procedures correctly]

Example:1. 100 cm3 of water is measured and poured into a beaker.2. The temperature of water is recorded using thermometer.3. Another beaker is filled with salt then weighed and

recorded.

4. Add the salt from time to time into the water and stirredit.5. Continue the process until no more salt dissolved.6. The beaker and its salt content is weighed again and

recorded.7. The experiment is repeated by heating the water to

temperatures of 40oC, 50oC, 60oC and 70oC respectively.8. Record the data.

3

[Able to state all procedures but less correctly]

Example:

1. 100 cm3

of water is measured and poured into a beaker.2. Another beaker is filled with salt then weighed and recorded.3. Add the salt from time to time into the water and stirred it.4. Continue the process until no more salt dissolved.5. The beaker and its salt content is weighed again and

recorded.6. The experiment is repeated by heating the water to

temperatures of 40oC, 50oC, 60oC and 70oC respectively.7. Record the data.

2

[Able to state an idea about how to carry out the experiment]

Example:1. Put water into beaker.2. Put salt into another beaker.3. Add the salt from time to time into the water and stirred

it.4. The beaker and its salt content is weighed again and

recorded.5. Repeat the experiment.

1

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Question

number

Rubric Maximum

score6 (vi) [Able to exhibit the tabulation of data correctly]

Example:Temperature/oC Room

temp.40 50 60 70

Initial mass ofbeaker andsalt / gFinal mass ofbeaker and

salt / gMass of saltdissolved/g

3

[Able to exhibit the tabulation of data less accurately without

unit]

Example:Temperature Room

temp.40 50 60 70

Mass of salt

dissolved

2

[Able to state an idea about the tabulation of data]

Example:

1


END OF MARKING SCHEME

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Skema Paper 2

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