kimia p3 f4 akhir 06

8/4/2019 Kimia p3 f4 Akhir 06

1/23


2/23

SULIT 4541/3

4541/3 SULIT

2

INFORMATION FOR CANDIDATES

1. This question paper consists ofthree questions. Answerall questions.

2. Write your answers forQuestion 1 andQuestion 2 in the spaces provided in the question

paper.

3. Write your answer forQuestion 3 on the lined pages at the end of the question paper in

detail.

4. Show your working. It may help you to get marks.

5. If you wish to cancel any answer, neatly cross out the answer.

6. The diagrams in the questions are not drawn to scale unless stated.

7. Marks allocated for each question or part question are shown in brackets.

8. The time suggested to answerQuestion 1 andQuestion 2 is 45 minutes andQuestion 3is 45 minutes.

9. You may use a non-programmable scientific calculator.

10. Hand in this question paper at the end of the examination.

Marks awarded:

Mark Description

3 Excellent : The best response

2 Satisfactory : An average response

1 Weak : An inaccurate response

0 No response or wrong response


3/23

SULIT 4541/3

[Lihat sebelah

4541/3 SULIT

3

Answerall questions

The time suggested to answer Question 1 andQuestion 2 is 45 minutes.

1 A student carried out an experiment to determine the empirical formula of zinc oxide.

The steps and set-up of apparatus of the experiment are shown in Figure 1.

1. The crucible and lid are weighed.

2. The crucible, lid and zinc powder are weighed.

3. The zinc powder is heated until it reacts completely with oxygen.

4. The crucible, lid and zinc oxide are weighed when cooled.

FIGURE 1

zinc powder

crucible

lid

digital balance

yellow fumes

zinc oxide

powder

heat

125.4372g

133.2380g

135.0680g


4/23

SULIT 4541/3

4541/3 SULIT

4

(a) Complete the following table by stating the observations and related inferences in

the experiment.

Observations Inferences

(i) ................................................

....................................................

(i) ................................................................

....................................................................

(ii) ...............................................

....................................................

(ii) ...............................................................

.....................................................................

(iii) )

....................................................

....................................................

(iii)

.................... ...............................................

....................................................................

[6 marks]

(b) Round off the reading to two decimal places and record it in the table below.

[3 marks]

Description Mass / g

The crucible and lid.

The crucible, lid and zinc powder.

The crucible, lid and zinc oxide.

1(a)

1(b)


5/23

SULIT 4541/3

[Lihat sebelah

4541/3 SULIT

5

(c) (i) Calculate the mass of zinc that has been used.

(ii) Calculate the mass of oxygen which reacted with zinc.

(iii) Determine the empirical formula of zinc oxide.Use the information that the relative atomic mass, O = 16, Zn = 65

[3 marks]

(d) The student wants to determine the empirical formula of copper(II) oxide. He

used the steps and set-up of apparatus as the experiment before.Predict whether the empirical formula of copper(II) oxide can be determined.

Explain your answer.

...................................................................................................................................

..................................................................................................................................

[3 marks]

1(c)

1(d)


6/23

SULIT 4541/3

4541/3 SULIT

6

(e) Below are some oxides of element.

Classify the oxides in into two groups, those which are basic oxides and those which

are acidic oxides.

Put your answer in a suitable table.

[3 marks]

magnesium oxide

sulphur dioxide

carbon dioxide copper(II) oxide

1(e)

Total


7/23

SULIT 4541/3

[Lihat sebelah

4541/3 SULIT

7

2

Figure 2 shows the set-up of apparatus for an experiment to compare the

reactivity of chlorine, Cl2, bromine, Br2 and iodine, I2 towards their reaction withiron.

Set-up of apparatus Observation on

the iron wool

Iron ignites brightly.

A brown solid is

formed.

Iron glows dimly and

slowly.

A brown solid is

formed.

Iron ignites rapidly

with a bright flame.

A brown solid is

formed.

FIGURE 2

All elements in Group 17 of The Periodic Table of the Elements show similar

chemical properties but the reactivity is different.

Bromine

gas, Br2

Iron wool

Heat

Iodine

gas, I2

Iron wool

Heat

Chlorine

gas, Cl2

Iron wool

Heat


8/23

SULIT 4541/3

4541/3 SULIT

8

(a) Complete the table below based on the experiment.

Name of variables Action to be taken

(i) Manipulated variable:

.............................................................

............................................................

............................................................

(i) The way to manipulate variable:

............................................................

............................................................

............................................................

(ii) Responding variable:

............................................................

............................................................

.............................................................

(ii) What to observe in the

responding variable:

.............................................................

.............................................................

(iii) Fixed variable:

.............................................................

.............................................................

............................................................

(iii) The way to maintain the fixed

variable:

.............................................................

............................................................

[6 marks]

(b) State one hypothesis for the experiment.

.....................................................................................................................................

.....................................................................................................................................

[3 marks]

(c) Based on the observation for the experiment, state the relationship between the

position of the halogens in The Periodic Table of the Elements and the reactivity ofthe reaction towards iron.

.....................................................................................................................................

.....................................................................................................................................

[3 marks]

2 a

2(c)

2(b)


9/23

SULIT 4541/3

[Lihat sebelah

4541/3 SULIT

9

(d) Arrange chlorine, bromine and iodine in descending order of reactivity of halogen

towards iron.

Descending order of reactivity of metal towards iron

[3 marks]

2(d)

Total


10/23

SULIT 4541/3

4541/3 SULIT

10

3

You are given the strips of magnesium, copper, zinc and lead. You are required to

construct the electrochemical series for these metals.

Based on the statements above, design a laboratory experiment to construct the

electrochemical series by measuring the potential difference of two metals.

Your explanation should include all the followings:

(a) Aim of the experiment.

(b) Variables.

(c) Statement of hypothesis.(d) List of materials and apparatus.

(e) Procedures of the experiment.

(f) Tabulation of data.

[17 marks]

END OF QUESTION PAPER

In a simple voltaic cell, when two different metals are dipped into an electrolyte,

the metal which is situated higher in the electrochemical series will donate

electrons and become the negative terminal.


11/23

SULIT 4541/3

[Lihat sebelah

4541/3 SULIT

11

SPACE FOR YOUR ANSWER

Section: Question No.: .

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..


12/23

SULIT 4541/3

4541/3 SULIT

12



..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..


13/23

SULIT 4541/3

[Lihat sebelah

4541/3 SULIT

13



..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..

..


14/23

1

BAHAGIAN SEKOLAH

KEMENTERIAN PELAJARANMALAYSIA

CHEMISTRY FORM 4

FINAL EXAM 2006

MARKING SCHEME

PAPER 3


15/23

2

MARKINGSCHEME PAPER 3

1 (a)

Score Rubric

3 [Able to state three inferences according to the observations correctly]Example:


i) Yellow fumes is released. Zinc oxide is produced // Zinc has

been oxidised.

ii) Bright burning. Zinc is a reactive metal.

iii) The mass increases. Zinc has combined with oxygen.

iv) The residue is yellow when hot

and white when cold.

Zinc oxide is produces // Zinc has

been oxidised.

2 [Able to state two inferences /two observations which is accurate or two

inaccurate inferences / two inaccurate observations ]

Example:


i) Fumes is released. Zinc compound is produced // Zinc

has been oxidised.

ii) Zinc burns. Zinc is a reactive metal.

iii) The mass increases. Zinc has combined with oxygen.

iv) The metal change colour. Zinc oxide is produces // Zinc hasbeen oxidised.

1 [Able to give ideas on the observations and inferences]

Example:


i) Gas is released. Zinc compound is produced // Zinc

has been oxidised.

ii) Burning. The reaction occur.

iii) The mass of zinc oxide increases. Zinc reacts when it is heated.

iv) The metal precipitate. Zinc oxide is produces.

0 No response or wrong response.


16/23

3

1 (b)

Score Rubric

3 [Able to record the data correctly]

Example:

Description Mass / g

The crucible and lid.

The crucible, lid and zinc powder.

The crucible, lid and zinc oxide.

125.44

133.24

135.07

2 [Able to record two data correctly // all reading are correct to three or four

decimal places]

1 [Able to record one data correctly]


1 (c)

Score Rubric

3 [Able to calculate the mass of zinc, mass of oxygen and show the steps to

determine the empirical formula of zinc oxide accurately]

Example:

i) Mass of zinc = 133.24 125.44 = 7.80 g

ii) Mass of oxygen = 135.07 133.24 = 1.83 giii)The empirical formula of zinc oxide:

Element Zn O

No. of moles 7.80

65

= 0.12

1.83

16

= 0.11

Simplest ratio 1 1

Empirical formula : ZnO

2 [Able to state the mass of zinc, mass of oxygen and show a part of steps to

determine the empirical formula of zinc oxide / state the empirical formulacorrectly]

Example:

i) Mass of zinc = 7.80 g

ii) Mass of oxygen = 1.83 g

iii)The empirical formula of zinc oxide : ZnO

1 [Able to state the mass of zinc / the mass of oxygen / the empirical formula of

zinc oxide correctly]



17/23

4

1 (d)

Score Rubric

3 [Able to predict and explain the answer correctly]

Example:

No.Copper is non-reactive metal.

2 [Able to predict but cannot explain the answer]

Example:

No.

Copper(II) oxide is non-reactive / copper is reactive metal.

1 [Able to give ideas on the prediction]

Example:

Yes.

Copper is a reactive metal / copper can reacts with oxygen / copper is non-

reactive metal.


1 (e)

Score Rubric

3 [Able to classify the metal oxides correctly]

- write the name or symbol of the metal oxidesExample:

Basic oxides Acidic oxide

Magnesium oxide / MgO

Copper (II) oxide/CuO

Sulphur dioxide/ SO2Carbon dioxide /CO2

2 [Able to classify the metal oxides with less accuracy]

Example:

Basic oxides Acidic oxide

Magnesium oxide / MgO /

Copper (II) oxide/CuO

Sulphur dioxide/ SO2 /

Carbon dioxide /CO2

1 [Able to give ideas on the classification with less accuracy]

Example:

Magnesium oxide / MgO Sulphur dioxide/ SO2Copper (II) oxide/CuO Carbon dioxide /CO2



18/23

5

2 (a)

Score Rubric

6 [Able to state all variables dan how to control the variables correctly]

Example:Manipulated variable:

Types of halogens

Use different types of halogens i.e

chlorine, bromine and iodine

Responding variable:

The reactivity of halogens

Observe the burning / glowing of iron

wool when it is heated

Fixed variable:

Iron

Use the same size /mass / type of iron

5 [Able to state any five items correctly]

4 [Able to state any four items correctly]

3 [Able to state any three items correctly]

2 [Able to state any two items correctly]

1 [Able to state any one item correctly]


2 (b)

Score Rubric3 [Able to relate the manipulated variable to the responding variable correctly]

Example:

The higher the position of a halogen, the more reactive it is when heated with

iron wool // The reactivity of halogens towards iron decreases when going down

the group.

2 [Able to relate the manipulated variables to the responding variables with less

accuracy]

Example:

The reactivity of halogens decreases when going down the group.

1 [Able to give ideas on the statement of hypothesis]

Example:

The reactivity depends on the type of halogen // The reactivity of halogens

towards iron is different.



19/23

6

2 (c)

Score Rubric

3 [Able to state the relationship between the position and reactivity of halogens

correctly]

Example:The higher the position of a halogen in the Periodic Table, the more reactive it is

in the reaction with iron // The reactivity of halogens towards iron decreases

when going down the group.

2 [Able to state the relationship between the position and reactivity of halogens

with less accuracy]

Example:

Chlorine is the most reactive, bromine is reactive and iodine is the least reactive.

1 [Able to give ideas on the relationship between the position of halogens with less

accuracy]

Example:

The reactivity of halogens towards iron are different.

Chlorine is the most reactive halogen.


2 (d)

Score Rubric

3 [Able to arrange halogen correctly]

Example:

Chlorine, bromine, iodine

2 [Able to arrange halogen with less accuracy]

Example:

Chlorine, iodine, bromine

1 [Able to give ideas on the reactivity]

Example:Iodine, bromine, chlorine



20/23


21/23

8

(c) Statement of hypothesis

Score Rubric

3 [Able to relate the manipulated variable to the responding variable correctly]

Example:

The further apart the metal in the electrochemical series, the greater is their

potential difference.

2 [Able to relate the manipulated variable to the responding variable with less

accuracy]

Example:

By using different pairs of metal, the electrochemical series can be constructed //

The potential difference between pairs of metal is shown by the distance of the

metals in the electrochemical series.

1 [Able to give ideas on the statement of hypothesis]

Example:

The potential difference can be used to determine the position of metals in the

electrochemical series//

Different pairs of metal show a different voltage readings.


(d) List of materials and apparatus

Score Rubric

3 [Able to list down the materials and apparatus completely]Example:

Apparatus:

Voltmeter / galvanometer, beaker, connecting wires

Materials:

Copper(II) sulphate solution(or any suitable electrolyte), copper strips, lead strip,

magnesium strip, zinc strip, sandpaper

2 [Able to list down part of the materials and apparatus]

Example:Voltmeter / galvanometer, copper(II) sulphate solution (or any suitable

electrolyte), copper strips / lead strip / magnesium strip / zinc strip

1 [Able to give ideas on the materials and apparatus]

Example:

Voltmeter / galvanometer, electrolyte, electrode



22/23

9

(e) Procedures of the experiment.

Score Rubric

3 [Able to state the procedures of the experiment accurately]

Example:

1. Clean the metals with sandpaper.2. Pour [50 100 cm

3] of copper(II) sulphate solution into a beaker.

3. Dip the magnesium and copper strips into copper(II) sulphate

solution.

4. Complete the circuit.

5. Record the potential difference / reading of the voltmeter.

6. Determine the metal strips which becomes the negative / positive terminal.

7. Repeat Steps 1 6 by replacing magnesium strip with other metals.

2 [Able to state the procedures of the experiment with less accuracy]

Example:

Write steps 3, 5, 7

1 [Able to give ideas on the procedures of the experiment]

Example:

Write steps 3, 5



23/23

(f) Tabulation of data.

Score Rubric

3 [Able to tabulate the data correctly which consists of the followings]

Pair of electrodes Potential difference (V) Negative / Positiveterminal

Mg Cu

Zn Cu

Pb Cu

- Name pair of electrodes

- Unit for potential difference

2 [Able to tabulate the data which consists of the followings]

Pair of electrodes Potential difference Negative / Positive

terminal

1 [Able to give ideas on the tabulation of data]


6 construct : 6 x 3 = 18 marks

Max : 17 marks

END OFMARKING SCHEME PAPER 3

kimia p3 f4 akhir 06

Documents