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SULIT 1 4541/3

4541/3Nama : ... Kelas : ...Kimia

Kertas 3

Nov

2006

1 Jam

SEKTOR SEKOLAH BERASRAMA PENUH

KEMENTERIAN PELAJARAN MALAYSIA_______________________________________________

PEPERIKSAAN AKHIR TAHUN TINGKATAN 4

2006

KIMIA

KERTAS 3

Satu jam Tiga Puluh Minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

1. Tuliskan nama dan tingkatan padaUntuk Kegunaan Pemeriksaruang yang disediakan.

Soalan Markah Markah2. Calon dikehendaki membaca maklumatPenuh Diperolehdi halaman 2.

1 18

2 15

3 17

JUMLAH 50

Kertas soalan ini mengandungi 13 halaman bercetak

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4541/3 SULIT

SULIT 2 4541/3

INFORMATION FOR CANDIDATES

1. This question paper consists of three questions. Answer all questions.

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

paper.

3. Write your answer for Question 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 answer Question 1 andQuestion 2 is 45 minutes andQuestion 3

is 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

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SULIT 3 4541/3

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.

lid

crucible

digital balance125.4372g

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

zinc powder

133.2380g

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

yellow fumes

heat

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

zinc oxide

powder

135.0680g

FIGURE 1

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SULIT 4 4541/3

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

the experiment.

Observations Inferences

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

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

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

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

(iii) ) (iii)

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

1(a).................................................... ....................................................................

[6 marks]

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

Description Mass / g

The crucible and lid.

The crucible, lid and zinc powder.

The crucible, lid and zinc oxide. 1(b)

[3 marks]

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SULIT 5 4541/3

(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

1(c)

[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.

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

1(d)..................................................................................................................................

[3 marks]

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SULIT 6 4541/3

(e) Below are some oxides of element.

magnesium oxide

sulphur dioxide

carbon dioxide

copper(II) oxide

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.

1(e)

[3 marks]

Total

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SULIT 7 4541/3

2All elements in Group 17 of The Periodic Table of the Elements show similar

chemical properties but the reactivity is different.

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

reactivity of chlorine, Cl , bromine, Br and iodine, I towards their reaction with2 2 2iron.

Set-up of apparatus Observation on

the iron wool

Iron wool

Bromine Iron ignites brightly.gas, Br A brown solid is2

formed.

Heat

Iron wool

IodineIron glows dimly and

gas, Islowly.

2

A brown solid isformed.

Heat

Ir on wool

ChlorineIron ignites rapidly

gas, Cl2 with a bright flame.

A brown solid is

formed.

Heat

FIGURE 2

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SULIT 8 4541/3

(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:

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

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

2(a)

[6 marks]

(b) State one hypothesis for the experiment.

.....................................................................................................................................2(b)

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

[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 of

the reaction towards iron.

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

2(c)

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

[3 marks]

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

towards iron.

2(d)

Descending order of reactivity of metal towards iron

[3 marks]

Total

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3

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.

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 appar atus.

(e) Procedures of the experiment.

(f) Tabulation of data.

[17 marks]

END OF QUESTION PAPER

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SPACE FOR YOUR ANSWER

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BAHAGIAN SEKOLAH

KEMENTERIAN PELAJARAN MALAYSIA

CHEMISTRY FORM 4

FINAL EXAM 2006MARKING SCHEME

PAPER 3

1


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1 (b)

Score Rubric

3 [Able to record the data correctly]

Example:

Description Mass / g

The crucible and lid. 125.44

The crucible, lid and zinc powder. 133.24

The crucible, lid and zinc oxide. 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 g

iii)The empirical formula of zinc oxide:

Element Zn O

No. of moles 7.80 1.83

65 16

= 0.12 = 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 gii) 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]


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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 oxides

Example:Basic oxides Acidic oxide

Magnesium oxide / MgO Sulphur dioxide/ SO2Copper (II) oxide/CuO Carbon dioxide /CO 2

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

Example:

Basic oxides Acidic oxide

Magnesium oxide / MgO / Sulphur dioxide/ SO /2Copper (II) oxide/CuO Carbon dioxide /CO2

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

Example:

Magnesium oxide / MgO Sulphur dioxide/ SO 2Copper (II) oxide/CuO Carbon dioxide /CO

2


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2 (a)

Score Rubric

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

Example:

Manipulated variable: Use different types of halogens i.e

Types of halogens chlorine, bromine and iodine

Responding variable: Observe the burning / glowing of iron

The reactivity of halogens wool when it is heated

Fixed variable: Use the same size /mass / type of iron

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 Rubric

3 [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.


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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 mor e reactive it isin 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 lessaccuracy]

Example:

The reactivity of halogens towards iron are different.

Chlorine is the most reactive halogen.


2 (d)

Score Rubric3 [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


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3 (a) Aim of the experiment

Score Rubric

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

Example:

To construct the electrochemical series based on the potential difference betweenpairs of metal.

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

Example:

To construct the electrochemical series based on the potential difference //

Can the electrochemical series be constructed based on the potential differencebetween pairs of metal?

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

Example:

To construct the electrochemical series.


(b) Variables

Score Rubric

3 [Able to state all variables correctly]Example:

Manipulated variables: Pairs of metal / type of metal

Responding variables: Potential difference / voltage readings

Fixed variables: Copper electrode / copper(II) sulphate solution

2 [Able to state any two variables correctly]

1 [Able to state any variables correctly]


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(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 theelectrochemical 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 suitableelectrolyte), copper strips / lead strip / magnesium strip / zinc strip

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

Example:

Voltmeter / galvanometer, electrolyte, electrode


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(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


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(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 / Positive

terminal

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 OF MARKING SCHEME PAPER 3

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