07_jpnt_scn_f4_modul4.pdf

Modul 4 Bimbingan EMaS Chapter 5 ;Energy and Chemical Changes

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MODUL KECEMERLANGAN AKADEMIKTERENGGANU TERBILANG 2007

PROGRAM PRAPEPERIKSAAN SPMndah Science Form 4erhanaggi

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SCIENCEFORM 4

MODULE 4


OBJECTIVE QUESTIONSInstructions: Each questions is followed by four choices of answers. Choose the best

answer for each question.

1 Which of the following is true about a physical change?A It involves a change in the arrangement of particlesB It is an irreversible changeC It produces a new substanceD It needs a lot of energy

2 Which of the following are examples of chemical changes?I Burning of magnesium in airII Condensation of steamIII Heating of calcium carbonateA I and II onlyB I and III onlyC II and III onlyD I, II and III

3 Which of the following is true about the difference between chemical and physicalchanges?

Chemical change Physical changeA Irreversible ReversibleB No new substance is

formedNew substance is formed

C Little energy is required Plenty of energy is requiredD Non-permanent change Permanent change

4 The following are examples of exothermic reactions exceptA neutralization of an acid by an alkaliB respiration in the body cellsC the combustion of fuelsD photosynthesis

5 The above equation shows a part of a reaction that occurs in the Haber process.Which of the following statements are true concerning this reaction?I The reaction is exothermicII The optimum temperature is 450oC 500oCIII The suitable pressure is 200atmIV Iron catalyst increases the reaction rateA I onlyB I and II only

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C I, II and III onlyD I, II, III and IV


6 When solid potassium chloride dissolves in water, the temperature of the mixturefalls. What conclusion can you derive from this information?A The reaction is exothermicB The reaction is endothermicC All solids dissolve with fall in temperatureD Very little potassium chloride is soluble in water

7 Which of the following liquids is used to store potassium?A OilB WaterC VinegarD Ethanol

8 Which of the following metals will displace zinc from zinc sulphate solution?A MagnesiumB CopperC LeadD Iron

9 The diagram below shows the apparatus used to study the reaction of magnesium,iron and copper with oxygen.

Which of the following observations are true?

Metal ObservationI Magnesium Burns brightly with a

white flameII Iron Moderately reactive,

glows brightlyIII Copper Most reactive, burns

brightly

A I onlyB I and II onlyC II and III onlyD I, II and III

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10 The diagram below shows a chemical reaction.

What is the gas released?A OxygenB HydrogenC Carbon dioxideD Nitrogen dioxide

11 A piece of zinc is placed into the hydrochloric acid and gas released is collected asshown in the diagram below.

The time taken to collect 5cm3 of gas is recorded. This experiment is repeated withmagnesium and iron, which are the same amount as zinc.Which of the following shows the correct comparison of time to collect 5cm3 of gasfor each experiment?

Time recorded/sZinc Magnesium Ir

A 30 10 6B 60 10 3C 60 30 1D 10 60 3

dilute sulphuric acid

zinc foil

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12 The diagram below shows the extraction of iron in the blast furnace.

A IronB CarbonC OxygenD Limestone

13 The process in which electrical energy is used to break down a chemical compoundis known asA anodeB cathodeC electrolyteD electrolysis

14 The diagram below shows electroplating of an iron spoon.

What is solution X?

A Silver nitrateB Iron (II) sulphateC Aluminium nitrateD Copper (II) sulphate

substanceP+

haematite+

cokehot air

molten iron

hot airslag

waste gases

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15 The diagram below shows the apparatus used to study the electrolysis of moltenlead (II) bromide.

Which of the following happens?I A brown gas is released at the anodeII A shiny grey metal is produced at the cathodeIII The ammeter shows a readingA I and II onlyB I and III onlyC II and III onlyD I, II and III

16 Information above shows the extraction of metal P, Q and R from their oxides. Whichof the following shows the correct sequence of the metal reactivity in descendingorder?A P,Q,RB P,R,QC Q,P,RD Q,R,P

Calcium and copper can extract P from itsoxides. Q can extract calcium from its oxides. Calcium can extract metal R from its oxide

metals. Copper cannot extract R from its oxide

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17 The diagram below shows a simple cell which is connected to an ammeter.

Which of the following pairs of electrodes, P and Q and electrolyte will give readingon the ammeter?

P Q ElectrolyteA Zinc Zinc Dilute hydrochloric acidB Copper Zinc Sugar solutionC Aluminium Copper Copper (II) chlorideD Tin Lead Methylbenzene

18 What type of battery is used in cars?A Nickel-cadmium batteryB Acid-lead accumulatorC Silver oxide batteryD Alkaline battery

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Which of the following statement is true about the dry cell shown in the abovefigure?I Zinc cover is a negative terminalII Carbon rod is a positive terminalIII Manganese dioxide acts as an electrolyte

A I onlyB I and II onlyC II and III onlyD I, II and III

20 The figure below shows the set-up of experiment which is placed in sunlight for 5hours.

What is gas P?A OxygenB NitrogenC HydrogenD Carbon dioxide

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STRUCTURED QUESTIONS

Section A

1 Diagram 1 shows the apparatus set up to study the reaction between zinc and dilutehydrochloric acid. A gas is produced and collected in a burette.Catatan: R : Aras Rendah Science Form 4S: Aras SederhanaT : Aras Tinggi

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The experiment is carried out for 10 minutes and the volume of gas is recorded every 2minutes. The results are shown in Table 1.

Time (minutes) 0 2 4 6 8 10Volume of gas (cm3) 0 10 20 30 40 50

a) Write down one observation for the above experiment.

[1 mark]

b) State one responding variable in this experiment.

[1 mark]

Diagram 1

Table 1

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c) (i) Based on Table 1, draw a graph to show the relationship between thevolume of gas and the reaction time.

[2 marks]

d) What is the relationship between the volume of gas and the reaction time?

[2 marks]

e) Predict the volume of gas collected by the twelfth minute.

..[2 marks]

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2 Diagram 2 shows an arrangement of the apparatus in an experiment to study theproduction of electrical energy. Aluminium and lead are used in the experiment.

The experiment is repeated by using other pairs of metals. The voltmeter reading isrecorded in Table 2.

Diagram 2Catatan: R : Aras Rendah Science Form 4S: Aras SederhanaT : Aras Tinggi

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Pair of metals Voltmeter reading/VZinc and lead 0.6Lead and lead 0.0

Table 2

a) Write down the voltmeter reading with the appropriate unit for the pair of metals,aluminium and lead.

[1 mark]

b) What can you infer from the deflected voltmeter needle?

[1 mark]

c) State the variables in this experiment.

(i) Manipulated variable:

(ii) Responding variable:[2 marks]

d) Predict the voltmeter reading when a pair of aluminium plates are used.

[1 mark]

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3 Diagram 3 shows an experiment to study endothermic reaction

The result of the experiment is r

(a) Complete table 3.

(b) Write down one inference

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

(c) State the variables in this e(i) manipulated variable

...................................................(ii) responding variable:

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

(d) What is the operational de

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

Material

Water

Water + Ammonium nitra

Diagram

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ecorded in Table 3.

[1 mark]based on Table 3.

...........................................................................[1 mark]

xperiment.:

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

.................................................................................2 marks]

finition of endothermic reaction?

................................................................................[1 mark]

Temperature (oC)

30

te .................................

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Table 3


Section B

4 Diagram 4 shows the apparatus set-up for electroplating an iron spoon.

a) Name the process that is used to electroplate the iron spoon as shown inDiagram 4.

[1 mark]

b) State the material that is used as

i) Anode : .

ii) Cathode: .[2 marks]

Diagram 4

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b) What solution can be used as an electrolyte in this electroplating process?

..[1 mark]

c) The switch is left for 30 minutes. What can be observed at

i) the iron spoon?

ii) the copper plate?

...[2 marks]

d) Give one use of electroplating.

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[1 mark]5 Diagram 5 shows the apparatus to investigate the production of electrical energy

from a simple cell.

a) Suggest a suitable substance which can be used as the solution.

[1 mark]

b) Label the negative and positive electrodes of the cell in Diagram 5.[2 marks]

c) What will be the effect on the voltage if the following changes are made in theapparatus?

i) Zinc is used to replace copper

Diagram 5

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ii) Silver is used to replace copper

iii) Copper is used to replace magnesium

[3 marks]


6 Diagram 6 shows an experiment to study the reactivity of metals with oxygen.

The observations of the experiment is shown in Table 4.

Metal ObservationMagnesium Burns vigorously with bright lightAluminium Burns moderatelyZinc Burns slowlyCopper Glows dimly

Table 4

a) What is the function of the

Diagram 6


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i) potassium manganate (VII)?

.ii) glass wool?

.[2 marks]

c) Name the products which are formed when metals reacts with oxygen.

[1 mark]

d) Based on the observations, arrange the reactivity of metals with oxygen inascending order.

[1 mark]

e) Write a word equation for the reaction of magnesium with oxygen.

..[1 mark]

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7 Diagram 7 shows an electrolysis to split up copper (II) chloride.

a) What are electrodes L and M made of?

[1 mark]

b) Which is the positive electrode?

Diagram 7

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[1 mark]

c) Does the galvanometer shows a reading before the copper (II) chloride ismelted? Why?

[2 marks]

d) What is formed at the

i) anode?

.

ii) cathode?

.[2 marks]

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Section C

8 Study the following statement:

You are given a tripod stand, evaporating dish, Bunsen burner, spatula, magnesiumpowder, zinc powder, copper powder and dilute sulphuric acid.

(a) Suggest a hypothesis to investigate the above statement.[1 mark]

(b) Describe an experiment to test your hypothesis based on the following criteria:

(i) Aim of the experiment [1 mark]

(ii) Identification of variables [2 marks]

(iii) List of apparatus and materials [1 mark]

(iv) Procedure [4 marks]

(v) Tabulation of data [1 mark]

Different metals react with acid at different rates.

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9 There are two types of change in matter, physical change and chemical change.a) State three characteristics and one example of a physical change.

[4 marks]Diagram 8 shows chemical changes in three different substances.

b) Study the information in Diagram 8 and construct the concept of chemicalchange.

Your answer should be based on the following steps; Identify the information [1 mark]

Identify two common characteristics [2 marks]

Develop an initial concept [1 mark]

Give another example and a non-example in relation to the concept[1 mark]

State the actual concept [1 mark]

Burning of copper(II) carbonate Rusting of iron nail

Burning of paper

Diagram 8

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07_jpnt_scn_f4_modul4.pdf

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