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    BENGKEL KIMIA

    KERTAS 4541/3(2011)

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    1-2 STRUCTURED ITEMS

    1 OPEN-ENDED RESPONSE

    ITEM

    ANSWER ALL QUESTIONS

    50 MARKS

    DURATION 90 MINUTES

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    a) 1-2 SOALAN STRUKTUR :

    (KK0501 KK0511)

    b) 1 SOALAN ESEI :

    (KK051201 KK051205)

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    KK 501 - OBSERVING

    USING THE SENSE OF

    HEARING, TOUCH, SMELL,

    TASTE AND SIGHT TO

    COLLECT INFORMATION

    ABOUT AN OBJECT OR APHENOMENON

    ex. Q1b)

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    1 BROWN SOLID IS FORMED

    2 BUBBLES OF GAS RELEASED

    3 ORANGE SOLUTION TURNS

    GREEN. 4 THE INTENSITY OF BLUE COLOURED

    SOLUTION REMAINS UNCHANGED/

    INCREASE/ DECREASE

    5 THE MASS INCREASE

    6 YELLOW PRECIPITATE IS FORMED

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    KK 0502 - CLASSIFYING

    USING OBSERVATION TO

    GROUP OBJECTS OREVENTS ACCORDING TO

    SIMILARITIES OR

    DIFFERENCES

    Q2c

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    1. CATIONS AND ANIONS

    2. OXIDISING AGENTS AND REDUCING

    AGENTS

    3. OXIDATION AND REDUCTION

    4. EXOTHERMIC AND ENDOTHERMIC

    REACTIONS

    5. ELECTROLYTES AND NON-

    ELECTROLYTES

    6. SATURATED AND UNSATURATED

    HYDROCARBON

    7. STRONG AND WEAK ACIDS/ ALKALIS

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    KK 0503 MEASURING

    AND USING NUMBERS

    MAKING QUANTITATIVE

    OBSERVATIONS USING

    NUMBERS AND TOOLS WITHSTANDARDISED UNITS.

    MEASURING MAKES

    OBSERVATION MORE

    ACCURATE.

    Q1a

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    Example

    1. BALANCE MASS

    2. BURETTE VOLUME OF SOLUTION

    3. VOLTMETER VOLTAGE

    4. STOPWATCH TIME

    5. THERMOMETER TEMPERATURE

    6. RULER DISTANCE/ HEIGHT/

    LENGTH

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    KK 0504 - INFERRING

    USING PAST EXPERIENCES OR

    PREVIOUSLY COLLECTED DATATO DRAW CONCLUSIONS AND

    MAKE EXPLANATIONS OF

    EVENTS

    Q1c

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    1. COPPER IS FORMED

    2. O2

    /H2

    /CO2

    IS LIBERATED/GIVENOUT/RELEASED

    3. DICHROMATE(VI) ION IS REDUCEDTO Cr3+

    4. THE CONCENTRATION OF Cu2+ INTHE SOLUTION REMAINSUNCHANGED/DECREASES/INCREASES

    5. Mg REACTS WITH O2 TO FORM MgO

    6. PbI2 IS FORMED AND INSOLUBLE INWATER

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    KK 0505 - PREDICTING

    STATING THE OUTCOME OF A

    FUTURE EVENT BASED ONPRIOR KNOWLEDGE GAINED

    THROUGH EXPERIENCES OR

    COLLECTED DATA

    Q1g

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    1. PREDICT TIME TAKEN(FROM

    A GRAPH)

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    KK 0506 - COMMUNICATING

    USING WORDS OR GRAPHIC

    SYMBOLS SUCH AS TABLES,

    GRAPHS, FIGURES OR MODELS

    TO DESCRIBE AN ACTION,

    OBJECT OR EVENT.

    Q2b

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    1. DRAW GRAPH

    2. CONSTRUCT TABLE

    3. WRITE EQUATION

    4. ARRANGE METAL IN

    DESCENDING ORDER OFELECTROPOSITIVITY

    5. DRAW APPARATUS SET UP

    6. DRAW ELECTRON STRUCTURE

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    KK 0507 USING SPACE-

    TIME RELATIONSHIP

    DESCRIBING CHANGES IN

    PARAMETER WITH TIME.EXAMPLES OF PARAMETERS

    ARE LOCATION, DIRECTION,

    SHAPE, SIZE, VOLUME, WEIGHTAND MASS.

    Q1f(ii)

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    1. STATE THE RELATIONSHIP

    BETWEEN SIZE OF

    REACTANT AND RATE OFREACTION

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    KK 0508 INTERPRETING

    DATA

    GIVING RATIONALEXPLANATIONS ABOUT AN

    OBJECT, EVENT OR PATTERN

    DERIVED FROM COLLECTEDDATA.

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    1. EXPLAIN WHY THERE IS NOCHANGE IN THE COLOUR

    INTENSITY OF THE

    SOLUTION

    THE Cu2+

    DISCHARGED AT THE

    CATHODE IS REPLACED BY

    THE IONISATION OF COPPERANODE.

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    KK 0509 DEFININGOPERATIONALLY

    DEFINING CONCEPTS BYDESCRIBING WHAT MUST BE

    DONE AND WHAT SHOULD BE

    OBSERVED.

    Q1e

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    1. WHEN BLUE LITMUS PAPER

    TURNS RED, THE SOLUTIONFORMED SHOWS ACIDIC

    PROPERTY

    2. ELASTICITYOF RUBBER ISTHE DIFFERENCE BETWEEN

    THE LENGTH AFTER THE

    WEIGHT USED TO STRETCHIT IS REMOVED AND THE

    ORIGINAL LENGTH

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    KK 0510 CONTROLLING

    VARIABLES

    IDENTIFYING THE FIXED

    VARIABLES, MANIPULATED

    VARIABLE AND RESPONDING

    VARIABLE IN AN INVESTIGATION.

    THE MANIPULATED VARIABLE ISCHANGED TO OBSERVE ITS

    RELATIONSHIP WITH THE

    RESPONDING VARIABLE. AT THESAME TIME, THE FIXED VARIABLES

    ARE KEPT CONSTANT.

    Q2a

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    MANIPULATED VARIABLE SIZEOF REACTANT

    RESPONDING VARIABLE

    TIMETAKEN TO COLLECT 20 cm3 OFGAS

    FIXED VARIABLE

    CONCENTRATION OF ACID

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    KK 0511 - HYPOTHESISING

    MAKING A GENERAL STATEMENTABOUT THE RELATIONSHIP

    BETWEEN A MANIPULATEDVARIABLEAND A RESPONDINGVARIABLEIN ORDER TO EXPLAIN ANEVENT OR OBSERVATION. THIS

    STATEMENT CAN BE TESTED TODETERMINE ITS VALIDITY.

    Q1d

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    THE SMALLERTHE SIZE OF

    REACTANT, THE SHORTERTHETIME TAKEN TO COLLECT 20 cm3OF GAS

    THE FURTHER THE DISTANCEBETWEEN TWO METALS IN THE

    ELECTROCHEMICAL SERIES, THEHIGHER IS THE VOLTAGE OF THECELL PRODUCED

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    KK 1512 PLANNING

    EXPERIMENT

    AIM/ PROBLEM STATEMENT

    VARIABLESHYPOTHESIS

    APPARATUS AND MATERIALS

    PROCEDURE

    TABULATION OF DATA

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    CHEMISTRY 4541

    PAPER 3

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    PLANNING OF EXPERIMENT

    Students are required to study asituationor a given task.

    Based on the situation or the giventask, students are required toplan

    an experimentto investigate thesituation or the given task

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    The answer should include :

    Problem statement/aim

    HypothesisList all the variables

    List of materials and apparatus

    (Draw the set up of apparatus tohelp you in procedure as well aslist of materials and apparatus)

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    The answer should include :

    Procedure

    Tabulation Data.

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    1 Statement of problem Able to make astatement of the

    problem accurately andmust be inquestionform

    2 All the variables Able to stateall thethree variablescorrectly

    3 Hypothesis Able to state therelationshipbetweenmanipulatedvariableandresponding

    variable correctly

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    4 List of materials and

    apparatus

    Able to state the listof substances andapparatus correctlyandcompletely

    5 Procedure Able to state acompleteexperimentalprocedure

    6 Tabulation of data Able to exhibit the

    tabulation of datacorrectly with suitableheadingsand units

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    You need to do or think ofDo question 3 in 45 minutes

    Do not leave empty answers

    Label the table with unit but need

    not be filled with data

    Write the plan for the experimentsimilar to what you would do when

    writing a PEKA CHEMISTRY report.

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    ANSWERS (Form 4)

    1a) [Observing]Able to record all the four readingscorrectly with one decimal place.

    Answer

    Voltage/ V

    Voltan /V

    2.71.10.82.0

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    1b) [Controlling Variables]

    Able to stateall threevariables correctly Sample answer

    Manipulated variable : Pair of metals // W,

    X, Y and Z

    Responding variable : Voltmeter reading// voltage//Potential difference

    Fixed variable : Copper(II)

    sulphate solution //voltmeter //

    Copper

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    1c) [Hypothesising]

    Able to suggest a correct relationshipbetween theMVand theRVwithdirection

    Sample answer

    The further the distance between two

    metals in the electrochemical series, thehigher is the voltage / the voltmeter

    reading

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    1d) [Interpreting Data]

    Able to arrange the position of all metals correctly

    Sample answer

    Y , Cu , X , Z , W

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    1e) [Predicting]

    Able to predict the voltage withunit correctly

    Sample answer1.9 V

    1f) [Ob ti d I f i ]

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    Able to state three observations and threecorrect their corresponding inferences

    Sample answer

    1f) [Observation and Inferring]

    Observation

    Pemerhatian

    Inference

    Inferens

    1. Magnesium dissolves //becomes thinner

    1. Magnesium is oxidised// loses electron to

    from Mg2+ // Mg

    change to Mg2+

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    2. (Brown) solid is

    deposited at copper

    // Copper becomesthicker

    2. Copper is formed //

    Cu2+ discharged //

    Cu2+ change to Cu

    3. Voltmeter needle

    deflected //Deflection of

    voltmeter needle

    decreases

    3. Electricity

    produced //electrons flow //

    Electricity produced

    decreases4. The intensity of blue

    colour solution

    deceases

    4. The concentration

    of Cu2+ in the solution

    decreases

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    Able to describe (1) what should be done and(2) what should be observed

    correctly

    Sample answer1. Dip two different types of metals into CuSO4solution and connect them to voltmeter

    2. Mg becomes thinner and brown solid isdeposited at copper//

    Voltmeter needle deflected//Reading of voltmeter

    decreases.

    1g) [Defining Operationally]

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    ANSWERS WITH IN CORRECT TERMS, WORDS ORINCORRECT KEY WORDS.

    NO. INCORRECT TERMS[TIDAK TEPAT]

    CORRECT TERMS[TEPAT]

    1. Chocolate precipitate[Mendakan coklat]

    2. A stable atom[Atom yang stabil]

    3. Electron configuration[Konfigurasi electron]

    Brown precipitate

    Atom that achieves octetarrangement

    Electron arrangement

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    NO. INCORRECT TERMS[TIDAK TEPAT]

    CORRECT TERMS[TEPAT]

    4. Clear solution[Larutan jernih]

    5 Iodide ion stop reacted or

    reaction stops.[ion iodida bertindak balasdengan lengkap]

    6. Reaction does not occur[Tindakbalas tidak berlaku]

    Colourlesssolution

    All iodide ions

    have reactedcompletely

    No change inreaction

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    NO. INCORRECT TERMS[TIDAK TEPAT]

    CORRECT TERMS[TEPAT]

    7. Hasten the rate of reaction[Mempercepatkan kadartindakbalas]

    8. Burning in oxygen[Pembakaran karbon]9. Magnesium is more active

    than zinc[Magnesium lebih aktifdaripada zink]

    The rate ofreaction increases

    Heating in oxygen

    Magnesium is

    more reactive thanzinc

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    NO. INCORRECT TERMS[TIDAK TEPAT]

    CORRECT TERMS[TEPAT]

    10. ECS11. In the electrochemical series,

    magnesium is more reactivethan zinc[Untuk siri elektrokimia,

    magnesium lebih reaktifdaripada zink]

    12 In the reactivity series,magnesium is more

    electropositive than zinc[Untuk siri kereaktifan,magnesium lebih elektropositifdaripada zink]

    Electrochemical

    series

    In the electrochemicalseries, magnesium is

    more electropositivethan zinc

    In the reactivity

    series, magnesium ismore reactive thanzinc

    NO INCORRECT TERMS CORRECT TERMS

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    NO. INCORRECT TERMS CORRECT TERMS13 Add ammonia.

    Add iodine.Add sodium hydroxide

    Add silver nitrate[Campurkan ammonia,cmpurkan iodine,campurkan natrium hidroksida,campurkan argentum nitrat]

    14 Potassium permanganatesolution[Larutan kalium permanganate]

    15 Polistirene prevents heat loss.Polistirene can avoid heat loss.[Polistirena adalah penghalanghaba,Polistirena dapat mencegahkehilangan haba]

    Polystyrene reducesheat loss

    Acidified potassiummanganate(VII) solution

    Add ammonia solution.

    Add iodine solution.

    Add sodium hydroxidesolution.

    Add silver nitratesolution

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    NO. INCORRECT TERMS CORRECT TERMS16 Melting point is the point where

    solid changes to liquid.[Takat lebur ialah takat dimanapepejal berubah menjadicecair]

    17 Conduct electric[Mengkonduksikan elektrik]

    18 Saponification is a process ofmaking soap by hydrolysisprocess.[Saponifikasi ialah prosesmembuat sabun secarahidrolisis]

    Saponification is a

    process of makingsoap by hydrolysisof an ester

    Conduct electricity

    Melting point is thetemperature where

    solid starts to changeto liquid

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    NO. INCORRECT TERMS CORRECT TERMS19 Outermost number of electrons

    [Bilangan electron terluar]20 The function of the salt bridge is

    to complete the circuit and toseparate two solutions.[Fungsi titian garam ialahmelengkapkan litar danmengasingkan larutan]

    21 Sodium donates electron[Natrium menderma electron] Sodium atom donates

    one electron

    The function of the saltbridge is to complete theelectric circuit whichallows ions to move

    The number of electrons

    in the outermost shellfilled with electron