65594486 teknik menjawab kimia 3 spm

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Perkongsian Amalan Teknik

Menjawab Soalan ChemistryPaper 3 SPM (4541 / 3)

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Format of Paper 4541 / 3

► Time  ; 1hr 30 minutes

► Marks  ; 50 marks

► (i) Construct Tested;

Science Process Skills (16 aspects)

Task   ; answer all 2 or 3 questions in 1hr 30 min

Level of Difficulty  – L : M : H = 5:3:2

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(1) Structured questions (45 minutes)

Making observation, inferencing, identifying and

controlling the variables, hypothesising,classifying, making operational definition, reading

instruments / measurements, constructing table,plotting graph, predicting, interpreting data.

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(2) Extended Response Item (45minutes)

►Stating aim / problem statement (always a question !), hypothesis, listing the variables,materials & apparatus, writing theprocedure, tabulation of data.

►( A diagram usually helps in this question though there is no specific

allocation of marks for diagram, because certain steps left out in the

procedure write-up may be able to be inferred from the diagram) )

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(ii) Scoring for item :

3 marks – Excellent : The best response

2 marks – Satisfactory : An average response

1 mark – Weak : An inaccurate response0 mark – No response or Wrong response

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(B) Guide on Answering

► (i) Answering the StructuredQuestions:

Quite similar to the structured questions inSection A of Chemistry Paper 2, butemphasises on the process skills:

Recall the topic / sub-topic and application ofthe concepts and theories related to thequestion;

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►(ii) Answering the ExtendedResponse Item (Designing / Planningof experiment)

No need to give complete report ( as the PEKAreport) as this is only the planning stage.

Procedure is preferably written in the activeform (although the passive form is also

accepted)

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Normally the question requires :

(a) Problem Statement / Aim

(b)  All the variables

(c) Hypothesis(d) List of materials and apparatus

(e) Procedure

(f) Tabulation of data

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(C) GUIDE TO MARKING PAPER4541/3 :

1. Bilingual answer / Mixed language isaccepted. ( BM or BI only )

2. Grammatical errors are ignored.

3.  Avoid use of American spelling system.(e.g. color, oxidize)

4. Wrong spelling – often ignored unless fortechnical terms e.g. alkane, covalent bonding,chlorine atom……. 

5.  Avoid using abbreviation.6. List of substances and apparatus.

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7. Case when more than one answer isgiven.

e.g. a student gives 2 answers for

hypothesis, then the score awardeddepends on the accuracy of bothanswers

Hypothesis 1 Hypothesis 2 Score awarded

3 2 2

3 1 2

3 0 2

1 2 1

0 1 1

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8. Making observation  – In Paper 3, observationis drawn from sight only ! (NOT from all 5 senses

like in Paper 2 !!)e.g. reject „ beaker feels warm ‟  

accept „ temperature rises „ 

9. Graph sketching / plotting

Should show axes with arrowhead with correctlabels, correct units & correct shape (curve orline)

10. Diagrams for the set-up of apparatus – notrequired but encouraged

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11. Constructing a table :

title of heading be based on the terms usedin question : (e.g. question use „Initial

temperature‟ , students cannot change it to

 „starting / beginning temp‟ ) 

12. Stating volume of a liquid and mass of a

solid►   the use of the words “amount” and “quantity”  

is rejected.

(e.g. Constant Variable : amount of HCL is the

same – wrong ! Must say the volume &

concentration of HCL is the same.

Rate of reaction is the same because the quantity 

of reactants used is the same – REJECT !! )

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13. Accuracy in taking measurements

►Degree of accuracy depends on the type and

calibration of instrument used► Able to give accuracy to at least one decimal 

place is expected for score 3;

14. Calculations

► Formula should use commonly used symbols,

e.g. : H = mcǿ ►Correct units must be stated

►Steps must be shown clearly

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(D) Some Terms Markers Use

a)  “wrong cancel right” (wcr) 

b)  “benefit of doubt” (bod) 

c)  “error carried forward” (ecf) d)  “avoid double penalty” (adp) 

e) Reject (r) and Accept (a)

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(E) Popular topics in Paper 3 :

►  questions are based on activities andexperiment;

 Applications of theories and conceptsrather than memorisation; 

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1. Determination of empirical formula ofmetal oxide. (Q1 – 2004)

2. Change of state of matter : e.g. boilingpoint / freezing point of naphthalene

(Q1 – 2005)

3. (a) Construction of reactivity series ofmetals towards oxygen

(b) Reaction of Group 1 and Group 17 ofPTE. (Q2 – 2004,2008)

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4. Electrochemistry

(a) Construction of ECS : Q2 – 2005

(b) Chemical cell / Factor affectingvoltage: Q2 – 2007

(c) Electrolysis cell / Application ofelectrolysis ( extraction of reactive

metals, electroplating & purification ofmetal factors ) and factors affectingselective discharge of ions.

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5. Comparing physical or chemicalproperties of :

(i) an alloy-pure metal,

(Q3 – 2003, Q3a – 2005)

(ii) vulcanized rubber – natural rubber,

(Q2 – 2006)

(iii) hydrocarbons – relating RMM andphysical properties.

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6.  Acids & Bases And Salts

(a) role of water in showing acidity &alkalinity

(b) titration

(c) qualitative analysis of cations & anions

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7. Preparation of

(a) soluble salts of potassium, sodiumand ammonium.

(b) other soluble salts.

(c) insoluble salts.

(d) continuous variation method

(Q2 – 2003)

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8. Rates of reactions – determination fromgraph and calculation

a) Effect of concentration: (Q3b – 2005)

b) Effect of temperature; (Q1 – 2003)c) Effect of total surface area:

d) Effect of catalyst:

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9. Preparation & properties of esters(esterification). (Q3 – 2004)

10.  Redox

a) rusting : Q3a – 2003b) Effect of another metal an rusting

c) Conversion of iron(II) and iron(III) ions,

redox cell

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11.  (a) Thermochemistry : Q1 – 2007

(b) Heats of reaction :

(i) precipitation

(ii) displacement(iii) neutralisation – Q1 – 2006

(iv) combustion

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12. (a) Preparation of soap

12.(b) Comparing effectiveness ofdifferent detergents

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Paper 3

► All questions are based on what thestudents have studied in the syllabus

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Decimal place … 

►Burette  2 decimal places

 25.00 cm3 / 0.00 cm3 

►

Thermometer / stopwatch one decimal place

 25.0 oC / 3.5 s

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 Variables :

►State only one variable for controlled / fixedvariable

►If state more than one variables, one of theanswers is wrong, then the wrong willcancel the right (wcr effect !)

Skill th t ill b l t d i P

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Skills that will be evaluated in Paper

3 (Structure)

1. Observation2. Classifying3. Measuring and Using Numbers4. Making inference5. Communicating6. Using Space and Time Relationship7. Interpreting Data

8. Defining Operationally9. Controlling Variables10.Making hypothesis

11.Predicting

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Plan / Design an experiment

►Problem statement (always a ?Statement)

►Hypothesis (can be a positive or negative

hypothesis )►Identifying and controlling variables.

►Suitable apparatus and material

►Procedures►Result (Tabulating data) – Don‟t fill in

any data because u are planning an

experiment

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