65594486 teknik menjawab kimia 3 spm
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8/10/2019 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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