Skema_kimia_k3

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Skema kertas 3 pertengahan tahun 2007

Question No.

3 2 1

1(a) Able to record all the readings

accurately to twodecimal pointwith unit

Sample answer:0.20cm 3& 30.20cm3

1.!0cm3 & 32.00cm3

Able to record all the

readings accuratelywithout decimal pointbut with unit""able torecord all the readingsaccurately without unitbut with decimal point

Able to record all the

reading correctly withoutdecimal point and withoutunit

a# reading $rom bottom

1(b) Able to construct a table thatcontains the $ollowingin$ormation

1. %eading in the table2. rans$er all reading$rom 1(a) correctly

3. 'ith unit at the heading

p. * p. **

+inalreading(cm3)

*nitial

reading(cm3)

,olume o$acid (cm3)

a # p *""%-l and Na% p **"%2/ and Na%

Able to construct a tablethat contains $ollowingin$ormation

1. heading in thetable2. no unit "with unit

in data section

Able to construct a tablethat contains $ollowingin$ormation

1. 2 columns withheading only

( c) Able to mae accuratehiptesis by showing therelationship betweenmanipulated and responding

ariables

Sample answer#'hen di$$erent types o$ acidare used 4 di$$erent olume o$acids are re5uired to reach theend point

Able to mae correcthypothesis by statingthe (manipulatedariables)" (responding

ariables)

Sample answer:6i$$erent acids are usedto get the end point""di$$erent olume o$ acidsare used to get the endpoint"" to get the endpoint

Able to state the idea o$hypothesis

Sample answer,olume o$ acids""types o$acids


2/5

(e) Able to state the reasonaccurately why initial and $inalburette readings are recorded

Sample answer#o get"$ind the olume o$ acid

hended to $ind the molarity o$acid used

Able to state the reasoncorrectly why initial and$inal burette readingsare recorded

Sample answer:

to get the (olumeo$)"total acid used

Able to gie the idea whyinitial and $inal burettereadings are recorded

Sample answer#o $ind "get the acid

used"needed""to$ind " getthe end point

(d) Able to state all the threeariables accurately

Sample answer#7anipulated ariables#di$$erent types o$ acid used8esponding ariables #ndpoint

-onstant ariables#olume o$alali"Na% ""olume o$ acid

Able to gie any twoariables correctly

Able to gie any oneariables correctly

($) Able to gie correctly anythree pairs o$ obseration anin$erences

Sample answer#

bseration *n$erence

-hanges o$

colour

Alali

changes toacid

,olume o$acid isreduced

7ore acid isneeded $ortitration

9urettereadingincrease

Acid is used$or titration""acid drip $romthe burette

/olution in theconicle $las

increase

Acid andalali are

mied

Able to gie any twopairs o$ obseration andin$erences correctly

Able to gie any one pairscorrectly

(g) Able to gie the changes o$colour correctly and accurately

Sample answer:in colour change tocolourless

Able to gie thechanges o$ colourcorrectly

Sample answer#:in change colour ""change to colourless"nocolour

Able to gie the idea o$colour change

Sample answer#-lear:in;ight pin-olourless


3/5

(h) Able to gie the operationalde$inition accdariNa% produces 1 mol o$water

Able to gie theoperational de$initioncorrectly

Sample answer:he reaction between

acid and alali producessalt and water "" thereaction between ion %=and %> produce water

Able to gie any idea o$operational de$inition

Sample answer#'ater4 reaction between

acid and alali

(i) Able to predict accurately andcorrectlySample answer

1.,olume %2/ needed isdoubled2. 2! cm3

Able to predict andcorrectly

Sample answer :

%igher4increase

Able to gie any idea topredict

Sample answer#

;ittle4a $ew4not much

(?) Able to classi$y all the acidsaccurately and correctly

Sample answer#

Name o$acids

ypes o$acids

%-l /trong% 2/ /trong

-% 3-% wea

Able to classi$y any twocorrectly

Able to classi$y any onecorrectly

QuestionNo.

/core 3 /core 2 /core 1

2(a) Able to gie the accurateproblemstatement.8esponse is

in the 5uestion $orm.(ignore the 5uestion mar)

Sample answer#%ow does the reactiity o$ group* elements"(alali metals)("metals @4 and B )change when react with waterC

Able to gie the correctproblem

statement.8esponse isin the 5uestion$orm(ignore the 5uestionmar)

Sample answer'hat is the reactiity o$group * elementsC "" 6ogroup * elements reactwith waterC

Able to gie the idea o$problemstatement

Sample answer8eactiity change"" 8eacwith water


4/5

2(b) Able to gie all three ariablesaccurately and correctly.Sample answer#7anipulated ariables# di$$erent

types o$ metals8esponding ariables# reactiity-onstant ariables # siDe o$metals

Able to gie any twoariables correctly

Able to gie any oneariables correctly

2(c) Able to state the relationshipbetween the manipulatedariable and respondingariable and the directionaccuratelySample answer#

'hen going down Eroup *4metals @4 and B becomesmore reactie in their reactionswith water

Able to state therelationship between themanipulated ariableand responding ariable

Sample answer'hen going down Eroup

* 4the reaction o$ metals@4 and B with waterbecomes more reactie""Eroup * metals reactwith water igorously

Able to state idea o$hypothesis

Sample answer( 7etals )reactie""react

igorously

2(d) Able to list all the materials andapparatus needed accurately

sample answer#7aterials # metals @4 and B4water

Apparatus#Fni$e4 $orceps4basin"watertroughs44$ilter paper

Able to list ade5uatematerials and apparatuscorrectly

Sample answer#7aterials # any 2

metals4 waterApparatus # ni$e

Able to list any one metaand water

Sample answer#@ " " Band water

2(e) Able to write all the procedurescorrectly

Sample answer#1. -ut a small piece o$

metal @ using a ni$e anda $orceps

2. 6ry the oil using $ilterpaper3. :lace metal @ slowly onto

water sur$ace in a trough. 8ecord your obserations

!.8epeat using metals and B

Able to write ade5uateprocedures

Sample answer#/teps 14 steps 3 andsteps

Able to write minimumprocedures

Sample answer#/teps 1 and steps 3""/teps 3 only


5/5

2($) Able to ehibit the tabulation o$data that includes the $ollowing$our in$ormation#

1. heading $or themanipulated

2. all metals

3. heading $or theresponding ariables. 2 " 2 tables

Sample answer#

metals

bseration"reactiity

@

B

Able to ehibit thetabulation o$ data thatincludes the $ollowingin$ormation#1. %eading $or themanipulated and

responding ariables2. 2 metals

Sample answer

Able to ehibit thetabulation o$ data thatincludes the $ollowingin$ormation

1. heading $or themanipulated"respo

ding ariable2. 1 metal

Sample answer

elements

obseration

@

7aterial"substance

@

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