MAJLIS PENGETUA SEKOLAH MALAYSIA CAWANGAN PULAU PINANG SKEMA JAWAPAN MODUL LATIHAN BERFOKUS SPM 2013 KIMIA KERTAS 1 454111 www. myschoolch ild ren .com :: w w w . m s c ho lc hildre n . c o w w w . s c ho o lc hildre n . c o m u a ttu ru (p e rcu m a )so a la n la idi:M u a ttu ru (p e rcu a )ske m a la in di
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7 (a) VandYHave same proton number but different nucleon number
1
1 27 (b) 1
2
34
7 valence electronsGroup 17
Three shells occupied with electronsPeriod 3
1
1
1
1 47 (c) 1. lonic compound
2. Any two:. Can coMuct electricity in motten or aqueous state. High melting / boiling point. Soluble in water // lnsoluble in organic solvent
1
1
1 3
7 (d) (i) W * Vz ------>WV, 1 1
( ii) 1. Electron arrangement of atom V is 2.8.7 andatom W is 2.8.2
2. Atom W donates two valence electrons3. To achieve stable octet electron arrangement4. Form ion Wz* tt W _> W2* * 2e5. The electrons are transferred to two atom V6. Atom V accepts one etectron7. Form V- ion ll V + e ----> V-
B. V- and W2* are attracted together by a strong electrostaticforce
9. lonic compound of WV2 is formed10. Diagram. CorLct number of electrons in each shell. Label ion and show charges
]'
1
1
1
1
1
1
1
1
1
1 10
Total 20-
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2. Reacts with metals that are more electropositive than hydrogen toproduce salt and hydrogen gas
3. Reacts with bases and alkalis to form salt and water
[Note: Accept any suitable answer]
1
1
1 3
B (b) 1. Ethanoic acid is a weak acid while nitric acid is a strong acid2. Ethanoic ionises partially in water to produce lower concentration
of hydrogen ions
3. Nitric acid ionises completely in water to produce higherconcentration of hydrogen ions
4. Higher concentration of hydrogen ions, pH value is lower
1
1
1
1 4
B (c) 1. Ammonia in chloroform exists as molecules2. There are no hydroxide ions present
3. Ammonia ionises partially in water to produce hydroxide ion.4. NHs + HzO -+ NHc* + OH-
5. The presence of OH- ions makes the solution alkaline'
1
1
1
1
1 5
B (d) (i) A solution which has a known concentration 1 1
( ii) 1. Mol KOH = 0.1 x 250 11000 = 0.025
2. Mass KoH
= ?.lrrt
- (3e + 16 + 1)
3. Put 1.4 g of KOH in a beaker and pour a small amount of distilled:
water.4. Stir the solution until all solid KOH dissolves5. Transfer the solution of KOH into the volumetric flask.6. Distilled water is added into the solution in the flask until the
graduation mark 250 cm3.
7, itre ttast is ctosed tightly with the stopper and the content is
1
1
1
1
1
1
1 7
Total 20
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Question Marks Scheme Marks1(h) Able to predict the three positive terminals and three vortage
values forall
pairsof metals correctly
Sample answer:
Pair of MetalsPasangan logam
Positive TerminalTerminal Positif
Voltage / VVoltan / V
WandX X 2.0
XandY X 0.6
W andZ Z 2.4
6
Able to state any five correct positive terminals and voltage 5
Able to state any four correct positive terminals and voltage 4
Able to state any three correct positive terminals and voltage 3
Able to state any two correct positive terminals and voltage 2
Able to state any one correct positive terminal and voltage 1
No response or wrong response 0
Question Marks Scheme Marks1(i) Able to classify all the four substances correctly
Sample answer:
Can be made as electrolvte Cannot be made as electrolvteSodium chloride solutionDilute sulphuric acid
Glucose solutionGlacial ethanoic acid
3
Able to classify any three substances corectlv 2
Able to classify anV two substances correctly 1
No response or wrono response 0
Question ' Marks Scheme Marks2(a) Able fo sfafe the problem statement accurately.
Samole answerWhat is the effect on rusting when iron is in contact with other metals?ll How do different types of metals in contact with iron affect rusting?
3
Able fo sfafe the problem statement but less accurately.
Samole answerWhat is the effect of other metals on rusting?ll To investiqate the effect of different metals on the rustinq of iron.
,2.
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Question Marks Scheme Marks2(d) Able to give a complete list of materials and apparatus that irwoi,fues tne
following.
1. lron nails2. 1 metal above iron in electrochemicalseries3. 1 metal below iron in electrochemicalseres4. A suitable electrolyte, test-tubes, sand paiper
Sample answer:lron nails, magnesiumlzinclaluminium strip, tin/copper/lead/silver strip,hot jelly containing potassium hexacyanoferrate(lll) solution, test tubes/boiling tubes, sand paper
3
Able to give a list of materials and apparatus that invotves iite followng:1. 1 metal above iron in electrochemicalseries
2. 1 metal below iron in electrochemicalseries3. Any suitable electrolyte, any suitable container
2
Able to give a list of materials and apparatus that involves the fdllowing:1. 1 metal above/below iron in electrochemical series //
any su itable electrolyte.2. Any container
1
No response or wrong response 0
Question Marks Scheme Marks2(e)
Able to state the following 6 sfeps;1. [Clean iron nails and metal sfnps With sand papei]2. [Coil the iron nails with the metats]3. [Place the iron nails in separate container]4. [Pour/add/fill the [electrolyte] into the containerl5. [Leave them aside for several days]6. [Record your obseruation]
Sample answer:1. clean iron nails, magnesium ribhon and copper strip with sand
:
paper.
2. Coit two iron nails tightly with magnesium ribbon and copperstrip.
3. Place all the iron nails in separate test tubes.4. Pour the hot jelly containing potassium hexacyanoferrate(lll)
5. Keep the test tubes in a test tube iack and leave lhem aside forseveral days.
6. Record your observations,
3
Steps 2,4,6 2Step 2[coil iron nail with Mg/Cu], 4 1
No response or wrono response 0
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Question Marks Scheme Marks2(f) Able to exhibit the tabulation of data that includes the following four
information
1. Heading for the manipulated variable ; Sef // Pair of metals2. Examples of Sets // Pair of metals t l, ll // Mg-Fe, Cu-Fe3. Heading for responding variable : Obseruation4. 2x3 or 3x2 table
Sample answer:
Set /l Pair of metals ObservationI // Mq-Fe
ll ll Cu-Fe
2
Able to exhibit the tabulation of data that includes the following twoinformation
1. 1/3 from score 22. 2x2 table
Saniple answer:
Set // Pair of metals Observation
1
No response or wrong response 0
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