Section c Scheme Scf4 Midyear

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Section c scheme (science f4)

10 (a) Reaction of reactive metals with acid produce a higher volume of gas/the more reactive the metal the higher the volume of gas produced1 m(Semakin reaktif logam semakin tinggi isipadu gas terbebas)

(b) (i) To study the reactivity of metals with acid1 m

(Mengkaji kereaktifan tindakbalas logam dengan asid)(ii) Manipulated variable: type of metal (Jenis logam)

  Responding variable: volume of gas collected (isipadu gasterkumpul)  Controlled variable: concentration of dilute sulphuric acid(kepekatan asid sulfurik)

(any two) m(iii) boiling tube! cor" stopper! delivery tube! glass trough! water!

magnesium powder! #inc powder! copper powder dilute sulphuricacid and test tube$

1 m

  %$ The volume of gas collected is recorded in a table$ (Isipadu gas yang terkumpul direkodkan dalam jadual)

(any four) &m

(v) Tabulation of data

Type of metal Volume of gas (cm3)

MagnesiumZinc

Copper 

1m

  Total 10

m

11 C2 (a) 'ble to state parts of brain

 Answer:

Cerebrum ! cerebellum ! medula oblongata

(any two)

mParts of brain Main fuction

(iv) 1$ % cm of dilute sulphuric acid is poured into a boiling tube$(5 m! asid sulfurik dituang ke dalam tabung didi")

  $ ' spatula of magnesium powder is added into the boilingtube$

  (Satu spatula serbuk magnesium ditamba" ke dalam tabungdidi" tersebut)  $ The gas released is collected in a test tube$

  (#as yang terbebas dikumpul di dalam tabung uji)  &$ teps 1* is repeated using #inc and copper powder$

  ($angka" %&! diulang menggunakan serbuk 'ink dan kuprum)

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Cerebrum Control controlled actions

Cerebellum Control body balance

Medula oblongata Control uncontrolled actions

('ny two correct pairs)

m

Total 4 m

b) 'ble to show steps in developing concept

• +dentify two identical characteristics m

• ,evelop early concept 1

m

• -ive another e.ample 1

mand non*e.ample

1 m

• .plain the real concept

1 m

Total 6 m

Model answer 

Identical

characteristics

1. ecreted by endocrine glands (to coordinate body acti!ities) ü 

" #ne hormone only has one specific function. ü

$arly concept % &ind of chemical secreted by endocrine glands to coordinate bodyacti!ities) ü

#ther e'ample

and

 one'ample

Controlling secondary se' characteristic ü

Controlling body balance ü

*eal concept +ormone (is a &ind of organic chemical secreted by endocrine glands in

small ,uantity) to coordinate body acti!ity. ü 

Total 10 m

12  (a) Methods of puri0cation

(i) iltration (enurasan)(ii) Crystallisation (eng"abluran)(iii) ,istillation (enyulingan) 3

m iltration is a process of separation solid from li2uid

(enurasan iala" proses pengasingan pepejal daripada eair)

Crystallisation is the process of forming crystals from a li2uid or gas(eng"abluran iala" proses pembentukan "ablur daripada eair atau

gas)

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,istillation is a process to obtain a pure li2uid from a solution of li2uidmi.ture(enyulingan iala" proses meng"asilkan eair tulen daripada larutan

berampur)

  'ny one correct answer1 m

(a) 3roblem statement : The salt dissolve in the water (to form salt solution)$1m

4ame of the method used : ,istillation

1 m

teps of the method used

alt solution is heated  The re2uired solution boils and turns into vapour

 The thermometer measures the temperature of the vapour  The vapour is then cooled in the condenser 5hen the vapour cools down! it condences into pure li2uid

  'ny & correct answer

4 m

Total marks 10m