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4541/2 kimia srk2 phg

CONTENTS

Section A

Q1- Bab jirim (10 m Aras 1)

Q2 Bab Struktur (10 m aras 1)

Q3 Jadual Berkala (10 m aras 1)

Q4 Ikatan (10 m aras 1)

Q5 Elektrokimia (10 m aras 1)

Q6 Formula kimia (10 m aras 2)

Section B

Q7 Asid bes (10 Aras 2), 5 m Aras 3

Q8 Elektrokimia (10 Aras 2), 5 m Aras 3

Section C

Q9 Industri/ garam (10 Aras 2), 5 m Aras 3

Q10 Formula kimia//ikatan (10 Aras 2), 5 m Aras 3

Answer

Edited by mshg smka phg


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SECTION AThis Section consists of 6 Structural Questions, answer all questions. You are advised 20 minutesfor each question. (60 marks)

Question 1

Particle No of Protons Number of neutrons Number of ElectronsV 3 4 2W 6 6 6X 11 12 10Y 17 18 18Z 18 20 18

Table 1

1. Table 1 shows the number of proton, neutron and electron for particle V, W, X, Y and Z. basedon information given in Table 1, answer the following questions.

a. What is the charge for particle X_______________________________________________________________ [1 m]

b. What is the nucleon number for particle W

_______________________________________________________________ [1 m]

c. Write the electron arrangement for atomV : _____________________

Z : _____________________ [2 m]

d. Draw the electron arrangement for particle X [1 m]

Y [1 m]

e. Particle X and Y can react to form a compound. Draw a diagram showing the electron

arrangement for the compound formed by the reaction.



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[2 m]

f. Can particles V and Z react with each other? Explain your answer.

[2 m]



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Question 2

Diagram 1

Diagram 1 shows electrons arrangement for deferens 4 particles.

a) State the number of protons for the particles below :

(i) M ; ____________________

(ii) J ; ____________________

[2 m]

b) Write the electron configuration for atom S

________________________________________________________________________

[1 m]

c) Write the electron configuration when J particle is stable

_______________________________________________________________________

[1 m]

d) M and J element react together to form a compound

(i) State a physical property of the compound

__________________________________________________________________

[1 m]

(ii) Draw the electronic configuration diagram of the compound

[ 2m]

e) J exist as diatomic molecule naturally

(i) Write an equation of the reaction that will occur between Z and J

___________________________________________________________________

[2 m]

(ii) What is make J exist as a gas not a solid in the room temperature

___________________________________________________________________

[1 m]


S +

M +2 ZJ

S +M 2+ Z

J


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Question 3

1 2 13 14 15 16 17 18

A B C DE F G H

I TRANSITIONELEMENTS

J

Table 2

Table 2 shows elements in the Periodic Tables. These elements are represented by the letters A,B, C, D, E, F, G, H, I and J.

a) Which element has a biggest size atom?________________________________________________________________________

[1m]

b) Write two metallic element?

_______________________________________________________________________ [1m]

c) Write down the formula of ion F.

________________________________________________________________________ [1m]

d) Explain briefly why G more electronegative then F?______________________________________________________________________

______________________________________________________________________[2m]

e) i. Write down the electron arrangement of H?

______________________________________________________________________ [1m]

ii. What is the use of H?

______________________________________________________________________ [1m]

f) Which element is the most electropositive?

________________________________________________________________________ [1m]



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g) Write the balance equation when A react with water.

________________________________________________________________________ [2m]

h) Which element is the metalloid?

________________________________________________________________________ [1m]

Question 4

4. Table 3 show aqueous solution of W, X, S, Q and T with same concentration of 0.5 moldm -3 and their respective pH value.

Aqueoussolution W X S Q T

pH value 2 6 7 9 13TABLE 3

Based on Table 3 answer the question below using the aqueous solution symbol.

a) Name 1 of the indicator that can be used to measure the pH value.

____________________________________________________________ [1m]

b) Choose 1 solution which contain:i. Higher concentration of hydrogen ion.

_________________________________________________________ [1m]

ii. Higher concentration of hydroxide ion.

_________________________________________________________ [1m]

c) Match the solution in Table 3 with the suitable chemical substance given below.[2m]

Chemical substance Aqueous solution//pH valueSodium chlorideSodium hydroxideEthanoic acidSulphuric acidToothpaste Q

TABLE 4

d) Considering W is sulphuric acid. When a piece of lime stone (calcium carbonate) isadded into W. The colorless bubble gases evolve and stop few second.



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i. Name the colorless bubble gas?

_________________________________________________________ [1m]

ii. Name the solution that commonly used to identify the gas evolve?

_________________________________________________________ [1m]

iii. Why did the evolve gas of the colorless bubble gas stop after a few second?

_________________________________________________________

_________________________________________________________ [1m]

Question 5

5 Figure below shows the set-up of apparatus to investigate the electrolysis of dilutecopper(II) sulphate solution.

Diagram 2

(a) (i) What is meant by cation ?

[ 1 m ](i) What is the energy change that occurs in the electrolysis process?

[ 1 m ]



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(b) In the electrolysis of dilute copper (II) sulphate solution,

(i) state all the ions in the electrolyte.

[ 1 m ]

(ii) in the table below, write the ions in (b) (i) which moved to electrodes X and Y.

Electrode X Electrode Y

Table 5

[ 2 m ]

(iii) What are the processes that occur at electrodes X and Y ?

Electrode X :

Electrode Y :

[ 2 mark ]

(iv) What would you observe at electrode Y ?

[ 1 mark ]

(v) What is the colour change of the electrolyte ?

[ 1 mark ]

(c ) (i) Name the gas collected in the test tube at electrode X.

[ 1 mark ]

(ii) The volume of gas collected at electrode X is 20.0 cm 3. How manymoles of the gas were collected ?Use the information that 1 mole of gas occupies a volume of 24.0dm 3 at room temperature and pressure.

[ 1 mark ]



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(iii) Based on the answer in (c) (ii), what is the number of gas moleculescollected ?Use the information that the Avogadro number is6.02 x 10 23 mol -1 .

[ 1m]

Question 6

a. What are the reactants for above reaction?

.............................................................................................................................[1m]

b. Write the chemical formula for calcium chloride

............................................................................................................................[1m]

c. Rewrite the equation above as chemical equation

............................................................................................................................[2m]

d. If 50.0 g of calcium carbonate react completely in the reaction abovecalculate

i) The mole of Calcium carbonate given [RAM C, 12; Ca, 40; O, 16]

[1m]

ii) the number of mole of hydrochloric acid being used? [ RAM H, 1; Cl, 35.5]

[1m]


acid hydrochloric(aq) + calcium carbonate(s) calcium chloride(aq) +carbon dioxide(g) + water(l)


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iii) the mass of calcium chloride obtained [RAM; Ca, 40; Cl, 35.5]

[2m]

iv) the volume of carbon dioxide gas collected at room temperature [V M=24 dm 3]

[1m]



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SECTION B

Question 7

Essay equation

a. Using a labeled diagram, Describe an experiment to show how an iron spoon iselectroplate with another metal. In your description, give the observation and equations for the reaction occurred ( 12 marks )

a. Dengan mengunakan gambarajah berlabel, terangkan satu eksperimen yang menunjukkanbagaimana sudu besi disadurkan dengan logam lain. Dalam penerangan sertakanpemerhatian dan persamaan bagi tindakbalas yang berlaku ( 12 markah )

b) Explain why some type of acids and bases are stronger than the others. Elaborate a scale

that can represent the strength of acids and bases. [ 8 marks ]

Question 8

a. You are given a sodium hydroxide solution with concentration of 40 g dm -3, hydrochloric solutionwith unknown concentration and phenolphthalein indicator. Assuming that all apparatus aregiven, elaborate an experiment that you will carry out to determine the concentration of thesulphuric acid. Show clearly how to calculate the concentration of the sulphuric acid.

[ 12 marks ]

b.



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Section C[20 marks ]

Answer any one question from this sectionThe time suggested to complete this section is 30 minutes

Question 9

9

Diagram 1

The flow chart in diagram 1 shows a series of substance Z changesCarta alir dalam rajah 1menunjukkan siri-siri perubahan sebatian Z

(a) Solution T is the product obtained from the reaction between substance Z andDistill water Larutan T adalah hasil tindakbalas daripada tindakbalas bahan Z dengan air suling.

(i) Name the possible ion presents in solution TNamakan kation-kation yang mungkin hadir dalam larutan T [2 marks]

(ii) Describe the confirmatory test for an ion in solution T.

Terangkan ujian pengesahan bagi satu ion dalam larutan T [6 marks]

(b) Name gas R and gas Z

Namakan gas R dan gas Z [2 marks]

(c) Describe an experiment how to prepared Z iodide salt from solid Z in the laboratory .Huraikan satu eksperimen bagaimana garam iodin Z daripada pepejal Z didalam makmal.

[10 marks]

Question 10


Substance ZBahan Z

Solid U + Gas R(brown gas) +

Gas ZPepejal U

Yellow cool ,

Solid V

Pepejal V

Solution T

Larutan T

Solid V is solublewhen heated

heatpanaskan

+ Dilute hydrochloric acid + asid hidroklorik cair

+ distill water + air suling Heated / Panaskan


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(a) Consider the following statements.(i) Reactivity of the element in Group 17 of the Periodic Table decreases from the top to

the bottom of the group.[ 6 marks ]

(ii) The boiling point of the element in group 17 of the Periodic Table increases from thetop to the bottom of the group.

[4 marks ]For each of the above statements, explain the reasons for the elements showing the trendsmentioned based on the electron configuration and the atoms size.

(b) Bromine react with hot Iron to form iron(III) bromide salt. By using labeled diagram, write theexperiment procedures to show the reaction between Bromine and iron.

[ 10 marks ]


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