latih tubi sumatif

QUESTION 1/ SOALAN 1:

Diagram below shows the symbols of the atoms of element X and Y. The letter used are not the actual symbols
of the elements.
Rajah dibawah menunjukkan simbol atom bagi unsur X dan Y. Huruf yang digunakan bukan merupakan unsur
sebenar bagi unsur.

(a) State the proton number of the atom of element X
Nyatakan nombor proton bagi atom unsur X.

……………………………………………………………………………
[1 mark]

(b) (i) Identify the position of element X in the Periodic Table of Elements.
Kenal pasti keduudkan unsur X dalam Jadual berkala Unsur.

……………………………………………………………………..
[1 marks]

(ii) Explain why element X and element Y is placed in the same period in
the Periodic Table of Elements.
Jelaskan mengapa unsur X dan unsur Y di tempatkan pada kala yang sama
dalam Jadual Berkala Unsur.

………………………………………………………………………………….
…………………………………………………………………………………

[2 marks]

(c) Compare the size of atom X and atom Y
Bandingkan saiz bagi atom X dan atom Y.

……………………………………………………………………………….
[1 mark]

(d) Write the electron arrangement of atom X and atom Y.
Tulis susunan elektron bagi atom X dan atom Y.

Atom X : …………………………

Atom Y : …………………………

[2 marks]

(e) Element X and element Y can react to form a compound.
Unsur X dan unsur Y boleh bertindak balas untuk membentuk satu sebatian.

(i) State the type of compound formed.

Nyatakan jenis sebatian yang terbentuk.

………………………………………………………………………….
[1 mark]

(ii) Draw the electron arrangement of the compound formed.
Lukis susunan elektron bagi sebatian yang terbentuk.

[2 marks]

QUESTION 2/ SOALAN 2:

Compound J Heat Oxide M / Oksida M + Gas L
Sebatian J Panaskan [Brown when hot, yellow when cooled] [Colourless]

[Perang masa panas, Gas L
kuning semasa sejuk] [tanpa warna]

+ dilute nitric acid
+ asid nitrik cair

Colourless J Reaction I White precipitate Q
solution Tindak balas I dissolved in excess sodium hydroxide solution
Larutan
+ NaOH (aq) Mendakan putih Q
Tanpa warna J larut dalam larutan natrium hidroksida berlebihan

Reaction II + Na2SO4 (aq)
Tindak balas II

White Diagram 3
precipitate R Rajah 3
mendakan putih R

Diagram 3 shows a series of process done by a student to identify a compound J.
Rajah 3 menunjukkan satu siri tindak balas yang dilakukan oleh pelajar bagi mengenal pasti sebatian J.

(a) With refer to reaction I, white precipitate Q is formed which is dissolved in
excess sodium hydroxide solution.
Name all the cation which are probably presence in solution J.
Dengan merujuk kepada tindak balas I, mendakan putih Q yang terbentuk larut
dalam larutan natrium hidroksida berlebihan.
Namakan kesemua kation yang mungkin hadir dalam larutan J.

......................................................................................................................................

[ 1 mark]

(b) Referring to reaction I and II,
name the cation presence in solution J.
Merujuk kepada tindak balas I dan II,
Namakan kation yang hadir dalam larutan J.

...................................................................................................................................
[1 mark]

(c ) Write the ionic equation for the reaction forming the white precipitate, R.
Tulis persamaan ion bagi tindak balas pembentukan mendakan putih, R.

………………………………………………………………………………………
[2 marks]

(d) Name two cations which produced white precipitate that
will not dissolve in excess sodium hydroxide solution.
Namakan dua kation yang menghasilkan mendakan putih yang tidak larut
dalam larutan natrium hidroksida berlebihan.

…………………………………………………………………………………………
[1 mark]

(e) State one confirmatory test for one cations presence in (d).
Nyatakan satu ujian pengesahan bagi satu kation yang hadir di (d)

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[4 marks]

QUESTION 3/ SOALAN 3

When 124g of copper(II) carbonate is heated, black colour of the residue and colourless gas produced.

Apabila 124g kuprum(II) karbonat dipanaskan, baki pemanasan berwarna hitam dan gas tanpa warna terhasil.
[Given that the relative atomic mass of Cu,64;O,16;C,12: Volume of 1 mol of gas = 24 dm3 at room condition]
[Diberikan jisim atom relatif bagi Cu,64;O,16;C,12: Isipadu 1 mol gas = 24 dm 3 pada keadaan bilik]

i. Write the chemical equation for the reaction. [2 marks]
Tulis persamaan kimia bagi tindak balas tersebut.

……………………………………………………………………………..

ii. Describe the chemical equation in (i). [1 mark]
Perihalkan persamaan kimia di (i)

………………………………………………………………………………..
………………………………………………………………………………...

iii. Name the residue and the colourless gas produced.
Namakan baki pemanasan dan gas tanpa warna yang terhasil [2 marks]

………………………………………………………………………………..

iv. State the physical properties of the residue. [1 mark]
Nyatakan sifat fizik bagi baki pemanasan tersebut.

………………………………………………………………………………

v. Calculate:
Hitung:
a) the number of mole of copper(II) carbonate used.
Bilangan mol bagi kuprum(II) karbonat yang digunakan. [1 mark]

b) the volume of colourless gas produced. [3 marks]
Isipadu gas tanpa warna yang terhasil

vi. Write a chemical equation when the residue is reacted with

hydrochloric acid.

Tulis persamaan kimia apabila baki pemanasan bertindak balas

dengan asid hidroklorik [2 marks]

……………………………………………………………………………..

vii. Based on chemical equation in (vi),
Describe chemical test that can be used to verify the cation in the solution
for the salt formed.
Berdasarkan persamaan kimia di(vi),

Huraikan ujian kimia yang boleh digunakan untuk mengenalpasti kation
dalam larutan garam yang terbentuk.

[ 3 marks]

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QUESTION 4/ SOALAN 4

Table 5 shows the information on action of heat for two lead salts, P and Q.
Jadual 5 menunjukkan maklumat bagi tindakan haba ke atas dua garam plumbum, P dan Q.

Table 5 [6 marks]
Jadual 5 [6 markah]

Based on Table 5, identify residue R, gas A, gas Band gas C.
Write the chemical formulae for salt P and salt Q.
Berdasarkan Jadual 5, kenal pasti baki R. gas A, gas B dan gas C.
Tulis formula kimia bagi garam P dan garam Q.

Answer/Jawapan:

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QUESTION 5/ SOALAN 5

Diagram 6 shows the reaction scheme of lead(II) carbonate.
Rajah 6 menunjukkan skema tindak balas bagi plumbum(II) karbonat

Diagram 6
Rajah 6

Lead(II) carbonate reacts with nitric acid to produce salt X, gas Y and water. Gas Y turns lime water
chalky.
Plumbum(II) karbonat bertindak balas dengan asid 6itric untuk menghasilkan garam X, gas Y dan air.
Gas Y menukarkan air kapur menjadi keruh.

Based on Diagram 6, identify salt X and gas Y.

Describe briefly chemical tests to verify the cation and anion in X solution.

Berdasarkan Rajah 6, kenal pasti garam X dan gas Y. [7 marks]

Huraikan secara ringkas ujian kimia untuk mengesahkan kation dan

anion dalam larutan X.

[7 markah]

Answer/Jawapan:

……………………………………………………………………………………………………………………...
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QUESTION 6/ SOALAN 6

Table below shows the number of protons, neutrons and electrons present in atom Q and atom X. The letter
used are not the actual symbols of the atoms.
Rajah di bawah menunjukkan bilangan proton, neutron dan elektron dalam atom Q dan atom X.Huruf yang
digunakan bukan simbol sebenar bagi atom-atom itu.

Atom Number of protons Number of neutrons Number of electrons
Bilangan proton Bilangan neutron Bilangan elektron
Q 11 12 11
X 17 18 17

(a) (i) State the term for “the total number of protons and neutrons” in an atom.
Nyatakan istilah bagi “jumlah bilangan proton dan neutron” dalam satu atom.

……………………………………………………………………………………….
[1 mark]

(ii) Name the two subatomic particles present in the nucleus of an atom.
Namakan dua zarah subatom yang terdapat dalam nukleus suatu atom.

………………………………………………………………………………………..

[1 mark]

(iii) Draw the electron arrangement of Q ion.
Lukis susunan electron bagi ion Q.

[2 marks]

(b) (i) Atom Y is an isotope of atom X.
State the number of protons in atom Y.
Atom Y ialah isotop bagi atom X.
Nyatakan bilangan proton dalam atom Y.

………………………………………………………………………………

[1 mark]

(ii) Atom X and atom Y show the same chemical properties.

State one reason.
Atom X dan atom Y menunjukkan sifat kimia yang sama.
Nyatakan satu sebab.

…………………………………………………………………………………
[1 mark]

(c ) (i) Element X has a boling point of -34.0 0C .
Predict the physical state of element X at room temperature.
Unsur X mempunyai takat didih -34.0 0C .
Ramalkan keadaan fizikal bagi unsur X pada suhu bilik.

…………………………………………………………………………………..
[1 mark]

(ii) Based on the kinetic theory of matter, describe the arrangement and movement of
particles of element X at room temperature.
Berdasarkan teori kinetik jirim, huraikan susunan dan pergerakan zarah bagi unsur
X pada suhu bilik.

……………………………………………………………………………………………….
……………………………………………………………………………………………….
……………………………………………………………………………………………….
……………………………………………………………………………………………….
……………………………………………………………………………………………….
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[3 marks]

QUESTION 7/ SOALAN 7

(a) Isotopes are used for example in medicine, industry, sciences and archeology.
Choose two of the above example.
State an isotope and its purpose in each example that you chosen.
Isotop digunakan contohnya di dalam ubat, industri, sains dan arkeologi.
Pilih dua daripada contoh di atas.
Nyatakan satu isotop dan kegunaannya dalam setiap contoh yang telah anda pilih.

………………………………………………………………………………………………………………………
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[4 marks]

(b) Diagram below shows the electron arrangement of a molecule PQ2.
The letter used are not the actual symbols of the elements.
Rajah di bawah menunjukkan gambar rajah susunan elektron bagi molekul PQ2.

Huruf ini bukanlah simbol sebenar bagi unsur itu.

Based on Diagram above, write the electron arrangement for atoms of element P and element
Q.
Explain the position of element Q in the periodic Table of the Elements,
Berdasarkan rajah di atas, tuliskan susunan elektron bagi atom unsur P dan atom unsur Q.
Terangkan kedudukan unsur Q dalam Jadual Berkala Unsur.

………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………
………………………………………………………………………………………………………………………

[2 marks]

(c ) Table below shows the electron arrangement for atoms W,X and Y.
The letters are not the actual symbols of the elements.
Jadual di bawah menunjukkan susunan elektron bagi atom W, X dan Y.
Huruf ini bukanlah simbol sebenar bagi unsur itu.

Element Electron arrangement
Unsur Susunan elektron
2.4
W 2.8.7
X 2.8.8.2
Y

Using the information in Table above, explain how two compounds can be formed from these
element based on their electron arrangements.
Dengan menggunakan Jadual di atas, terangkan bagaimana dua sebatian boleh terbentuk
daripada atom-atom itu berdasarkan susunan elektronnya.
Dua sebatian itu hendaklah mempunyai jenis ikatan yang berlainan.

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QUESTION 8/SOALAN 8

Sodium reacts with chlorine to form sodium chloride
Natrium beritndak balas dengan klorin bagi membentuk natrium klorida

2Na + Cl2 → 2NaCl

What is the mass of sodium chloride formed when 2.30g of sodium reacts with excess chlorine?
Apakah jisim bagi natrium klorida yang terbentuk apabila 2.30g natrium bertindak balas dengan klorin secara
berlenihan?
[Relative atomic mass/Jisim atom relatif: Na,23;Cl,35.5]
[Answer/Jawapan: 5.85g]

Note/Nota:
1. No of mole/Bilangan mol
2.Ratio of mole/ nisbah mol
3. Answer/Jawapan

QUESTION 9/SOALAN 9

The equation below represents the reaction to extract aluminium from aluminium oxide.
Persamaan dibawah mewakili tindak balas bagi mengekstrak aluminium daripada aluminium oksida

2Al2O3 → 4Al + 3O2

What is the mass of aluminium that can be extracted from 102g of aluminium oxide?
Apakah jisim aluminium yang boleh diekstrak daripada 102g aluminium oksida?
[Relative atomic mass/ Jisim atom relatif:O,16;Al,27]
[Answer/Jawapan: 54.0 g ]

Note/Nota:
1. No of mole/Bilangan mol
2.Ratio of mole/ nisbah mol
3. Answer/Jawapan

QUESTION 10/SOALAN 10

The following equation represents the neutralization reaction between barium hydroxide, Ba(OH)2 and
hydrochloric acid, HCl.
Persamaan berikut mewakili tindak balas penenutralan antara barium hidroksida, Ba(OH)2 dan asid hidroklorik,
HCl.

Ba(OH)2 + 2HCl → BaCl2 + 2H2O

What is the volume of 0.5 mol dm -3 hydrochloric acid needed to neutralize 25 cm 3 of 0.1 mol dm -3 barium
hydroxide?
Apakah isipadu asid hidroklorik 0.5 mol dm -3 yang diperlukan bagi meneutralkan 25 cm 3 barium hidroksida
0.1 mol dm -3 .
[Answer/ Jawapan: 10.0 cm 3 ]

Note/Nota:
1. No of mole/Bilangan mol
2.Ratio of mole/ nisbah mol
3. Answer/Jawapan

QUESTION 11/SOALAN 11

The equation shows the reaction between sulphuric acid and sodium hydroxide.
Persamaan menunjukkan tindak balas antara asid sulfurik dan natrium hidroksida.

H2SO4 + 2 NaOH → Na2SO4 + 2H2O

What is the volume of 1.0 mol dm -3 sodium hydroxide solution which can neutralize 25.0 cm 3 of 1.0 mol dm -3
sulphuric acid?
Apakah isipadu larutan natrium hidroksida 1.0 mol dm -3 yang boleh meneutralkan 25 cm 3 asid sulfurik
1.0 mol dm -3 .
[Aswer/ Jawapan: 50.0 cm 3 ]

Note/Nota:
1. No of mole/Bilangan mol
2.Ratio of mole/ nisbah mol
3. Answer/Jawapan

QUESTION 12/ SOALAN 12

(a) The following are three examples of sulphate salts that can be prepared in the laboratory
Berikut adalah tiga contoh garam sulfat yang boleh disediakan di dalam makmal.

▪ Sodium sulphate,
Natrium sulfat,

▪ Barium sulphate
Barium sulfat

▪ Zinc sulphate
Zink sulfat

(i) From these examples, identify the soluble and insoluble salts.
Daripada contoh-contoh ini, kenal pasti garam terlarutkan dan garam tak terlarukan.

………………………………………………………………………………………

[2 marks]

(ii) state the reactants for the preparation of the insoluble salts in (a)(i).
Nyatakan bahan tindak balas bagi penyediaan garam tak larut di (a)(i).

………………………………………………………………………………………..
[1 mark]

(b ) Table below shows the observations from some test carried out on salts X.
Jadual di bawah menunjukkan pemerhation ke atas ujian yang dijalankan ke atas garam X.

Test Observation
Ujian Pemerhatian
I: Heating of salts X solid A metal oxide is formed and a brown gas is
Pemanasan pepejal garam X given off
Suatu oksida logam terbentuk dan gas
II: Salts X solution is mixed with excess berwarna perang terbebas
aqueous ammonia A white precipitate which is insoluble in
Larutan garam X dicampur dengan excess aqueous ammonia is formed
ammonia akueus berlebihan Mendakan putih yang tak larut dalam
ammonia akueus berlebihan terbentuk

Based on the information above:
Berdasarkan maklumat di atas:

(i) Identify an anion that is present in Test I and describe a chemical test to verify the
anion.
Kenal pasti satu anion yang hadir dalam Ujian I dan huraikan satu ujian kimia untuk
megesahkan anion itu.

………………………………………………………………………………………….
[4 marks]

(ii) Identify two cations that are present in Test II and describe a chemical test to verify
the cations.
Kenal pasti dua kation yang hadir dalam Ujian II dan huraikan satu ujian kimia
untuk mengesahkan kation itu.

………………………………………………………………………………………….
………………………………………………………………………………………….
………………………………………………………………………………………….
………………………………………………………………………………………….

[4 marks]
QUESTION 13/ SOALAN 13
Diagram 1 shows the arrangement of atoms in two types of copper alloy.
Rajah 1 menunjukkan susunan atom dalam dua jenis aloi bagi kuprum.

Pure metal in alloy X/Logam tulen dalam aloi X: ……………………………………………..
Main impurity in alloy X/logam bendasing utama dalam logam X: …………………………….
Pure metal in Broze/Logam tulen dalam gangsa: ……………………………………………..
Main impurity in Bronze/logam bendasing utama dalam gangsa: …………………………….
Pure metal in Pewter/Logam tulen dalam pewter: ……………………………………………..
Main impurity in pewter/logam bendasing utama dalam pewter: …………………………….
Pure metal in duralumin/Logam tulen dalam duralumin: ……………………………………………..
Main impurity in duralumin/logam bendasing utama dalam duralumin: …………………………….

QUESTION 14/SOALAN 14

Diagram 2 shows part of the Periodic Table of Elements.
Rajah 2 menunjukkan sebahagian daripada Jadual Berkala Unsur.

Diagram 2/ Rajah 2

(a) Based on Diagram 2, answer the following questions. [1 mark]
What is the element represented by the symbol Fe?
Bedasarkan pada Rajah 2, jawab soalan-soalan berikut.
Apakah unsur yang diwakili oleh simbol Fe?

…………………………………………………………………………………………

(b) In Diagram 2, mark ‘X’ in the boxes for all the transition elements. [1 mark]
Dalam Rajah 2, tandakan ‘X’ dalam kotak bagi semua unsur peralihan

…………………………………………………………………………………………

(c ) State one specific characteristic of transition elements. [1 mark]
Nyatakan satu cirri istiwewa bagi unsur peralihan

…………………………………………………………………………………………

(d) Write the electron configuration for the Mg atom. [1 mark]
Tulis susunan elektron bagi atom Mg.

…………………………………………………………………………………………

(e) Write the chemical equation for the reaction between aluminium and oxygen gas.
Tulis formula kimia bagi tindak balas antara aluminium dengan gas oksigen [1 mark]

…………………………………………………………………………………………

(f) Briefly state the electron transfer in the bond formation between aluminium and oxygen.

Nyatakan secara ringkas pemindahan electron bagi pembentukan ikatan antara aluminum

dengan oksigen. [ 2 mark]

…………………………………………………………………………………………
…………………………………………………………………………………………

(g) State one gas is more suitable to be used in meteorological balloons. [1 mark]
Give a reason.
Nyatakan satu gas yang sesuai digunakan dalam balon meteorology.
Berikan satu sebab.

…………………………………………………………………………………………

QUESTION 15/SOALAN 15

Diagram below shows part of the Periodic Table of the Elements.
Q,R,T,X and Y do not represent the actual symbol of the elements.
Rajah dibawah menunjukkan sebahagian daripada Jadual Berkala Unsur.
Q,R,T,X dan Y tidak mewakili symbol sebenar bagi unsur.

Group/Kumpulan

Period/Kala

(a) Using the letters in the Periodic Table of the Elements in Diagram above, answer the
following questions.
Dengan menggunakan huruf di dalam Jadual Berkala Unsur diatas, jawab soalan-soalan
berikut.

(i) Choose an element that is a halogen. [1 mark]
Pilih unsur yang merupakan halogen

…………………………………………………………………………………………

(ii) Which element is monoatomic? [1 mark]
Unsur yang manakah adalah monoatom?

…………………………………………………………………………………………

(iii) Which element forms an amphoteric oxide? [1 mark]
Unsur yang manakah membentuk oksida amfoterik?

…………………………………………………………………………………………

(b) Arrange Q,R,T,X and Y according to the increase in size of the atoms. [1 mark]
Susun Q,R,T,X dan Y mengikut bertambahan saiz atom.

…………………………………………………………………………………………

(c ) Write the electron arrangement for an atom of element Q. [1 mark]
Tulis susunan elektron bagi atom unsur Q.

…………………………………………………………………………………………

(d) Write the formula for the ion formed from an atom of element Y. [1 mark]
Tulis formula bagi ion yang terbentuk dari atom unsur Y.

…………………………………………………………………………………………

(e) Why are elements Q and R placed in the same period? [1 mark]
Mengapakah unsur Q dan R ditempatkan pada kala yang sama.

…………………………………………………………………………………………

(f) When a small piece of element T is put into water, TOH solution is formed and
hydrogen gas is released.
State one observation when red litmus paper is put into the solution.
Apabila seketul kecil unsur T diletakkan kedalam air, larutan TOH terbentuk dan
gas hidrogen dibebaskan.
Nyatakan satu pemerhatian apabila kertas litmus merah dimasukkan kedalam larutan.
[1 mark]

…………………………………………………………………………………………

(g) State the common name of the elements between group 2 and group 13.
Nyatakan nama biasa bagi unsur antara kumpulan 2 hingga kumpulan 13. [1 mark]

…………………………………………………………………………………………

QUESTION 16/SOALAN 16

Diagram below shows part of the Periodic Table of Elements.
Rajah dibawah menunjukkan sebahagian daripada Jadual Berkala Unsur

Based on diagram above:
Berdasarkan kepada rajah diatas

(a) (i) name one element which is a metal. [1 mark]
Namakan unsur yang merupakan logam.

…………………………………………………………………………………………

(ii) which group and period is the metal in (a)(i) found in? [1 mark]
Kumpulan dan kala apakah logam di(a)(i) dijumpai?

…………………………………………………………………………………………

(b) (i) Name the element that exists a a monoatomic gas. [1 mark]
Namakan unsur yang ujud sebagai gas monoatom?

…………………………………………………………………………………………

(ii) Explain why this gas is monoatomic. [2 marks]
Jelaskan mengapa gas itu adalah monoatom?

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(c ) Sodium reacts with oxygen gas to form sodium oxide, Na2O.
Natrium bertidak balas dengan gas oksigen bagi membentuk natrium oksida, Na2O.

(i) write a balanced chemical equation for this reaction [2 marks]
Tulis persamaan seimbang bagi tindak balas tersebut.

…………………………………………………………………………………………
…………………………………………………………………………………………

(ii) sodium oxide reacts with water to produced a solution.
In table below, mark (√) in the box which shows the value of pH

of the solution.

Natrium oksida bertidak balas dengan air untuk menghasilkan satu larutan.
Dalam jadual dibawah, tandakan (√) dalam kotan bagi menunjukkan nilai pH

larutan

tersebut [1 mark]

pH value/Nilai pH
4 7 11

(iii) State which is more electronegative, sodium or chlorine.

Explain your answer.

Nyatakan yang manakah lebih elektronegatif, natrium atau klorin.

Jelaskan jawapan anda. [2 marks]

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QUESTION 17/SOALAN 17

1. Hydrochloric acid is a strong acid. Table 4 shows two solutions of hydrochloric acid, P and Q,
of different concentrations.
Asid hidroklorik adalah asid kuat. Jadual 4 menunjukkan dua larutan asid hidroklorik, P dan Q
Pada kepekatan yang berbeza.

Hydrochloric acid solution / Concentration/ kepekatan

larutan asid hidroklorik (mol dm-3)

P 0.100

Q 0.001

Table 4/Jadual 4

(a) State the meaning of an acid. [1 mark]
Nyatakan maksud asid.

…………………………………………………………………………………………

(b) Why hydrochloric acid is a strong acid? [1 mark]
Kenapa asid hidroklorik merupakan asid kuat?

…………………………………………………………………………………………

(c) Solutions P and Q have different pH values.
Larutan P dan Q mempunyai nilai pH yang berbeza.

i. Which solution gives a lower pH value? [1 mark]
Larutan yang manakah memberikan nilai pH yang rendah?

…………………………………………………………………………………………

ii. Given one reason for the answer in (c)(i) [1 mark]
Berikan satu sebab bagi jawapan anda di (c )(i)

…………………………………………………………………………………………

(d) 25 cm3 of 0.1 mol dm-3 solution hydroxide solution is put in a conical flask.
Then a few drops of phenolphthalein are added.
This solution is titrated with solution P.
25 cm3 larutan natrium hidroksida 0.1 mol dm-3 dimasukkan kedalam kelalng kon.
Kemudian beberapa titis fenolfthalein ditambah.
Larutan tersebut dititratkan dengan larutan P.

i. State the type of reaction between sodium hydroxide solution

and solution P.

Nyatakan jenis tindak balas antara larutan natrium hidroksida dan

larutan P. [1 mark]

…………………………………………………………………………………………

ii. What is the colour change of the mixture at the end point? [1 mark]
Apakah perubahan warna campuran pada takat akhir?

…………………………………………………………………………………………

iii. Name one example of solution P and write the chemical equation
for the reaction.

Namakan satu contoh larutan P dan tulis persamaan kimia bagi tindak balas

tersebut. [3 marks]

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iv. Calculate the volume of solution P used given in (d)(iii).

Hitung isipadu larutan P yang diberikan di (d)(iii) [2 marks]

QUESTION 18/SOALAN 18

(a) Diagram below shows the apparatus set-up for the titration of 25.0 cm3 of
0.1 mol dm-3 sodium hydroxide, NaOH solution with dilute hydrochloric acid, HCI,
using phenolphthalein as an indicator.
Rajah dibawah menunjukkan susunan radas bagi pentitratan 25.0 cm 3 larutan natrium
hidroksida 0.1 mol dm -3 , NaOH yang dicairkan dengan asid hidroklorik, HCl menggunakan
fenophthelain sebagai penunjuk.

Dilute hydrochloric acid/
Asid hidroklorik cair

25.0 cm 3 sodium hydroxide solution
+ phenolphthalein
25.0 cm 3 larutan natrium hdiroksida
+ fenolphthalein

i. Name the type of reaction that occurs in the conical flask.

Namakan jenis tindak balas yang berlaku didalam kelalang kon. [1 mark]

…………………………………………………………………………………………

ii. Write a balanced chemical equation for the reaction in (a)(i)
Tulis persamaan kimia yang seimbang bagi tindak balas tersebut. [2 marks]

…………………………………………………………………………………………

iii. State the colour change of the solution in the conical flask

when the end point of titration is reached.

Nyatakan perubahan warna bagi larutan dalam kelalng kon apabila

Takat akhir pentitratan telah tercapai. [1 mark]

…………………………………………………………………………………………

iv. 20.0 cm3 of hydrochloric acid is needed to neutralise completely

the sodium hydroxide solution in the conical flask.

Calculate the molarity of the hydrochloric acid.

20.0 cm 3 asid hidroklorik diperlukan untuk meneutralkan lengkap larutan natrium

hidroksida dalam kelalng kon.

Hitung kemolaran asid hidroklorik [2 marks]

…………………………………………………………………………………………

(b) Table below shows the concentration and volume of two different types of strong acid, X and
Y, which are used to neutralise 20.0 cm3 of 0.5 mol dm-3 potassium hydroxide solution.

Jadual dibawah menunjukkan kepekatan larutan dan isipadu bagi dua jenis asid kuat, X dan
Y, yang mana telah digunakan untuk meneutralkan 20.0 cm 3 larutan natrium hidroksida
0.5 mol dm -3.

Acid/ Asid X Y
0.5 mol dm-3 0.5 mol dm-3
Concentration /
kepekatan V cm3 2V cm3

Volume/ isipadu

Based on the information in Table above, identify acid X and acid Y.
Berdasarkan kepada maklumat dalam Jadual diatas, kenal pasti asid X dan asid Y.

[2 marks]

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(c ) Sulphuric acid solution contains sulphate ion, SO42-.
Describe one confirmatory test for sulphate ion, SO42-.
Larutan asid sulfuric mengandungi ion sulfat, SO42-.
Huraikan satu ujian pengesahan untuk ion sulfat, SO42-.

[3 marks]

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