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SMK ST. PAUL, SEREMBAN

FORM 4 CHEMISTRY TEST 1 (2011)

Time:1 hour

NAME : _______________________________________ CLASS :________________

INSTRUCTION: ANSWER ALL THE QUESTIONS IN SECTION A AND B.

A) Multiple-choice Questions (30%)

1 Diagram 1 shows the change of the state of matter..

Process Q

Diagram 1

Which of the following is process Q?

A Boiling

B Sublimation

C Freezing

D Melting

2 The following statement is about an atom.

The mass of an atom is concentrated in the nucleus which

contains positively charged particles.

Which of the following scientists made the statement?

A J.J. Thomson

B Neils Bohr

C Ernest Rutherford

D James Chadwick

3 Which of the following substances consist of atoms?

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AX

H H

A Lead

B Oxygen gas

C Lead(II) iodide

D Naphthalene

4. You are given this formula:

X =

What is X ?

Number of Particles

Avogadro Cons tan t

A Molar mass

B Molar volumeC Number of moles

5 Molar mass of a substance is the mass

A of one mole of the substance

B of one atom of the substance

C of 6.023 x 1024

particles of the substance

6 The diagram shows the symbol of an atom.

Nucleon number

Proton number Z

The isotopes of hydrogen are 1 , 21 1

What is isotopes?

A Different atoms with the same number ofelectron, protons and neutrons.

B Different atoms with the same number of

electrons but different number of protons.C Different atoms with the same number of

neutrons but different number of protons.

D Different atoms with the same number of

protons but different number of neutrons.

and 3 .1

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7. The value of Avogadro constant is 6.023 x 1023

mol-1

What is Avogadro constant?A The number of neutrons in an atom.

B The mass in one mole of a substanceC The number of protons and electrons of an atom.D The number of particles in one mole of a substance

8. An amount of substance that contains as many particles as the number of atoms inexactly 12 g of carbon-12

Which of the following terms explains the above statement?

A mole

B molar massC relative atomic massD relative molecular mass

9. The equation below shows the reaction between magnesium and oxygen

2 Mg (s) + O2 (g) 2 MgO(s)

Number 2 represents

A massB volume

C number of moles

D number of particles

10. Which of the following statements is true about matter?

A Matter has mass only.

B Matter has mass and occupies space.

C Matter is the smallest particle of an element.

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11. Which of the following is not true about molar mass?

A the mass of 6.02 x 1023

particles

B the mass of NA number of particles

C the mass of one mole of the substancesD the mass of one gram of the substances

12. An atom is a neutral particle. It contains the same number of

A protons and neutrons.

B protons and electrons.

C neutrons and electrons.

13. The diagram shows the heating curve of solid naphthalene.

temperature/oC

S

QR

Ptime/min

Which of the following points shows the melting process of naphthalene?

A At point PB From point P to point Q

C From point Q to point R

D From point R to point S

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14. The diagram shows the electron arrangement of atom X

X

How many valence electrons are there in the atom X?

A 2B 5C 7

15. The table shows the relative masses of the three subatomic particles.

Subatomic Relative mass

Proton 1

Electron 1

1840

Neutron 1

Which of the subatomic particles has the least mass?

A Proton

B NeutronC Electron

16. What is the number of molecules in one mole of carbon dioxide gas,

CO2[Avogadro constant;6.02x1023 mol-1]

A 6.02x1023

2B 1x 6.02x1023

C 2x 6.02x1023

D 3x 6.02x1023

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Na

17. The number of electrons and the number of neutrons of atom X are 4 and 5

respectively.

What is the proton number and nucleon number of atom X?

Protonnumber

Nucleon

numberA 4 9

B 4 5

C 9 4D 1 9

18. The table shows the relative atomic masses of copper and oxygen.

Elements Copper OxygenRelative atomic mass 64 16

How many times is copper atom heavier than oxygen atom?

A 0.25B 4C 48

D 80

2319. The symbol of sodium atom can be written as 11

The nucleus of this sodium atom

contains

A. 11 protons and 12 neutrons

B. 11 neutrons and 12 protonsC. 11 protons and 12 electrons

D. 12 neutrons and 11 electrons

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20. The table below shows the proton number and the number of electrons of four differentparticles.

Particle Proton number Number of electrons

P 8 8

Q 12 10

R 17 17

S 17 18

Which of the particles are ions?

A P and QB P and R

C Q and R

D Q and S

21. The table below shows the number of protons of four atoms W, X, Y and Z.

Atom Number of protons

W 3

X 16

Y 17

Z 19

Which of the atoms have the same number of valence electrons?

A W and Z

B X and Z

C X and Y

D Y and Z22. The following shows the relative formula mass of several compounds. Which is not true?

Compound Relative formula mass

A CO2 44

B NH3 15

C K2O 94D MgO 40

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21. The table below shows the number of protons of four atoms W, X, Y and Z.

Atom Number of protons

W 3

X 16

Y 17

Z 19

Which of the atoms have the same number of valence electrons?

A W and Z

B X and Z

C X and Y

D Y and Z22. The following shows the relative formula mass of several compounds. Which is not true?

Compound Relative formula mass

A CO2 44

B NH3 15

C K2O 94

D MgO 40

23. The relative atomic mass of chlorine is 35.Thus, chlorine has a

A Molar mass of 35 g

B Relative molecular mass of 35 g

C Relative formula mass of 71

D The number of mole 35

24. The relative molecular mass of substance XY2 is 64. If the relative atomic mass of anelement of atom X is 32, calculate the relative atomic mass of an atom of element Y.

A 8

B 16

C 32D 64

25. What is the number of moles of zinc chloride,ZnCl2, in 34.0 g of zinc chloride?[Relative atomic mass:Cl,35.5;Zn,65]

A 0.25 mol

B 0.34 mol

C 0.52 mol

D 2.50 mol

26. Calculate the number of oxygen atoms in 5 mol of sulphur trioxide,SO3 gas?

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[Avogadro constant;6.02x1023 mol-1]

A 1.204x1023

B 9.03x1024

C 3.612x1024

D 4.816x1024

27. Given 4.214x1021 chlorine atoms, calculate the number of moles of chlorines molecule.[Avogadro constant;6.02x1023 mol-1]

A 0.35

B 0.7

C 0.0035

D 0.007

28. Calculate the mass of 2 mol of silver chloride,AgCl.[Relative atomic mass:Ag,108:Cl,35.5]

A 143.5 gB 145.5 g

C 287 g

D 574 g

29. Calculate the mass of 9.03x1021 chlorine molecules.[Relative atomic mass:Cl,35.5;Avogadro constant:6.02x1023 mol-1]

A 1.065 g

B 1.5 g

C 2.13 g

D 3.0 g

30.Calculate the number of moles of 16 g of Copper.

[ Relative atomic mass : Cu , 64 ]

A 0.25

B 0.75

C 2.50

D 7.50

25. given 56.35 g of zinc sulphate,ZnSO4,calculate the number of the zinc sulphate.

A 0.45

B 0.41

C 0.39

D 0.35