The structure of the atom-intervensi.doc

7/30/2019 The structure of the atom-intervensi.doc

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Prepared By: Mr.Iwin

Chemistry Form 4

Chapter 2 (Structure of An Atom)

1. books electricity water chair

Light air pens

a) Matter is anything that has volume and weight, from the words in the box above,choose the correct example of matter and write the answer in the space given.

Example of matter : 1) .

2) .

3) .4) .

5) . (5 marks)

b) (i) Elementary particles that make up matter may be an atom, molecule or ion. Fill

in the blanks with the correct answer.

a) An atom is the ...particles of an element that can participate in a

chemical reaction.

b) A molecule is a group of ..which are chemically bonded

together.

c) An ion is a a positively charged or . charged particle.(6 marks)

(ii) Underline the correct answer with the correct specification:-

a) NaCl ( atom , molecule , ion )

b) Cu ( atom , molecule , ion )c) O2- ( atom , molecule , ion ) (3 marks)

d) Evidence movement of particles is diffusion. Diffusion is a randommovement of particles from a region of ( high, low ) concentration to a

region ( high, low ) concentration. (2 marks)

c) (i) 3 states of matter, there are :-

______________ _____________ _____________

(3 marks)


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Chemistry Form 4


(ii) Fill in the blanks with the word in the box below.

Far apart difficult very weak very closelyMedium very strong low disorderly

Easily strong high

(11 marks)T

(iii) P Q

SOLID LIQUID GASR S

Name the following process correctly :

a) P : ______________processb) Q : ______________process

c) R : ______________process

d) S : ______________processe) T : ______________process

( 10 marks )

States Solid Liquid Gas

Arrangement of

particles

Particles are orderly and.packed

together.

Particles are closely but........ packed together.

Particles are in

random arrangement.

Forces of

attraction

betweenparticles

..

forces.

.. forces but

weaker than in solid.

forces.

Density .. .

Compressibility Not compressible .to

compress.

compressed.


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Chemistry Form 4


(d) Temperature(C )

K

boiling L Mpoint

freezing N O

point

P

Time(min) The cooling curve of naphthalene

Based on the figure above, circle the correct answer.

Section of the cooling curve physical state1) At point K (Gas ; Liquid )

2) Between points K and L (Solid ; Gas )

3) At point L ( Gas + liquid ; Liquid + solid )

(Condensation starts)

4) Between points L and M ( Gas + liquid ; Liquid + solid )

5) At point M ( Solid ; Liquid )

(Condensation is completed)

6) From point M to N ( Solid ; Liquid )

7) At point N ( Gas + liquid ; Liquid + solid )

( Freezing starts)

8) Between points N and O ( Gas + liquid ; Liquid + solid )

9) At point O ( Solid ; Liquid )( Freezing is complete )

10) Between points Q and P ( Solid ; Liquid )

( 10 marks)


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Chemistry Form 4


(e) Temperature (C )

F

Boiling D Epoint

B C

Melting

point

A

The heating curve of naphthalene Time (min)

Based on the figure above, circle the correct answer.

Section of the cooling curve physical state

1) At point A ( Solid ; Liquid )

2) Between points A and B ( Solid ; Liquid )

3) At point B (Solid + Liquid ; Solid + Gas )

( melting starts )

4) Between points B and C (Solid + Liquid ; Solid + Gas )

5) At point C ( Solid ; Liquid )( melting is completed )

6) From points C to D ( Solid ; Liquid )

7) At point D (Solid + Liquid ; Liquid + Gas )

( Boiling starts )

8) Between points D and E (Solid + Liquid ; Liquid + Gas )

9) At point E ( Solid ; Gas )( boiling is completed )

10) Between points E and F ( Solid ; Gas )

( 10 marks )


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Chemistry Form 4


2. Underline and match the word with the correct discovery of each scientist.

J. J .Thomson Discover of neutronErnest Rutherford Discover of electron

James Chadwick Discover of proton

( 3 marks )

3. (i) An atom is made up of protons, neutrons and electrons. Complete following table.

Sub-atomic

particles

Symbol Position Charge

Proton p Nucleus

Neutron n None

Electron shell Negative

A

X Symbol of elementz

(ii) The symbol form above shows the standard representation for an atom. State

what is represented by A and Z.

A : _______________numberB : _______________number

(iii) What is the relationship of nucleon number & proton number of anatom?

Nucleon number = _________________ + ____________________( 7 marks )

(iv) Complete the following table

Element Symbol Symbolform

Proton Nucleon Neutron

Calcium Ca 40Ca

20

20 40

Silver Ag 108

Ag

47

47 61

Potassium K 19 29 20

Mg 24Mg

12

12 24 12

Lead 207Pb

82

82 207 125

( 5 marks )


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4. a)Underline the correct answer.

(i) Isotopes are atoms of the same ( element ; electron ) with different numbers of( neutrons , proton ).

(ii) Isotopes for certain elements have ( similar ; different ) chemical properties buthave ( different ; similar ) physical properties.

(iii) The electrons in the outermost occupied shell are known as the

( 5 marks )

b) Table above shows the proton and nucleon numbers. Determine the isotopes pair.Answer : The isotopes pair are ( 2 marks )

5. Fill in the blanks with the correct words.

a) (i)The way electrons are arranged in an atom is called as ..(ii) The first shell is the one nearest to the nucleus. It can hold a maximum of

.electrons.

(iii) The second shell can hold a maximum of ..electrons.

( 3 marks )b) Complete the table below.

( 20 marks )

ELEMENT PROTON NUM NUCLEON NUM

P 6 12

Q 7 14

R 6 13

S 8 16

Element Proton num Electron arrangement and

circle the valence electron

Atomic structure

Carbon 6

Chlorine2.8.7

Magnesium

12

Beryllium 2.2

Calcium 20

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