ujian bulan mac f4 2016

8/18/2019 Ujian Bulan Mac f4 2016

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SECTION A (30 marks)

Each question is followed by four option A, B, C and D. For each question, choose only one correct answer.

Circle your answer on the answer sheet given.

1. hich of the following state!ents is true about che!istry"A. Che!istry is a study of roc#s

B. Che!istry is a study of !atter C. Che!istry is a study of living things

D. Che!istry is a study of natural forces and energy

$. hich of the following careers requires #nowledge in che!istry"

%. &har!acist %%%. Che!ist

%%. 'awyer %( Architect

A. % and %% C. % and %%%

B. %% and %( D. %%% and %(

). hat is the first step in scientific !ethod"

A. Collecting data

B. *a#ing inferenceC. *a#ing hypothesis

D. *a#ing observation

+. hich of the following substances is !ade up of ato!s"A. %ron

B. ater

C. itrogen

D. -odiu! Chloride

. hich substance is an ionic co!pound"

A. Ethanol, C$/)0/

B. -ulphur dioide, -0$C. *agnesiu! oide, *g0

D. 2etrachloro!ethane, CCl+

3. hich of the following processes, proved the #inetic theory of !atter"

A. Diffusion

B. 4espiration

C. eutralisation

D. &hotosynthesis

5. 2he diagra! 1 shows the changes of states of !atter

Diagra! 1

hich of the following is the process 6"

A. *elting C. Free7ing

B. Boiling D. Condensation

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1). Diagra! + shows the heating curve of solid 4

Diagra! +

hich of the following state!ent is true"

A. 2he !elting point of 4 is

B. At ', substance 4 eists as liquid only

C. 2he process that occurs at 0 is free7ing

D. At , energy is used to brea# up the bond between particles.

1+. hich of the following scientist discovered proton"

A. eils Bohr C. =a!es Chadwic#

B. =. = 2ho!son D. Ernest 4utherford

1. hich of the following state!ents is true about ato!ic !odel proposed by Ernest 4utherford"A. 2he electrons in an ato! !ove in shells around the nucleus which contains proton

B. 2he ato! was described as a sphere of positive charge e!bedded with electron

C. 2he nucleus of the ato! contains proton and neutrons

D. 2he nucleus of the ato! contains proton

13. hat are the sy!bols of the ele!ents of berylliu!, boron, sodiu! and potassiu!"

Berlli$m Boron So&i$m 'otassi$m

A B Br - &

B Be B a >

C B Br a &

D Be B - >

15. Ato! of carbon:13 has 3 electrons. /ow !any neutrons does an ato! carbon:13 contains"

A. 3 C.13

B. 19 D. $3

18. Ato! 6 has a nu!ber of neutrons 1$ and nucleon nu!ber $) . hich of the following sy!bols is forato! 6"

A

X 1223

B

X 2312

C

X 2311

X 1123

4

2i!e ?!in@


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1;. Diagra! shows the ato!ic representation of an ato!

Al1327

Diagra!

u!ber $5 refers to

A. ato!ic nu!ber B. nucleon nu!ber

C. nu!ber of proton

D. nu!ber of neutron

$9. 2he infor!ation shows the sub:ato!ic particles of ato!

Electron configuration $.1

u!ber of protons )

u!ber of neutrons +

hich of the following diagra!s shows an ato!

A B

C D

$1. 2he following shows a standard representation of !agnesiu! ato!, *g.

Mg1224

hich is the correct electron arrange!ent for !agnesiu!"

A. $.8.8.3 C. $.8.8.$

B. $.8.3 D. $.8.$

$$. 2he proton nu!ber of potassiu! ato! is 1; and its !olar !ass is ); g!ol:1. hat is relative ato!ic !ass

of sodiu! ato!"

A. 1; C. );

B. $9 D. 8

$). 2he relative for!ula !ass hydrated 6 carbonate 6$C0).19/$0 is $83. hat is the relative ato!ic !ass of

ele!ent 6"4elative ato!ic !ass /,1 C,1$ 0,13

A. $) C. 1$9

B. +3 D. $+9

$+. 2he !ass of three ato!s of ele!ent 6 is equal to the !ass of four carbon ato!s. 6 is not the actual

sy!bol of the ele!ent. hat is the relative ato!ic !ass of ele!ent 6"

4elative ato!ic !ass C,1$

A. +8 C. 13

5

3p+4 3p+4

3p+3 3p+3


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B. )3 D. 1$

$. hich of the following state!ents is true for one !ol of a substance"

A. 1 !ol of oygen gas contain 3.9$19$) ato!s

B. 1 !ol of copper contains 3.9$19$) !olecules

C. 1 !ol of water contains the sa!e nu!ber of ato!s as in 1$g of carbon:1$D. 1 !ol of carbon dioide contains the sa!e nu!ber of !olecules as the nu!ber of ato!s in 1$g of

carbon:1$

$3. 2he diagra! 3 shows three balloons with hydrogen, nitrogen, and oygen gas respectively.

Diagra! 3

Arrange the gases in an ascending order of volu!e.

4elative Ato!ic !ass /,1 ,1+ 0,13 1 !ol of gas occupies $+ d!) at roo! te!perature and pressure

A. hydrogen, nitrogen, oygen

B. hydrogen, oygen, nitrogen

C. nitrogen, oygen, hydrogen

D. oygen, nitrogen, hydrogen

$5. %f the Avogadro nu!ber is represented by the letter x, what is the nu!ber of hydrogen gas particles, /$,

with the !olar volu!e of $+ d!) !ol:1 at roo! te!perature and pressure"

A. x C. x$

B. $ x D. 1$ x

$8. 2he diagra! 5 shows a water disposal site. 2he activity of !icroorganis!s in the waste produce !ethane

gas, C/+

Diagra! 5

hat is the !ass of !ethane gas produced" 4elative ato!ic !ass /,1 C,1$ 1 !ol of gas occupies $+ d!) at roo! te!perature and pressure

A. 1$g C. $1g

B. 13g D. $5g

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$;. hich co!pound has the correct for!ula"

Compo$n& orm$la

A Bariu! nitrate Ba?0)@$B 'ead ?%%@ oide &b0$C Copper ?%%@ oide Cu$0

D -ilver carbonate AgC0)

)9. hich che!ical equation is correctly balanced"A. > 0$ > $0

B. > Cl$ >Cl

C. Gn /Cl GnCl$ /$D. Gn /$-0+ Gn-0+ /$

A-E4 -/EE2 ?0B=EC2%(E- H


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Diagra! $.1

i. hat is !eant by isotopes" 1*

KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK

KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK

ii. a!e the positively charged subato!ic particles found in the nucleus of an ato!. 1*

KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK

iii. hat is the relative !ass of the particles in ?ii@" 1*


iv. a!e the subato!ic particles which is neutral. 1*


v. rite the sy!bol of one carbon isotopes above in the for! of . $*


$. Diagra! ).1 shows a syringe filled with carbon dioide gas, C0$ at roo! te!perature and pressure.

Diagra! ).1

4elative ato!ic !ass CJ1$, 0J13, *olar volu!e J $+ d!)!ol:1 at roo! te!perature and pressure

?a@ Calculate the nu!ber of !oles of carbon dioide gas in the syringe. 1*

?b@ Calculate

?i@ 2he nu!ber of carbon dioide !olecules in the syringe. 1*

Avogadro constant J 3.9$ 19$) !ol:1

?ii@ 2he nu!ber of ato!s in the syringe 1*Avogadro constant J 3.9$ 19$) !ol:1

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?c@ Diagra! ).$ shows $g of calciu! carbonate, CaC0)4elative ato!ic !ass CJ1$, 0J13, CaJ+9

Diagra! ).$

Calculate

?i@ 2he relative for!ula !ass of calciu! carbonate 1*

?ii@ 2he nu!ber of !oles of calciu! carbonate 1*

?iii@ 2he percentage of oygen by !ass in calciu! carbonate 1*

?iv@ 2he e!pirical for!ula of a co!pound is C/$. %f the relative !olecular !ass of the co!pound is

8+, what is its !olecular for!ula" )*

4elative ato!ic !ass /J1, CJ1$

-ection C ?1 !ar#s@

Answer all the questions in the space provided

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-tep 1 Crucible and lid are

weighed

-tep $ Crucible, lid and

!agnesiu! ribbon are

weighed.

-tep ) !agnesiu!

ribbon is heated until

the reaction is co!plete

-tep + Crucible, lid

and !agnesiu! oide

are weighed when

cooled.

?a@ Co!plete the following table by stating the observations and related inferences in the eperi!ent.

0bservation %nference

i. KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK

KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK


i. KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK



ii KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK



ii. KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK



+ !ar#s

?b@ 4ecord the reading to two deci!al places for

2he !ass of crucible and lid KKKKKKKKKK g

2he !ass of crucible, lid and !agnesiu! ribbon KKKKKKKKKK g

2he !ass of crucible, lid and !agnesiu! oide KKKKKKKKKK g

) !ar#s

?c@ ?i@ hat is the !ass of !agnesiu! that has been used"

1 !ar#

?ii@ hat is the !ass of oygen which reacted with !agnesiu!"

1 !ar#

?iii@ Deter!ine the e!pirical for!ula of !agnesiu! oide

4elative ato!ic !ass *,$+ 0, 13

) !ar#s

?d@ 2he students want to deter!ine the e!pirical for!ula of copper?%%@ oide. /e used the steps and set:

up of the apparatus as the eperi!ent before. &redict whether the e!pirical for!ula of copper ?%%@oide can be deter!ined. Eplain your answer

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KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK



) !ar#s

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

?End of questions paper@

&repared by, Chec#ed by,

IIIIIIIIIIIII IIIIIIIIII..........

?FA2%*A/ /%-/A*AD%4@/ead of Che!istry &anel

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ujian bulan mac f4 2016

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