Exam chemistry Form 4 paper 2

8/18/2019 Exam chemistry Form 4 paper 2

1/8

NAME : ____________________________________ CLASS : ______

SEKOLAH MENENGAH KEBANGSAAN SULTAN BADLISHAH

09000 KULIM, KEDAH

OCT

4541/2 FINALTERM EXAMINATION

Chemistry FORM FOUR 2012

2 1/2 hours

CHEMISTRY

FORM 4

Two hours and thirty minutes

DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO

1 This !uestion "a"er #onsists o$ three se#tions: Se#tion A%

Se#tion & and Se#tion C

2 Answer all !uestions in Se#tion A 'rite your answers $or Se#tion

A in the s"a#es

"ro(ided in the !uestion "a"er

) Answer any !" !uestion $rom Se#tion & and any !" !uestion

$rom Se#tion C

'rite your answers $or Se#tion & and C on the e*amination

sheets "ro(ided

4 +ou may use e!uations% dia,rams% ta-.es% ,ra"h and other suita-.e

methods to e*".ain your answer

5 The dia,rams in the !uestions are not drawn to s#a.e un.ess

stated

Mar0s a..o#ated $or ea#h !uestion or "art !uestion are shown in -ra#0ets

Show your wor0in, t may he." you to ,et mar0s

3 $ you wish to #an#e. any answer% neat.y #ross out the answer that you ha(e done

Then write down the new answer

The eriodi# Ta-.e o$ E.ements is "ro(ided

16+ou may use a non7"ro,ramma-.e s#ienti$i# #a.#u.ator

11 +ou are ad(ised to s"end 6 minutes to answer !uestions in Se#tion A% )6 minutes $or Se#tion & and )6 minutes

$or Se#tion C

12 8and in this !uestion "a"er and the e*amination sheets at the end o$ the e*amination

PREPARED BY# CHECKED BY# APPRO$ED BY#

E*aminer9s Code

Pa%& uestion

;u..

mar0s

Mar0s

are

re#orded

A

1 16

2 16

) 16

4 16

5 16

16

B 263 26

C

26

16 26

TOTAL


2/8

''''''''''( ''''''''''(( ''''''''

This question paper consists of __ printed pages.

SECTION A[60 marks]

Answer all questions in this section.

1. Diagram shows the heating curve of solid Y at room conditions.

(a (i !hat is the melting "oint of su#stance Y$

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(ii !hat is the "h&sical state of su#stance Y from ' to $

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(iii )*"lain wh& there is no change in tem"erature from ' to $

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% [+ marks]

(iv Draw the arrangement of "articles in Y from to ,$


3/8

[1mark]

(# a#le shows the "roton num#er and nucleon num#er of elements A- D- ) and .

)lement /roton num#er ucleon num#er

A 6 1+

D 16

) 12

13 41

(i !hat is the meaning of nucleon num#er$

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(ii !hich atoms are isoto"es$

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(iii )*"lain &our answer in (# (ii

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(iv !rite the electron arrangement of atom A.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(v Draw the electron arrangement of atom .

[1mark]

+. Diagram shows the "osition of seven elements A- D- )- - 5- and 7 in the "eriodic ta#le.

hese are not the actual s&m#ol of the elements.


4/8

8& using the s&m#ols in diagram 4- answer the following questions9

(a 'tate three elements that are metals.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(# !hich element forms coloured com"ounds when reacted with other elements.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(c !hen a small "iece of element is "ut into water- an alkaline solution is formed and

h&drogen gas is released.

(i !rite the chemical equation for the a#ove reaction.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(ii 'tate one "recaution that must #e taken while carr&ing out the e*"eriment using element

. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(d )lement has man& a""lications in dail& life. 'tate one.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(e )lement 5 reacts with element D to form a com"ound.

(i !rite chemical formula for this com"ound.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark] (ii Draw the diagram of the electron arrangement for the com"ound that is formed #etween

element 5 and D.

[+ marks]

(f )lement A can com#ine with element ) to form a com"ound. (i !hat is the t&"e of com"ound formed$

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark]

(ii 'tate one "h&sical "ro"ert& of the com"ound.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


5/8

[1mark]

4. he diagram #elow shows the arrangement of a""aratus used to "re"are h&drogen chloride in

meth&l #en:ene and in water res"ectivel&.

(a !hat is the "ur"ose of using filter funnels in this e*"eriment $ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark]

(# (i !hat is o#served when a "iece of magnesium ri##on is "laced in 8eaker A and 8eaker 8res"ectivel&.

8eaker A 9 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 8eaker 8 9 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[+ marks]

(ii 'tate the reason for &our answer in #(i %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark]


6/8

(c ame the t&"es of "articles "resent in

8eaker A 9 %%%%%%%%%%%%%%%%%%%%% 8eaker 8 9%%%%%%%%%%%%%%%%%%%% [+ marks](d !ater is added to the solution in 8eaker A and the mi*ture is then shaken. !hen sodium

;ar#onate solution is added- effervescence occurs.

(i ame the gas and suggest a suita#le test to identif& the gas evolved. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% [+ marks]

(ii 'tate the role of water that caused the li#eration of the gas. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1mark](iii !rite the ionic equation for the reaction involving the li#eration of the gas.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark]


7/8

(iii !rite a half equation for the reaction that takes "lace at electrode X . %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark](d (i ame gas Q collected in the test tu#e.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark](ii 'tate a chemical test to confirm &our answer to (d(i. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark](iii !rite a half equation for the reaction that takes "lace at electrode Y .

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark]

(e !hat difference will it make if the e*"eriment is re"eated #& using + mol dm=4of sodiumchloride solution$ )*"lain &our answer.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[+ marks]

3. (a Diagram #elow shows a series of tests "erformed on a colourless solution which contains

one cation and two anions.

Test 2

(i 8ased on the o#servation in the diagram- com"lete the ta#le #elow with a""ro"riate

inferences.est >nference

1

+

4

[4 marks]

(ii !rite the ionic equation for the reaction in est 4.

Test 3

+ HNO3(aq), AgNO3

Test 1

+ NaOH (aq), then

8rown ring formed

?a"our "roduced turns dam"

red litmus "a"er to #lue

;olourless 'olution

!hite "reci"itate formed.


8/8

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark]

(# A student wants to "re"are a "ure sam"le of cr&stalline :inc sul"hate #& reacting dilute

sul"huric acid with su#stance @.

(i ame the su#stance @. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark]

(ii !rite an equation for the a#ove reaction.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[1 mark]

(iii ;alculate the ma*imum mass of :inc sul"hate that can #e "re"ared if 30.0cm4 of

0.+moldm=4 sul"huric acid is reacted with e*cess @.

[ he relative formula mass of :inc sul"hate 161]

[4

marks]

Documents

Exam chemistry Form 4 paper 2