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-Paper Reference7 o 8 1 / o

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ationsGeE

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Chemistry I I I I

Ordinary Level !uestion Lea"e

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Paper 1Tuesday

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Time*

1 +our

1,

minutes

um.er /lan0

1

&

,

aterials re2uired for examination

-il

3tems included 4it+ 2uestion papers

il 5

7

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Answer ALL questions.

1. 6omplete t+e follo4ing ta.le gi"ing t+e name or t+e formula of eac+ compound as

appropriate8

Chemical name Chemical formula

(a) .arium oxide

(.) S$

(c) 9 6$&

(d) et+ene

Lea"e

.lan0

(e) :e$&

(Total 5 marks

n(f) aluminium sulp+ate !l

". (a) ;sing t+e Periodic Ta.le pro"ided complete t+e follo4ing ta.le8

arne of elementAtomic

num#er$lectronic confi%uration

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&8 :rom t+e follo4ing list of non-metallic elements

argon .romine iodine

oxygen p+osp+orus sulp+ur

select an element t+at*

(a) is in t+e same group of t+e Periodic Ta.le as nitrogen

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

(1)

Lea"e

-.lan0

(.) is a solid at room temperature and su.limes on +eating

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

(1)

(c) reacts 4it+ +ydrogen to form a compound 4+ic+ is a li2uid at room temperature

888888888888 ~88888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888 " ."8888888888888888888888888888888888888888888888888888888888888888

(1)

(d) exists as molecules containing eig+t atoms (

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.........w

.......w

.......w

...........X.....t...r.....e.....m......e.....P....a.....p.

...e.....r.....s.......n......e....t..................(1)

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Xt P t

-&. :ill in t+e missing colours for eac+ of t+e follo4ing8

(a) = fe4 drops of distilled 4ater are added to an+ydrous co.alt c+loride paper8

6olour c+anges from to pin08

(.) Solid copper(33) car.onate is +eated strongly8

6olour c+anges from green to 8

(1)

(1)

Lea"e

.lan0

(c) Sulp+ur dioxide gas 3S .u..led t+roug+ acidified potassium dic+romate(>3)

solution8

6olour c+anges from orange to 8

(1)

'(otal ) marks n!&

*. ?+ic+ of t+e follo4ing .est descri.es eac+ of t+e reactions represented .y t+e e2uations

.elo4@

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Xt P t

o+idation reduction

redo+ not o+idation or reduction

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,. ?rite do4n t+e*

(a) num.er of atoms in one molecule of 6A&6BB6A&

.l

(1)

(.) num.er of moles of car.on dioxide formed .y t+e complete com.ustion of one mole

of propane 6&AS

(1)

(c) num.er of moles of ions in one mole of .arium nitrate /a($&+

(1)

(d) num.er of faradays of electrical c+arge needed to con"ert one mole of %nCDions to %n

metal

(1)

(e) relati"e formula mass of urea AC6BAC
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7. (a) i"e t+e sym.ol of*

(i) an anion t+at +as t+e same electron configuration as a c+loride ion

'-...../

Lea"e.lan0

(1)

(ii) a cation t+at +as t+e same electron configuration as a c+loride ion8

(1)

(.) Fra4 a dot-and-cross diagram to s+o4 t+e .onding in a molecule

oftetrac+loromet+ane 66318

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8 i"e t+e names or formulae of t4o c+emicals t+at 4ould .e used in t+e la.oratory to ma0e

eac+ of t+e follo4ing gases8 State a simple test 4it+ a result t+at could .e used to identify

eac+ gas8

(a) Bxygen

ames or formulae of t+e t4o c+emicals

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

Test and result 8

()

(.) Aydrogen

ames or formulae of t+e t4o c+emicals

Test and result 8

L

.l

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- G8 T+e grap+ .elo4 s+o4s +o4 t+e solu.ility of copper(33) sulp+ate c+anges 4it+temperature8

Solu.ility H

g per 1$$ g 4ater

Lea"e.lan0

5$, I

,$-1 8I ,

, ,

,

&$ -I-+'+++A-DDD-A--A-A-D-DDDD-D-DDDDDDDDDD-A m--DD-D-D-AI J 8mm

$

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(c) &$ g of copper(33) sulp+ate are dissol"ed III 1$$ g of 4ater at $K6 and t+e solution

is allo4ed to cool8 =t 4+at temperature 4ill crystals first appear@

8888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888 K6

(1)

(d) T+e solution in part (c) could .e cooled slo4ly or 2uic0ly8 Suggest +o4 eac+ of t+e

follo4ing 4ould .e affected .y t+e rate of cooling if at all8

(i) T+e temperature at 4+ic+ crystals appear

.l

(1)

(ii) T+e siCe of t+e crystals

(1)

'(otal * marks n!-

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10. T+e follo4ing is a list of anions8

:rom t+is list gi"e t+e formula of an anion 4+ic+*

(a) +as a relati"e formula mass of 51 8

(1)

(.) is present in all al0alis 8

(1)

(c) forms a copper(33) compound t+at mig+t .e a .lue or 4+ite solid 8

(1)

(d) forms an off-4+ite or cream insolu.le compound 4it+ =g'(a2) 8(1)

(e) forms solu.le salts 4it+ all metals 8

(1)

Lea"e

.lan0

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pers.net (1)

(Total 5 marks !!

10
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11. T+e follo4ing e2uation represents t+e reaction .et4een Cinc oxide and dilute sulp+uric

acid8

(a) ?+at is t+e relati"e formula mass of Cinc oxide@

Lea"e

-.lan0

(1)

(.) Ao4 many moles of sulp+uric acid are needed to react 4it+ 8$, g of Cinc oxide@

(1)

(c) ?+at "olume of mol dm-& sulp+uric acid 4ould .e needed to react 4it+ 8$, g of

Cinc oxide@

'"

(d) ?+at is t+e maximum mass of Cinc sulp+ate (%nS$) 4+ic+ could .e formed from

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8$, g of Cinc oxide@

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-~--------------------~~'Lea"e

.lan0

/L=9 P=E

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1". 3ron is extracted from its ore +aematite in a .last furnace8

(a) i"e t+e c+emical formula of+aematite8

.

l

'1

(.) ?+ic+ gas is responsi.le for reducing t+e +aematite to iron@

'1

(c) ?+ic+ is t+e main reaction t+at raises t+e temperature in t+e .last furnace@

'1

(d) (i) ?+at is t+e main impurity in t+e iron ore used in t+e .last furnace@

'1

(ii) Explain +o4 t+is is remo"ed gi"ing appropriate c+emical e2uations8

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(6) T+e follo4ing e2uation represents t+e complete com.ustion of met+ane in air8

CH1 + 20( CO( + 2H(O

;se t+e information in t+e follo4ing ta.le to calculate t+e ent+alpy c+ange Sl],

resulting from t+e complete com.ustion of one mole of met+ane8

.l

/ond

C-H

/ond energy

mole of .

+413

H 0M per

nds

0=0 +496

C=O +805

O-H +463

(i) /onds .ro0en

/ond .ro0en um.er of .onds Energy re2uired H 0M

C-H

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'-"

Lea"e.lan0

/L=9 P=E

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1&. (a) = compound consists of 8N car.on 8$N +ydrogen and 7187N c+lorine8

(i) S+o4 t+at t+e empirical formula of t+is compound is 6A6l8

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

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

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

.l

'"

(ii) i"e t+e simplest molecular formula for t+is compound8

(1)

(iii) 6alculate t+e relati"e molecular mass of a compound 4it+ t+is molecular

formula8

(1)

(.) (i) Fra4 t+e displayed formulae of t4o different compounds 4it+ molecular formula

6A/r8

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1*. T+e electrolysis of mol m@ copper(33) sulp+ate solution using pure copper electrodes

4as carried out using t+e follo4ing apparatus8

~----~-------4.~-------------'

JLea"e

.lan0

anode -----#_ -D----------- cat+ode

-t----- copper(33) sulp+ate

solution

~~-------------------~
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T+e masses of t+e

welec

wtrod

wes a

.t

Xt+

te

rsta

ert

mof

t+ee Peleactrpolyesisr4se.ren* et

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(c) =t t+e end of t+e electrolysis t+e mass of t+e cat+ode 4as G857, g8

(i) ?+at 4as t+e gain in mass of t+e cat+ode@

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

(ii) ?+at 4as t+e final mass of t+e anode@

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

(1)

(1)

.l

(iii) Ao4 many coulom.s of c+arge 4ere needed to deposit t+e copper on t+e

cat+ode 8

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

()

(i") T+e electrolysis 4as carried out for 5 minutes and 5 seconds8 6alculate t+e

current used8

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7081-01Chemistry