OLevel Chempractical 02-11 ANS

8/10/2019 OLevel Chempractical 02-11 ANS

1/37

NAME:

{)

DATE:

ASSESSMENT

FOR

TOPIC:

..ENERGY

CHANGES,

Section

A

Multiple

choice

questions

't.

Whicfr

of

the

followingidoes-lat

release

heat energy?

A.

The

mixing

netwdb-n-Oilute

hydrochloric

acid

and

sodium

chloride

solution

B-

The

mixing

between

dihlte

sulphuric

acid

and

water

C,"

The

reaction

between

hydrogen

and

oxygen

to

form

vvater

,76.

me splitting

of

hydrogen

mclecules

into hydrogen

atoms

2-

The

three

equations

are

given

below'

l:

H,

*29

ll:

HCI*H

+ Cl

lll:2H+O*H,O

Which

oI

the

above

equations

represent(s)

endothermic?

A.,

lonlY

,,9.

land

ll

C.

lland

lll

D.

l,ll

and

lll

5,

The following

chemical

reaction

takes

place.

NHJg)

+ HCI(g)

-

NH.CI{s} AH

=

negative

value

Vqfr6n satement

about

the reacticn

is

correct?

,A.

The reaction

causes an

increase in temperature in

the sunoundings.

'/

B.

The reaction

causes

a decrease

in the

temperature

in

the sunoundings-

C. The

reaction

is a bond

breaking

process-

D.

The reaction

is a

physicalchange.

6. Which

of the

following

statements

is

true about an

endothermic

process?

A.

A catalysi

is required

to

initial the

chemical

reaction.

B. Ught

energy

is always absorbed

in the

process-

C.lt

does

not

require an activation

energy to

initiate

the reaction-

/

tne

tatal

energy

content

of

the

producrs is more than

that

of

the

reactants.

t'

7. Which of the

following

descriptions does

not

correctly

describes

an

exothermic

process?

A.

lt is a

bond making

process-

g.

Thetemperafurerndrescnrauadicgshcreeses.

. ,

9. .

total energy content of the

products

is

less than that of the

ptftkcts.

i

-t,

{'tr*l-

.,D-

The

process

does

not

involve

actirration

energy.

,u

(F)

3.

A reaction

between

magnesium

and

dilute

hydrochloric

acid

according

to

fte following

equation'

Mg(s)

+

zHC(aq)

*

Mgc[(aq]

+

H"(g]

AH

=

negative

value

Which

of

the

following

statements

is incorect?

(t)

A-

Magnesium

is oxidised.

B.

Magnesium

ctrloride

has

a high

solubili$

in water'

d

md

1611p1I energy

conter*

ot

tfre n1gCt"

and

H"

is

greater

than

that

of

Mg and

HCI-

'';.

Every

1

mote

oi

magnesium reacts in an excess of

acid

produces 1 mole

of

magnesium

chloride-

4. When

solid

sodium

chloride

is

added

to water,

the

temperature

of

the

water drops-

Which

of

the

folowing

conclusions

best

describes

this observation?

,7*.

tniprocess

is endothermic.

(

Il

)

'

B.

The

process

is

exothermic.

C-

Sodium

chloride

reacts

with

water.

D. lt

is a

bond

forming

Process.

(i)

(>)

{p}


2/37

8.

The

chemical

equations

forthree

changes

are shown

belorry:

CO""..-.-

C +

20

2H'+

O-

ZILA

NH.CI*

NH.'+

Cl

1- Natural

gas

contains

mainly

methane

gas,

GH*

When

metfiane

gas

buns

completely

in

an excess

of

oxygen

gas,

carbon

dioxide

and steam

are

produced.

8Sn

kJ

of

heat

is

given

out

for enrery

mole of

methane

bumt.

CH.(S) +

O,(g)

-+

CO"tg) +

H"O(S)

(a)

Write

the

heat

of

reaction

for

the

rmction.

^H=

-

E'lohJ

(b)

calculale

the heat

eneEy

released

when

o.4g

g

of

methane

is

bumed.

No

rS

-"1

u

J+f

:

ct-(,",Jc' ryul

t,

't

mul

,tr

Ctiq

,

,t

,tk^*,

tJoKJ

,'*'j'1

-

A,tt)lnd/,J

trtU,

it

tt,t

,'p.L-i,.tn-

tt;;')c''1

3'lr'=

A/kl

4

(c)

ls the

reaction

an

6ixothermic

or

an endothermic?

Explain

in

terms

of

bond

breaking

and bond

making.

l:

II:

l[:

Which

of the

ctrange(s)

islare

endothermic?

Arl

,9.

I, Ht

u

c.

lr,lll

D. I,

il,

[l

9-

Fuels

are

substance

uvnjch

give-olf

large

amount

of heat when

hrmt

Whicfr

of

the followirg

statemenb

is nottrue

aboutfuels?

A- The

products

formed fom

the

combustion

of fuels

have a

lorer

energy

content

than

ffi of

fuels-

&

The

bonds

which

are broken

are

weaker

than

the

bonds that

formed

after trre

cornh.stfrrn-

km3:ffitrffiffi#ffi??**pr*e*

t

10'

When

1

g

of

methane gas

is

hrmt

comptrstely,

56

kJ

of energy

is released.

tAfhat

will

be the

amqnt

of

heat

released

if

i

mole

of the

gas

is

hrmt

completely?

A.

56 kl/mol

B-,,1O2

kllmot

il agakJ/rnol /

,,/o.

8960o

kl/mot

c

5

(d)

Draw

energy

profile

for

reaction-

b'n rl-'

ffA'.t.'h'*,

'a*ry

-

[1,kJ

ft*f",',f

*,**


3/37

I

lrsrvl,vtt

q. u

v

rvetr

rBvr w9 r9r

ru rvrrr.

orsqrrr

qwvru[aY

rv r9

gt{ucuvtr

usluvl-

-'t

:-:/_H2..;)

+

-o2(,)

*.tHzo(

,)

aH=-484kJ

(a)

Balance

the cfremicalibquation.

;

(b)

Complete

the

state

symbols

in the equation-

(c)

Describe

the energy

content of

the reactants

and

the

product.

\(-

i-

/

,.,

i-

.'

.1's,

:,1

;1,-ii11 1;;i.t

)

rnlJu'\

(d)

The energy

released

in

bondtdis

1368 kJ.

Determinethe

energy

involved in bond

making

ior 0.5 mol water

molecules.

't1tI

Li

i

L

'i

'*:-i

,\

I

L1:'

/

i

+'t-'

. ,'.}

,,

-

-LtF

?

'?l

1{"

'

: i::

I t''. i

't'

t(-

,,a.

'

-

a,v

tl

"'',

i

..1

I

g.

The

following

information

shows

the heat

of reactign

for different

readions.

;

,

,_.r:

_

,

"

_,

1

FleactionA:

CHo

+ 3Cl.

.*

cH,cl

+ SHCI

LH='327dJ

*

7

-

'a''*

,

-1*,x.i

Reaction

B:

2NaoH

+ H,So.

.*

Na"So,

+ 214,0

aH

=

-114

kJ

'':':

f

Reaction

C:

N,

+

O,

-

2NO(g) AH =

+181

kI

Draw the energy

level diagram,

lFFtt@EP7i'MP+innnQtgy,

for

the lhree

reactions-

r

a)

i

iir'

i,

a

Jl

d,

1---

ii

I

I

{b)

Determine

the aniount

bf

energy

absorbed

when

0.84

g

of

nitrogen

gas

reacted.

\i, r'i l:t,;u, . ;"/. :---;i.-: - .. ''t'

,

I

i

/'

)

I::

,,.-".:; i.,.i.

-.:\':,r'...:ii

'"/',

'"L'j

':

r'-lIi

i.

.'....

,.'

|

--..'-.."

'

t

4. Methane

reacts

with chlorine

gas

according to the following equation:

cHJg)

4cL(s)-ccL($

+ aHCr(s)

Given

the bond energies

ol

the

covatent bonds invofued:

[H

-

CI: 41 2

kjlmol;

C

-

H:

431

kJ/mol; C

-

CI' 338 kJlmol; Cl-

Cl:

242

kJlmoll

(a)

Name the number

and

the

type of bond-forming

in this reaction.

(b)

(c)

Determine the AH for

this

reaction- . ,

,

f^.t

:-....,..

i..,

i

yr

:

)

i:' ':

j

-f

i-i,''rll:

''

-

".,i-

x{-

J(

.i

,

-

>,-li.r++i-f--+1

i

\.-*-J,

i

i

L"

.'..1

+l>

--

-"

'

-

'ij'7

)

:

lr

:

i-.-/t

\

r

-'-i--

J'

r

ls

this reaction

an exothermic or an endothermh?

{;}r

l;"-

i;tltL..

t'.i...('l;,

,l

-f.

r-j

):

-t:'

,

t:. 1

'l

tl'-;

:

"-

'

i,,' i

t,

, i-"

i;rl


4/37

Section

C

Free tspottse

questions

::-

::

],:.,.:.:

i:.

:,

1.

Hydrogen

and

chlorine

react

to brm

trydrogen

cfiloride-

1U

kl

of

heat

energy is released from

anery

1 mole

of trydrogen

and

1

mde

of chlorine

reac.td.

{a)

Write

a balarrced

cfremical

equation, include

the

heat

of

reaction

(AH),

for

fte

reacfion.

{b} {D

What type

of

energy

change

takes

plae

when

bon&

are broken?

(ii)

VYhat

t rye

of energy

change

takes

place

rrhen

bonds

are

lormed?

tii0

Whi,ch

is the larger

energy

cfrange

taking

place,

bond breaking or

bond making, forthe abore

reaction?

Explain

lour

ansrrer.

(c)

Drawthe

ener,y

profib

forile

abole reaction.

{d}

Determine

the

energy

change

when

21-3

g

of drlorine

g:as

reacts eompletely witrr trydrogen.

lat

fr,

r

U)

--+

2qCL

^tl--

-t?vkJ

(h)

U

)

ndo't[ut'nrc

(

il)

'vul'ktmrt'

(

ii,)

Bon,t'

nil'l"r'

7l'-

e*r*

t""k"*L

A'-u4

L*d

-

n^W'

",*ry

llr,"us

,"yo

6mr-

6*,*

(

L)

(d)

N,

,1

*''1

ft*

*1

[^,1

,

O'30 rnol

fTt

"f

'e^c'he"rL

rt

-

]q'30-36rnol

ur>=

7

n

e

1,

ret{4t

/

lt'(-

F1

'-*ff

"

i"L'vd

'

")

(.),

u),il

,e\"ry


5/37

NAME:

()

DATE:

ASSESSMENT

FOR TOPIC:

"REDOX

REACTIONS"

1.

Define

the

following

in

terms

of

electron

loss

or

gain:

(a)

oxidisingagetrt;

-

fr

).u:;?ryx-

4.- .t",i;i;s-'t

t':"nafi^21

-twb;;t,4--' -:'

./,',t'"

ll*-.r':iri'1''

(b)substanceoxidised.-

+

gql2S 7aq,

"^*t

h,'o

,i*l

suc*z'ts

A)

i,

,,

fr

,rqhJ

)

l

2.

Aqueous

hydrogen

peroxide,

HzOz, reacts

with acidified aqueous

potassium

manganate(Vll)

as

follows:

SEzAz(aq)+

2MnOa-

(aq)

+

6H*

(aq)

+ 5O2

(aq)

*

ZMnz*

(aq)

+

SHrO

(l)

(a)

State

the colour

change

you

would see when

potassium

manganate(Vll)

reacts

with

hydrogen

peroxide.

,r4',,",y

o.

),

:.:,-

1L;,.;

(1)

v

(b)

Name

the

acid

usually

usedto

acidiff the

potassium

manganate(Vll;.

"'

.',,,'"--"

/(t)

I

(c)

Based

oo

your

understanding

of

oxidation

numbers, state

and explain

which

substance

hasbeenoxidisedinthisreaction..),.,'..,i

--,,r1

,t'-.-i

\

iftt:.r rr.i,...,(2)

; ... l'


6/37

4(a)

In

each

of

the

following

equations,

give

the

formula

of

the

substance

that

is being

oxidised-

Give

a reason

in

each

case foryour

choice.

(i)4NH3+3o2+2Nz+6Hzo

\ri:'

i

c

5'J

lti

"rc'

ret,t,"4

I

.ri-i

a-:;ry;JiriZ"i*

*v

l_.

rz

Iz(g)+2NaoH(aq))NaCl(aq)+Nuc{of"qlriirofli

J,,,4

lb()

(i)

GivetheoxidationnumberofchrorineinNacr.andNacro.

(1)

2

-lt

(ii)

Sodium

hypochlorite

solution,

(Naclo)

is

an

oxid/sing

agent.

Describe

a

test

for

an

oxidislng

agenl

.,rr,

i

'

e)

i

{-'

,,

I

A

*t

t'("r-]

"-'r

I

'

L-1

:c)

I

I

,-t:rl

d

Ll)z-.

a^,ler;*

l-t

t,

,tr

U*

ct[c*k,

wl,-t;in

1 ]'r't

"

,l*'r,

d",rt

[cb,Q-;s

l-

tl"t,vve'L

/l-

ftw

r,a/h*

,)

^l,n

(

r('

#vn

ltz-

fviy,,

",''

;";Jrr',1


7/37

{a)

Gomplete the following-

{0

oxidarionisthetoss

a

hild,.tY'l

orrn

of orygen.

Ll

t

e+

{ii)

Reductionisthelossof

-0,W-ar*e

3N4

ot

hf"rya

d'5

+

(b)

For

each of the following

reactiong

underline

the substance

being oxidised

and

state the reason.

ti)

Zn

O"

+ 3CO

*

2Zn +

3CO,

CC

iar*rrn',

+)

{ii)

Mg

+

H.SO.

*

MgSOo

+

H,

cno.ttr*-

trt

0

5.

(a)

A

reaction is shown

below-

2NH" + 3Cu0-N, +

3Cu

+ HrO

ldeniify

/1

(D

oiioising

auent

L

r't

L'

tatw:

{ii)

Reducing

agent

Alltt {

la,w


8/37

NAME:

()

DATE:

ASSESSMENT

FOR

TOPIC:,,QUALITATIVE

ANALYSIS,,

Section

A

Multiple

choice

questions

.t.

Which

of

the

following

substances

forms

a

colourless

solution

which

reacts

wilh

acidified

aqueous

lead{ll}

nitrate

to

give

a

yellow

precipitate?

A-

Sodium

nitrate

8., Copper(ll)

sulPhate

Z Potassium

iodide

-

D. Calcium

nitrate

2.

A

metallic

ion

in aqueous

has the

following

characteristics:

l:

Forms

a

white

precipitiate

with

NaoH(aq)

and

is

soluble

in excess

NaOH(aq)

ll: Forms

a

white

precipitate

with

NH.(aq) and

is

soluble

in excess

NHJaq)

Wltich

of

the

following

ions

best

fiis lhese

characteristics?

-,{

zn*

B. Ca*

c. Pbz-

D.

AI*

C

c)

({\

3.

Two aqueous

solutions,

P and Q,

are

mixed together.

Which of

the

following

pairs

willnotfroduce

a

whjte

precipitate?

7Po.\

A.

Sodium

hydroxide

Calcium

nitrate

/ D )

B-

Situer nitrate

Barium chloride

[

/

/

C.

Zinc

nitrate

Sodium

hYdroxide

-F.

"'Sodium

iodide

Lead(ll)

nitrate

4. The

following shows

a series

of

reactions.

('fl

)

C.

Calcium

sulphate

D.

Lead(ll) chloride

S.

Dilute

sulphuric

acid

was added

to

a

testtube containing

unknown

powderThe

reaction

produced

a

gas

which iurned

limewatercloudy.

Afterthe reaction

has stopped,

excess

aqueous

sodium

hydroxide

was added

to the test tube.

A dirty

green precipitate

formed.

What

could

be the

unknown

powder?

A. lron(lll)

nitrate

B. Copper(ll)

sulphate

,,e.

rcn$l)

carbonate

/'

D.

Lead(ll)

chloride

(c

)


9/37

6.

An

aqueous

solution

ol an

unknown

salt

produces

the

following

observations

when

added

to

the

reagenhs.

Reagent

Observation

Aqueous

sodium

hYdroxide

Reddish

brown

gelatinous

precipitate

tormed

Dilute nitric

acid

fotlowed

by

aqueous

silver

nitrate

solution

VVhite

precipitate formed

Which

of the

following

is

ifie unknown

salt?

A.

Copper(ll)

sulphate

B.

Lead{ll}

iodide

C. Calcium

sulphate

y'

lron{lll}chloride

T.

Which

of

the

following

reagents

is best

used

to identify

sulphuric

acid

from other

types

of acids?

A.-filver

nitrate

.6- Barium nitrate

-'c

Sobium

hydroxide

D.

Magnesium

carbonate

'r1lflmc:'irt*{t

A.

NO;

B.

co"o

'-,7

rd

Na;

'

D.

so.*

g.

when

aqueor,

,rn*or@rhbride

was

heated

gently with-aqueousY

a

gas

was

produced

which

turned

the

red

litmus

p#er

blue-

which

is most

likely

the

ion

present

in Y?

tirlg*

+

cll-

-+

r\il3

r

l)c

U,

.

74'*'

(C"t

1

ll>C

)-

Two unlabelled

bottles

are

placed on

ataHe-

One

bottle

is

known

to contain

aqueous

soditjm

iodide

and

the other

aqueous

sodium

chtoride-

Whicft

test

would

identify

the

solutions?

tK

adained

lead(ll)

nitrate

/

g.

Acidified

silver

nitrate

C.

Acidified

Potassium

nitrate

D

Aqueous

sodium

hYdroxide

10.

\JVhich

of

the

folloring

results

is most

likely

to be

seen

when

aqueous

ammonia

is added

in

eD


10/37

2- Complete

the

following

table.

Formula

ol

ion

Observation

when a few

drops

l{a0H{aq) is added

Qbservation

when

excess

NaOH(aq)

is

added

L'ct

white

precipitate

white

precipitate

remained

Fe*

v-{1,1,,,h -

$,v,v1t

y*r, yl,

I

u

r


11/37

Section

C

Free

reponse

questions

1.

When

a mmpound

p

dissolves

in water,

it

gives

clear

blue

colour.

,when

aqueous

sodium

hydroxide

is

added

to

p,

a

brue

precipitate

e

is

formed_

when

F

is

actded

to

agueous

sodium

hydroxde

followed

by

powdered

aluminium,

it

releases

a

gas

R

pon

gen{e

heating-

Gas

R

turns

damp

litrnus paper

blue.

when

precipita{e

Q

is

afied

to

a dilute

acid

s,-a

Hue

solution

T is

produced-

lrvhen

solution

T is

added to

acidifed

barium ni&ate sorution, a

white

precipitate

v

s

il*"d.

(a)

Deduce

the

identities

of

p,

e,

R,

S,

T

and

V.

(b)

Write

a

chemicat

equation

fior

the

brmalion

of

V.

2-

The

diagrams

betow

shoru

a

serie

of

reae{ions.

(a)

ldentifyL,

M,

N,

pande.

lbl

.ryrF

a

cfremicatequation

forthe

reaction

between

L and

NaOH(aq).

(c)

write

a

chemiral

equation

{or

the

redrrction of N

by

carbon

*ono":il.

(

b

)

EnNAc\,

(1,

c^9%

Lry

4

BnbD4o

u

t

\

d

Lon

(tt)

x$a4e-

(

t

|LL(N

o*

t3)

h)L

tl

:

N'I

Jan(t

) le/ny',k-

trvn

(

iv)uol;L

C

'

Yiol{tn

iron

6

'

Brudt*

sd'fule'

Element

P

which

is

the

main

component

in

making

steel

(b)

?e70rr3,

o

&N^aLl

t"Xr

A

'f,*(ot+)z

*/

+

)'lq'Sas

ult

tt)

Tuu9

t

r

ff-|---+

>f*

{

scb>


12/37

()

ASSESSMETIIT

FC}RTOPIG

"ACID'

BASES

AND

SALTS'

DATE:

NAME:

Section

B

Structured

quwtions

1.

(a)

Defineacids.

t'"Ok

(b)

{c)

Sodium

hydroxide

with dilute

nitric

acid

to

produce

a salt

and

water-

Give

trree

propertie

of

acids-

(i0

Wrfie

tfe

ionic equation for

this

reacticn.

0[l'til,,t

ll'(/,,,u

2.

ta)

(ii)

(b) (il

(ii)

Suggest

a salt which can be

prepared

by

titration

method.

tlnLL

Write

the formula of

the

ion which is

produced

in aqueous

solution

of

(i)

*.dd,,+

an

alkali

For

the

salt

you

named

in

{b}{i},

suggest

the suitaHe

reactants-

t'/a

oH

rt.J

ACt

(iii)

Hor

do

you

test for the

purity

of the

salt

produced.

A

sample

of

4.00

g

of

coppe(lt)

oxide was

used

as

the

starting

material

to

prepare

oppe(ll)

sulphate

crystals

(CuSOoSHp).

A 500 cm"

of

acid

solution

is

used.

{a)

Suggest a suibtde

acid to be used in the

preparation

of the salt

5.

il

h*,,:-

,vi

Ll

(b)

To

arroid any excess of coppe(tl) oxide

or

the

acid, calculate

the concentration of

the acid

to be

usedinthereadion'

rtr)c*

"

cuc

--+

curs';4

+

liLo

NrX

il,L

I

rhDl

q

Cro

'-

2"+:L\L.d

orni.l

*,t }

llrst*

'uwt


13/37

4-

(a)

Lithium

nitrate

is a

soluble

salt

which

can

be

prepared by

the

titration

method'

tii

ftfr*t

the

suitable

reactants

to

prepare

this

sali'

Acid:

Alkali:

(ii)

Explain

why

the

titration

is suitable

for

the

preparation

o{

this

salt'

(b)

Lead(ll)

sulphate

is an

insoluble

salt'

(i) Name

the

method

to

prepare

forthis

salt'

(ii)

Suggest

the

suitable

reactants

to

produce lead(ll)

suiphaie'

(iii)

Write

the

ionic

equation

{or

the

reaction'

Aqueous

sodium

hydroxide

is an alkali'

(a)

What

is

meant

bY alkali?

l, |

."

,.t

1

i,t:.'t\

':il

1',.i:'.1

:-.

:i l-

':

'

1"''

:"-

|

,,,

,i

-._

,_

r-.,;

..i

t,i"

-

--

(b)

Ethanoic

acid

reacts

with

a

calcium

t9

fiqlf

3-sai

tr-:'=

=:;-'=

*E:tz;:--suggest

the

name

of

the

salt

when

sodium

hydroxide

reacts

with

eiha::

:

:

: :

(c) Aqueous

sodium

hydroxide

is

gradually addet

::

=

-::

1

=:'::':-:

=;'

;:*

&e

soluiion

is

neutral.

(t)

Suggest

a

way

how

to

determine

if the

sa'---':'-

f

= i-=

'

:-

(ii)

Write

a balanced

chemical equaiia*

i:'-':

:=::-

:-

(d)

\t- ,-l,,.,_r

'1

t

tf,-i-

:

-

'1

Aqueous

sodium

hydroxide

is

graduaii." a::=

--.-e-

A

green

PreciPitate

Aqueous

sodium

hfdroxide

is

graduati-v a=::=:

i:

=:-=:'-:

:a:l-r-:

-'-3:u-

rl

stEv'

I

Prr

iron(ll)

hydroxide

is rormeO-

nriotner

qix--=-

-a:=*'-

'.-4:*'

*r.?r=

r:

i*e

solution'

(i)

WritL

a

balanced

chemical

equat=r':'-

:;:

:=::r-

(ii) Write

an

ionic

Suation

for

t}'r:s

===::=

Sec'tion

C

Free

response

questions

i.

potassium

chloride

can

be

prepared

from

the

reaction

between

aqueous

poiassium

hydroxide

and

an

acid.

(a)

Suggest

a suitable

acid.

':

i

--.

i

iUi

wtG

a

balanced

chemical

equation

for this

reaction'

,, .

.

icj

oescr6e

fully

how

you

would

prepare

pure potassium

chloride

crystals

from

these

starting

materials.

(d)

Writeanionicequationforthereaction-

,;l

,;.1

.

ri'-r.-.,

-'-

;...

-

:i

Dilute

silver

nitrate

solution

is slowly

added

into aqueous

hydrochloric

acid

solution'

(i)

Name

the

product

formed.

-

',":

"rri"

.

'

iiit Oescribe

tullv

how

you

woutd

obtain

the

pure

dry

product

from

the

reaction'

i"'"

Inr"o*,

,i.ri

"*;

"i

o.s

rnoyam' sooium'hydroxide

was

used

to

react

with

1.o

mol/dm'

oi

dilute

trydrochloric

acid.

(0

Writeachemicalequationforthereaction.

'""'''

t:

''

iii)

O.t"r*ine

the

volume

of

acid

that is

needed

to neutralise

the

sodium

hydroxide

completely'

2.

(a)

(b)

(c)


14/37

NAME:

()

DATE:

ASSESSMFNT

FOR TOPIC:,.SALTS,,

Multiple-Choice

Questiors

1.

which

of

the

following

pairs

can

be used

to

prepare

potassium

sul{ate?

A

Potassium

and

dilute

sulfuric

acid

B

Potassium

and

aqueous

sodium

sulfate

b'-

Loornrs

potassium

hydroxide

and

dilute

sulfuric

acid

u'D

Aq.r"or*

pot*.si

r*

chloride

and

aqueous

sodium

sulfate

2.

Dilute

sulfuric

acid

was

added

to

a

salt.

There

was

a

vigorous

reaction

and

a

colourless

gas

was

evolved.

After

the

reaction

had stopped,

excess

"qi"oot

sodium

hydroxide

was

added

ro

rhe

mixrure

and

a

green

precipitate

ii iormed.'What

could

the

salt

be?

,"

,A

Iron(tr)carbonate

B

Iron{III)

carbonate

C

CopPer(tr)sulfate

D

CopPer(tr)

carbonate

3.

'Which

of

the

following

chemicals

could

be

used

to

distinguish

between

aqueous

copper(Il)

sulfate and

aqueous zinc nitrate?

'A

Sodium

hydroxide solution

,..3

Barium

nitrate

solution

A

l and

2only

C 3and4only

4. An

aqueous

solution of compound

X reacts

with

sodiurn

hydroxide

solution ro

form

a

white

precipitate,

but

it has no

reaction

with

aqueous ammonia

solution.

Vhen

silver nitrate

solution acidified

with

nitric

acid

is added

to

solution

X, a

yellow

precipitate

is formed.

Name the

salt presenr

in

solution

X.

'*K.

Calcium

iodide

C Zinc

iodide

5.

'Which

of

the

following

pairs

of

gases

changes

the

colour of

moist

red

litmus

paper?

t-)

4

B

Ammonia

solution

Silver

nitrate

solution

Z ar.d4

only

A

Ammonia and

carbon

dioide

C

Carbon

dioxide

and

chlcrine

\_".D

1,2and

3

onlY

t't',.

-

,--

|

i

..:-i

iri.l I )

B

Calcium

nitrate

D Zinc

sulfate

r-.,V

Ammonia

and

chloqine

D

Carbon

dioxide

and

hydrogen

chloride

/

+.

i*t'ti+'t

I

.

i

.(

-;1..

,.'

,

.,

t-,

\

.:

,,

l

,

-J

/

/ :l

i;i'i':

-tr' \1-

'/

',i-'J:L,',i-i,-:i-'

l\r,{;i

l

r-

.i

'''i'

r'.

'

'

I


15/37

.

,rJ"f

'-"1Yf

-1''"

.

-""1.14il-

t,f

,',

J

' r{

't,a ")\,iNlqJ

?lregqa:r

{be)13e9

f

rusIlreg,.

alellns

umrqlfi

(m)

atBr{u

eurT

{u}

aplrolqf,

pBe'I

(l)

5P.Be?q$1,IsS,,

I

, *'.'

\'-4r;t;

I

r

r'"1'

\

=

F'l?

"-;::

,

.',,;;l

;

',.,j.,

i

;"

5

','i

r.4,,:.]_,

:".i,

,,,

ir,r,:

r;1|y

,,;:

l:,:1

,i1,,.;;l,l[

:::::,ii:;

'

1r,5.''L.yrr,\

e'

*

tv)

'11;'tl

f

l{-"i' :':''''{

u

)'')a("r'r'

'

-/J

t

i

..

'i

r,:t,,,ll,.la

*

ln'i

l):lJ.

(.t')

.

t,,l

(.,.)

r

li

l

:f

lt

*

,\r.,(1r.1;l

,11

''r")t

.l

t,ir

(

,,

)

I

,7t

l

&'.'

'-t

r-

"':

-);

J

'

l"'

,'

)Jt

lt

t-

"';

j

al',1'ltl

'l'

-'L

'

'

7;

't{

(

":

:

;1

-i.

i

t'f';/'':'1"^'"1;. nl"=-"Jx)-"N"t'lt')d{["i/1ttt^i

**ar,t-,

trtutl'

s11;r;'

-r,r{n,7-tl';

,'l ''

:'n1"1

fh'tt'4i[;t^

5,]:

-ti'ttt]"riS

/'"

-"i

(;i1

,1,,.rh

L

'"',:,,,

-

'4'rri'\

..niit

I

--l'"''i

L'i

c.r1f

,,tt,t:7;;:;.i

:jt

-s,,z.l?'l

)'j')\)

bs

t,

J-l

'

17trt

1l'rt-t't

\;t'7

5'

hl)"l}"{Tli\

(r'

I

(

'l

t

?

(s4:em

g)

-,fuoleroqel

looq3s

3rp ul

sJersln

alerru

umrpos

a{aur

ol

r{og

dgagq

agrrf,saq

(q}

(s4reur

g)

'palelrdna:d

are;ps

umrreq

Jo

ssBtrr

agl alBInslBD

'Pr:e

3lmflns

ruP{o1u

0'I

to

furf,

00I

01pappB

sr

uol}nlos

sprrolqf,

rrmrrBg

frrrp/[olll

0'I,o

su3

0'sz

luautJadxe

ue u1

(t]

'L

(s4reur

7)

-'elurIns

(U)pual

ol

alruoqrpc

ig)pea18url:aauo:.ro1

pa

lo^rr

sdals

a{t

^\ogs

ol

suogenba

alrrl[

(r)

(s4-ruru

7)

'{111Xq)

rrr

uousear

eqr roJ

uopenba

f,rrrol

atp

ary16

(41}

(>1ieur

1)

'areqdsogd

ui3orprtq

umrposrp

ql,'&

spEar

apgorp,(q

unrpos

uaqoo

pacnpord t*s

aW

eurgN

(III)

lqrrur

T)

'areqdsoqd

ua?orpr(q

umlposlp

sarnpord

legl

uocf,ear

uorlzsrleJlnau

aql :o;

uoBrnba

aql aryrl\

(X)

(sryeur

71

lIEs

P

Prr?

Pr?eue

qloq

q

rr

,(qr'r

ureldxg

ti)

''OC4fuN

sr

aleqdsoqd

ua8orpdq

rumposrp

ro

Blnurrol3r{I

(q)

(qreu

9)

,.1i,.1.

.*

->,r:ii;\]

A

*

-4u,,r,

]Dlt{ti,,f?

r#nl

i/t{

\1,,r,';11

,{ -'4t't

*.

a4ql+s,:Tg.,sf

tF

arnd aql

uptqo ot

po$rW

'e.rnlxlur

uortrscar

agi

urort

rps

amd

eq1

urrlqo pForra

nod

moq

dgagq aqmsa(

'qes

agl

aredard

ot

papaau

Sua8ear

puof,es

ary

+sa88ns

'uonetedard

rles

3urmo11o;

3rI1

,o

gf,ea

uI

(e)

'9


16/37

)l'lr0>

u

C>

T

,q.C

+r,,*

N,l'ffi^>

.r

0.rrE

Same

am-ount

of

hydrogen peroxide is used in

both

experiments.

tf

curye X

conesponds

to

40 cm"

of

2{tlblldfif

,

which

of the

conditions best

frts

curve Y result?

-.

A-

10cm"o@,LnoUdm"

Nrl

,

,

,,4

/',)

\

B.

1ocm'ofSmoUdm'

llot

.

d'et)

'

l)

.t

C.

100

cm' of

1

moVdm"

yl1

:

c

i

D. 4o crn,

of

4

mol,/dm"

H.,l

=

0

.t

6

3,

ln a reaction, calcium

carbonate in

a flask is

placed

on

an electronic

balance.

Dilute hydrochloric

acid is

added and

a cotton wool is

placed

at the mouth

of the flask.

The total

mass

of

the

reacting

flask

is recorded

every five

seconds.The diagram

below

shows

the

results

of the reaction.

Total mass

of

the flasklg

{il)

5101520253A

Alfihich of the following

times is the reaciion

fastest?

,4. 5s

/

g.

1os

C.

15s

D. 20s

NAME: t)

ASSESSMENT

FOR

TOPTC:

'SPEED

OF

REACTION"

Section

A

Multiple

choice

questions

1.

Two experiments were

carried out according

to

the lollowing

conditions:

DATE:

400

cm"of

2.b mofdm'HCI

+ 4o0

cm" of. 5 moildms

NaS"O"

10o cm'of

8.0 moudm" HCI + 100

cm" of

8.0 mol/dm"

Na.S,O,

Same

I is less

than ll

I is less

than ll

Same

Experiment

l:

Experiment

ll:

A.

I is taster than ll

B-

I is

slowerthan Il

C.

I

is

faster than ll

D.

-

I is

slower

than

ll

Total

volume

of oxygen

The initial speed of

sulphur formation and the

total mass

of sulphur

collected were

measured in each

experiment. Which of lhe following

resulb is

conect?

Speed of

sulphurformation

Total

mass of

sulphur collected

(e/

2.

Two

different conditions

were set up for the

decomposition

of trydrogen

peroxide

to

invesiigate

the

speed

of

reaction.

The

graph

below shows

the results of two

different

conditions

used-

curve X

curve

Y

t).e+a"{

)

n,"tfd:

30

28

26

24

22

2A

40


17/37

/-- .

4.

Which of

the following

will not make

a chemical

reaction

o{Astin

A- Using

powdereO-catbium

\---

fleating

the solution

Using

big

size

magnesium

striP

Using

4 moUdm" solution

instead

of 2 moUdm"

B.

c.

uD.

,/

5.

\rrlhen an

pxcess

ol copperill)

carbonate reacts

with dilute

sulphuric

acid,

the reaction

becomes

slower

greduafiy.

lt finallY

stoPs.

Which

of the

following

reasons best

explains

why

this

happens?

A. The copper(ll)

carbonate

is

coated

with insoluble

salt.

,' /^

Bt

The

copper(ll)

carbonate

does

not

rea*

well

in

dilute

sulphuric

acid.

(

t

-r'C.

The coppe(lD

carbonate

has caused

the acid

to

be

used

up

completely.

D

The copper(ll)

carbonate

has completely

used

up in the

reaetion-

6.

Aqueous

hydrogen

peroxide

decomposes

to

yield

water

and

oxygen

according

to the

following

equation:

\

,i

FLO,

*

2H,O

+

O"

The

following two experiments

were set up to

measure the

speed

of oxygen

production

from

the

decomposition

of hydrogen

peroxide.

,

.-.,

toO cm" o(0-54nol/dm"

H,O" solution

is used

200

cm3

ql

0.1

moUdm3

H"O, solution is used

\--,

Vt/hich of

the following

graphs

best shows

the resutts obtained?

.4.

Total volume

of oxygen

B.

Total volume

of oxygen

c.

Total volume

of

orygen

D.

Total volume

of

oxygen

Experiment

l:

Experiment

ll:

/r

)

(

/1

)


18/37

7.

tn*nic,yRe

"f":ti'J"lo"*"""

beins

reduced?

A.

NHuto

NHr-

--

7-

--

'

3

,

B.

NH,toNOf

-

\

-

t *-(t4 ?

c.

No,ro

NO;

=---\-.--$

-J

h

'P

-7

,

15

-,D'

t'i-i

-xs

*v

t

n5

i

>)

8. Which

of

the

following

reactions

is not

a

redox

reac'tion?

A..Ea

+

2HCl

*CaCL

+ Ha

"-6.'

ugo

+

2HCl-Mgct

+

Hro

C'

ZHBr

+

F"

'ZHF

+

8r'

D.

Cu

+

+HNO"-Cu(NO.),

+

ZH,A

+

2NO'

9.

Whicfr

of the

following

definitions

ol

reduction

is conect?

Oxygen

HYdrogen

Electrons

n.

Galning

Losing

Losing

-

B.

Losingl

Gaining

Gaining

C.

Gaining

Gaining

Losing

D.

Gaining

L""iU

Ga'

'

-

F'A

nrns

)Rh

,7'

10.

A sample

of air

is collected

from

an

industrial

are9,{cnecktor

the

eualitv;trair'

What

result

would

be

--

obtained

if the

air

is

poff

uteO

with

sulphur

dioxidf?

/

,Acidifledp"t"tlir*EctrpgqaelVry

Acidifiedpotassi/miodide

4.

c,eedbiE:9:'il'{ew'-'-''

"-'Hl,i}'##*"="

B.

Green

to

orange

'

C.

Orange

to

green

Brown

to colourless

D.

No

change

Colourless

to brown

Section

B Structured

questions

1.

Equal

lengths

of

zinc

ribbon

were

added

to 2

moUdm"

nitric

acid

and

to

2

moydm"

of

sulphuric acid'

Wiren

the-reactions

has

stopped,

zinc

ribbon

still

can

be seen

in the

solution'

(a) Write

a

balanced

chemical

equation

torthe

reaction'

(r1

* lft?t,/

'*'

(,::.*-:)

(b)

ln whicfr

reaction

woutd

you

expect

the

speed

is laster

at

the

start?

Explain

your

answer'

,'i.

'L

r\

t

,,;r-

,,",*t

How

would

You

increase

the

acids?

of

the reaction

without

changing

the

concentration

ol

the

ll,,'.'i

':t,i'rtr,'t

,i"4/

Explain,

in terms

of

the

collision

theory

6ow

the

factor

you

named

in

(cxi)

can

make

the

7;,Ll

t-r

,1'

,

r

,l

(c)

(i)

(ii)

reflction

to

go

iasler?

l;1,_sfuL'.',r

i

lr,,,l-

t

'L

/

,.;f "u

,u;l

fu

i,u

I

,/ -iAt{'

.,,

a

fivs

i

LJlu:t

',

,l-

1

I

t

.'.

-r'. .n'u

t:*i,4

.r'- i{i-6

/i

;a-''Jt#

).\

,

,,.

, , t,

I

\l

L -

,j

(xL'l

I

I


19/37

Z. Sulphur

can be

made by

the

reaction behveen

hydrochloric

acid

and

sodium

thiosulphate

as

shown

in

the following

reaction:

zHCl{aq)

+

Na"S"O.(aq}

*

2NaCl(aq)

+

SO,{aq)

+ S(s)

(a)

State

two

ways to

increase

the speed of

the reaction-

hrri

lK-

itf r^fi.

vt

I i,ttrt_t,N-

Lrrr*

L

(b)

In this

eperiment,

1O0 cm3

of 0.5 moUdm'hydrochloric

acid

is added

to 1O0 cm"

of

0.5

moUdm"

sodium

thiosulphate.

Explain why

the

reaction stops.

l|Lt

i

t

&"

*)

iL

hul

, vYp

i

r'vb

{irvt,

9'olwhc,u3

How

would

you

test for the

presence

of

sulphur dioxide?

An experiment

is

set

up as

follows to measure

the speed

ol

reaction

between

coppe(ll)

carbonate

and dilute hydrochloric acid.

cotton wool

reaciing

mixture

balance

Write a balanced chemical eguation

lor

ihe

reaction.

i"tJ-i.,

-f

>,1/

i

4

lt^tl,

t

([.

r

The cotton wool is

placed

at

the mouth

of the flask

to

prevent

any spillage

from

the content

of the

flask.What is

the objective

for

doing

so?

O

/i)'tjvYryf I

ad LLL[',,ji./

nti

rilliLt

-

/

(a)

(b)

{c)

The

results

of the investigating are shown below.

Plot a graph

of

loss

in

the

reacting mass against time on the axes provided.

From

the

graph,

suggest the mass loss one minute

afterthe

reaction.

(0

(i0

Time/min

2

3

4

5

b 7

Loss

in

mass/g

0.20

0_30

0.35

0.38

o.40 0.40

when the reaction has stopped.


20/37

'

('\)fll

lt)

I

/

(i')

,

I

I

j

'

tl

I

t-

(iv)

Sketch the curve on the same

graph you

would

expect to obtain

if

$wdered

coppe(ll)

carbonate is used instead of

lump

coppe(|}) carbonate.

(d)

Suggest

two

other

ways, besides using

lump

copper(ll) cadlonate, to decrease the speed of this

-

-i';,*1".,

.


21/37

NAME:

()

ASSESSMENT

FOR

TOPIC: "ORGANIC

CHEMISTRY"

Multiple-Choice

Questions

1.

W'hich

of

the

following

statements

about

alkanes

is

truel

A

Some

alkanes

contain

a

double

bond.

B;

Some

alkanes

are

more

reactive

than

alkenes.

,;tC

All

alkanes

are

saturated

hydrocarbons-

D

All

alkanes

have

the

same

physical

properties-

2.

When

the hy&ocarbon

C.H*

is added

to

aqueous

bromine,

there

is

no

colour

change

the

colour

changes

from

colourless

to

brown

the

colour

changes

from

brown

to

colourless

a

white

precipitate

is

formed

3.

Ethene

and ethane

are

both

trnsaturated

hy&ocarbons

react with steam

to

give

ethanol

contain the

same

number

of

hydrogen

atoms

burn

in

excess

oxygen to form

carbon

dioxide

process

by

which

ethene

and

hydrogen

are

(c>

A

Br.

trE

"D

A

B

C

E.

V

4.

The

(c)

(D)

obtained

from

petroleum

is

called

(B)

racking

&actional distillation

hydrogenation

substitution

reaction

5.

A

vegetable

oil

is described

as

polyunsaturated.

Which

statement

about

this

vegetable

oil

is

correct?

u)

It

produces

margarine

when it

reacts

with

steam in

the

preseoce of nickel

catalyst.

Structured

Questions

6.

{a)

Identify the

following

hydrocarbons:

(i)

crH.

[.f"*''*

(ii)

CrU.

3'uyu''


22/37

7.

{a}

Therearethreeisomersofcnr\.Drawtheirsrructnres.

(3marks)

(b)

Under

suitable

conditions,

bydrocarbon

X reacts

with

srcam

to form

ethaaol.

(i)

Write

the strucnrral

formula

of

X and

ideotify

X.

{ii)

State

the suitable

conditions

for

this

reacrion.

(c)

The relative

molecular

mass

of

an

ursaturated

hy&ocarbon,

Y, is

54. It

is

found

that

13-5

g

of

Yrequired

0.5

mol

of

bromine

for

complete

reacrion.

(i)

Hour

many

carbon-carbon

double

boads

(G-C)

are

present

in

one

molecule

of I?

(n)

Sr

ggest

the

strucaral

formula

of

Y.

{2

marks}

(2

marks)

C*C=C-C

(-C=C

i

.-"c-

)

ID

tit

(2

marks)

(2

marks)

(a)

-t

l-l=L-

I

-c=:-

illuoz--

(ii

)

,3,ra', ,

6t'xbn,

fh*f

Lonc(v')

au'cl

(c)

(;

)

Nt

rq

r"'l

rlY,oul'

""'&-

=

a

25

*ul

,tu,hr('rl\

F,,

=

dL5',r':

g,aclt

,'-

*"'l

wil

'u"al

wlh

I

'n"[

?

F''

t

l,r'u,,

?vtt

twW'L'1

'f

u*h"tu

2

t'L

bc'nds

(

ii

)

-L

,l

-

I

,;

-'

*r,u

mott,.rlw'

rnttiS

,

(Axril1

(6*tS

-

5?

,)Y

I

8- Pure

ethanol

can

be

obtained

by

the

following

series

of

reactions.

Stage

1

--"+>

Dilute ethanol

solution

'ry@

(b)

{c)

(1

mark)

{1mark)

(2

marks)

(1

mark)

(2

marks)

(d)

(a)

ti)

State

the

process

in stage

7.

trer'nw,'{r'd^ln

(ii)

write

lhe,chemigal

equation

f^orthg

reacrion

rhat

occurs

in

srage

1.

Exprain*t;k::l^vdlff"?s*,Y,1 ;:y"J,1.r",1,

(i)

State

the

pracess

in

stage

2.

(n)

Explain

how 95"/"

pure

erhanol

is

obtained

in

this

process.

Ethanol

can

also

be obtained

from

petroleum

fraction.

tm'+Y@'tr@

*

I

Nt^lfiuLracby

"Ad'l't;t't-

j

sl*'ttn'

'f"

e+Lerc''

.

{i}

state

the

pr#esses

that-take

place

during

sLge

1

and

stage

2.

{2

marks}

(ii)

Name

the alkene

produced

in

stage

1.

(rlhttte-

(1

mark)

**

{iii)

'Write

the chemical

equation

for

the

reaction

that

occurs

in

stage 2.

{1

mark)

$1fi",,e-

dht

tol

;s

,*

obft'"'l

,i''t

stzy

I

hrr*e.

yu^+,i:

btU,l'

*d

Jr^'nl'tk''

ilup)

u)[y./L

St6p-

t:zr"th;+

ytitfw-

drlhuU

,v14

lfi/^

lt

/

7

Qil*-ct

(

c

)

(l)

h"*l'"'r''J

'Lsfi|"rtt'rr

(i)

hrttrr?

eltv^t:L

'ol$h}^

LN+^iw

N"V

TA

W'ol

'

C',t'ol

itn

'-

./'* \;:;;

't)+'

on 'Y"L'':l

tttd.thtoa'

f*-

dtvr"l

i'

l'tfitU\

ovvt

CAVa

[1ro

-s

tyrl5ovl


23/37

6-

State

the

o3Eld_c

pSdscls

formed and

identify

the organic

compounds

A,

B,

C

and

D

irr

the

follorving

reactions.

(a)

A+NaOH+HCOONa+H,O

{2

marks}

(2

marks)

{2

marks)

(2

marks)

{b}

B

+

MgCO.

---->

(CH

Mg+FLO+CO,

g}*

r1o

H+FlO

7.

A fq*r

&ops

o{

concentrated

sulfuric

acid

are

added

to

a test

tube

containing

a

mixrure

of

V

aad

butanoic acid. The

mixture

is heated

and a sweet-smelling

substance

W is

obtained.

The

strucarral

formula

of

IV'is shown below.

o

ll

cH3crLCrL-c-o-cHrcH,

iai

-lEhat

type

of

reaction occurs

in

this experiment?

{bi

'What

is the purpose

of

concentrated

sulfuric

acid in

this

reaction?

{cl

Give the

name and

full

strucarral

formula

of

V.

td]

Predict

two

physical properties

of IV.

ie]

Stare

two

uses

of W.

ifj

Suggest

a

chemical method

which

can

be

used

to

distinguish between

{i}

butanoic

acid and

V.

{ii}

Y

and

V.

l-t

v-

'

,r

j

:l-r-

I

,1

l

{c}

C+C,H,OH_+

(d)

D

+

IlCrrO7+

(;

tft)

((

/

lr

i,{ i

[

'/

(2

marks)

{2

marks)

,,-',r.I5y-f,lf

i

'-|

i'rr"rr-

;tt11

-t'ul

(1

mark)

(L

mark)

(2

marks)

(2

marks)

{2

marks)

;t.;) ..i,.

tii,-;t

1tr.1-tt

t

(fi,.ttt,

t

i

/l

l

itit.(

{-z'."ilX

,'

fi

71t1.,L,11

(',]

(,

,);'

i*

;

/

i"

t,)

J,

'-,r',

',",),,r-'-

,

,.

'

"-

.

i'-

;-rl

r, {

\

I

jlr..t

r

l

l,

,i

,',-

i;'t

1-fiiir,1r:J,

-.

.l

.\- .

.r .

-.

"..

,r'k

,t,

l-

/.'1".'

t''t

-

t"

I

'-

i I

,.t

-

L-

t'\l

;:'

i'

't'

l

I

,,,,,

,1';',

'

"'i

. ,

i)u-,'

.\

'-'rlL

/)

:.:,);i:.,1ii--

y.

:li::,,:t,,,*

Jr

(-.

t'

.-'i

')."i,

I

.+

I

I \ -,\l(

t

\.

r

i''ft'


24/37

Styren*butafiene

* ryt

(SBR)

is

a

type

of

synthetic

rubber The

structures

for

sryrene

and

butadiene

are

shown

below.

HHHH

II}I

C:C

C:C

tttl

c.H,

H

C.rL

H

sryrene

buadieae

(a)

\[(hat

type

of reaction

occurs

when

sryrene

reacts

with

butadiene?

Givea

one

reason

for

your

answef,.

(b)

One possible

s:trucrure

for

SBR

is

showr

below-

-

styrere

-

butadiene

-

styrene

-

butadiene

-

styrene

-

butadiene

-

Give the

parrial

stnrcture

of sBR

that

contains

two repeat

units.

(2

marks)

,

(2

marks)

(c)

State

two differences

between

styrene

and

SBR io

terms

cf

molecrrlar

structure.

(

a)

#al,hu

n

Ylw*tt;scl't't1

lL(t'tt

k t'ls:'1'Cb*

4o*br+

h'nrt

t;,"\

o&'ttrs

'bBcrurr


25/37

9.

One type

of nylon is

catrled

nylon-5. Nylon-5 is

made

ft"*

""ri""iexanoic

acid.

The strucarral

formula of

aminohexanoic acid is shown below.

o

}I

{c}

td)

o

il

ir

c"*

i

N-

-r

;

;-t

(

{ .t

r)

5

Ctlt);

-N+Zr

('{.t1r}t;

-*El

.+t

r'-

t"rl,

).-

-

L

u'/-'h

-*

i'l

I

LI

i,C

)

C

it

c,

*(

(it

r)r

',t

c

{lt,.l,

*N

I

t.l

/1

{i

it

C-

I

I'J

.-

I

t4

H-O-6-tcg,-N-H

tu.1L.,iir,frt'*,

y:lrrrtw-'t5;,1

''n

H

{a)

What

rype

of

reacdon

occurs when

nylon-6

is

produced

from

aminohexanoic

acid?

(1

mark)

(b)

'Write

the chemical

equation,

using

surrctural

formula,

for

the reaction

to

produce

nylon-6.

(2

marks)

What

pype

of

linkage

is

present

in

nylon-6?

Draw a

circle

around this

linkage.

hntia


26/37

-l

NAME:

()

DATE:

ASSESSMENT

FOR

TOPIC:

,,CHEMICAL

BONDING,,

I

fne diagram

represents

the stmcture

of a metal.

oooo

erecrron--

o-o o

posirive'""-o

o

o o

(a)

Use

the

structure

to

explain

why

metals conduct

electricity. t1l

(a)

Drawadiagramof anatomof

silicon,showing^bowthe [ \a*-,

-,

,u',,.".i,:,,;,

electrons are

rranged

aod

the numbers

ofprotons

and

neutrons

in the

nucleus.

t3]

(b)

Give

two other

physical

properties

of

metals.

tZ)

{c)

Give

one chemical

property

of

metals.

tll

,t j

i

'

9't-

4

'L^Lt'i'in{ cl':cl4'r",

t

u)

r'1"12'L,tofiol',L^::.',.','"',1,,'1,,.n

_',,o,r.,,r,L

tlr-u,ut,,u-

)''yr..il;'

;"'l

7*

'Ltbe'i

,-)

r'.t'L

f;u'',1'

;',.'l"t'J

I

tu"*Q

(tt)

I

f;-tle'L;

t'i'c'

m{'lLlibt{''

4'';t-

al

;'

Tiy*'

t\'a-

'^it-'',"

i''''l

'i'.;'i

rtt'

;vc>i'e'|

./

lltl

i\t-t-

i{)i'""

(i

)

i/tlt,t: '

,',n'L'''L

'u

'l

''

lxl

i-'t-

\t'

"'

i'li*.r

lv':'"

ti"/

-.

--oqd",

{s.i;i(.

,'xic}.)

-

-{\

f\,,dre,.,

,-nl;t

SiliconandcJronarebothinGrouprVofthePeriodicTable.

(fl

t

/

'+1-

r \----'"

a1'.:)

tt

ul

L

sf

(")',{T

'*f'

L

(b)

Cabon

and silicon

each

form dioxides

in

which the

t

bonding between

the

atoms

is

covalent-

Carbon

dioxide

I

has

a

simple

molecular

structure

whercas silicon(IV)

oxide

(silicon

dioide)

has

a racromolecular

structurc-

G)

Draw

a

dot-and-cross

diagram

to

show

the

boding

in amolecule

of

carbon dioxide-

(i0

The structure

of

silicon{IY}

oxide

is drawn below.

\,,

-si

I

g

-t

;,,-o'\;:--?i-

'

-t'--

o

I

Silicon(IV)

oxide

has a high

melting

point where

as

carbon

dioxide

is a

gas-

'

(

i,l

r^

J'0;,\tt:t't'

i'

'ltl-t"'i

i's

['6'n;'l

UY*r,

,..,1

i.,,,'t

t\lj;'v

'{l

'"'

';

J'--u(

It

'lv,r

Jili,,*

fiv''6

lhria"

t['

i*ait"'ll7

-

'ruu-"

,r"'n:

tvt''l '^

i"l

',;

''*

l("

+r'

ht-,+

,

o**

'ult"

'-

'l

-s'

L

'ur'

t ll*;

i

lhv

b

'li.,-

,rJ'l''""'t"'t

r(r

, i

r'/

r

,'

n1i,'"hu

l

J ,,r.

'

,:"'

,:,,,,,.;,

.

l,

,

l,:

",

;[.

,',

'

'''u'

6l'""rt

-{l*'t

'*

''

o

rrl,l, ,,

'1't'

Explain

this

in terms

of

the

structure.s

sf

the

two

oxides.

Does

silico*{iY)

oxide

conduct

electricity?

Explain

your

answer

with

reference

to

its

stnrcture.

t5l

flll

"-u-*'t

h-.'''L'

;'t

5tl'u"',tn)

ct;L

'-''t-

-tfiur,,,

"1r'r

,r'i--

''"i

'""'lJ

bt''k""t

':'t,

4

'

",i-

,'-.'t..

;@*)

t..L.'l

,:

{n-:

-''-rl

I

.)

(iii)


27/37

12

Diamord

and

gaPhire arc altotropes

of

carbon.

They

are both

composed

of macrornolecules-

Damond

GraPhite

Explain the

meaning

of the

following

tenns-

(i)

allotropes

(ii)

macromolecule

121

Graphite

is

used

to

make

lubricants

for

ergines.

Explain, in

terms

of its

stnrcnrre,

why

graphite can act

as

a lubricant

12)

ta)

(b)

(c)

Cive

one use

of diamood

which

depends

on

its

hardness.

tll

p,ft)Altrtafc

,

a,"c- ,L)ir"c"'l

':t

tJ

1h2

St,t,L*

'

a :'o4

'n

"

"t"

t'.nt

4tV'^

,' .,

,ldv

"';'1n'|'Y''n

nL

]L'r;'"

I

l*f,"",:::r::,,'

n le-.

o;

h'0""'

4fu-

iat'w

cwm't"'

I

I

(

i

r

)

lli.tet*[u,

1,,,;r^rr

r'

rL#;f,i'

{

nu*tt''

',1

Lvv

'

-

g

l'';"

o

llk'

;

$

Diamond


28/37

6rd

silicon

carbide

are

both

macromolecules'

Part

lcture

of silicon

carbide

is

shown

below.

\^L

I

I

--a--fi--r/-

li

I

/l\

ta)

(i)

Sta"

oo"

difference

between

the

stmctures

of

silicon

carbide

and diamond.

(i,

State

one similariry

between

the

structures

of

silicon carbide

and diamond

{21

(b)

Suggest

two

physical

properties

of

silicon

carbide-

QJ

(c)

Silicon

carbide

is

raanufactured

by

the

reduction

of

silicon

dioxide

with carbon.

SiO,

+

3C

2CO

+SiC

(i)

State

one

source of

silicon

dioxide-

(iii

What mass of

carbon is

needed to

make

20 tonnes

of silicon

carbide?

I4T

(d)

Silicones

are

pol5rmers

that

contain

the

elemenr''

silicon, oxygea,

carbon

and

hydrogen-

.

..

Suggest the

names

of three

combustion

products

oJs'

silicone

polyrner.

{1"i

r:*n

b)

0) 1'",

'h*n.n|

u'ti'i

(t*l+'rt

dru"t

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OLevel Chempractical 02-11 ANS