Mark Scheme (Results) November 2009

Mark Scheme (Results)

November 2009

IGCSE

IGCSE Chemistry (4335) Paper 2H

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4335_1F

Nov

2009

Registered

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4335_2H Nov 2009

ii

SECTION

Question

1 a

b i

ii

c i

ii

Mark

A

Acceptable answers

M1

(electron)

1/1836 / negligible

M2

M3

M4

M1

M2

M1

M1

M1

(neutron)

0

(proton)

1

(proton)

+1

(number of) protons and neutrons

35

18

5

isotopes

Notes

Total

Accept value in range

1/2000 to 1/1800 and

0.0005 to 0.00056

Ignore zero

1

1

1

1

1

1

1

1

1

TOTAL

Question

2

a

b i

ii

iii

c

Mark

M1

M2

M1

M2

M1

M1

M2

M3

M1

M2

Acceptable answers

Notes

9

Total

white

blue

fractional

distillation

different boiling points / boiling point

of propanone lower than that of water

heat / boil

propanone boils/collects (first)

stop collecting liquid above 56 ¡ãC

Accept wording that

indicates

that

water

collected separately or

not at all

cross in column 1 box 4

cross in column 2 box 2

1

1

1

1

1

TOTAL

10

1

1

1

1

1

Question

3

a

Mark

M1

M2

M1

M2

M1

M2

b

c

Acceptable answers

Notes

Total

loses an electron/electrons

Na+

gains two electrons

O2?

sodium oxide

Na2O

1

1

1

1

1

1

TOTAL

Question

4

a

b i

c

Mark

M1

M2

M1

ii

iii

M1

M1

i

ii

M1

M2

M1

iii

M1

4335_2H Nov 2009

Acceptable answers

Notes

6

Total

(bromine)

liquid

grey / black

any indication of chlorine in left hand

tube

hydrogen / H2

brine / sodium chloride solution / Accept

NaCl(aq)

concentrated/saturated

NaCl

Ignore sea water

chlorine

+

sodium bromide

¡ú M1

reagents

M2

products

bromine + sodium chloride

displacement / redox

Accept

reduction

/

oxidation

Ignore substitution

(chlorine)

more

reactive

(than

bromine)

1

1

1

TOTAL

9

4

1

1

2

1

1

Question

5

Mark

a

M1

b

M1

c

d

e

M1

M1

M1

M2

f

M1

M2

g

i

ii

M1

M1

iii

M1

Acceptable answers

Notes

Total

double bond / C=C / not all bonds are

single

contains

bromine

/

another

element/atom does not contain only

carbon and hydrogen

B and E

A and B / A and E / C and F

alkane(s)

CnH2n+2

Accept other symbols

such as x

yellow / orange / brown

colourless / decolorised

Ignore clear

If only colourless stated,

assume it is final colour

F

poly(ethene)

/

polyethene

/

polythene

addition

1

TOTAL

11

1

1

1

1

1

1

1

1

1

1

SECTION A TOTAL: 45 MARKS

4335_2H Nov 2009

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