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Summer 2013

Publications Code UG035595

All the material in this publication is copyright

Pearson Education Ltd 2013

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Questionnumber

Answer Accept

1 (a) can easily/quickly identify each gasOR

less likely to make a mistake in identification

IGNOREjust to identify the gas

(b) (i)

(ii)

(iii)

(iv)

argon/Ar and helium/He

oxygen/O2IGNOREO

air/it is a mixture (of gases)

ORair/it is not a single substanceIGNORE mixture of elements

not flammable/not explosive/does not burn

(c) (i)

(ii)

(iii)

hydrogen/H2

IGNOREH

carbon dioxide/CO2

carbon dioxide/CO2

air

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Questionnumber

Answer Accept

2 (a) D

(b) M1before heating colourless (solution/liquid)IGNOREclear/transparent/looks like water

M2after heating milky/chalky/cloudy/white

(precipitate)/turbid

IGNOREreferences to goes clear OWTTE

no colour

whitesolutio

any cothan w

(c) M1(sulfur dioxide/it) dissolves in/reacts with (rain)water

M2to form an acidic solution/an acid/sulfurous acid/acid rainIGNORE references to any other products whethercorrect or not

M3which reacts with/corrodes the marble/calcium

carbonate

IGNOREerodes / weathers / melts / eats into

SO2+ H2O H2SO3

ORSO2+ H2O +

O2

H2SO4for both M1 and

M2

sulfuric acid

chemicalweathering

dissolvescorrect equation forreaction with either

sulfurous or sulfuricacid

SO2reacts withmarble for M3 only

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Questionnumber

Answer Accept

3 (a)

Name ofbarium salt

Formula ofbarium salt

Solubility inwater

Poisonous

bariumchloride BaCl2

barium nitrate

barium

carbonate

BaCO3

barium sulfate

(b) M1(it forms) barium chloride/BaCl2/a soluble (barium) salt

M2 by reaction/with hydrochloric acid/stomach acid by

neutralisatio

word orchemicalequation for

marks(equation ca

be unbalance

(c) barium sulfate/BaSO4

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Questionnumber

Answer Accep

3 (d) M1barium sulfate is formed

M2 which is not poisonous/not toxic/harmless

IGNORE references to magnesium hydroxide not poisonous

M2 dep onM1

M3 barium hydroxide + magnesium sulfate barium sulfate +magnesium hydroxide

OR

barium ions + sulfate ions barium sulfate

products, pshown corre

word equatio

is insoluble

Ba(OH)2 +

BaSO4 +

Mg(OH)2

OR

Ba2+ + SO4

BaSO4

(e) (i)

(ii)

(iii)

M1 water (reacts) very/extremely quickly/more quickly thanstrontium/quickest

IGNORE rapidly/vigorously

M2 air (reacts) very/extremely quickly/more quickly thanstrontium/quickest

(without heating)IGNORE rapidly/vigorously

in/under any one of the following:(paraffin/mineral) oil/petroleum (oil)/(liquid) paraffinIGNOREin an air tight container

reactivity increases as atomic number increases

explosively/

explosively/

in a vacuum

reactivity inc

with atomicnumber/dow

group OWTTreverse argu

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positive corr

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Questionnumber

Answer Accept

4 (a) M1 (negative electrode) graphite

M2 (positive electrode) graphite

carbon

carbon

(b) (i)

(ii)

it/aluminium oxide/alumina has a (very) highm.pt

IGNORE high b.pt/references to strongbonding/bauxite has a high m.pt/lot of energy

needed to melt it

aluminium oxide/alumina is dissolved in/mixedwith (molten/liquid) cryolite

IGNOREcryolite lowers the m.pt of aluminiumoxide/alumina

added toNa3AlF6for cryolitecryolite is used as thesolvent(for aluminium

oxide/alumina)

(c) M1 reduction

M2 (it/aluminium ions/Al3+) gain of electron(s)

IGNORE references to loss of oxygen

M2dep on M1

reacts with/combines with

decrease in oxidationnumber/oxidation numberchanges from +3 to 0

(d) M1 oxygen formed/produced (at the positiveelectrode/anode)IGNORE oxygen from the aluminium oxide

M2 reacts with the carbon/the (positive)

electrode

M2not dep on M1, but must mention oxygen

oxygen from the electrolysis

anode / graphite

(e) Any two from:

M1 malleable

M2 low density

easy to shape/easy tobend/easy to extrude bend

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M3 does not react with food/drink(s)

IGNORE light(er)/high strength to weight

ratio/references to cost/lightweight/does not rust

non-toxic/does not corrode

(c) (i)

(ii)

M1 CnH2n

M1 double bond between two left hand end carbon

atoms

M2 single bond between each pair of rest of

carbon atoms

Penalise max 1 mark for any extra bond shown

letters other than n,e.g. x

Cn+H2

(d) M1 addition

M2 orange

M3 colourless

IGNOREclear/transparent/looks like water

additional

yellow/brown red, e

or in cany ot

(e) M1 saturated all (carbon to carbon) bonds aresingle

/contains only (carbon to carbon)

does not contain anymultiple/double bonds

Question

number

Answer Accept

5 (a) M1 (molecules/compounds/substances) with thesame

molecularformula/number of each type of

atoms

IGNORE chemical formula/same compound

M2 (but) different structural formulae/different

displayedformulae/different structures

hydrocarbons

atoms arrangeddifferently

elementgeneralformula/

formula

(b) D

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single bonds

M2 unsaturated - contains (carbon to carbon)double/multiple

bond(s)

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Questionnumber

Answer Accept

6 (a) (i)

(ii)

(iii)

(iv)

7

M1 solid

M2 black

M1(formula) HAt

M2(name) hydrogen astatide

M1 (astatine/it/At) is less reactive (than

iodine, I)IGNOREastatine is unreactive

M2 elements get less reactive with increasingatomic

number/as group is descended/the lowerthey are

in the group

very dark grey

AtH

astatine hydride

iodine is more reactive

reverse argument

Astatine (atom) has more(electron) shells/outer

shell of astatine is furtherfrom nucleus so attracts

an electron less readily

hydast

anyto iod

(b) (i)

(ii)

4 (1) (1) 2 (1)

(paper) turns white/bleaches

IGNOREturns red

multiples/halves

(litmus) turns colourless

(c) (i)

(ii)

(iii)

(iv)

acidIGNORE hydrogen ions/names of acids

to displace (all of) the bromine/ to react all ofthe bromide (ions)

Br2 + SO2 + 2H2O 2HBr + H2SO4

M1 all formulae correct

M2 balanced

2HBr + Cl2 Br2 + 2HCl

correct formula

bromine (an)ions forbromideto complete the reaction

multiples and halves

multiples and halves

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(d) M1 colourless

IGNOREclear/transparent/looks like water

M2 brown (solution) / (dark) grey/black

solid/precipitate

red-

brown/orange/orange-brown

red

Questionnumber

Answer Accept

7 (a) M1 (reactants) s aq

M2 (products) aq l g

capital letters

(b) (i)

(ii)

to prevent acid escaping/spraying out/spitting outIGNOREto prevent water escaping

C

solution/liquid/HCl

(c) (i)

(ii)

M1 A

M2 gas produced/collected more quickly /

experiment overin shorter time / (gradient of) line steeper

M2dep on M1

M1 0.1(0)

M2 volume of gas is half/40 80 = / 80 = 40x 2

M2 dep on M1

reaction is faster

Half the products areproduced

(d) (i)

(ii)

M1 & M2 -all points plotted to nearest gridline

deduct 1 mark

for each incorrect plot up to a max. of2

M3 suitable straight line of best fit (csq on

plotted points)(must be drawn with the aid of a ruler). Line

need not beextrapolated.

M1 as concentration increases rate increases

(show a ) positive correlatio

as one doubles the other

doubles/directly proportiona

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(iii)

M2 proportional / in proportion

M1 more ions/particles (in a given volume)IGNORE more reactants

M2 collide (successfully)

M3 more per second/more frequently

Must be reference to frequency or number of

collisionsper unit timeIGNORE greater chance of collision

for 2 marks

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Questionnumber

Answer Accept

8 (a) (i)

(ii)

(iii)

Impurities/chemicals/substances may affect thecolour/flame

IGNORE affect the result/test

colour can (easily) be seen (in a non-luminous

flame)IGNOREreferences to temperature

yellow/orange/gold(en)

a luminous flame may maskthe colour

any combination of the

acceptable colours, e.g.golden-yellow

(b) (i)

(ii)

(iii)

Li+and Ca2+

M1 ammonia/NH3

M2 (water is needed) to form hydroxideions/OH

M1 iron(III)/Fe3+

M2 ammonium/NH4+

If both names and formulae given both must be

correct

lithium and calcium/Li and

Ca

to form an alkali/an alkalinesolution/ammonium

hydroxideto dissolve the ammoniaammonia needs to be

aqueous

ferric

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Questionnumber

Answer Accept

9 (a) (i)

(ii)

(iii)

measuring cylinder

M1 44

M2 cm

3

M2 0.00044(0)

Mark csq on answer to (a)(ii)

answers in othercorrect units, e.g.0.044 dm3

ml

0.44 for 1 mark only

correct answer with no

working for 2 marks

0.0

(b) zinc because

M1 1 mol zinc reacts with 2 mol HCl

M2 only 0.005 mol of zinc are needed

M1is standalone

M2is dep on zinc given as being in excess

(c) (i)

(ii)

(rate) increases/faster reaction

no effect/same volume (of hydrogen) produced

less time for reaction

to take place

none/nochange

fas

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Questionnumber

Answer Accept

10 (a) any two from:

forward and backward reactions (still) occurring

concentrations/amounts of

reactants/products/componentsremain constant

rate of forward reaction = rate of reverse

reaction

IGNORE concentrations/amounts of reactants andproducts are

the sameIGNORE reaction is reversible/goes both ways,OWTTEIGNOREreferences to le Chatelier

both reactions (still)

occurring

stay the same in place of

remain constant

(b) (i)

(ii)

M1 (increase in temperature) decrease(s)

M2 (increase in pressure) increase(s)

M1 (forward) reaction is exothermic/gives outheat

OR

reverse reaction is endothermic/takes in heat

M2 fewer (gas) molecules/particles on right hand

side

OR fewer moles (of gas) on right hand side

IGNOREreferences to volumesIGNOREreferences to le Chateliers principle

IGNOREreferences to reverse reaction lowers thetemperatureIGNOREreferences to forward reaction reduces

the pressure

less/lower(s)/drop(s)/getssmaller

more/raise(s)/higher/getsbigger

reverse argument

shifts to side with fewer(gas) molecules/fewer moles(of gas)

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10 (c) (i)

(ii)

(iii)

(the position of) equilibrium is not

established/reached

M1 (the mixture of gases is) cooled

M2 ammonia liquefies / condenses

recycled / reused /recirculated

temperature is decreased

put (back) into the reaction

chamberused again (in the process)

(d) heat(ing) / energy costs would be higher yield (of ammonia) woulddecrease

(e) (i)

(ii)

M1 Mr(N2) = 28

M2 112 000 28 (= 4 000) / 112 000M1

M3 8 000 / M2x 2

1 200 / 15% of M3

28 anywhere in the calculation

112 28) x 2 = 8 for 2 marks

(112 000 14) x 2 = 16 000

for 2 marks

Correct final answer without

working for 3 marks

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Questionnumber

Answer Accept

11 (a) (produces) most heat/energy per gram / per unitmass

highest temperature rise per per unit mass

most energy for smallest num

grams / mass

(b) (produces) most heat/energy per mole/per

molecule /per amount

highest temperature rise per

per molecule

most energy for smallest nummoles / molecules / amount

(c) Any two from:

heat/energy losses (e.g. by convection, by

conduction, to air, to surroundings)

incomplete combustionevaporation of water

copper / can / beaker / thermometer

/apparatusabsorbs heat

flame moves around because of draughts

non-standard conditions

(d) (i)

(ii)

A

B

(e) M1 breaking bonds is endothermic / takes in

heat/energy

M2 making bonds is exothermic / gives out

heat/energy

M3 more heat/energy given out than taken in

more energy is given out whe

bonds are made than is takenwhen bonds are broken for 3

more energy is given out whebonds are made than when bare broken for 1 mark

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IGNOREreferences to numbers/strengths ofbonds

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