chemistry

1. which statement is correct?
a clhas a relative isotopic mass of 35.5.
b- cl, has a relative molecular mass of 70.
c_ iclhas a relative molecular mass of 162.4.
d  naclhas a relative molecular mass of 58.5.

2 strontium metal can be extracted trom strontium oxide, sro, by reduction with aluminium. one of
the possible reactions is shown.
6sro + 2al > 3sr + sr3al20¢6
what is the maximum mass of strontium metal that can be produced from the reduction of 100g
of strontium oxide using this reaction?
a 41.3g b 423g c 846g d 169.2g
oo ———————eoe—e—e—e—e—e—e—e—e—e——eee————— ___oeo_—v~ooo

3 a single “*p nucleus can be produced when a single ““s nucleus joins with particle x. in the
process a proton is emitted.
what is particle x?
a adeuteron, 4h"
banelectron
c aneutron
d  aproton

4 in which of the following, when in liquid form, are there only intermolecular forces based on
temporary dipoles between the particles?
a bromine
b_ ethanol
c hydrogen chloride
d_ water

5 copper has a high melting point.
what is the reason for the high melting point of copper?
a strong attractive forces between copper atoms only
b _ strong attractive forces between copper ions and delocalised electrons
c strong attractive forces between copper ions only
d strong attractive forces between copper atoms and delocalised electrons

6 = wnich pair of standard enthalpy changes are numerically equal¢
a_atomisation of ch,(g) and formation of ch,(g)
b combustion of ch3;oh(i) and combustion of graphite + 2(combustion of h2(g))
c combustion of graphite and formation of co2(g)
d neutralisation of hc/(aq) with naoh(aq) and formation of h20(i)

7 anenergy cycle is drawn for the following reaction.
br(l) + 3f2(g) > 2brf;3(l)
2br(g) + 6f(g)
o/ a
br,(l) + 3f,(g) ———————»> _ 2brf,,(i)

the standard enthalpy of formation of brf3(l) = —301 kj mol".
the enthalpy change of brf3(i) to brf3(g) is +44kj mol”.
what is the average bond energy of the br-f bond in brf3?
a 152kjmol' b 202kjmol' c 304kjmol' d 404kjmot"

8 in which reaction does the greatest change in the oxidation number of sulfur occur’?
a s(s) + o2(g) > so2(g)
b so,(g) + 302(g) =* sos(g)
c so3(g) + h2so,(l) > h2s207(l)
d  h2s20,(l) + h2o(i) > 2h2so,(i)

9 the first stage in the chloride process for the manufacture of titanium consists of the following
reaction.
2tio2 + 4clo + 3c > 2ticl, + 2co + coz

what is reduced in this reaction?

a carbon

b_ chlorine

c oxygen

d titanium

10 in aqueous solution, sulfuric acid dissociates as shown.
h,so, > hso, + h* this reaction goes to completion.
hso, = so,7 + h* this reaction reaches equilibrium with constant k,.
analysis of a 2.00 moldm~ solution of hsso, found the hso, concentration to be
1.988 mol dm.
what is k,?
a 1.381 x 10°dm* mol"
b  82.34dm*mol"'
c 1.214 x 10? moldm®
d 7.244 x 10° moldm®

11 an autocatalytic reaction is a reaction in which one of the products catalyses the reaction.
which curve would be obtained if the rate of an autocatalytic reaction is plotted against time?
a b cc d
rate | rate rate | rate ,
0 0 0 0
0 time 0 time 0) time 0) time

12 xand y are two elements in period 3 of the periodic table. they combine to form compound z.
x forms a soluble acidic oxide. the oxidation number of x in this oxide is +4.
y forms an amphoteric oxide.
what is the formula of compound z?
a aip b_ al2s3 c sinps d_ sis.

13 this question is about two elements in group 2, q and r.
three of the statements shown are correct for metal q.
the one remaining statement is correct for metal r.
which statement applies to r?
a_ a saturated solution of the hydroxide of this metal has the higher ph value.
b_ this metal has a carbonate that is used in agriculture to reduce the acidity of soil.
c_ this metal has the greater atomic radius.
d_ this metal reacts more quickly with cold water.

14 the electronic arrangement for atoms of four elements is given.
which element is the strongest oxidising agent?
a 1s?2s72p°
b 1s72s?2p°3s?
c  1s*2s?2p°3s73p°
d  1s72s72p°3s73p°4s?

15 astudent mixes pairs of chemicals together in separate test-tubes.
e excess calcium (s) + water (i)
e barium chloride (aq) + strontium hydroxide (aq)
e calcium carbonate (s) + excess hydrochloric acid (aq)
e magnesium sulfate (aq) + barium nitrate (aq)
how many of the mixtures produce a white, solid product?
a 0 b 1 cc 2 d 3

16 with which compound does concentrated sulfuric acid react both as a strong acid and as an
oxidising agent?
a magnesium carbonate
b_ potassium chloride
c sodium bromide
d © sulfur trioxide

17 ammonia can undergo an acid—base reaction with hydrogen chloride to form ammonium chloride.

which statement is correct?

a the ammonium ion is basic.

b_ the hydrogen atom from hci donates a lone pair of electrons to the nitrogen atom.

cc the h-n-h bond angle in ammonia is the same as the h—n-h bond angle in the ammonium
ion.

d the h—n-h bond angle in the ammonium ion is the same as the h-c-h bond angle in
methane.

18 what are the trends in the stated properties as group 2 is descended from magnesium to
barium?
decomposition
temperature of the first ionisation energy
carbonate
a decreases increases
b decreases decreases
cc increases increases
d increases decreases

19 sulfur dioxide, so2, reacts with calcium hydroxide in aqueous solution.
what is the main product that is first formed?
a ca(hso,)2 b cas c caso; d caso,

20 structural and stereoisomerism should be considered when answering this question.
compounds x, y and z are shown.
xx ni z
ho ho cl
cl cl oh
how many other isomers of c3h7c1o are there that are alcohols?
a 2 b 3 cc 4 d5

21 two students each make a statement about 2-methylbut-1-ene.
student 1 states that 2-methylbut-1-ene has geometrical isomers.
student 2 states that 2-methylbut-1-ene reacts with hbr in an addition reaction to give
1-bromo-2-methylbutane as the main product.
which students are correct?
a both 1 and 2
b= 1 only
c 2only
d_ neither 1 nor 2

22 which statement is correct when referring to the complete combustion of pvc?
a agas is made which contributes to global warming.
b carbon dioxide and water are the only products.
c_ if water is used to clean the exhaust gases, the water becomes alkaline.
d_ there is no need to treat the exhaust gases as the products are non-hazardous.

23 lodoethane, ch3chzi, reacts with aqueous silver nitrate at 50°c. a precipitate forms during this
reaction.
which row of the table is correct about this reaction?
| | type of organic reaction colour of precipitate
a electrophilic substitution cream
b electrophilic substitution yellow
cc nucleophilic substitution cream
d nucleophilic substitution yellow

24 a student converts 1-iodopropane, c3h7i, into butanoic acid, c;h7co2h, by a two-stage chemical
synthesis.
in the first of the two stages, which reagent is reacted with 1-iodopropane?
a aqueous sodium hydroxide
b_ ethanolic ammonia
c_ ethanolic potassium cyanide
d_ ethanolic sodium hydroxide

25 1-chloro-1-methylcyclohexane is hydrolysed by heating with naoh(aq).
om ce
+ oh > + cr
cl oh
the reaction pathway is shown.
energy sy
reaction pathway

one carbon atom in 1-chloro-1-methylcyclohexane is bonded to three other carbon atoms.
what is the charge on this carbon atom at point z?
a 1- b 5- c dt d 1+

26 an alcohol with the molecular formula cs5h;20 decolourises warm acidified potassium
manganate(vii). the alcohol also gives a yellow precipitate with alkaline aqueous iodine.
what could be the identity of the alcohol?
a 2-methylbutan-2-ol
b  3-methylbutan-2-ol
c_pentan-1-ol
d__pentan-3-ol

27 which pair of test results would prove that a substance, x, is a ketone?
a xhas no reaction with tollens’ reagent. x reacts with alkaline aqueous iodine.
b= xis reduced by lithium aluminium hydride. x is oxidised by acidified dichromate(v1).
c xreacts with 2,4-dnph reagent. x has no reaction with fehling’s reagent.
d_ xreacts with hydrogen cyanide. x is reduced by lithium aluminium hydride.

28 carvone is found in spearmint oil.
carvone
‘
which product is formed when carvone is reacted with nabh,?
a b cc d
oh o o oh

29 which compound is chiral and reacts with nazcq3 to give co2?
a b cc d
hco, ch, (oh re ch(br)co,h
c hco,ch |
| \ th
cc ch,
h~ co,h chs

30 the skeletal formula of compound x is shown.
compound x
ho.
ae
what is the molecular formula of compound x?
a cioh1go b  cioh290 c ci1h220 d  c14h240

31 nitrogen forms a number of oxides. their enthalpies of formation are given.

ah? [no(g)] = +90 kj mol
ah8[n20(g)] = +82 kd mol
ah8[no2(g)] = +33 kj mol

which statements are correct?

1 if n2o(g) is oxidised by o2(g) to no2(g), 16 kj is released per mole of n20.

2 the decomposition of n2o0(g) to n2(g) and o2(g) is exothermic.

3 the reaction between no and oxygen is exothermic.

32 which statements are correct?
1. enthalpy of combustion of hz = enthalpy of formation of h20
2 enthalpy of formation of h2 = —(enthalpy of atomisation of h2)
3 enthalpy of solution of hcl = enthalpy of hydration of h* + enthalpy of hydration of ci”
=

33 the units of k, for an equilibrium reaction are mol” dm”.
what could be the equation for the equilibrium?
1 a(aq) + biaq) = c(s) + d(aq)
2 p(aq) + q(aq) = raq)
3 w(aq) + 2x(aq) = y(aq) + z(aq)

34 methanol, ch3oh, can be produced industrially by reacting co with ho.
co(g) + 2h2(g) == ch3oh(g) ah = -91kj mo!"

the process can be carried out at 4 x 10°kpa and 1150k.

which statements about this reaction are correct?

1. increasing the temperature will increase the rate of reaction because more effective
collisions will occur.

2 lowering the temperature will reduce the rate of reaction because the forward reaction is
exothermic.

3 increasing the pressure will reduce the rate of reaction because there are a larger number of
moles on the left-hand side of the equation.

35 which rows correctly show the relative electrical conductivities of the sets of three period 3
elements?
greatest least
conductivity conductivity
sodium silicon chlorine
aluminium magnesium phosphorus
sulfur silicon phosphorus

36 three test-tubes, x, y and z, each contain water.
e asmall amount of naclis added to test-tube x.
e asmall amount of sicl, is added to test-tube y.
e asmall amount of alc13 is added to test-tube z.
after a short time, two drops of universal indicator solution are added to each test-tube.
which statements can be correct?
1 the ph in test-tube x is 7.
2 the ph in test-tube y is 2.
3. the ph in test-tube z is 2.

37 the structure of compound r is shown.
compound r
o
a aw
o
which statements about compound r are correct?
1 ithas an m, of 116.
2  \t contains two groups that show strong absorptions between 1640 and 1740cm" in its
infrared spectrum.

3 its only infrared absorption between 2500 and 3000cm" is sharp and strong.

38 during the bromination of methane, the free radical ch3* is generated. a possible termination
step of this reaction is the formation of czhg by the combination of two free radicals.
what could be produced in a termination step during the bromination of propane?
1. ch3ch2ch(ch3)ch2ch3
2 chsch(ch3)ch(chs3)2
3) =ch3ch2,ch2ch(chs)2

39 three reactions of primary alcohols are listed.
which reactions give water as one of the products?
1 reaction with ethanoic acid
2 reaction with concentrated hbr
3. passing the alcohol vapour over heated al,03

40 the diagram shows part of the structure of polymer x.
ch, h ch, h ch, h
oe ee

| haga, | hasan, | eer,

which reagents react with polymer x?

1 aqueous sulfuric acid

2 aqueous sodium hydroxide

3 sodium

Solve 9701_w20_qp_11