chemistry

1 x is animpure sample of a group 2 metal carbonate, mcos3. x contains 57% by mass of mcos.
the impurities in x do not react with hydrochloric acid.
7.4g of x is reacted with an excess of dilute hydrochloric acid.
0.050 mol of the group 2 metal chloride is produced.
what is the identity of the group 2 metal?
a mg b ca c sr d ba

2 which of these samples of gas contains the same number of atoms as 1g of hydrogen gas?
a 22g of carbon dioxide (m,: coz, 44)
b 8g of methane (m,: ch,, 16)
c 20g of neon (m,: ne, 20)
d 8g of ozone (m;: os, 48)

3 what is the total number of protons, neutrons and electrons present in an ammonium ion with a
relative formula mass of 21?
number number number
of protons of neutrons of electrons
a 11 10 10
b 10 11 11
cc 10 11 10
d 11 10 11

4 this question is about the first ionisation energies of magnesium and neon.
which row is correct?
first ionisation type of electron removed
a mg > ne p
b mg > ne s
cc ne > mg p
d ne > mg s

5 arsenic forms a compound with fluorine. in this compound, the arsenic atom has no lone pair of
electrons and there are no dative bonds.
selenium also forms a compound with fluorine. in this compound, the selenium atom has no lone
pair of electrons and there are no dative bonds.
in which compounds are there two different bond angles?
(in this question, 180° bond angles should be ignored.)
a both arsenic fluoride and selenium fluoride
b arsenic fluoride only
c selenium fluoride only
d_ neither arsenic fluoride nor selenium fluoride

6 asstructure for borazole, n3b3he, is shown.
borazole
h h
\ zé
b—n*
ex.
h—n* b—h
%
b==n*
/ *
h h
which shape is borazole and how many z electrons are there in the structure?
number of
shape
m electrons
a non-planar s
b non-planar 6
cc planar 3
d planar 6

7 the diagram shows the apparatus used to find the relative molecular mass of a volatile liquid.
when 0.10g of a volatile liquid is injected into the syringe, all of the volatile liquid evaporates and
the volume increases by 85cm’.

the heater maintains a temperature of 400k and the experiment is carried out at a pressure of
101 300 pa.
syringe
hatedtoe ae ttt
——k—k—x—x—
thermometer —

neater — uii
if the vapour of the volatile liquid behaves as an ideal gas, which expression can be used to
calculate the relative molecular mass of the liquid?
a m,= (85 x 101300) + (0.10 x 8.31 x 400)
b- m,=(85 x 101.3) + (0.10 x 8.31 x 400)
c m,=(0.10 x 8.31 x 400) + (85 x 10° x 101 300)
d m,=(0.10 x 8.31 x 400) + (85 x 10° x 101.3)

8 the table shows physical properties of four substances, w, x, y and z.
| ate | oe ss a
; ; conductivity | conductivity | conductivity
paint pein gs of solid of liquid in water
ww 993 1695 poor good good
x -119 39 poor poor insoluble
y¥ 1535 2750 good good insoluble
z 1610 2230 poor poor insoluble
what are the identities of w, x, y and z?
pf wf] x | vy | @ |
a mgo c2hsbr fe a1203
b mgo hcl k al,03
cc naf c2hsbr fe sioz
d naf hcl k sioz

9 the apparatus used to determine a value for the enthalpy of combustion of butan-1-ol is shown.
the mass of 1.00 cm® of water is 1.00 g.
thermometer
copper can y/
175cm* water
as sn in burner

initial mass of burner + butan-1-ol 58.34g

initial temperature of water 17.6°c

final mass of burner + butan-1-ol 57.85¢

final temperature of water 41.1°c
butan-1-ol m, = 74
which value, to three significant figures, for the enthalpy of combustion of butan-1-ol can be
calculated from these data?
a -114jmol*
b -17.2kjmol"'
c -2600kj mol"
d -4540kj mol"

10 in the high temperatures of car engines, nitrogen reacts with oxygen to produce
nitrogen monoxide.
4n(g) + 40.(g) > no(g) ah® = +90kj mol"
this reaction has activation energy e,.
which reaction pathway diagram correctly represents this reaction?
a b
e.\ no
1 1 5 1 1 )
energy 2n,(g) + 20,(9) fe energy 2n,(g) * 20,(9) pane
mpl \no®)
extent of reaction extent of reaction
cc d
no no
e (9) a (9)
energy 2n,(9) + 20,(g) _ fare energy 2n,(9) + 20,(g) oy yane
extent of reaction extent of reaction

11 in which reaction does the oxidation number of chlorine change by the largest amount?
a 2kc1o3 > 2kci + 302
b 2clo° > cl + clo.
c cl, + hx0 + hcl + hclo
d 2naclo, + cl, + 2nacl + 2c10,

12 hydrogen is produced industrially from methane as shown in the equation.
cha(g) + h2o(g) == co(g) + 3h2(g) ah® = +205kj mol

which conditions give the highest yield of hydrogen at equilibrium?
[ress | tomporatu |

a low high

b high low

cc high high

d low low

13. w moles of hno2 undergoes a disproportionation reaction to produce u moles of hno3 and
v moles of no.
e no other nitrogen containing product is produced.
e nitrogen is the only element oxidised or reduced.
what are the values of w, u and v?
ww u v
a 2 1 1
b 3 1 2
cc 5 3 2
d 5 1 4

14 gas x dissociates on heating to set up the following equilibrium.
x(g) = y(g) + 2z(9)
a quantity of gas x is heated at constant pressure, p, at a certain temperature. the equilibrium
partial pressure of gas x is found to be pe
what is the equilibrium constant, k,, at this temperature?
a &p b {2p cc 8p d qp

15 in the diagram, x is the boltzmann distribution for the energies of the particles in a reaction and
e,, is the activation energy for that reaction.
eno ex
number of
molecules
zz
xx
y
0
0 molecular energy
which statement is correct?
a egzis the activation energy at a higher temperature.
b- enzis the activation energy at a lower temperature.
cy is the boltzmann distribution at a lower temperature.
d_ zis the boltzmann distribution at a higher temperature.

16 magnesium, aluminium and silicon are elements in the periodic table. each element forms an

oxide.
which row is correct?
[eas 8

a basic amphoteric amphoteric

b giant ionic simple molecular giant ionic

cc high melting point high melting point low melting point

d | slight reaction with water | no reaction with water | no reaction with water

17 which statement correctly describes what happens when silicon tetrachloride is added to water?
a_ the sicl, dissolves to give a neutral solution only.
b_ the sicl, reacts to give an acidic solution only.
c_ the sicl, reacts to give a precipitate and an acidic solution.
d_ the sicl, reacts to give a precipitate and a neutral solution.

18 xand y are two elements from period 3 of the periodic table.
element x has a higher electrical conductivity than element y. element y has a higher melting
point than element x.
which formula is a compound formed from element x and element y?
a mgs b mg-si c nacl d- sicl,

19 asample consisting of 1.0 mol of anhydrous calcium nitrate is completely decomposed by strong
heating.
what is the total amount of gas produced in this reaction?
a 1.0mol b  2.0mol c 2.5mol d 3.0mol

20 steam is passed over heated magnesium to give compound j and hydrogen.
what is not a property of compound j?
a. lthas an m, of 40.3.
bsitis basic.
c_itis a white solid.
d_itis very soluble in water.

21 which statement is correct?
a_ hydrogen bromide reduces concentrated sulfuric acid to form sulfur dioxide gas.
b_ hydrogen bromide decomposes at a higher temperature than hydrogen chloride.
c when hydrogen bromide gas is shaken with aqueous silver nitrate a yellow precipitate is
formed.
d when hydrogen bromide gas is bubbled through aqueous iodine the solution becomes
colourless.

22 iclis made when cl» and i, react together.
clp + in = 2icl
icl reacts with water.
5icl + 3h20 > 5hci + hio3 + 21,
which row is correct?
oxidation number reaction occurring
of tin ic1 when ici reacts with h2o
a +1 the iodine atoms are oxidised to form iz
b +1 the iodine atoms are oxidised to form hio3
cc -1 the chlorine atoms are reduced to form hc1
d —1 the iodine atoms are oxidised to form hio3

23 nh,cl reacts with naoh in an aqueous solution.
which statement is correct?
a_ the reaction gives rise to two different polar product molecules.
b_ the bond angle in the nitrogen-containing species remains unchanged.
c the ammonium ion acts as a base.
d_ the oxidation state of nitrogen increases in the reaction.

24 what is produced when 60g of nitrogen monoxide reacts with an excess of carbon monoxide in a
catalytic converter?
a 12g of carbon and 92g of nitrogen dioxide
b 24g of carbon and 92g of nitrogen dioxide
c 88g of carbon dioxide and 28g of nitrogen
d 88g of carbon dioxide and 56g of nitrogen

25 which alkene shows geometric isomerism?
a ch,ch,ch,ch==ch,
b ch,ch,ch==chch,
c ch,ch,c==ch,
by,
d ch,ch==cch,
bn

26 what is the correct name of the major product of the reaction of hbr with 3-ethylhex-3-ene?
a 3-bromo-3-ethylhexane
b  3-bromo-4-ethylhexane
c 4-bromo-3-ethylhexane
d 4-bromo-4-ethylhexane

27 the alkane ch3ch2ch(chs)2 undergoes free radical substitution with chlorine. no c—c bonds
are broken in this reaction.
how many isomeric products, including positional and optical isomers, of molecular formula
cs5h,,cl can be formed?
a 4 b 5 c 6 d 7

28 what is involved in the mechanism of the reaction between aqueous naoh and 1-bromobutane?
a attack by a nucleophile on a carbon atom with a partial positive charge
b_heterolytic bond fission and attack by a nucleophile on a carbocation
c homolytic bond fission and attack by an electrophile on a carbanion
d homolytic bond fission and attack by a nucleophile on a carbocation

29 but-2-ene reacts with cold dilute acidified kmno, to give product x.
but-2-ene reacts with an excess of hot concentrated acidified kmno, to give product y.
which statement about x and y is correct?
a_ only one of x and y reacts with 2,4-dinitrophenylhydrazine.
b= xand y both react with sodium hydroxide.
c xand y both react with sodium metal.
dy reacts with lialh, to give x.

30 when heated with koh dissolved in ethanol, halogenoalkanes can undergo an elimination
reaction to form alkenes.
what are the possible elimination products when 2-bromobutane is heated with koh dissolved in
ethanol?
a ch3ch=chchs only
b  ch3ch2ch=ck; only
c chsch=chch3; and ch3ch2zch=ch>
d ch3ch=chch3 and chz==chch=ch,

31 chloroethane can be used to make sodium propanoate.
chloroethane — intermediate q — sodium propanoate
intermediate q is hydrolysed with boiling aqueous naoh to give sodium propanoate.
which reagent would produce intermediate q from chloroethane?
a_ concentrated ammonia solution
b_ dilute sulfuric acid
c hydrogen cyanide in water
d potassium cyanide in ethanol

32 four different alcohols are treated with alkaline i2(aq).
which row is correct?
[name ofacobot | fomule of produ
a butan-2-ol ch3coo and ch3ci3
b propan-1-ol ch3coo™ and chi3
cc propan-2-ol ch3coo™ and chi3
d butan-2-ol ch3ch2coo™ and ch3i

33 the m, of compound x is 88.
compound x is heated under reflux with an excess of acidified potassium dichromate(vi) to
produce compound y.
compound y reacts with compound x under suitable conditions to produce compound z. the m,
of compound z is 172.
what is compound x?
a ch3ch2,chohch2ch3
b  (chs)2,cohch2ch3
c (ch3)2chchohch3
d (chs3)s;cch20oh

34 butanedione, ch;cocochs, is a yellow liquid.
how does butanedione react with 2,4-dinitrophenylhydrazine reagent and fehling’s reagent?
[| 2eanivopneninyerecine | fehings
a positive positive
b positive negative
cc negative positive
d negative negative

35 which substance reacts with ethanoic acid to give the organic product with the highest m,?
a lithium aluminium hydride
b magnesium
c_ potassium carbonate
d_propan-2-ol

36 a sample of propyl ethanoate is hydrolysed by heating under reflux with aqueous naoh. the two
organic products of the hydrolysis are separated, purified and weighed.
out of the total mass of products obtained, what is the percentage by mass of each product?
a 32.4% and 67.6%
b 38.3% and 61.7%
c 42.3% and 57.7%
d 50.0% and 50.0%

37 which statement about pvc is correct?
a combustion products of pvc are very alkaline and harmful to breathe in.
b_ the empirical formula of pvc is the same as the empirical formula of the monomer.
c molecules of pvc are unsaturated.
d_ the repeat unit of pvc is (ch2cci,).

38 compound q reacts separately with hcn and nabh, under suitable conditions.
both reactions produce an organic product with a chiral centre.
what is compound q?
a butanone
b_ethanal
c _propanal
d_propanone

39 compound x has the following properties.
e when 0.20 mol of x undergoes complete combustion, 14.4dm* of carbon dioxide is
produced, measured under room conditions.
e x reacts with 2,4-dinitrophenylhydrazine reagent to give an orange crystalline
product.
e xdoes not give a yellow precipitate with alkaline i(aq).
what could be x?
a_hexan-3-one
b _propanal
c_propan-1-ol
d_propanone

40 asample of but-2-enoic acid, ch3ch=chcooh, is analysed using infrared spectroscopy.
the infrared spectrum shows a broad peak in the range 2500-3000 cm”.
bond | functional groups containing the bond ehataniel sit inital’ absei iia range
(in wavenumbers)/cm
hydroxy, ester 41040-1300
aromatic compound, alkene 1500-1680
c=o | amide 1640-1690
carbonyl, carboxyl 1670-1740
ester 1710-1750
o-h carboxyl 2500-3000
hydroxy 3200-3600
which bond is responsible for this peak?
a c=c b c=o cc c-o d o-h

Solve 9701_s24_qp_13