chemistry

1 which sample contains the same number of the named species as the number of molecules in
35.5g of chlorine?
a atoms in 16g of sulfur
b_ atoms in 23g of sodium
c_ ions in 74.5g of potassium chloride
d_ molecules in 88g of carbon dioxide

2 mixture r consists of one mole of c3hs and one mole of c4he.
what is the minimum number of moles of oxygen molecules needed for complete combustion of
mixture r?
a 65 b 7 cc 10 d 20

3 which statement about the electrons in a ground state carbon atom is correct?
a_ electrons are present in four different energy levels.
b_ there are more electrons in p orbitals than there are in s orbitals.
c_ the occupied orbital of highest energy is spherical.
d_ the occupied orbital of lowest energy is spherical.

4 for the element sulfur, which pair of ionisation energies has the largest difference between them?
a third and fourth ionisation energies
b fourth and fifth ionisation energies
c fifth and sixth ionisation energies
d - sixth and seventh ionisation energies

5 how many o bonds are present in one h-c=c—c(ch3)=ch(ch3) molecule?
a 5 b 11 cc 13 d 16

6 which molecule has an equal number of bonding electrons and lone-pair electrons?
a bh; b co: c f,0 d so,

7 the table shows properties of four solids held together by different types of bonding.
which row correctly describes the properties of a solid with a giant covalent structure?
fwalting pati solubility in
gp polar solvents

a high insoluble
b high soluble

cc low insoluble
d low soluble

8 the carbonate of an s-block element is reacted with an excess of hydrochloric acid.
0.833 g of the carbonate releases 200 cm? of gas, measured under room conditions.
what is the identity of the metal carbonate?

a nazco3 b  k.co3 c mgco; d caco;

9 the enthalpy changes of formation, ah, of both pc/3 and pcls are exothermic.
pcls reacts with chlorine.
pci3(l) + cl2(g) > pcls(s) ah ®xrction = —124 kj mol
which pair of statements is correct?
| | statement 1 statement 2
a ah? action is ess negative than the cl, bond energy is needed in calculating
ah? (pci,). ah ®eaction from enthalpies of formation.
b | am psction is more negative than the cl, bond energy is needed in calculating
ah (pc1,). ah ® action from enthalpies of formation.
cc ah ®. action is less negative than the cl, bond energy is not needed in calculating
ah? (pc1,). ah ®eaction from enthalpies of formation.
d | ah®. xction ss more negative than the cl, bond energy is not needed in calculating
ah§ (pci). ah ®, sction from enthalpies of formation.

10 a student mixes 25.0cm? of 0.350moldm~® sodium hydroxide solution with 25.0cm® of
0.350 moldm™ hydrochloric acid. the temperature increases by 2.5°c. no heat is lost to the
surroundings.

the final mixture has a specific heat capacity of 4.2j cm™°k™.
what is the molar enthalpy change for the reaction?

a ~-150kj mol"

b -60kj mol"

c -30kj mol"

d -0.15kjmol"

17 ammonium tons are converted into nitrate ions by bacteria.
what is the change in the oxidation number of nitrogen?
a -6 b +6 cc +8 d +9
eee . .qq8 eee

12 sodium dichromate(vi), nazcr207, reacts with hydrogen peroxide, h2o2, producing cr” ions,
water and oxygen.
what is the correctly balanced ionic equation for this reaction?
a cr07* + 2h* + h202 > 2cr** + 2h,0 + 40,
b  cr0;* + 8h* + 3h20, > 2cr** + 7h2o + 302
c cr,0,7 + 8h* + 6h,o, > 2cr* + 10h,o + 60,
d cro,;* + 14h* + 3h:o2 > 2cr** + 7h2o + 302

13 in which equilibrium reaction is the position of equilibrium moved to the right-hand side by
increasing the temperature and also by decreasing the pressure?
a h,(g) + co(g) = ho(g) + co(g) ah =40kjmol™
b  n2o,(g) = 2noz2(g) ah = 58kj mol
c 2s80,(g) + on(g) = 2s80,(g) ah = -197kj mol"
d 2hi(g) = h.(g) + i,(g) ah = —10 kj mol

14 ethanol is produced industrially by reacting ethene and steam.
c2ha(g) + h20(g) == c2hsoh(g)
kk, has a value of 1.8 x 10° and the partial pressures of the reactants at equilibrium are shown.
partial pressure
ethene 4.8 x 10°
steam 2.8 x 10°
which row is correct?
partial pressure
of ethanol at units of k,
equilibrium/kpa
a 2.42 x 10? kpa"
b 2.42 x 10° kpa
c 7.47 x 10" kpa‘
d 7.47 x 10" kpa

15 a large excess of magnesium ribbon is added to dilute hydrochloric acid and the volume of
hydrogen gas produced is measured as the reaction proceeds. the reaction is exothermic.
the results are shown.
r
total
volume
q
/cm®
p.
time/s
which row explains the changes in the rate of reaction between points p and q and between
points q and r?
| | between points p and q between points q and r
a the reaction temperature is increasing the acid concentration is falling
b the reaction temperature is increasing the magnesium has been used up
cc magnesium’s surface area is decreasing the acid concentration is falling
d magnesium’s surface area is decreasing the magnesium has been used up

16 measurements are made to determine the activation energy, e., of a reaction.
the diagram shows e, on the boltzmann distribution at temperature t,.
number of
molecules
0
0 be,
energy
measurements are then made at a higher temperature, to.
which diagram correctly shows the boltzmann distribution and e, at t2?
a b
number of number of
molecules molecules
0 0
0 e; 0 e,
energy energy
cc d
number of number of
molecules molecules
0 0
0 e, 0 e,
energy energy

17 the electrical conductivities of two compounds, y and z, are shown.
ee ae
conductivity of the compound good does not
in the liquid state conduct
conductivity of the mixture obtained good good
by adding the compound to water
what are compounds y and z?
p| vy | z |
a al,03 sicl,
b nacl al,03
cc nacl sicl,
d sicl, al203

18 which row describes the relative sizes of the ionic radii of na’, mg** and s*~?
[sates = ages |
a na* mg?* sz
b mg** na* s*
cc s* na* mg**
d s* mg”* na*

19 the oxides bao, cao, mgo and sro all produce alkaline solutions when added to water.
which oxide produces the saturated solution with the highest ph?
a bao b cao c mgo d ssro

20 = vvhicnh row is correct?
a
decompose group 2 metal nitrates group 2 sulfates
a decreases down the group decreases down the group
b decreases down the group increases down the group
cc increases down the group increases down the group
d increases down the group decreases down the group

21 which statement about group 17 elements and compounds is correct?
a_ sodium chloride produces chlorine when reacted with concentrated sulfuric acid.
b sodium chloride produces chlorine when reacted with bromine.
c sodium bromide produces bromine when reacted with concentrated sulfuric acid.
d sodium bromide produces bromine when reacted with iodine in aqueous potassium iodide.
i

22 chlorine is bubbled through 100cm*° of hot 4.0moldm™ sodium hydroxide until the reaction is
complete.
6naoh(aq) + xcl2(aq) > ynacl(aq) + znaclo3(aq) + 3h2o(i)
which row is correct?
5a [na*](aq) after
reaction/moldm-*

a 3 4.0

b 3 less than 4.0

cc 6 4.0

d 6 less than 4.0

23 which statement about ammonia or the ammonium ion is correct?
a ammonia gas is produced when an aqueous solution containing the ammonium ion is
reacted with a strong acid.
b silver iodide is soluble in a concentrated aqueous solution of ammonia.
c the ammonium ion has the same number of electrons as a methane molecule.
d_ the square planar ammonium ion contains a dative covalent bond.
gi — nn nn no

24 sulfur dioxide can be catalytically oxidised by an oxide of nitrogen in the atmosphere.
which reaction shows how the catalyst is reformed?
a no + 202 = 2no2
b 4nh3 + 50, > 4no + 6h20
c neo + o2 > 2no
d no + 40, > no;

25 separate 1.0g samples of na2o, mgo, al203, sio2, nacl, mgcls, alocl, and sicl, are added to
separate beakers containing water and stirred.
the number of beakers containing a white solid is q.
an excess of naoh(aq) is then added to each beaker and stirred.
the number of beakers now containing a white solid is r.
which row is correct?
| jf af re |
a 3 2
b 3 3
cc 4 3
d 4 4

26 which pair of alcohols are isomers of each other?
a _butan-1-ol and 2,2-dimethylpropan-1-ol
b_ butan-2-ol and 2-methylpropan-2-ol
c_pentan-1-ol and 2-methylpropan-2-ol
d_propan-2-ol and 2-methylpropan-2-ol

27 how many chiral carbon atoms are there in one molecule of 2,2,4,5-tetramethylhexan-3-ol?
a 1 b 2 cc 3 d 4

28 which pair of reagents react together in a redox reaction?
a ch3chch, + br2
b  ch3ch2ch2oh + concentrated h3po,
c ch3coch3 + hcn
d hco,c2hs + dilute h2so,

29 the structure of santonin is shown.
santonin
ch,
oo ch,
ch, o
(e)

santonin is first treated with warm dilute h2so,. the product of this reaction is treated with cold
dilute acidified kmno.. a final product, q, is obtained.
how many atoms of hydrogen in each molecule of product q will react with sodium metal?
a 2 b 4 cc 5 d 6

30 compound r can be formed from 1-bromopropane using a nucleophilic substitution reaction
followed by an oxidation reaction.
what is the identity of r?
a _propanoic acid
b_propanone
c_propylamine
d propyl ethanoate

31 three colourless liquids with the following formulae are contained in separate unlabelled bottles.
ch3ch2co2h ch3ch(oh)co2h ch3coco2h
which two tests, carried out on separate samples of each liquid, will successfully identify each
liquid?
[et ete
a nahco3 2,4-dnph reagent
b nahco3 tollens’ reagent
cc warm acidified dichromate 2,4-dnph reagent
d warm acidified dichromate tollens’ reagent

32 an alcohol, x, reacts with a dicarboxylic acid, y, to form a double ester, z.
the diagram shows the structure of the ester.
z
ah i i xl
which row about the reactants forming ester z is correct?
the class of the shape of
alcohol x the ring in y
a secondary non-planar
b secondary planar
cc tertiary non-planar
d tertiary planar

33 w reacts with alkaline i,(aq) to form a yellow precipitate and ch3;ch,co,. ions.
which row identifies w and the yellow precipitate?
[sea | la

a butanone chi,
b butanone chs3i
cc propanone chi3
d propanone chi

34 ethanal reacts with hydrogen cyanide in the presence of kcn to produce a hydroxynitrile.
what is the first step in the mechanism of this reaction?
a b cc d
6 6 6 5

in, c] c| =

ec cn ec ec ac
h,c~ h all sy ae alll sh he" “hh

2cn- ci

35 structural isomerism and stereoisomerism should be considered when answering this question.
how many isomeric compounds with molecular formula cshgo, contain two —co2h groups and
one c=c double bond?

a 5 b 6 cc 7 d 8

36 compound x reacts with ethanoic acid in the presence of an h* catalyst to produce the
compound shown.
o h 4h oo
sa + be
4d
what is the molecular formula of compound x?
a c2h,o b  c,h,o2 c cyhgo d c,4hgo2

37 2-bromopropane reacts with hot ethanolic sodium hydroxide.
which substance is the major product of this reaction?
a _propan-1-ol
b_propan-2-ol
c  2-hydroxypropene
d_propene

38 which compounds can be used to make y in a single-step reaction?
¥
oo
a
1 propanenitrile
2 ethanenitrile
3. propyl ethanoate
4 ethyl propanoate
a iand3 b 1and4 c 2and3 d 2and4

39 the monomer buta-1,3-diene can undergo addition polymerisation in various ways. two of the
polymers that can be made are called cis-poly(buta-1,3-diene) and trans-poly(buta-1,3-diene). in
these names cis and trans have their usual meanings.

what is the structure of the repeat unit of cis-poly(buta-1,3-diene)?
a b cc d
[~~ pay />\ lax
n n n n

40 in the mass spectrum of a compound, z, the relative abundances of the m and m+1 peaks are in
the ratio 13:1.
what is compound z?
a butyl butanoate
b hexan-3-one
c 2,2,3-trimethylhexane
d  3,3-dimethylpentan-1-ol

Solve 9701_w21_qp_12