chemistry

1 what number of protons, neutrons and electrons are present in the ion **fe~"?
[mets | resons | atone
a 26 28 23
b 26 28 29
cc 29 25 23
d 29 25 26

2 for which hydrocarbon are the molecular and empirical formulae the same?
a_ butane
b_ ethane
c_pent-1-ene
d propane

3 which molecule does not have any 90° or 180° bond angles?
a c2he b co: c pfs d sf.

4 the following data are needed for this question.
nahco,(s) + hcl(aq) > nacl(aq) + h2o(i) + co(g) ah =-38.97kjmol'
na,co3(s) + 2hcl(aq) > 2nacl(aq) + h2o(i) + co(g) ah =-96.59kj mol"
on heating, sodium hydrogencarbonate decomposes as shown.
2nahco3(s) — nazco3(s) + h2o(i) + co2(g)
what is the enthalpy change for this decomposition?
a -57.62kjmol™
b -18.65kj mor
c 18.65kjmol"
d 57.62kjmol™

5 in the redox reaction shown, how do the oxidation states of vanadium and sulfur change?
vo," + so, > v* + so.
a +1 +3 0 -2
b +1 +3 +4 +6
cc +5 +3 0 -2
d +5 +3 +4 +6

6 the equation for the reaction between silver chloride and aqueous ammonia is shown.
agcl(s) + 2nh3(aq) = [ag(nhs)2]"(aq) + cl(aq)
what are the units of k, for this reaction?
a nounits b_ mol'dm® c moldm® d_ mol?dm®

8 astable ion ns’ has been produced by research chemists.
which structure is most likely to show the electron arrangement of this ion?
x yee eo |*
e x enuxne
a e@ n x n x n x n x n e
ee e xx ©
eo xee eo |*
e e
b snzenenenxeng
e e xx ©
ee, x x ee |”
e
c isneneneneng
x e e x
ee x ,@e@ xx *
e x e e
d on xnenxneng
e e ee

9 1.89 of water, heated to 227°c in a sealed container, turns to steam with a pressure of 200 kpa.
what is the approximate volume of the container?
a 9x 10“%m? b 2x 10°m° c 2m d 8x 10’m3

10 when the equation is correctly balanced, what is the value of c?
ac2h, + bh2o + ch* + 2mno, —» dc2hgq2 + emn*
a 3 b 4 cc 5 d 6

11 the main stage in the contact process is an equilibrium reaction.
2so, + o, = 2s0;
which row describes the effect of the named condition on the equilibrium yield?
| | presence of catalyst high pressure high temperature
a no effect on yield decreases yield increases yield
b no effect on yield increases yield decreases yield
cc increases yield decreases yield increases yield
d increases yield increases yield decreases yield

12 xand y are oxides of different period 3 elements.
if one mole of x is added to water, the solution formed is neutralised by exactly one mole of y.
what could be the identities of x and y?
p| x | |
a p4010 al2o3
b so3 al203
cc p4049 na2o
d so3 na2o

13 compound z is insoluble in water but soluble at low ph.
what could be compound z?
a barium carbonate
b barium chloride
c barium hydroxide
d barium sulfate

14 hot aqueous sodium hydroxide reacts with chlorine.
6naoh(aq) + 3cl2(g) > 5nacl(aq) + naclo3(aq) + 3h2o(i)
which statement is correct?
a_ the oxidation numbers of chlorine and hydrogen both change in the reaction.
b_ the oxidation numbers of chlorine in the products are —1 and +1.
c_ if the aqueous sodium hydroxide is cold the reaction produces nac1o instead of naclo3.
d sodium undergoes disproportionation in this reaction.

195 solid ammonium nitrate ts put into a test-tube and solution x is added to it. [he resulting mixture
is warmed and the gas given off is tested with damp red litmus paper. the litmus paper changes
colour from red to blue.

what could be the identity of x and its role in the reaction?
a naoh(aq) proton donor
b naoh(aq) proton acceptor
cc hcl(aq) proton donor
d hcl(aq) proton acceptor

16 sodium, magnesium and aluminium are three elements in period 3 of the periodic table. each
element forms an oxide.
which row is correct?
[[sesiumoie | magnesiomonie | atrium onde
a basic amphoteric amphoteric
b giant ionic giant ionic simple molecular
cc high melting point high melting point low melting point
d readily reacts with water slight reaction with water no reaction with water

17 a student investigates calcium nitrate crystals by heating them in the apparatus shown.
a colourless gas leaves the apparatus at y. a flame is held to this gas.
lighted splint
co, =| y
calcium nitrate
crystals | | it]
heat l | .
° water with a
° few drops of litmus
°
°
which observations would the student make?
a changes to blue flame burns more brightly
b changes to blue flame goes out
cc changes to red flame burns more brightly
d changes to red flame goes out

18 how does concentrated sulfuric acid behave when it reacts with sodium chloride?
a asanacid only
basan acid and oxidising agent
c_asan oxidising agent only
d  asareducing agent only

19 which statement about nitrogen or its compounds is correct?
a in the haber process the temperature is kept high to give a good equilibrium yield of
ammonia.
b_ nitrogen gas is unreactive because of the strong nitrogen—nitrogen double bond.
c_ nitrogen monoxide will react with carbon monoxide under suitable conditions.
d_ the formula of ammonium sulfate is nh4so,.

20 which pair of compounds are functional group isomers of each other?
a __ butan-1-ol and butanal
b_ ethylpropanoate and pentanoic acid
c_ hex-1-ene and hex-2-ene
d__propylamine and propanenitrile

21 which row identifies a suitable starting material and reagent that can be used to produce
butanenitrile?
[| sterinematerat [reagent |
a ch3ch2ch2br hcn
b ch3ch2ch2br nacn
cc ch3ch2ch2ch,br hcn
d ch3ch2ch2ch,br nacn

22 the diagram shows the structure of ethanedioic acid.
ho oh
\ 7
7
o (e)
ethanedioic acid reacts with ethanol in the presence of a few drops of concentrated sulfuric acid
to form a diester. the molecular formula of the diester is cgh10o,.
what is the structural formula of the diester?
a  ch3ch2co2co2ch2ch3
b ch3ch2,0coco,2ch2ch3
c chsch202,c02,cch2ch3
d ch3;co2ch2zch,0coch3;

23 the infrared spectrum shown was obtained from a compound j.
100
transmittance
50
0
4000 3000 2000 1500 1000 500
wavenumber/cm-'
which statement about j is correct?
a both c=o and cen are present.
b_ neither c=o nor cen are present.
c c=ois present but not c=n.
d_ cen is present but not c=o.

24 asection of a polymer chain is shown.
what is the correct monomer?
a b cc d

25 structural isomerism and stereoisomerism should be considered when answering this question.
how many non-cyclic isomers have the molecular formula c5h10?
a 3 b 4 cc 5 d 6

26 an excess of dry hbr is warmed with compound y.
y
oh
what is the major product of the reaction?
a b cc d
br

ho, ho, br

br br br

br
br br
br

27 which reaction would produce propanoic acid as one of its products?
a heating (ch3)s>c=chch2ch; with concentrated, acidified kmno,
b_ heating ch3ch2co2ch2ch2ch3 with naoh(aq)
c heating ch3;ch2oh with acidified k2cr2o7 under reflux
d_ reacting ch3cho with hcn then heating the organic product with h2so,(aq)

28 compound x is treated with an excess of lithium aluminium hydride. the reaction is allowed to go
to completion.
x
(e)
ieuur
oh
what is the structure of the organic product?
a b
0. 0.
iouul ou
h oh
cc d
ho ho
1iouur ioue
oh oh

29 what is the skeletal formula of the compound formed when ch3;ch=chch,oh is heated, under
reflux, with k2cr207/h*?
a b cc d
(e) (e) oh o oh o
oh oh

30 the diagram shows the structure of compound q.
q
(e)
kx)
" <7,
o
o
two of the rings, x and y, contain a c=c bond.
which row is correct?
number of ester groups description of
in one molecule of q rings x and y
a 1 both are planar
b 4 neither is planar
cc z both are planar
d 2 neither is planar

31 carbon and nitrogen are adjacent in the periodic table.
which properties do they both have?
1. there is an empty 2p orbital in each atom of the element.
2 the principal quantum number of the highest occupied orbital is 2.
3 they can form compounds in which their atoms form four bonds.

32 the strong hydrogen bonding present in liquid water causes an increase in which properties?
1 viscosity
2 boiling point
3 surface tension

33 a reaction between carbon and oxygen is shown.
c(s) + 30,(g) > coq)
how can the standard enthalpy change of this reaction be described correctly?
1 standard enthalpy change of formation
2. standard enthalpy change of combustion
3 standard enthalpy change of atomisation

34 hydrochloric acid reacts with zinc.
2hcl(aq) + zn(s) > zncl2(aq) + ho(g)
what will increase the rate of this reaction but will not change the boltzmann distribution of
molecular energies?
1 addition of a suitable catalyst
2 ~anincrease in concentration of hydrochloric acid
3. anincrease in temperature of hydrochloric acid

35 the element astatine, at, is below iodine in group 17 of the periodic table.
which statements concerning at are likely to be correct?
1 it is a dark-coloured solid at room temperature.
2 it is a more powerful oxidising agent than iodine.
3 its hydride is more thermally stable than hbr.

36 which statements are correct?
1 aluminium chloride dissolves in water to give an acidic solution.
2 magnesium chloride dissolves in water to give a solution of ph close to 7.
3 sodium chloride dissolves in water to give an alkaline solution.

37 ethanal and hydrogen cyanide react together. the reaction mechanism involves cyanide ions.
ch; nn h.c am, a; hc oh
‘ sf a 7
c=o —_—> cc h—cn —~ cc + 3cn
tk os #%
h scn- h cn h cn
which statements about this mechanism are correct?
1. cn acts as a catalyst.
2 cn is a nucleophile.
3 it is an addition reaction.

38 which compounds will produce a yellow precipitate with alkaline aqueous iodine?
1 2 3
oh
oh
oh

39 which statements apply to tetrafluoromethane?
1 it is rapidly decomposed by ultraviolet radiation.
2 it is less harmful to the ozone layer than dichlorodifluoromethane.
3. itis anon-polar molecule.

40 which statements comparing ethene and ethane are correct?
1 the bond angles in ethene are larger than the bond angles in ethane.
2 ethene reacts much more quickly with bromine in the dark than ethane does.
3 complete combustion of 0.01 mol of ethene or ethane produces the same volume of gas
measured at room temperature and pressure.

Solve 9701_m20_qp_12