chemistry

1 what is the average oxidation number of sulfur in each compound?
[cats [nso |
a 4 2
b 4 4
cc 6 2
d 6 4

2  anore of manganese contains 4% by mass of mno2 and no other manganese compound.
which mass of manganese would be obtained from 1 tonne of this ore?
a 25.3kg b 40.0kg c 63.3kg d 632kg

3. which atomic orbitals are occupied in an atom of phosphorus?
a 1p2s2p b 2s2p2d c 2s2p3s d 2p3s3d

4 the structure of compound a is shown.
compound a
ch, (ch,
ch==ch—c==ch— c==ch—ch,oh
ce
some of the carbon atoms in compound a have a tetrahedral arrangement of bonds.
some of the carbon atoms in compound a have a trigonal planar arrangement of bonds.
how many carbon atoms are there of each type?
[[ettecrat [ional ana
a 5 12
b 8 8
cc 9 6
d 9 8

5 awhite powder is known to be a mixture of magnesium oxide and aluminium oxide.
100 cm? of 2moldm™~ naoh(aq) is just enough to dissolve the aluminium oxide in x grams of the
mixture.
the reaction is shown.
alz03 + 20h + 3h20 > 2ai(oh)4~
800 cm? of 2moldm™ hcl(aq) is just enough to dissolve all of the oxide in x grams of the mixture.
the reactions are shown.
al,o3 + 6h* > 2al%* + 3h,o
mgo + 2h* — mg* + h,0
how many moles of each oxide are present in x grams of the mixture?
oxide oxide

a 0.05 0.25

b 0.05 0.50

cc 0.10 0.25

d 0.10 0.50

6 a graph of pv against t is shown for a fixed mass of gas. (p = pressure, v = volume and
t = temperature in k.)
pv so
t
which gas gives this graph over the widest range of temperatures and pressures?
a hydrogen, h2
b hydrogen chloride, hc
c hydrogen fluoride, hf
doxygen, o2

7 a weather balloon is filled with 12.0kg helium. the weather balloon reaches a height of 20km,
the pressure inside the balloon is 6000 pa and the temperature is 216 k.
what is the volume of the weather balloon at this height, correct to three significant figures?
a 897dm° b 1790dm* c 897000dm* d_ 1790000 dm®

8 which pair of enthalpy changes will always share the same sign (i.e. both are always exothermic
or both are always endothermic)?
a_ enthalpy change of atomisation and enthalpy change of neutralisation
b_ enthalpy change of atomisation and enthalpy change of solution
c_ enthalpy change of combustion and enthalpy change of hydration
d_ enthalpy change of solution and enthalpy change of hydration

9 chlorine dioxide, c1o2, reacts with sodium hydroxide in the reaction shown.
2c10, + 20h — clo, + clo; + ho
which statement correctly describes this redox reaction?
a_ chlorine atoms are oxidised and oxygen atoms are reduced.
b_ chlorine atoms are reduced and oxygen atoms are oxidised.
c some chlorine atoms are oxidised and some chlorine atoms are reduced.
d some oxygen atoms are oxidised and some oxygen atoms are reduced.

10 sulfur dioxide and oxygen react to form sulfur trioxide. the reaction is reversible.
2s0,(g) + o2(g) == 2803(g) kp = 2.96 x 10° pa at 700°c
the reaction is allowed to reach equilibrium at 700°c. the partial pressure of o2(g) is 375kpa
and the partial pressure of so3(g) is 20.3 kpa.
what is the partial pressure of so2(g)?
a 19.3kpa b 609kpa c 18300kpa d 609000kpa

11 ammonia is made by the haber process. the reactants are nitrogen and hydrogen.
no(g) + 3h2(g) == 2nh3(g) ah is negative
what will increase the rate of the forward reaction?
a adding argon to the mixture but keeping the total volume constant
b_ decreasing the temperature
c increasing the total pressure by reducing the total volume at constant temperature
d removing ammonia as it is made but keeping the total volume of the mixture the same

12 element x, in period 3, has the following properties.
e its oxide has a giant structure.
e it forms covalent bonds with chlorine.
e its oxide will neutralise hc1(aq).
what is element x?
a mg b al cc si d p

13 which row could refer to barium metal and barium hydroxide?
colour seen ph of a saturated
when the metal solution of
is burnt in o2 the hydroxide
a green flame 8
b green flame 13
cc white flame 8
d white flame 13

14 agno,(aq) is added to a solution of a halide ion, x (aq), and aqueous ammonia is then added.
the ionic equations for the two reactions that occur are shown.
ag*(aq) + x (aq) = agx(s) equilibrium 1

ag*(aq) + 2nh3(aq) == ag(nhs)2"(aq) equilibrium 2
which statement is correct?
a the position of equilibrium 1 lies to the left when x =t.
b iia the concentration of ammonia causes the position of equilibrium 1 to move to the

eft.

c.k, for equilibrium 2 is larger when x = cl’ than when x =t-.
d equilibrium 2 is a redox reaction.

15 water and ammonia take part in a reaction that produces the ammonium ion.
which statement about this reaction is correct?
a the ammonia molecule and the ammonium ion do not have dipole moments.
b_ the bond angle changes from 109.5° in the ammonia molecule to 107° in the ammonium ion.
c_ the reaction is a redox reaction.
d_ the water is acting as an acid.

16 due to their similar ionic radii, the reactions of lithium and magnesium and their corresponding
compounds are very similar.
which statement about the reactions of lithium or its compounds can be predicted from this
statement?
a lithium burns very slowly in oxygen.
b_ lithium carbonate decomposes on heating in a blue bunsen burner flame, forming lithium
oxide and carbon dioxide.
c lithium nitrate decomposes on heating, forming lithium nitrite, lino2, and oxygen.
d lithium reacts very violently with cold water, producing hydrogen.

17 which statement about group 17 elements and their compounds is correct?
a chlorine reacts with cold concentrated sodium hydroxide to form nacl and nac1lo3.
b_ hclis more thermally stable than hbr because chlorine is less electronegative than bromine.
c __lodide ions are oxidised to iodine by concentrated sulfuric acid.
d_ silver iodide is soluble in dilute aqueous ammonia.

18 which substance, when warmed with aqueous ammonium chloride, would produce an alkaline
gas?
a ch3co2h b  ch3ch20h c ch3;co2,ch3; d ch3ch2,0na

19 compound x is the oxide of a period 3 element. compound x reacts with water to give an acidic
solution.
a solution is prepared by reacting 0.100g of compound x with an excess of water. this solution is
neutralised by exactly 25.0 cm? of 0.100 moldm™ sodium hydroxide solution.
what could be the identity of compound x?
a al203 b mgo c p4040 d sos;

20 [he unsaturated hydrocarbon octa-1,3,5, /-tetraene, cghi9, can display geometric isomerism.
octa-1,3,5,7-tetraene
ch2=chch=chch=chch=ch2
how many isomers exist?
a 2 b 3 cc 4 d 8

21 what is the correct name for the compound shown?
ae
a §1,2,2-trimethylbutan-3-ol
b 2-ethyl-2-methylbutan-2-ol
c  3,3-dimethylpentan-2-ol
d 4-hydroxy-3,3-dimethylpentane

22 a polymer has the following repeat unit. it is made from two different monomers.
+{ch,-chci-ch,-ch=ch-ch,}
which pair of monomers could be used to make this polymer?
a ch2=chcl and ch2=ch2
b  ch2=chci and ch2==ch—ch=ch2
c ch3;—ch,cl and ch;3-ch=ch-ch;
d ch;-ch=ch-ch3 and ch2=chc1

23 compound x contains two functional groups.
compound x
oo
cn, —¢—cho
which reagent will react with only one of the functional groups?
a acidified potassium dichromate(vi)
b  2,4-dnph reagent
c hydrogen cyanide
d nabh,

24 ethanol can be converted into ethene in a single reaction.
ethanol can be converted into bromoethane in a single reaction.
under standard laboratory conditions, is a catalyst used in these reactions?
| | ethanol to ethene ethanol to bromoethane
a yes yes
b yes no
cc no yes
d no no

25 diols in which both hydroxy groups are bonded to the same carbon atom can spontaneously
eliminate a molecule of water to produce a carbonyl compound.
which compound, after complete hydrolysis, gives a silver mirror with tollens’ reagent?
a 1,1-dibromobutane
b1,2-dibromobutane
c  1,3-dibromobutane
d  2,2-dibromobutane

26 which alcohol will give a yellow precipitate when warmed with alkaline aqueous iodine?
a (ch3)2chch2oh
b  (chs)3coh
c chsch2c(oh)(chs)2
d chs3ch(oh)ch2ch3

27 how many structural isomers are there of molecular formula csh;.o that give a red precipitate
with fehling’s solution?
a 1 b 2 cc 3 d 4

28 which statement about the use of alkane fuels in internal combustion engines is correct?
a cghig is used as fuel in internal combustion engines and reacts with oxygen and nitrogen
from the air.
b in limited oxygen, co is produced which oxidises so2 to so; in the atmosphere.
c_ the catalytic converter removes polluting gases including no2 and coz.
d  unburnt hydrocarbons and no, can react in sunlight to produce photochemical smog.

29 compound z is shown.
compound z
ho co,h
(e)
ho oa
oh
what is produced in good yield when compound z is treated with an excess of sodium carbonate
solution at room temperature?
a b
ho co,na nao co,na
o o
ho ka na’ pka
oh ona
cc d
naoq co,h ho co,na
oo [e)
joa , ja
nao o ho oh ho
ona oh

30 the infra-red spectrum shown was obtained from compound g.
100
transmittance
1% 50
0
4000 3000 2000 1500 1000 500
wavenumber/cm™*
what could be compound g?
a ch3;coch20h
b  ch3;ch,co.h
c ch3co2ch3
d ch3;chchchs;

31 the symbol for a phosphorus ion is j;p* .
the symbol for a potassium ion is 3{k*.
what do these two ions have in common?
1 the same number of electrons
2 the same number of neutrons
3 the same number of protons

32 the repeat unit of a polymer is shown.
oe
if
h  co,c.h; |,
which types of intermolecular forces exist in the solid polymer?
1. temporary dipole — induced dipole interactions
2 permanent dipole — permanent dipole interactions
3. hydrogen bonds

33 the diagram illustrates the enthalpy changes of a set of reactions.
ah = -134kj mol
r ———————s s
| | ah = +92kj mol"
ah = -75kj mol"
t ————— u
which statements are correct?
1 the enthalpy change for the transformation u — r is +42kj mol".
2 the enthalpy change for the transformation t > s is endothermic.
3. the enthalpy change for the transformation r > t is —33kj mol".

34 which statements about a reaction that has reached dynamic equilibrium are correct?
1 the rate of the forward reaction equals the rate of the reverse reaction.
2 there is no overall change in the concentrations of reactants and products.
3. there is no change in the measurable properties of the system.

35 group 2 elements and their compounds show trends in their physical and chemical properties.
barium is above radium in group 2 of the periodic table.
which statements are likely to be correct?
1 barium hydroxide is less soluble than radium hydroxide.
2 barium reacts less vigorously with water than radium does.
3 barium sulfate is more soluble than radium sulfate.

36 which statements are correct?
1. the empirical formula of silicon(iv) oxide is sioz.
2 the molecular formula of phosphorus(v) oxide is p2os.
3 silicon(iv) oxide and phosphorus(v) oxide are both simple molecular compounds.

37 which reagents could be used, under suitable conditions, to oxidise ch3ch2ch20oh to
ch3ch2cho?
1 acidified potassium manganate(vii)
2 acidified potassium dichromate(v1)
3. tollens’ reagent

38 which free radicals can be generated during a free-radical substitution reaction between chlorine
and ethane?
1. ch:
2 ch2cich2*
3. ch3cclo*

39 which substances have molecular formula c4hs0?
ana
(6)
2 ang
oh
3 pp .

40 which reactions produce pentanoic acid?
1. ch3ch,ch2ch(oh)ch3 + h*/mno, (aq)
2 ch30co(ch2)3ch3 + hcl(aq)
3 ch3(ch2)3cn + h2so,(aq)

Solve 9701_w19_qp_13