chemistry

1 asample of a gas occupies 340 cm® at room temperature and pressure.
the temperature and pressure are both increased, but the volume occupied by the gas remains
340.cm*.
which row describes what happens to the particle speed and the average distance between the
particles in the gas when the temperature and pressure are both increased?
' average distance

| ranilble speed between particles

a unchanged unchanged

b unchanged increased

cc increased unchanged

d increased increased

2 which statements about the rate of diffusion of the gases ammonia, carbon monoxide, nitrogen
and oxygen are correct?
1 nitrogen and carbon monoxide will diffuse at the same rate.
2 oxygen will diffuse slowest because it is an element, whereas the others are
compounds.
3 ammonia will diffuse fastest.
a iand2 b 1and3 c 1only d 2and3

3. the structure of an atom of element x is shown.

key
e = electron
n = neutron
p = proton

what is element x?

a boron

b~ carbon

c_ sodium

d © sulfur

4 which statement explains why isotopes of an element have the same chemical reactions?
a they have different numbers of neutrons.
b_ they have ions with different numbers of electrons.
c_ they have the same number of outer shell electrons.
d_ they have the same number of protons.

5 magnesium reacts with oxygen to form magnesium oxide.
what happens to magnesium atoms and oxygen atoms during this reaction?
a magnesium and oxygen share two electrons.
b magnesium gains two electrons and oxygen loses two electrons.
c magnesium loses one electron and oxygen gains one electron.
d magnesium loses two electrons and oxygen gains two electrons.

6 which row about the properties of both diamond and silicon(iv) oxide is correct?
[| som, | ae
of electricity molecule
a yes giant covalent
b yes simple covalent
cc no giant covalent
d no simple covalent

7 the equation represents the reaction between solid magnesium oxide and dilute
hydrochloric acid to form magnesium chloride and water.
mgo + 2hci + mgcl, + h20

which row shows the state symbols for hydrochloric acid, magnesium chloride and water?
pf ner | wach, | ho

a (aq) (aq) (!)

b (aq) (!) (i)

c (!) (aq) (aq)

d (1) () (aq)

8 which substance is a mixture?
a. air
b_sgraphite
c oxygen
d_ water

9 the number of moles of atoms x, y and z, in a compound, are shown.
x 0.6
¥ 1.2
zz 0.3
what is the formula of the compound?
a xy2z4 b xy,z2 c xyz4 d xyz

10 1.0mol of silver nitrate, agnos, contains 1.2 x 10% ions.
how many ions are there in 0.25 mol of iron(ii) oxide, fe203?
a 15x10” b 3.0x 10% c 7.5.x 107 d 3.010%

11 concentrated aqueous magnesium bromide is electrolysed using carbon electrodes.
which equations represent the reactions occurring at each electrode?
| | positive electrode negative electrode
a 2br (aq) > bro(aq) + 2e7 2h*(aq) + 2e° — h2(g)
b 2h*(aq) + 2e° > h2(g) 20* (aq) > o2(aq) + 4e7
cc mg**(aq) + 2e° > mg(s) 2br (aq) > bro(aq) + 2e°
d 207 (aq) > o2(aq) + 4e7 mg”*(aq) + 2e° + mg(s)

12 aqueous copper(ii) sulfate is electrolysed using carbon electrodes.
which statement is correct?
a_ bubbles of hydrogen gas are formed at the anode.
b_ bubbles of oxygen gas are formed at the cathode.
c copper is deposited at the anode.
d_ the blue colour of the solution fades.

13 when water is added to anhydrous iron(ii) chloride, fecl3, hydrated iron(iii) chloride,
fec13*6h20, is formed and energy is given out.
fecl3 + 6h,o0 = fecl3*6h20
which reaction pathway diagram represents the formation of anhydrous iron(iii) chloride in the
reverse reaction?
a b
fecl,*6h,o fecl, + 6h,o
energy energy
fecl, + 6h,o fecl,*6h,o
progress of reaction progress of reaction
cc d
fecl, + 6h,o fec1,°6h,o
energy energy
fec1,°6h,o fecl, + 6h,o
progress of reaction progress of reaction

14 ethene reacts with hydrogen. the equation is shown.
coh, + h2 > cohe
the bond energies are shown.
bond energy
in kj/mol
cc-c +350
c=c +610
c-h +410
h-h +436
what is the energy change for the reaction?
a -560kj/mol b -124kj/mol c +486kj/mol d +5496 kj/mol

15 statements about four different acids are listed.
e a0.0100mol/dm’ solution of hydrochloric acid has a ph of 2.
e a0.0100mol/dm* solution of ethanoic acid has a ph of 3.4.
e hydrobromic acid, hbr, is a strong acid.
e  ethanoic acid is a slightly stronger acid than trimethylethanoic acid.
what are the ph values of 0.0100 mol/dm* hbr and 0.0100 mol/dm® trimethylethanoic acid?
ph of ph of 0.0100 mol/dm*
0.0100 mol/dm? hbr trimethylethanoic acid
a 2 3.3
b 2 3.5.
cc 3.4 3.3
d 3.4 35

16 anhydrous cobalt(ii) chloride is blue and turns pink when water is added.
how is this reaction reversed?
a__ adding dilute acid
b filtering
cheating
d_ cooling

17 the reaction between hydrogen and nitrogen is reversible.
the forward reaction is exothermic.
n2(g) + 3h2(g) = 2nh,(g)
which change to the conditions would increase the yield of ammonia?
a add acatalyst
b_ increase the pressure
c_ increase the temperature
d_ reduce the concentration of nitrogen

18 ethanol can be turned into ethanoic acid by passing it over hot copper(ii) oxide.
ch3ch2oh + 2cuo — ch3;cooh + h20 + 2cu
what is this type of reaction?
a precipitation
b_ redox
c_ thermal decomposition
d neutralisation

19 when heated strongly, silicon(iv) oxide reacts with carbon.
sio2 + 2c > si + 2co
which term describes what happens to silicon(iv) oxide?
a_ thermal decomposition
b neutralisation
c_ oxidation
d_ reduction

20 which statement about aqueous weak acids is correct?
a weak acids are always dilute aqueous solutions.
b_ weak acids dissociate fully in aqueous solution.
c when a weak acid is added to blue litmus paper, it stays blue.
d when a weak acid is added to solid magnesium, effervescence is seen.

21 which oxides are basic?
1 calcium oxide
2 sodium oxide
3 iron(ii) oxide
a 1,2and3 b 1tand2only c 2and3only' d_= 3only

22 zinc oxide is an amphoteric oxide.
zinc oxide is added to excess dilute hydrochloric acid.
zinc oxide is added to excess aqueous sodium hydroxide.
which row describes the observations made in these reactions?
excess dilute excess aqueous
hydrochloric acid sodium hydroxide
a colourless solution forms colourless solution forms
b colourless solution forms no visible change
cc fizzing colourless solution forms
d fizzing no visible change

23 which row shows properties of an element that is in the same group of the periodic table as
lithium?
electrical density
conductivity in g/cm?
a high 0.97
b high 8.93
cc low 0.07
d low 3.12

24 the elements in group vii include chlorine, bromine and iodine.
which statements are correct?
1 lodine is more dense than chlorine.
2 lodine displaces chlorine from a solution containing chloride ions.
3 bromine is a diatomic non-metal.
4 chlorine gas is darker in colour than bromine vapour.
a iand2 b 1and3 c 2and4 d 3and4

25 cobalt is a transition element.
what is a property of cobalt?
a_itcan form coloured compounds.
blt is a poor electrical conductor.
c_ithas a low density.
d_ it has a low melting point.

26 which metal has variable oxidation numbers?
a aluminium
b~ calcium
c copper
d_ sodium

27 which statement about alloys is correct?
a_ alloys are pure metal elements.
b_ atleast two or more metals react together to make alloys.
c_ alloys can be harder and stronger than a pure metal.
d_ steel is not an alloy because it can contain the non-metal carbon.

28 a metal m is between sodium and magnesium in the reactivity series.

which reactions occur with m and its oxide?

m can be extracted

m reacts with steam by heating its oxide

with carbon

a no no
b no yes
cc yes no
d yes yes

29 the diagrams show experiments to investigate rusting of iron nails.
1 2 2
' of oil
tap salt boiled
water water water
in which test-tubes do the nails rust?
a 1,2and3 b 1and2only c t1and3only' d = 1only

30 which equation represents a reaction that takes place when iron is extracted from its ore in the
blast furnace?
a cao + sioz > casio;
b cao + co2 + caco;
c 2co > c + co,
d 2fe + 3co2 — fe2co3; + 3co

31 some uses of water are listed.
1 for drinking
2 in chemical reactions
3. in swimming pools
4 in washing
for which uses is it necessary to chlorinate the water?
a iand2 b 1and3 c 2and4 d 3and4

32 oxides of nitrogen are formed in car engines and are a source of air pollution.
to decrease this pollution, catalytic converters are fitted to car exhausts.
what happens to the oxides of nitrogen in the catalytic converter?

a combustion
b_ cracking

c_ oxidation

d_ reduction

33 which pair of compounds are structural isomers of each other?
a ch3ch2ch3 and ch3ch2ch2ch3
b  ch2=chch3 and ch3ch=ch2
c ch(oh)ch2ch3 and ch3;ch2ch20h
d chsch2ch2cooh and ch3;cooch2ch3

34 methane reacts with chlorine in sunlight.
ch,4 + clz > ch3cl + hcl
which statements about this reaction are correct?
1 it is a substitution reaction.
2 itis an addition reaction.
3. it is a photochemical reaction.
4 it is catalysed by nickel.
a iand3 b 1and4 c 2and3 d 2and4

35 propene reacts with bromine to give one product only.
what is the formula of the product?
a ch3ch2chbrz2
b  ch2brch2ch,br
c ch3chbrch,br
d ch;ch2ch,br

36 ethanol can be manufactured by fermentation or by the catalytic addition of steam to ethene.
which statements describe an advantage of manufacturing ethanol by fermentation?
1 the yield of ethanol is low.
2 the method uses a batch process.
3 the process takes place at a lower temperature.
4 the ethanol is made from a renewable source.
a iand2 b 1and3 c 2and4 d 3and4

37 acompound with the formula ch3cooc;hs is formed from ethanol in two separate reactions.
reaction 1 ethanol reacts to form ethanoic acid.
reaction 2 ethanoic acid and ethanol react together to form ch3cooc2hs.
which row describes reaction 1 and reaction 2?
[| resciont | reoion?
a oxidation ester formation
b oxidation addition
cc reduction ester formation
d reduction addition

38 the flow diagram shows how poly(ethene) may be made from petroleum.
1 2 3
petroleum fuel oil ethene poly(ethene)
what are stages 1, 2 and 3?
ee ee
a cracking polymerisation fractional distillation
b cracking fractional distillation polymerisation
cc fractional distillation cracking polymerisation
d fractional distillation polymerisation cracking

39 rr; values are used to identify unknown substances using paper chromatography.
which statements about r; values are correct?
1  r, values are always less than 1.0.
2  r, value = distance travelled by solvent + distance travelled by unknown substance.
3. the higher the fr; value, the further the unknown substance travels.
4  r,values are not affected by the solubility of the unknown substance.
a iand2 b 1and3 c 2and3 d 3and4

40 the results of some tests on an aqueous solution of substance x are listed.
1. acream precipitate is produced when adding aqueous silver nitrate.
2 adding aqueous sodium hydroxide produces a green precipitate which dissolves in
excess alkali.
3 adding aqueous ammonia produces a green precipitate which is insoluble in excess
ammonia.
what is substance x?
a chromium(iii) bromide
b chromium(iii) chloride
c iron(ii) bromide
d _ iron(ii) chloride

Solve 0620_w23_qp_23