chemistry

1. agas is heated. the pressure is kept constant.
which statement describes the behaviour of the particles in the gas?
a_ the particles move faster and become closer together.
b_ the particles move faster and become further apart.
c_ the particles move more slowly and become closer together.
d_ the particles move more slowly and become further apart.

2  amixture of ice and water is left to stand and the ice melts.
which row describes what happens as the ice is melting?
temperature of aneray change
mixture gy 9
a increases average kinetic energy of particles decreases
b increases energy is used to overcome attractive forces
cc stays the same average kinetic energy of particles decreases
d stays the same energy is used to overcome attractive forces

3 hydrogen chloride gas [m,: hcj, 36.5] is released at p in the apparatus shown.
the universal indicator paper turns red after 38s.
le
universal
indicator paper
the experiment is repeated using sulfur dioxide gas [m,: so,, 64].
what is the result for sulfur dioxide gas?
universal time for
indicator universal indicator paper
paper turns to change colour/s
a blue 26
b blue 51
cc red 26
d red 51

4 four statements about atoms are listed.
1 the centre of an atom is positively charged.
2 protons and electrons are located in the nucleus.
3 protons and electrons have the same mass.
4 most of the mass of an atom is in the nucleus.
which statements are correct?
a 1and2 b 1and4 c 2and3 d 3and4

5 the electronic configurations of two elements are given.
element l: 2,8,8,1
element m: 2,8,4
which row identifies the group number and the period number for element l and element m?
ee
| soinninter [seiednanier | einai | pad ber
a | 4 iv 3
b | 4 ill 4
cc iv 1 ll 4
d iv 1 iv 3

6 which statement explains why isotopes of the same element have the same chemical properties?
a_ they have different numbers of protons in their nucleus.
b_ they have different numbers of neutrons in their nucleus.
c_ they have the same electronic configuration.
d_ they have the same number of electrons as protons.

7 which statements about potassium chloride are correct?
1 it conducts electricity when solid because its ions are free to move.
2  ithas a high melting point because it has strong intermolecular forces.
3 its structure is a giant lattice of alternating positive and negative ions.
4 itis soluble in water.
a iand2 b 1and4 c 2and3 d 3and4

8 how many electrons are shared in one molecule of nitrogen and in one molecule of ethene?
([atesen [ean
a 2 12
b 2 8
cc 6 12
d 6 8

9 what is the total number of electrons in one molecule of ammonia, nh,?
a 6 b 8 cc 10 d 11

10 when heated, copper(ii) oxide, cuo, reacts with ammonia, nh3.
3cuo + 2nh; > 3cu + n, + 3h,o
8.5g of ammonia reacts with an excess of copper(ii) oxide to produce 26.4 g of copper.
what is the percentage yield of copper in this reaction?
a 27.5% b 32.2% c 55.0% d 82.5%

11. what is the empirical formula of ethanoic acid?
a cho b ch,o c c,h,o d c,h,0,

12 magnesium chloride, mgcl,, contains magnesium ions and chloride ions.
how many chloride ions are present in two moles of magnesium chloride?
a 6.02 10”
b 1.204 x 10”
c 2.408 x 107
d 3.612 x 10™

13 a metal object is electroplated with copper.
one electrode is the metal object and the other electrode is copper. the electrolyte is aqueous
copper(ii) sulfate.
which row shows the ionic half-equation for the reaction at the anode and the observation of the
electrolyte?
a cu”* + 2e° — cu blue colour fades
b cu** + 2e = cu blue colour does not change
c cu — cu** + 2e blue colour fades
d cu > cu** + 2e7 blue colour does not change

14 which statement about electrolysis is correct?
a chemical energy is converted to electrical energy.
b_ electrons flow through the electrolyte.
c__lonic compounds are broken down.
d_ metals are formed at the positive electrode.

15 the reaction between hydrogen and oxygen releases 486 kj/mol of energy.
2h,(g) + o2(g) > 2h,o0(g)

the bond energy of h-h is 436 kj/mol and that of h—o is 464 kj/mol.
what is the bond energy of o=o?

a 430kj/mol

b  458kj/mol

c 498kj/mol

d 984kj/mol

16 which reaction pathway diagram shows the reaction that will give out the most energy?
the scale on the y-axis is the same in each diagram.
a b
reactants products
energy energy
products reactants
progress of reaction progress of reaction
cc d
products reactants
energy energy
reactants products
progress of reaction progress of reaction

17 when calcium carbonate is heated strongly, a gas is given off.
which word describes this change?
a_ chemical
b_ exothermic
c physical
d_ reduction

18 powdered magnesium carbonate is added to excess dilute hydrochloric acid.
the total volume of gas produced is measured over time.
a graph of the results is shown.
300 brer ren ree ees eee eee eee
ece e ee eee eee eee
peer eee cece ere eee
cocr ece sse eee errr
eere eee ece eee reer eee
ece eee ee cece eee
ece eee eee eee ere eee
bee e see ee oe eee ees eee eee
ece e ee ece ece
200=eeeeeeeeeeeeee eee eee eee
2 fp fp ff a po 0
a a a ff a a
total volume of ecceeeeeerreeeeeeeeceeeeeeeeeeeeeeeeeeh
gas produced/em? fccc eee eee eee ee eee
sss08y 400
a 51 a (a em im fe a i a
100-feegeeeeeeeeeeeeeeeeee eee eee eee
(a a a
et ed i i ki i i i gi i ce i i a a
sp 40
pia ttt eee
5 a a a a a el a a a a a
gen ee eee alae ea
dce ee ece ee eee
+i i el a ai a i a a a
0 resell psr eeaesaasssere lesser as rai
0 25 50 75 100 125 150 175 200
time/s
the experiment is repeated but the concentration of the hydrochloric acid is doubled.
all other conditions are kept the same.
which statements about the second experiment are correct?
1 the final volume of gas is 360 cm’.
2 the reaction finishes before 90 seconds.
3 the activation energy of the reaction is lower.
a iand2 b 1and3 c 2and3 d 2only

19 which statements explain why increasing the temperature changes the rate of a chemical reaction?
1 it increases the activation energy.
2  itincreases the frequency of collisions between the reacting particles.
3 it increases the kinetic energy of the reacting particles.
4 it increases the number of particles per unit volume.
a iand2 b 1and4 c 2and3 d 3and4

20 hydrogen is made by reacting carbon with steam. the equation for the reaction is shown.
c(s) + h,0(g) = h,(g) + co(g)
the forward reaction is endothermic.
which row describes changes in the pressure and the temperature that will both shift the position
of equilibrium to the right?
[sie [ere
a decrease decrease
b decrease increase
c increase decrease
d increase increase

21 which row shows the conditions used for the conversion of sulfur dioxide to sulfur trioxide in the
contact process?
[esietam tenpeeere [aie
a 250 200 vanadium(v) oxide
b 2 450 vanadium(v) oxide
cc 250 200 iron
d 2 450 iron

22 the equation for the reaction of magnesium with carbon dioxide is shown.
2mg + co, > 2mgo + c
which statement about this reaction is correct?
a magnesium is oxidised and carbon dioxide is reduced.
b_ magnesium is reduced and carbon dioxide is oxidised.
c magnesium and carbon dioxide are both oxidised.
d magnesium and carbon dioxide are neither oxidised nor reduced.

23 chlorine displaces bromine from aqueous potassium bromide.
the ionic equation for the reaction is shown.
cl, + 2br — 2cl + br,
which statement about this reaction is correct?
a_ bromide ions act as an oxidising agent.
b_ bromide ions are oxidised as electrons are lost.
c_ chlorine acts as a reducing agent.
d_ chlorine is reduced as electrons are lost.

24 which gas is produced when ammonium chloride is warmed with aqueous sodium hydroxide?
a ammonia
b_ chlorine
c hydrogen
d nitrogen

25 which equation represents a solution of ethanoic acid in water?
a hcooh(aq) = hcoo (aq) + h"(aq)
b hcooh(aq) > hcoo (aq) + h*(aq)
c ch,cooh(aq) = ch,;coo (aq) + h*(aq)
d ch,cooh(aq) > ch,;coo (aq) + h*(aq)

26 fourstatements about the reactions of oxides with dilute hydrochloric acid and with aqueous sodium
hydroxide are listed.
1 aluminium oxide reacts with both dilute hydrochloric acid and aqueous sodium
hydroxide.
2 calcium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide.
3  copper(id oxide reacts with dilute hydrochloric acid but not with aqueous sodium
hydroxide.
4 sulfur dioxide does not react with either dilute hydrochloric acid or aqueous sodium
hydroxide.
which statements are correct?
a iand2 b 1and3 c 2and4 d 3and4

27 which statement about elements in period 3 of the periodic table is correct?
a_ aluminium is a non-metal in group iii.
b_ argon is in group viii and has eight electrons in its outer electron shell.
c magnesium is in group ii and has three electrons in its outer electron shell.
d_ sulfur is a metal in group vi.

28 which row describes the structure of group vii elements and the trend in their reactivity down the
group?
structure reactivity down

group vii
a diatomic increases
b diatomic decreases
c monatomic increases
d monatomic decreases

29 some information about four elements, p, q, r and s, is shown.
melting point density colour of
in°c in g/cm® chloride
p 1247 7.43 pink
q 1410 2.33 white
r 1910 6.11 purple
$ 115 2.07 red
which elements are transition elements?
a pandr b pands c qandr d rands

30 propanoic acid is a carboxylic acid. it has similar chemical properties to ethanoic acid.
which statements are correct?
1 aqueous propanoic acid is a weaker acid than dilute hydrochloric acid.
2  propanoic acid partially ionises in aqueous solution.
3  propanoic acid reacts with ethanol to form propyl ethanoate.
a 1,2and3 b jiand2only c 1and3only d 2and3only

31 iron rusts in the presence of oxygen and water.
which statements about the rusting of iron are correct?
1 anhydrous iron(ii) oxide is produced when iron rusts.
2  lron rusts more quickly when attached to a piece of zinc.
3 coating the iron with plastic prevents the iron from rusting.
4 iron loses electrons when it rusts.
a iand2 b 1and4 c 2and3 d 3and4

32 an iron nail is added to aqueous copper(ii) sulfate and a different iron nail is added to aqueous
magnesium sulfate.
the results are shown.
iron nail in nail is coated with a brown solid
aqueous copper(ii) sulfate
iron nail in no reaction
aqueous magnesium sulfate
which statement is correct?
a copper atoms are oxidised more easily than magnesium atoms.
b copper atoms are reduced more easily than iron ions.
c iron atoms are oxidised more easily than copper atoms.
d iron atoms are reduced more easily than copper ions.

33 which pollutant leads to the deoxygenation of water in ponds and lakes?
a fertilisers containing nitrates and phosphates
b__ toxic metal compounds
c combustion products of fossil fuels
ds acid rain

34 which statement identifies a sample of water as pure?
a_ it melts at room temperature.
b_ it turns anhydrous copper(ii) sulfate blue.
c_ it turns hydrated cobalt(ii) chloride from blue to pink.
d_ it boils at 100°c.

35 oxides of nitrogen are produced by car engines.
in a catalytic converter oxides of nitrogen are removed by reacting them with compound x.
which row describes the type of reaction oxides of nitrogen undergo and identifies compound x?
a oxidation carbon dioxide
b oxidation carbon monoxide
cc reduction carbon dioxide
d reduction carbon monoxide

36 what is a disadvantage of producing ethanol using the catalytic addition of steam to ethene?
a the energy cost is low
b _ the process is continuous
c_ the process uses a non-renewable raw material
d the ethanol is pure

37 which statement about the polymer pet is correct?
a__itcan be broken down into its monomers and re-polymerised.
b_itis an addition polymer.
c_ itis a polyamide.
d_itis made from amino acid monomers.

38 the formulae of five compounds are listed.
1 c,hio
2 c,h,oh
3 c,h oh
4 c,h,cooh
5 c,h,,oh
which compounds are in the same homologous series?
a 1,3 and4
b 2,3and5
c 3and 4 only
d 3and65 only

39 propane reacts with chlorine.
which statements about this reaction are correct?
1 ultraviolet light is used to provide the activation energy.
2 propane undergoes an addition reaction.
3 one of the products is ch,;ch,cl.
4 one of the products is hcl.
a iand2 b 1and4 c 2and3 d 3and4

40 which statement about chromatography is correct?
a __itis not possible for two different substances to have the same r, value.
b _itis only possible to use chromatography on substances which have a colour.
c_itis possible to use chromatography on colourless substances using a locating agent.
d the r, value of a substance = a travelled by the solvent
the distance travelled by the substance

Solve 0620_s24_qp_21