chemistry

1 nitrogen is heated in a balloon, which expands slightly.
which statements about the molecules of nitrogen are correct?
1 they move further apart.
2 they move more quickly.
3 they remain the same distance apart.
4 their speed remains unchanged.
a iand2 b 1and4 c 2and3 d 3and4

2 the diagrams represent some elements, compounds and mixtures.
4 2 3 4
a % a @ % e*7% »e@e°®
ee ars eo e
°° oe 2 w e° 2 e@ @
which row describes the numbered substances?
a
a element mixture of compounds compound mixture of elements
b compound mixture of compounds element mixture of elements
cc element mixture of elements compound mixture of compounds
d compound mixture of elements element mixture of compounds

3 two atoms, x and y, have the same mass number but different atomic numbers.
which statement about x and y is correct?
a they have the same number of protons.
b_ they have the same number of electrons.
c_ they are in the same group of the periodic table.
d_ they have different numbers of neutrons.

4 the symbols for two different isotopes of element s are shown.
gs) as)
the letters m, n, p and q represent whole numbers.
which statements about the values of m,n, p and q are correct?
1 m=p
2 n=q
3 m>q
a 1,2and3 b iand2only c 1and3only d = 2and3 only

5 which statement about potassium fluoride is correct?
a it can conduct electricity when it is solid.
b it dissolves in water.
c_ ithas alow melting point.
d_itis a molecule.

6 in which molecule are all the outer-shell electrons involved in covalent bonding?
a cl, b ch, c hcl d nh;

7 whatis the formula of potassium oxide?
a p20 b po, cc ko d k,0o

8 the compound magnesium nitrate has the formula mg(nos3)2.
what is the relative formula mass of magnesium nitrate?
a 86 b 134 c 148 d 172

9 dilute sulfuric acid is electrolysed using inert electrodes.
what is produced at the anode?
a_ hydrogen
b oxygen
c - sulfur
d - sulfur dioxide

10 the flow diagram represents a hydrogen—oxygen fuel cell.
input 1 output 1
fuel
cell
input 2 output 2
which row shows the inputs and outputs?
a electricity electrolyte hydrogen oxygen
b electricity water hydrogen oxygen
cc fuel hydrogen water electricity
d fuel oxygen water electricity

11 which statement describes an exothermic reaction?

a_ thermal energy is transferred to the surroundings leading to a decrease in the temperature
of the surroundings.

b_ thermal energy is transferred to the surroundings leading to an increase in the temperature
of the surroundings.

c_ thermal energy is taken in from the surroundings leading to an increase in the temperature
of the surroundings.

d_ thermal energy is taken in from the surroundings leading to a decrease in the temperature
of the surroundings.

12 which row shows the changes that all increase the rate of a chemical reaction?
concentration 5 ‘
temperature particle size
of reactants
a decrease decrease decrease
b decrease increase increase
cc increase decrease increase
d increase increase decrease

13 a student heats hydrated copper(ii) sulfate. the blue crystals change to a white powder.
how can the student reverse this reaction?
a_ add anhydrous copper(ii) sulfate to the white powder.
b_ add water to the white powder.
c cool the white powder.
d_ reheat the white powder.

14 acidified aqueous potassium manganate(vij) is a purple solution.
what does the (vii) in the name potassium manganate(vii) represent?
a_ the charge on the potassium ion
b_ the charge of the manganate ion
c the number of ions in the compound
d_ the oxidation number of manganese

15 excess hydrochloric acid is added to aqueous sodium hydroxide containing thymolphthalein.
which colour change is observed?
a blue to colourless
b_ colourless to blue
cred to yellow
d yellow to red

16 information about four oxides, j, k, l and m, is listed.
j releases ammonia when added to aqueous ammonium chloride.
k reacts with aqueous sodium hydroxide.
lis the oxide of a group | element.
m is an oxide of an element in the top right section of the periodic table.
which row is correct?
[| cei ondes [basic odes
a jandk land m
b land m jandk
cc k and m jandl
d jandl k and m

17 three methods of preparing salts are listed.
1 acid + metal
2 acid + metal carbonate
3. acid + metal oxide
which methods can be used to make copper(ii) chloride?
a 1,2and3 b 1tand2only c 1and3only d = 2and3only

18 which set of elements shows the change from metallic to non-metallic character across a period
of the periodic table?
a _ beryllium — magnesium —> calcium
b fluorine + bromine —> iodine
c oxygen > boron > lithium
d sodium = silicon > chlorine

19 the diagram shows the reaction that occurs when potassium is dropped into water.
2k + 2h20 — 2koh + h2
- flame
water :
potassium
which row is correct?
density of ph of resulting

potassium solution
a high above 7
b high below 7
cc low above 7
d low below 7

20 which statement about bromine is correct?
a_ bromine has a greater density than chlorine.
b_ bromine is a gas at room temperature and pressure.
c_ bromine has a grey-black colour.
d_ bromine is less reactive than iodine.

21 what is a typical property of transition elements?
a canactas catalysts
b_ poor electrical conductivity
clow melting point
d_ low density

22 which description of elements in group viii of the periodic table is correct?
a they are diatomic.
b_ all atoms have eight outer electrons.
c_ they have high melting points.
d_ they are unreactive.

23 the flow chart shows some properties of four solid elements.
does it react with water
to produce hydrogen?
no yes
element 1
does it conduct electricity?
no yes
element 2
does it break into pieces
when struck with a hammer?
no yes
element 3 element 4
which elements are non-metals?
a 1and2 b iand3 c 2and4 d 3and4

24 which statement about copper or aluminium is correct?
a_ aluminium is more dense than copper.
b_~ aluminium is less reactive than copper.
c copper has high ductility.
d copper has poor electrical conductivity.

25 water from a reservoir flows to the water works where purification process 1 takes place followed
by process 2.
what are processes 1 and 2?
[yt pecesst[poess |
a chlorination filtration
b filtration chlorination
cc fractional distillation filtration
d filtration fractional distillation

26 calcium reacts with cold water to produce hydrogen.
lead reacts slowly when heated in air to form an oxide but has almost no reaction with steam.
silver does not react with either air or water.
zinc reacts when heated with steam to produce hydrogen.
what is the order of reactivity starting with the least reactive?
[[[eestieacne = estreaave|
a calcium lead zinc silver
b calcium zinc lead silver
cc silver lead zinc calcium
d silver zinc lead calcium

27 which statement about rusting is correct?
a_ rustis anhydrous iron(ii) oxide.
b oxygen is required for iron to rust.
c iron covered in grease rusts more quickly.
d iron rusts more quickly in the absence of air.

28 which statements about the extraction of iron in a blast furnace are correct?
1 the temperature inside the blast furnace is increased by burning carbon.
2 iron(iii) oxide is reduced to iron by carbon monoxide.
3 the thermal decomposition of calcium carbonate forms slag.
4 slag reacts with acidic impurities.
a iand2 b 1and4 c 2and3 d 3and4

29 which statements about water are correct?
1. tap water has fewer impurities than distilled water.
2 tap water will turn anhydrous cobalt(ii) chloride pink.
3 the domestic water supply is treated with carbon to kill microbes.
4 phosphates from fertilisers can cause deoxygenation of water.
a iand2 b 1and3 c 2and4 d 3and4

30 which substance is used by farmers to improve plant growth?
a ammonium nitrate
b_ phosphoric acid
c_ potassium
d_ sodium oxide

31. three air pollutants, x, y and z, are described.
x is a toxic gas formed by the incomplete combustion of an alkane.
y is formed by decomposing vegetation and increases global warming.
z is a cause of breathing problems and acid rain.
which pollutants are x, y and z?
ee ee
a carbon monoxide methane oxides of nitrogen
b carbon monoxide particulates carbon dioxide
cc sulfur dioxide methane oxides of nitrogen
d sulfur dioxide particulates carbon dioxide

32 the displayed formula of an organic compound is shown.
h h
* |
c==c—c—h
/ | |
h hh
to which homologous series does this compound belong?
a alcohols
b_ alkanes
c_ alkenes
d_ carboxylic acids

33 kerosene is one of the fractions of petroleum.
what is kerosene used for?
a jet fuel
b petrol
c_ road making
d waxes

34 a hydrocarbon p is cracked to make compound q and hydrogen.

compound r is formed by the addition polymerisation of compound q.
to which homologous series do p, q and r belong?
[atone [tare |

a p only qandr

b q only pandr

cc pandq r only

d pandr q only

35 which process involves combustion?
(some of the reaction products are not shown on the diagram.)
5
a
in water
d
° powers)

36 what are the products when ethanoic acid reacts with aqueous sodium hydroxide?
a carbon dioxide and water
b_ carbon dioxide and sodium ethanoate
c sodium ethanoate and hydrogen
d_ sodium ethanoate and water

37 which statements are correct?
1 the polymer of ethene is poly(ethane).
2 monomers are small molecules.
3 monomers join together to form polymers.
a iand3 b_ 1 only c 2and3 d = 2only

38 dilute hydrochloric acid is titrated into a conical flask containing sodium hydroxide solution and a
few drops of methyl orange indicator.
which piece of apparatus is used to add the hydrochloric acid?
a __ beaker
b_burette
c measuring cylinder
d pipette

39 what could be the melting point and boiling point of water containing a dissolved impurity?
|_| | ee
[°c [°c
a +3 96
b +3 104
cc -3 96
d -3 104

40 element x burns in air to form an acidic gas that decolourises potassium manganate(vii).
what is x?
a carbon
b_ nitrogen
c magnesium
d © sulfur

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