chemistry

1. which statement about gases is correct?
a gases are difficult to compress when pressure is applied.
b_ the particles in gases are close together.
c_ the particles in gases have a random arrangement.
d_ the particles in gases move slowly past each other.

2 asample of argon gas is heated in a closed container.
which row describes what happens to the pressure and the size of the argon atoms?
[eee [ae
a decreases increases
b decreases stays the same
cc increases increases
d increases stays the same

3 which statement is correct?
a airis a mixture of gaseous elements only.
b_ alloys are formed when a metal is ionically bonded to other elements.
c carbon dioxide is a mixture of carbon and oxygen.
d_ potassium bromide is an ionic compound.

4 which row identifies methods of testing the purity of a compound?
([-metnaront [bar pit [ dronatonany |
a v v v
b v x x
cc v v x
d x v v

5 which row shows the number of protons, neutrons and electrons in the ion 1802"?
[ens [ estos [soos
a 10 8 8
b 8 10 8
cc 10 8 10
d 8 10 10

6 isotopes of the same element have some features that are the same and some that are different.
which row shows the features that are the same and those that are different?
nucleon proton number of
number number outer shell electrons
a / vv x key
b x v v /y =same
cc v x x x = different
d x x v

7 the electronic configurations of four atoms, w, x, y and z, are shown.
| tom | one
atom ‘ ;
configuration
www 2
xx 2,6
y 2,8,2
z 2,8,6
which atoms form an ion with a charge of 2— when they react?
a wandyy b wonly c xandz d_ y only

8 which statement about bonding is correct?
a_ allthe atoms in ch,, nh, and h,o molecules have noble gas electronic configurations.
b_ calcium chloride is a covalent molecule.
c_ group | metals gain electrons when they bond with group vii elements.
d_ oxide ions in calcium oxide are positively charged.

9 which statement about diamond is correct?
a_itis a giant covalent structure consisting of carbon atoms and each atom is bonded to
four other atoms.
b_itis a giant covalent structure consisting of flat sheets of carbon atoms.
c_itis a structure held together by ionic bonds and each ion is bonded to four other ions.
d_itis a structure held together by ionic bonds and each ion is bonded to three other ions.

10 which row shows the correct formulae of lead(ii) bromide and butane?
a pbbr, c,h,
b pbbr, cyhy9
cc pb,br c,h,
d pb,br cah,

11. calcium phosphate forms when calcium chloride and sodium phosphate solutions react together.
x cacl, + y na,po, > 2ca,(po,), + 12nacl

which values of x and y balance the equation?

pj «| |
a 2 2
b 3 4
cc 6 3
d 6 4

12 what is the definition of relative molecular mass, m,?
a itis the average mass of the isotopes in a compound.
b_itis the sum of the atomic numbers in a compound.
c_ itis the sum of the relative atomic masses in a compound.
d_itis the total number of atoms in a compound.

13 in an experiment, a molten compound is broken down using electricity.
which row identifies the negative electrode and the general name for the molten compound
being broken down?

neaative general name for
9 the molten

electrode

compound
a anode electrolysis
b anode electrolyte
cc cathode electrolyte
d cathode electrolysis

14 hydrogen—oxygen fuel cells can be used to power vehicles.
what is produced by the fuel cells?
1 carbon dioxide
2 electricity
3 water
a 1,2and3 b 1tand2only c 1and3only d 2and3only

15 three reactions are described.
1 an acid is added to substance h. rapid fizzing happens and the temperature
decreases.
2 when substance j is ignited, it produces large quantities of heat.
3 substance k reacts slowly with air and becomes warmer.
which reactions are endothermic?
a 1,2and3 b 1tand2only c_ 1 only d 2and3 only

16 which of the processes produces a physical change?
a thermal decomposition of calcium carbonate
b_ addition of sodium chloride to water
c addition of magnesium to hydrochloric acid
d combustion of sodium

17 aknown mass of gaseous ammonia and excess gaseous hydrogen chloride react together to

make solid ammonium chloride.

line x shows the total mass of ammonium chloride produced over time.

the reaction is repeated at a higher pressure. all other conditions are kept the same.

line y shows the total mass of ammonium chloride produced over time at the higher pressure.

which diagram is correct?

a b
x x
total mass of total mass of
ammonium ammonium y
chloride 4 chloride
produced/g produced/g
0 0
0 time/s 0 time/s
cc d
y y
total mass of total mass of
ammonium ammonium x
chloride x chloride
produced/g produced/g
0 0
0 time/s 0 time/s

18 the equation for the hydration of anhydrous copper(ii) sulfate is shown.
cuso, + 5h,0 — cuso,*5h,o
which colour change is observed in this reaction?
a blue to white
b_ white to blue
c pink to blue
d blue to pink

19 which of the reactions show the underlined substance being reduced?
1 cuo + h, > cu + h,o
2 2mg + o, > 2mgo
3 mgo + 2hcl — mgcl, + h,o
a 1and2 b 1only c 2and3 d 3only

20 four different solutions are separately tested with blue litmus and with methyl orange.
each solution is known to be either acidic or alkaline. the results are shown.
‘ result with result with
solution :
blue litmus methyl orange

1 red red

2 red yellow

3 blue yellow

4 blue yellow
which statement is correct?
a_ solutions 1 and 4 are acidic.
b_ solutions 1 and 2 are alkaline.
c_ solutions 3 and 4 are acidic.
d_ solutions 3 and 4 are alkaline.

21. which statement about sulfur dioxide or calcium oxide is correct?
a calcium oxide is an acid.
b- calcium oxide turns thymolphthalein yellow.
c sulfur dioxide is a base.
d sulfur dioxide turns thymolphthalein colourless.

22 which substances can be used to make pure crystals of sodium sulfate?
a_ potassium sulfate and sodium hydroxide
b_ sodium carbonate and sulfuric acid
c sodium nitrate and magnesium sulfate
d sulfuric acid and sodium chloride

23 which statements describe changes that occur from left to right across a period of the periodic
table?
1 the atomic number of the elements increases.
2 the metallic character of the elements decreases.
3 the physical state of the elements changes from gas to solid.
a 2only b 1and2 c 1tand3 d 2and3

24 part of the periodic table is shown.
which element is the most reactive non-metal?

l| [|
| | | [i i tt fel
| | | pt ttt
‘al tt tt tt et yy ee ty tt fet
eee ed eee
pet tt ett ttt ttt tt

25 analloy contains aluminium, copper, magnesium, manganese, silver and zirconium.
which row identifies the number of transition elements in the alloy and the relative density of
the transition elements compared to sodium?

number of relative density of
transition transition elements
elements in the compared to
alloy sodium
a 4 higher
b 4 lower
cc 5 higher
d 5 lower

26 which statement about the halogens and their compounds is correct?
a_ the colour of the element gets lighter going down group vii.
b_ the elements get less dense going down group vii.
c when chlorine is added to sodium iodide solution, iodine is formed.
d when iodine is added to sodium bromide solution, bromine is formed.

27 which row describes an element in group viii of the periodic table?
boiling point
| temaget | acts
a -107 diatomic
b -107 monatomic
cc 107 diatomic
d 107 monatomic

28 magnesium reacts with dilute hydrochloric acid.
which gas is given off in this reaction?
a carbon dioxide
b_ chlorine
c hydrogen
doxygen

29 which statement about aluminium is correct?
a_ aluminium is easy to extract from its ore because it is near the bottom of the reactivity
series.
b_~ aluminium is formed when aluminium oxide is heated with carbon.
c_ bauxite is an important ore of aluminium.
d hematite is an important ore of aluminium.

30 which statement shows that a liquid is pure water?
a_ it boils at 100 °c.
b_ it has a ph value of 7.
c_ it turns blue cobalt(ii chloride pink.
d_ it turns white copper(ii sulfate blue.

31 which compound can be added to ammonium sulfate to make an npk fertiliser?
a (nh,);po,
b kno,
c  k,po,
d co(nh,),

32 four gases found in air are listed.
1 carbon dioxide
2 carbon monoxide
3 methane
4 sulfur dioxide
which gases lead directly to global warming when their concentrations are increased?
a iand3 b 1and4 c 2and3 d 2and4

33 the structures of four organic compounds are shown.
1 2 3 4
ii i_| | i
ot 7 ani it et ©
h h h h oh h
which compounds are members of the same homologous series?
a 1,2and3 b 1tand2only c 1and3only d 3and4

34 which of the statements about propene are correct?
1 propene contains only single bonds.
2 propene decolourises aqueous bromine.
3  propene is obtained by cracking large alkanes.
4 propene is a hydrocarbon.
a 1,3 and4 b 1 only c 2,3 and4 d 2and4 only

35 petroleum is a mixture.
which method is used to separate petroleum into its components?
a chromatography
b_ cracking
c filtration
d fractional distillation

36 the equation for a reaction that produces ethanol is shown.
ethene + steam — ethanol
which type of reaction does the equation represent?
a addition
b combustion
c_ fermentation
d polymerisation

37 four statements about ethene or poly(ethene) are listed.
1 poly(ethene) is produced by an addition reaction.
2 ethene is a monomer.
3  poly(ethene) is a monomer.
4 poly(ethene) decolourises aqueous bromine.
which statements are correct?
a i1and2 b 1and3 c 2and4 d 3and4

38 sea water contains dissolved sodium chloride.
which method is used to obtain pure water from sea water?
a chromatography
b distillation
c_ evaporation
d filtration

39 which piece of apparatus is used to measure exactly 21.4 cm? of water?
a a25cm’ beaker
b a25cm° pipette
c a50cm’ burette
d a50cm* measuring cylinder

40 an aqueous solution of compound m is tested.
the results are shown.
*  alilac colour in a flame test
* awhite precipitate when tested with acidified barium nitrate
what is compound m?
a copper(ii) chloride
b_ copper(ii) sulfate
c_ potassium carbonate
d potassium sulfate

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