ZIMSEC O Level Chemistry Paper 1 November 2016

Question 1

The graph shows a cooling curve of a substance, P.

Section YZ represents

Aboiling.
Bliquefaction.
Cmelting.
Dsolidification.

Question 2

Which change of state represents sublimation?

Asolid $\rightarrow$ liquid
Bgas $\rightarrow$ liquid
Cliquid $\rightarrow$ gas
Dsolid $\rightarrow$ gas

Question 3

An amino acid has an R $_f$ value of 0.75.

Which of the components A, B, C or D in the chromatogram could be the amino acid?

Question 4

The table shows the boiling points of some gases present in the air.

On cooling the air, which gas will be the last to condense?

Aargon
Bcarbon dioxide
Cnitrogen
Doxygen

Question 5

The diagram shows the positions of some elements in the Periodic Table.

Which two elements are most likely to react together to form a covalent compound?

AP and Q
BR and T
CQ and R
DQ and S

Question 6

The ion of a non-metal has the symbol X $^{2-}$ .

What will be the formula of the compound formed when it reacts with aluminium?

AA $l_2$ X
BA $l$ X $_3$
CA $l_3$ X $_2$
DA $l_2$ X $_3$

Question 7

Which atom A, B, C or D forms an ion with a charge of

-2

Question 8

The molecular formula of the compound formed by phosphorus and hydrogen is

AP $_5$ H.
BPH $_3$ .
CP $_3$ H.
DPH $_5$ .

Question 9

What is the mass of potassium iodide, KI, needed to prepare 250 cm

^3

of 0.05 mol/dm

^3

potassium iodide solution?

A12.50 g
B8.30 g
C2.08 g
D0.01 g

Question 10

A volume of 25 cm $^3$ of 2.0 mol/dm $^3$ solution of sulphuric acid was transferred to a 250 cm $^3$ volumetric flask and made up to the mark.

How many moles of sulphuric acid ended up in the flask?

A0.050
B0.020
C0.200
D0.500

Question 11

The diagram shows the effect of adding substance X to a reaction.

What is the effect of X on the reaction?

AThe potential energy of the reaction increases.
BThe potential energy of the reaction remains constant.
CThe potential energy of the reaction decreases.
DThe rate of reaction decreases.

Question 13

What is the concentration of calcium chloride, CaC

l_{2(aq)}

, solution when 11.10 g are dissolved to form 250 cm

^3

of solution?

A0.400 mol/dm $^3$
B0.100 mol/dm $^3$
C0.025 mol/dm $^3$
D4.00 mol/dm $^3$

Question 14

The diagram shows a Liebig's condenser.

At which point does the cooling water enter the condenser?

Question 15

The combustion of ethane, C $_2$ H $_{6(g)}$ , in excess oxygen is shown by the equation

2C $_2$ H $_{6(g)}$ + 7O $_{2(g)}$ $\rightarrow$ 6H $_2$ O $_{(g)}$ + 4CO $_{2(g)}$ .

What volume of carbon dioxide is formed when 20 cm $^3$ of ethane is completely burnt?

A10 cm $^3$
B20 cm $^3$
C80 cm $^3$
D40 cm $^3$

Question 16

The nucleon number of the isotope of oxygen,

^{18}_{8}

O, is

A8.
B10.
C18.
D26.

Question 17

Which quantity is the same for one mole of ammonia, NH

_3

, and one mole of ammonium chloride, NH

_4

l

Avolume at s.t.p
Bnumber of protons
Cnumber of particles
Dvolume at r.t.p

Question 18

What is the ore from which aluminium is extracted?

AHaematite
BCryolite
CPyrites
DBauxite

Question 19

A drug, amphetamine, has the formula C $_9$ H $_{13}$ N.

The relative molecular mass, M $_r$ , of amphetamine is

A135.
B108.
C23.
D3.

Question 20

A portion of 5 g of marble chips was reacted with excess dilute sulphuric acid.

What would be the effect, on the initial rate and final mass of the product, of using powdered calcium carbonate instead of marble chips?

Ainitial rate increases, final mass less
Binitial rate increases, final mass remains the same
Cinitial rate decreases, final mass increases
Dinitial rate remains the same, final mass remains the same

Question 21

Which electronic configuration is correct for an element in Period 2 of the Periodic Table?

A1
B2,1
C2, 8, 1
D2, 8, 8, 1

Question 22

Large volumes of hydrogen and iodine are allowed to react until a dynamic equilibrium is established.

H $_{2(g)}$ + I $_{2(g)}$ $\rightleftharpoons$ 2HI $_{(g)}$

Which graph shows the correct information on changes of volume of gases for this reaction?

Question 23

The reaction between copper (II) oxide and hydrogen is an example of

Aan oxidation reaction.
Ba reduction reaction.
Ca neutralisation reaction.
Da displacement reaction.

Question 24

The graph shows a titration curve.

This curve can be produced by the titration of

ANaOH and HC $l$ .
BNH $_3$ and CH $_3$ COOH.
CNH $_3$ and HC $l$ .
DNaOH and CH $_3$ COOH.

Question 25

The scheme shows some reactions of a solution P.

Solution P could be

Aaluminium sulphate.
Biron (II) chloride.
Ccopper (II) sulphate.
Diron (III) chloride.

Question 26

Which pair of metals will produce the lowest voltage when used as electrodes in a simple cell?

Acopper and silver
Bmagnesium and silver
Cmagnesium and zinc
Dzinc and copper

Question 27

Which statement explains why pure iron is rarely found in nature?

Airon is very useful in the construction industry
Biron readily combines with oxygen to form an oxide
Ciron readily combines with carbon dioxide to form a carbonate
Diron readily combines with water to form an oxide

Question 28

Which process does not use oxygen?

Acombustion of fossil fuels
Boxidation of metals
Cphotosynthesis in plants
Drespiration in animals

Question 29

Why does graphite act as a lubricant?

AIt has a giant molecular structure.
BIt has a high melting point.
CIt contains delocalised electrons.
DIts atoms are in layers which slide over each other.

Question 30

The results of chemical tests carried out on a compound, Q, are shown.

What could be compound Q?

Question 31

Which is not a property of ethane?

Ahigh boiling point
Bgas at room temperature
Cinsoluble in water
Da non-conductor of electricity

Question 32

A gas, Y, does not decolourise bromine but burns in excess oxygen to give CO $_2$ and H $_2$ O.

What could be gas Y?

Aethane
Bethene
Cethanoic acid
Dethylethanoate

Question 33

The equation shows how an organic compound X is produced.

C $_2$ H $_4$ + H $_2$ O $\rightleftharpoons$ X

What is X?

ACH $_3$ CH $_2$ OH
BCH $_3$ CH $_3$
CCH $_3$ CO $_2$ H
DCH $_3$ CO $_2$ CH $_3$

Question 34

Which polymer is formed from the monomers shown?

Aterylene
Bstarch
Cnylon
Dpolythene

Question 35

The diagram shows the structure of an organic compound.

The symbol shown in the structure represents

Aan alkyl.
Ban amide.
Can ester.
Da peptide.

Question 36

What type of reaction occurs when ethanol is converted to ethanoic acid?

Areduction
Boxidation
Ccondensation
Ddehydration

Question 37

Which polymer is natural?

Anylon
Bpoly(ethene)
Cstarch
Dterylene

Question 38

Which solution reacts with ethanol to produce an ester?

Aaqueous ammonia
Bethanoic acid
Cethylethanoate
Dhydrochloric acid

Question 39

Which element is not present in protein molecules?

Acarbon
Bnitrogen
Chydrogen
Dchlorine

Question 40

The diagram shows the structure of a hydrocarbon.

The structure shown is an isomer of

Apropane
Bbutene
Cpropene
Dbutane