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ZIMSEC O Level · 5071/1 · N2015

Chemistry Paper 1 November 2015

Questions
40
Time allowed
60 min
Syllabus code
5071/1

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Questions
40
Pass mark
24
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Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Separation techniques
Which process involves a change of state?
  1. Afiltration
  2. Bchromatography
  3. Csublimation
  4. Ddiffusion

Question 2

Particulate nature of matter
When liquid water changes into steam, the molecules
  1. Abreak up into small particles.
  2. Bbecome very large.
  3. Cmove further apart.
  4. Dgive out heat energy.

Question 3

Experimental techniques
Which apparatus would be most suitable for measuring 16.75 cm3^3 of a liquid?
  1. Aa bulb pipette
  2. Ba burette
  3. Ca measuring cylinder
  4. Da volumetric flask

Question 4

Chromatography

The diagram shows a chromatogram of the dyes present in five different inks.

What is the total number of different dyes in all the five inks?

  1. A3
  2. B4
  3. C5
  4. D11

Question 5

Chromatography
Which property allows substances to be separated by paper chromatography?
  1. Adifferent solubilities
  2. Bdifferent colours
  3. Cequal solubilities
  4. Ddifferent boiling points

Question 6

Distillation

The diagram shows the distillation of a salt solution.

At which point would the temperature be equal to the boiling point of water?

  1. AA
  2. BB
  3. CC
  4. DD

Question 7

Graphite conducts electricity because
  1. Ait contains electrons that are free to move.
  2. Bit contains protons that are free to move.
  3. Cthe layers of atoms can slide over each other.
  4. Dit contains impurities.

Question 8

Periodic Table
Elements are systematically arranged in the Periodic Table in the order of increasing
  1. Anucleon number.
  2. Bproton number.
  3. Cvalency number.
  4. Dnumber of neutrons.

Question 9

Atomic structure
Which pair of atoms has the same number of neutrons?
  1. A715^{15}_{7}N and 714^{14}_{7}N
  2. B1123^{23}_{11}Na and 1223^{23}_{12}Mg
  3. C614^{14}_{6}C and 816^{16}_{8}O
  4. D92235^{235}_{92}U and 92238^{238}_{92}U

Question 10

Atomic structure

The structure of an atom is shown.

Which statement about this atom is correct?

  1. AIt is not a neutral atom.
  2. BIts nucleon number is 13.
  3. CIt has 4 valency electrons.
  4. DIt forms ions of a charge of +2.

Question 11

Periodic Table
The element francium, Fr, is in the same group of the Periodic table as potassium. The formula of francium chloride is likely to be
  1. AFr2_2Cl
  2. BFrCl
  3. CFrCl2_2
  4. DFrCl3_3

Question 12

Ionic bonding
The proton number of element X is 19. When X forms an ionic compound, the electronic structure of the ion formed by X is
  1. A2, 8, 8.
  2. B2, 8, 8, 1.
  3. C2, 8, 8, 2.
  4. D2, 8, 8, 3.

Question 13

Chemical equations
Which equation is balanced?
  1. ACO + O2_2 →\rightarrow CO2_2
  2. B2CO + 2O2_2 →\rightarrow 2CO2_2
  3. CCO + O2_2 →\rightarrow 2CO2_2
  4. D2CO + O2_2 →\rightarrow 2CO2_2

Question 14

Organic chemistry

The structural formula of butanedioic acid is shown.

Which statement about butanedioic acid is not true?

  1. AIts molecular formula is C4_4H6_6O4_4.
  2. BIt contains 3 types of elements.
  3. CIts molecular and empirical formulae are the same.
  4. DOne molecule contains 14 atoms.

Question 15

Acids and bases
What is the ionic equation for the reaction between sodium hydroxide and hydrochloric acid?
  1. A2H(aq)+^+_{(aq)} + OH(aq)−^-_{(aq)} →\rightarrow H2_2O(l)_{(l)}
  2. BH(aq)+^+_{(aq)} + OH(aq)−^-_{(aq)} →\rightarrow H2_2O(l)_{(l)}
  3. CNa(aq)+^+_{(aq)} + Cl(aq)−^-_{(aq)} →\rightarrow NaCl2(aq)_{2(aq)}
  4. DH(aq)+^+_{(aq)} + Cl(aq)−^-_{(aq)} →\rightarrow HCl2(aq)_{2(aq)}

Question 16

Stoichiometry

A compound contains 33.3% carbon and 66.7% oxygen.

The empirical formula of the compound is

  1. ACO2_2.
  2. BC2_2O3_3.
  3. CC3_3O2_2.
  4. DCO3_3.

Question 17

Sodium hydrogen carbonate decomposes on heating as shown

2NaHCO3_3 →\rightarrow Na2_2CO3(s)_{3(s)} + H2_2O(l)_{(l)} + CO2(g)_{2(g)}

What is the volume of gas produced at r.t.p, from the decomposition of 4 moles of sodium hydrogen carbonate?

  1. A22.40 dm3^3
  2. B28.00 dm3^3
  3. C44.80 dm3^3
  4. D56.00 dm3^3

Question 18

The mole
What is the number of chlorine molecules in 35.5 g of chlorine gas if the number of molecules in one mole of a gas is xx?
  1. A0.5xx
  2. Bxx
  3. C2xx
  4. D35.5xx

Question 19

Atomic structure
A chloride ion, Cl−^-, has the same number of electrons as
  1. ABr−^-.
  2. BF.
  3. CAr.
  4. DO2−^{2-}.

Question 20

Electrolysis
During electrolysis, cations move towards the
  1. Acathode.
  2. Banode.
  3. Celectrolyte.
  4. Dbattery.

Question 21

An object is electroplated with copper.

Which statement about the process is correct?

  1. AThe concentration of copper ions in the electrolyte increases.
  2. BCopper is used as the cathode.
  3. CCopper ions gain electrons from the object being electroplated.
  4. DOxygen is evolved at the anode.

Question 22

Redox
Which reaction takes place when a photographic film is exposed to light?
  1. A2Ag + Br2_2 →\rightarrow 2AgBr
  2. BAg+^+ + e−^- →\rightarrow Ag
  3. CBr2_2 + 2e−^- →\rightarrow 2Br−^-
  4. DAg+^+ + Br−^- →\rightarrow AgBr

Question 23

Equilibrium
In the equilibrium reaction N2_2 + 3H2_2 ⇌\rightleftharpoons 2NH3_3, which substance(s) will be present in the equilibrium mixture?
  1. ANH3_3 only
  2. BN2_2, H2_2 and NH3_3
  3. CN2_2 and H2_2 only
  4. DH2_2 only

Question 24

Atomic structure
Which row correctly gives the correct number of protons, neutrons and electrons of the ion?
  1. AA
  2. BB
  3. CC
  4. DD

Question 25

Acids and bases
A solution of an alkali in water
  1. Ahas a pH less than 7.
  2. Bturns blue litmus paper red.
  3. Ccontains hydroxide ions.
  4. Dneutralises a salt to produce an acid.

Question 26

Redox
What is the oxidation state of nitrogen in N2_2O3_3?
  1. A+6
  2. B+3
  3. C-3
  4. D-2

Question 27

Metals
Which element is always found in steel?
  1. Acarbon
  2. Bchromium
  3. Cnickel
  4. Dsilicon

Question 28

Metals
Brass is an alloy of
  1. Alead and tin.
  2. Bzinc and copper.
  3. Ciron and carbon.
  4. Diron and aluminium.

Question 29

Extraction of metals
Molten cryolite, Na3_3AlF6_6, is used in the extraction of aluminium because
  1. Ait lowers the melting point of aluminium oxide.
  2. Bit dissolves the aluminium oxide.
  3. Cit increases the melting point of aluminium oxide.
  4. Dit increases the purity of aluminium.

Question 30

Air and the environment
Which one is not an air pollutant?
  1. Anitrogen
  2. Bcarbon monoxide
  3. Cnitrogen oxide
  4. Dvaporised lead compounds

Question 31

Water
Which element is used to purify water for domestic purposes?
  1. Aiodine
  2. Bchlorine
  3. Cfluorine
  4. Dbromine

Question 32

Industrial chemistry
In the manufacture of sulphuric acid by the contact process, the sulphur trioxide is dissolved in
  1. Awater.
  2. Bdilute sulphuric acid.
  3. Cconcentrated sulphuric acid.
  4. Doleum.

Question 33

Industrial chemistry
Which catalyst is used in the manufacture of nitric acid?
  1. Avanadium pentoxide
  2. Bplatinum
  3. Ciron
  4. Dnickel

Question 34

Chemical bonding
What type of a compound is formed when an element P (proton number 12) reacts with an element Q (proton number 17)?
  1. Aa covalent compound of formula PQ
  2. Ba covalent compound of formula PQ2_2
  3. Can ionic compound of formula PQ2_2
  4. Danionic compound of formula P2_2Q

Question 35

Organic chemistry
Which structure has an ester bond?
  1. AA
  2. BB
  3. CC
  4. DD

Question 36

Polyethene and ethane have the same
  1. Aempirical formula.
  2. Brelative molecular mass.
  3. Cmolecular formula.
  4. Dreaction towards aqueous bromine.

Question 37

Organic chemistry

The structure of a compound is shown.

The compound can be classified as an

  1. Aacid and an alkene.
  2. Balcohol and an alkene.
  3. Cacid and an alcohol.
  4. Dester and an alkene.

Question 38

Organic chemistry
Which structure represents a soap molecule resulting from the hydrolysis of fat with aqueous sodium hydroxide?
  1. AA
  2. BB
  3. CC
  4. DD

Question 39

Which one is an advantage of using herbs over conventional medicines?
  1. Aherbs are readily available and cheaper
  2. Bherbs are more effective
  3. Cherbs are not toxic
  4. Dherbs are obtained in a natural form

Question 40

Environmental chemistry
Which method is not recommended for the disposal of non-biodegradable waste?
  1. Areusing
  2. Bbioremediation
  3. Cburning
  4. Dan esterification

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