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ZIMSEC O Level · 5071/1 · N2017

Chemistry Paper 1 November 2017

Questions
40
Time allowed
60 min
Syllabus code
5071/1

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Questions
40
Pass mark
24
Sit this paper

Answer every question in the printed order, get marked at the end, then see the answers.

The questions

Question 1

Separation techniques
Which method is not suitable for separating a mixture of sand and water?
  1. Adecanting
  2. Bfiltration
  3. Csieving
  4. Dwinnowing

Question 2

Structure and bonding
An example of a solid with a giant molecular structure is
  1. Aiodine.
  2. Bice.
  3. Csilicon (IV) oxide.
  4. Dmagnesium oxide.

Question 3

Metallic bonding
Which statement explains why copper wire conducts electricity?
  1. ACopper atoms gain electrons.
  2. BCopper atoms lose electrons.
  3. CThe "sea of electrons" can move.
  4. DThe "sea of electrons" do not move.

Question 4

Ionic bonding

Magnesium reacts with oxygen to give magnesium oxide.

Which dot-and-cross diagram correctly represents the structure of magnesium oxide?

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

Question 5

Structure and bonding
Silicon (IV) oxide is used in making ceramics because it has
  1. Aan ionic lattice structure.
  2. Ba giant molecular structure.
  3. Ca metallic structure.
  4. Da simple molecular structure.

Question 6

Covalent bonding
Which one is a property of the product formed between hydrogen and carbon?
  1. AHas a high boiling point.
  2. BDoes not conduct electricity.
  3. CThere are electrostatic forces between the molecules.
  4. DDoes not involve sharing of electrons.

Question 7

Atomic structure
Which statement is true about isotopes of boron, 510^{10}_{5}B and 54^{4}_{5}B?
  1. AThey have the same proton number but different mass number.
  2. BThey have the same number of electrons but different proton number.
  3. CThey have the same number of protons and neutrons.
  4. DThey have the same number of electrons and neutrons.

Question 8

Ions
The charge on the hydroxide ion is
  1. A+2.
  2. B-2.
  3. C+1.
  4. D-1.

Question 9

Stoichiometry

A mass of 3.9 g of an element, Z, reacted with oxygen to form 4.7 g of the oxide, Z2_2O.

What could be element Z?

  1. Asodium
  2. Bpotassium
  3. Clithium
  4. Dhydrogen

Question 10

The equation shows a reaction that occurred when 100 cm3^3 of air were passed over heated excess copper in a closed container.

2Cu(s)_{(s)} + O2(g)_{2(g)} →\rightarrow 2CuO(s)_{(s)}

What was the new volume of air after cooling?

  1. A20 cm3^3
  2. B50 cm3^3
  3. C80 cm3^3
  4. D100 cm3^3

Question 11

Stoichiometry

Hydrogen peroxide, H2_2O2_2, decomposes to form water and oxygen according to the equation.

2H2_2O2(aq)_{2(aq)} →catalyst\xrightarrow{\text{catalyst}} 2H2_2O(l)_{(l)} + O2(g)_{2(g)}

The volume of oxygen produced at r.t.p was 60 cm3^3.

[1 mole of gas at r.t.p. has a volume of 28 dm3^3]

What volume of hydrogen peroxide was used?

  1. A30 cm3^3
  2. B60 cm3^3
  3. C120 cm3^3
  4. D1 200 cm3^3

Question 12

A volume of 20 cm3^3 of 0.25 mol/dm3^3 sodium hydroxide reacted completely with 25 cm3^3 of nitric acid. The chemical equation for the reaction is

NaOH(aq)_{(aq)} + HNO3(aq)_{3(aq)} →\rightarrow NaNO3(aq)_{3(aq)} + H2_2O(l)_{(l)}

What was the concentration of the acid?

  1. A0.2 mol/dm3^3
  2. B0.25 mol/dm3^3
  3. C12.6 mol/dm3^3
  4. D0.315 mol/dm3^3

Question 13

NaOH(aq)_{(aq)} reacts with N2_2O4(g)_{4(g)} according to the equation:

N2_2O4(g)_{4(g)} + 2NaOH(aq)_{(aq)} →\rightarrow NaNO3(aq)_{3(aq)} + H2_2O(l)_{(l)} + NO2(g)_{2(g)}

What volume of 1.0 mol/dm3^3 NaOH(aq)_{(aq)} is required to absorb 0.04 mol of N2_2O4_4?

  1. A80 cm3^3
  2. B40 cm3^3
  3. C20 cm3^3
  4. D0.08 cm3^3

Question 14

Electrolysis

The diagram shows the electrolysis of copper (II) sulphate solution using copper electrodes.

Which graph correctly shows the change in mass of the anode with time?

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

Question 15

Organic waste decomposes in water to form an acidic solution.

Which compound can be used to neutralise the acidic solution?

  1. Acalcium hydroxide
  2. Bcalcium chloride
  3. Cpotassium nitrate
  4. Dpotassium sulphate

Question 16

Electrolysis
Which one is not a product of the electrolysis of brine?
  1. Achlorine
  2. Bhydrogen
  3. Coxygen
  4. Dsodium hydroxide

Question 17

Rates of reaction

Powdered calcium reacts with sulphuric acid as shown by the equation.

Ca(s)_{(s)} + H2_2SO4(aq)_{4(aq)} →\rightarrow CaSO4(aq)_{4(aq)} + H2(g)_{2(g)}

The speed of the reaction can be increased by

  1. Ausing granules of calcium.
  2. Badding dilute sulphuric acid.
  3. Cwarming the mixture.
  4. Dadding less powdered calcium.

Question 18

Vanadium (V) oxide is used in the Contact Process for the formation of sulphur trioxide.

What is the effect of the vanadium (V) oxide on the reaction?

  1. Aincreases the yield of sulphur trioxide
  2. Bincreases the kinetic energy of the reactants
  3. Cspeed up the rate of the forward reaction
  4. Dlowers the speed of the reverse reaction

Question 19

Redox
Which one is a redox reaction?
  1. AZn(s)_{(s)} + 2HCl(aq)_{(aq)} →\rightarrow ZnCl2(aq)_{2(aq)} + H2(g)_{2(g)}
  2. BH(aq)+^+_{(aq)} + OH(aq)−^-_{(aq)} →\rightarrow H2_2O(l)_{(l)}
  3. CAl(aq)3+^{3+}_{(aq)} + 3OH(aq)−^-_{(aq)} →\rightarrow Al(OH)3(s)_{3(s)}
  4. DAl2_2Cl6(g)_{6(g)} →\rightarrow 2AlCl3(g)_{3(g)}

Question 20

Which statement is correct about all acids?
  1. AThey contain hydrogen and oxygen only.
  2. BThey react with oxides to form a salt and hydrogen.
  3. CThey react with some metals to produce hydrogen.
  4. DThey can be electrolysed to produce hydrogen.

Question 21

Oxides
Which pair consists of amphoteric oxides only?
  1. ASO3_3 and CO2_2
  2. BZnO and MgO
  3. CAl2_2O3_3 and MgO
  4. DZnO and Al2_2O3_3

Question 22

Qualitative analysis

A white precipitate was obtained when acidified barium nitrate was added to a solution.

The ion present in the solution could be

  1. AAl3+^{3+}
  2. BCl−^-
  3. CZn2+^{2+}
  4. DSO42−_4^{2-}

Question 23

What can be deduced from the symbol 714^{14}_{7}Z?
  1. AThe element is in Group (VII).
  2. BThe element forms an ion of charge -1.
  3. CThe element has an ion of charge -3.
  4. DThe element has an ion of charge +3.

Question 24

Periodic Table
Which element is a metal?
  1. Aberylium
  2. Bboron
  3. Cphosphorous
  4. Dsulphur

Question 25

Which element shows the same oxidation number in its compounds?
  1. Achlorine
  2. Bnitrogen
  3. Cmagnesium
  4. Dsulphur

Question 26

An aqueous solution containing potassium bromide produces bromine when treated with substance Z.

What could be substance Z?

  1. Apotassium chloride
  2. Bpotassium iodide
  3. Cchlorine gas
  4. Diodine

Question 27

Energy changes
An example of an endothermic reaction is when
  1. Asulphuric acid reacts with sodium hydroxide.
  2. Bmagnesium displaces copper (II) ions in aqueous solution.
  3. Cammonium nitrate dissolves in water.
  4. Dsodium hydroxide dissolves in water.

Question 28

Carbonates
The products of decomposition of magnesium carbonate by heating are
  1. Amagnesium and carbon.
  2. Bmagnesium oxide and carbon dioxide.
  3. Cmagnesium oxide and carbon monoxide.
  4. Dmagnesium and carbon dioxide.

Question 29

Extraction of metals

The diagram shows the Blast Furnace for the extraction of iron.

What is Y?

  1. Acoke
  2. Bcalcium silicate
  3. Csilica
  4. Dpig iron

Question 30

A gas present in car exhaust fumes in large amounts is
  1. Anitrogen
  2. Bcarbon dioxide
  3. Ccarbon monoxide
  4. Dwater vapour

Question 31

Why is aluminium oxide dissolved in molten cryolite in the extraction of aluminium?
  1. Ato lower the melting point of bauxite
  2. Bto prevent the reaction of electrodes with aluminium
  3. Ccryolite increases electrical conductivity of molten bauxite
  4. Daluminium oxide forms a protective layer and becomes unreactive

Question 32

Which set of conditions would give an increase in the yield of ammonia?
  1. Ahigh temperature, high pressure
  2. Blow temperature, low pressure
  3. Clow temperature, high pressure
  4. Dhigh temperature, low pressure

Question 33

Which is not a use of sulphur dioxide?
  1. Ableaching agent
  2. Bpaper manufacture
  3. Cfood preservation
  4. Dneutralising acids

Question 34

Organic chemistry
Which compound is an alkane?
  1. ACH3_3CO2_2CH3_3
  2. BC2_2H5_5OH
  3. CC8_8H18_{18}
  4. DC6_6H12_{12}

Question 35

Which compound decolourises aqueous bromine?
  1. AA
  2. BB
  3. CC
  4. DD

Question 36

Which compound can be oxidised to produce ethanoic acid?
  1. ACH3_3CH3_3
  2. BCH3_3CH2_2CH3_3
  3. CCH3_3CH2_2OH
  4. DCH3_3CH2_2CH2_2CH2_2OH

Question 37

Isomerism

The structural formula of butanol is shown.

Which substance is an isomer of butanol?

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

Question 38

Organic chemistry
Which substance can be used to distinguish between ethanol, CH3_3CH2_2OH and ethanoic acid, CH3_3CO2_2H?
  1. Aglowing splint
  2. Bbromine water
  3. Csulphuric acid
  4. Dblue litmus paper

Question 39

Organic chemistry

A substance, X, reacts with its own oxidation product to give an ester.

X could be

  1. Abutane.
  2. Bbutene.
  3. Cbutanol.
  4. Dbutanoic acid.

Question 40

Polymers

Part of a polymer is given as:

Which formula shows its correct monomer?

  1. AC2_2H3_3Cl
  2. BC2_2H5_5Cl
  3. CC3_3H5_5Cl
  4. DC3_3H3_3Cl

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