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ZIMSEC A Level · J2009

Chemistry Paper 3 June 2009

Questions
40

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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

atomic structure
What is the composition of the free radical of chlorine, 35Cl^{35}Cl?
  1. A17 protons, 18 neutrons, 16 electrons
  2. B17 protons, 18 neutrons, 17 electrons
  3. C18 protons, 17 neutrons, 17 electrons
  4. D18 protons, 17 neutrons, 18 electrons

Question 2

stoichiometry
A mixture of equal volumes of methane and ethane was burned in excess oxygen. After cooling to room temperature, the residual gas absorbed in KOH(aq)KOH_{(aq)} was found to be 30 cm3cm^3. What was the volume of methane at the beginning?
  1. A10 cm3cm^3
  2. B15 cm3cm^3
  3. C20 cm3cm^3
  4. D25 cm3cm^3

Question 3

atomic structure / electron configuration
What is the order of increasing energy of given orbitals in an atom of titanium?
  1. A3s, 3p, 3d, 4s
  2. B3s, 3p, 4s, 3d
  3. C3s, 4s, 3, 3d
  4. D3s, 3d, 3p, 4s

Question 4

atomic structure
Which statement about relative atomic mass is correct?
  1. AIt is a ratio of masses.
  2. BIt is measured in grams.
  3. CIt is related to the number of atoms in a molecule.
  4. DIt is the same as the mass of 1 mol of atoms.

Question 5

atomic structure / electron configuration
Which ion contains an unpaired electron?
  1. ACa2+Ca^{2+}
  2. BCu2+Cu^{2+}
  3. CK+K^+
  4. DTi4+Ti^{4+}

Question 6

inorganic chemistry / combustion
What are the products of complete combustion of silane?
  1. ASi and H2OH_2O
  2. BSiOSiO and H2OH_2O
  3. CSiO2SiO_2 and H2OH_2O
  4. DSiO2SiO_2 and H2H_2

Question 7

redox chemistry
What changes in oxidation numbers take place when copper reacts with concentrated nitric acid to give a blue solution and a brown acidic gas?
  1. ACopper: +1, Nitrogen: +1
  2. BCopper: +2, Nitrogen: +1
  3. CCopper: +2, Nitrogen: +2
  4. DCopper: +1, Nitrogen: +2

Question 8

electrochemistry
A research student performed a constant current electrolysis of silver solution using a carbon electrode as the cathode. The electrolysis was allowed to proceed for 0.25 hours at a limiting current of 1.25 A. What is the mass of silver deposited?
  1. A33.75 g
  2. B1.26 g
  3. C0.63 g
  4. D0.02 g

Question 9

bonding / polarisation
Which ion is least polarising?
  1. AAl3+Al^{3+}
  2. BBa2+Ba^{2+}
  3. CNa+Na^+
  4. DMg2+Mg^{2+}

Question 10

organic chemistry / reaction mechanisms
Which statement always applies to an electrophile?
  1. AAttacks alkenes only.
  2. BPositively charged.
  3. CContains a lone pair of electrons.
  4. DElectron deficient.

Question 11

inorganic chemistry / period 3
Element X forms a chloride which is hydrolysed by water to form an acidic solution. Oxide of X reacts with an acid to form a salt. What is X?
  1. AMagnesium.
  2. BAluminium.
  3. CSilicon.
  4. DPhosphorous.

Question 12

energetics / lattice energy
Which compound has the greatest numerical value of lattice energy?
  1. ALithium iodide.
  2. BLithium fluoride.
  3. CSodium chloride.
  4. DSodium bromide.

Question 13

bonding / intermolecular forces
Which statement explains why the boiling point of methane is greater than that of neon?
  1. AMethane has a greater mass than neon.
  2. BMethane has stronger covalent bonds than neon.
  3. CMethane has stronger van der Waals forces than neon.
  4. DMethane is polar, but neon is not.

Question 14

nitrogen chemistry / agriculture
Soils can retain nitrogen when nitrates from fertilisers are converted into ammonium ions. What conditions in the soil would improve the production and retention of ammonium ions?
  1. AAcidic and oxidising.
  2. BAcidic and reducing.
  3. CAlkaline and oxidising.
  4. DAlkaline and reducing.

Question 15

organic chemistry / aromatic compounds
With which reagent do phenol and phenylamine give similar reactions?
  1. ABr2(aq)Br_{2(aq)}
  2. BHCl(aq)HCl_{(aq)}
  3. CHNO2(aq)HNO_{2(aq)}
  4. DNaOH(aq)NaOH_{(aq)}

Question 16

organic chemistry / functional group tests
Which reagent detects the presence of added alcohol in petrol consisting of a mixture of alkanes and alkenes?
  1. ANa.
  2. BBr2Br_2 (in CCl4CCl_4).
  3. CKMnO4(aq)KMnO_{4(aq)}.
  4. DNaOH(aq)NaOH_{(aq)}

Question 17

organic chemistry / aldehydes
What is the product formed when propanal (CH3CH2CHOCH_3CH_2CHO) is boiled with Fehling's solution?
  1. ACH3CH2CH2OHCH_3CH_2CH_2OH
  2. BCH3−CO−CH3CH_3-CO-CH_3
  3. CCH3CH2COOHCH_3CH_2COOH
  4. DCH3CH2CH2CO2−CH_3CH_2CH_2CO_2^-

Question 18

organic chemistry / aldehydes
Which ion is responsible for the observation made when testing for aldehydes with Tollen's reagent?
  1. ACu2+Cu^{2+}
  2. BAg+Ag^+
  3. CNH4+NH_4^+
  4. DOH−OH^-

Question 19

organic chemistry / nucleophilic addition
What is the product formed when CH3COCH3CH_3COCH_3 reacts with HCN in the presence of traces of KCN(aq)KCN_{(aq)}?
  1. AStructure A (shown in diagram)
  2. BStructure B (shown in diagram)
  3. CStructure C (shown in diagram)
  4. DStructure D (shown in diagram)

Question 20

organic chemistry / esters
Which compound reacts with its oxidation product to give a sweet smelling liquid?
  1. Apropanal.
  2. Bpropanoic acid.
  3. Cpropanone.
  4. Dpropanol.

Question 21

organic chemistry / aromatic substitution
What are the main products formed when iron filings are added to a mixture of methylbenzene and bromine in the dark?
  1. ABenzyl bromide (CH2BrCH_2Br-benzene) and CHBr-benzene
  2. BBenzyl bromide with ring Br and another with two ring Br substituents
  3. C2-bromotoluene and 4-bromotoluene (ring substitution products)
  4. D2-bromotoluene and 4-bromotoluene

Question 22

organic chemistry / nucleophilic substitution
What name is given to the reaction between 2-iodobutane and sodium ethoxide (CH3CH2O−Na+CH_3CH_2O^-Na^+)?
  1. AElectrophilic addition.
  2. BElectrophilic substitution.
  3. CNucleophilic addition.
  4. DNucleophilic substitution.

Question 23

organic chemistry / iodoform test
Which of the following will give a yellow precipitate with iodine in sodium hydroxide?
  1. ACH3CH2CH2OHCH_3CH_2CH_2OH
  2. BCH3CH2CHOCH_3CH_2CHO
  3. CCH3COCH2OHCH_3COCH_2OH
  4. DCH3CH2COOHCH_3CH_2COOH

Question 24

organic chemistry / elimination
Which isomer of C5H11OHC_5H_{11}OH, on dehydration, gives the greatest number of alkenes?
  1. ACH3CH2−CH−CH2OHCH_3CH_2-CH-CH_2OH (with CH3CH_3 branch)
  2. BCH3−CH2−CH2−CH(CH3)−OHCH_3-CH_2-CH_2-CH(CH_3)-OH
  3. CCH3CH2−CH−CH2CH3CH_3CH_2-CH-CH_2CH_3 (with OH)
  4. DCH3−CH−CH2−CH2OHCH_3-CH-CH_2-CH_2OH (with CH3CH_3 branch)

Question 25

bonding / molecular shapes
A molecule X is polar, has a pyramidal shape and reacts with acids to form salts. What is X?
  1. AAlCl3AlCl_3
  2. BNH3NH_3
  3. CBF3BF_3
  4. DSO3SO_3

Question 26

energetics / enthalpy
Which statement is true about the enthalpy change of atomisation?
  1. AIt has a positive value.
  2. BIt has a negative value.
  3. CIt is usually found directly from experiments.
  4. DIt is the same as bond energy.

Question 27

kinetics / rate equations
The rate equation for a certain reaction is rate =k[X]2[Y]3= k[X]^2[Y]^3. What are the units for the rate constant kk?
  1. Amol5 dm−15 s−1mol^5 \ dm^{-15} \ s^{-1}
  2. Bmol−5 dm15 s−1mol^{-5} \ dm^{15} \ s^{-1}
  3. Cmol−4 dm12 s−1mol^{-4} \ dm^{12} \ s^{-1}
  4. Dmol4 dm−12 s−1mol^4 \ dm^{-12} \ s^{-1}

Question 28

organic chemistry / polymers
Which pair of compounds are the monomers of terylene?
  1. AHOOC(CH2)4COOHHOOC(CH_2)_4COOH and HOCH2CH2OHHOCH_2CH_2OH
  2. BHOOC(CH2)6COOHHOOC(CH_2)_6COOH and H2N(CH2)6NH2H_2N(CH_2)_6NH_2
  3. CHOOC−C6H4−COOHHOOC-C_6H_4-COOH and HOCH2CH2OHHOCH_2CH_2OH
  4. DHOOC−C6H4−COOHHOOC-C_6H_4-COOH and H2N(CH2)6NH2H_2N(CH_2)_6NH_2

Question 29

organic chemistry / amino acids
Which structure is the zwitterionic form of serine?
  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Question 30

bonding / molecular shapes / VSEPR
Which molecule has lone pair – lone pair repulsion?
  1. AH2OH_2O
  2. BNH3NH_3
  3. CBF3BF_3
  4. DCO2CO_2

Question 31

inorganic chemistry / Group 2
Which statement(s) about the elements calcium, strontium and barium is/are correct?
1. Their oxides are amphoteric.
2. The aqueous solutions of their hydroxides are alkaline.
3. They react with cold water liberating hydrogen.
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 32

energetics / enthalpy
Which process(es) is/are always endothermic?
1. The hydration of a gaseous cation.
2. The dissociation of a diatomic molecule into atoms.
3. The melting of a solid.
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 33

energetics / solubility / Group 2
Why is magnesium sulphate more soluble than barium sulphate?
1. Barium sulphate has a numerically larger lattice energy than magnesium sulphate.
2. The enthalpy change of hydration of magnesium ions is more exothermic than that of Ba2+Ba^{2+} ions.
3. The charge density of magnesium ions is greater than that of barium ions.
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 34

organic chemistry / polymers
Which of the following are properties of poly(ethane)?
1. It has an empirical formula of CH2CH_2.
2. The C-C-C bond angle is 120°.
3. It decolourises bromine.
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 35

organic chemistry / empirical formulae
Which compound(s) has/have an empirical formula CH2OCH_2O?
1. methanal.
2. ethanoic acid.
3. methyl methanoate.
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 36

inorganic chemistry / thermal decomposition
Which substance(s) change(s) in mass when heated?
1. Magnesium.
2. Magnesium nitrate.
3. Magnesium carbonate.
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 37

redox chemistry / oxidation numbers
In which of the following conversions does the oxidation number of nitrogen change by two?
1. NH2OH⟶NH3NH_2OH \longrightarrow NH_3
2. N2⟶NON_2 \longrightarrow NO
3. NO2⟶HNO3NO_2 \longrightarrow HNO_3
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 38

organic chemistry / isomerism
Which compound(s) show(s) cis-trans isomerism?
1. but-2-ene.
2. but-1-ene.
3. 2-methylpropene.
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 39

organic chemistry / cracking
When octane is subjected to catalytic cracking, which compound(s) can be obtained?
1. CH2=CH2CH_2 = CH_2
2. CH3CH2CH=CH2CH_3CH_2CH = CH_2
3. CH3(CH2)4CH3CH_3(CH_2)_4CH_3
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

Question 40

organic chemistry / free radical substitution
Which compound(s) result(s) from mixing ethane and chlorine in the presence of sunlight?
1. CH3CH2ClCH_3CH_2Cl
2. CH3CH2CH2CH3CH_3CH_2CH_2CH_3
3. CH3CHClCHClCH3CH_3CHClCHClCH_3
  1. A1, 2 and 3 are correct
  2. B1 and 2 only are correct
  3. C2 and 3 only are correct
  4. D1 only is correct

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