General Certificate of EducationJune 2003Advanced Level Examination
CHEMISTRY Unit 6a Synoptic Assessment In addition to this paper you will require: Instructions
• Use a black ball-point pen. Do not use pencil. • Fill in the boxes at the top of this page. • Answer all 40 questions. • For each item there are four responses. When you have selected the response which you think is the
best answer to a question, mark this response on your answer sheet.
• Mark all responses as instructed on your answer sheet. If you wish to change your answer to a question,
follow the instructions on your answer sheet.
• Do all rough work in this book, not on your answer sheet. • Make sure that you hand in both your answer sheet and this question paper at the end of this
• The Periodic Table/Data Sheet is provided on pages 3 and 4. Detach this perforated sheet at the start
• Each correct answer will score one mark. No deductions will be made for wrong answers. • This paper carries 10 per cent of the total marks for Advanced Level. • The following data may be required.
Gas constant R = 8.31 J K–1 mol–1
• Do not spend too long on any question. If you have time at the end, go back and answer any question
Copyright 2003 AQA and its licensors. All rights reserved. Ge manium le of the Elements Be yllium
he atomic numbers and approximate relative atomic masses shown in the table are for use in the examination unless stated
otherwise in an individual question. 90 – 103 Table 1 Proton n.m.r chemical shift data Type of proton Table 2 Infra-red absorption data Wavenumber/cm–1 Multiple choice questions
Each of Questions 1 to 20 consists of a question or an incomplete statement followed by four suggested answers or completions. You are to select the most appropriate answer in each case. Questions 1 to 3
The ester methyl ethanoate is hydrolysed as shown in the following equation.
CH3COOCH3(l) + H2O(l) CH3COOH(l) + CH3OH(l) ∆H = +3 kJ mol–1
The equilibrium yield of ethanoic acid could be increased by
adding more water to the reaction mixture.
adding more methanol to the reaction mixture.
A 3 mol sample of methyl ethanoate was mixed with 3 mol of water and left to reach equilibriumat 298 K. The equilibrium yield of ethanoic acid was 2 mol. The value of Kc for this reaction at 298 K is
Which one of the following compounds from the reaction mixture has no hydrogen bondingbetween its molecules when pure?
Turn over ᮣ Questions 4 and 5
Using the information below, answer Questions 4 and 5.
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(g) ∆H = +96 kJ mol–1,
The standard enthalpy of formation of steam is
Ions of the two most common isotopes of the transition metal nickel are shown below.
Which one of the following statements is true?
The electron arrangement of both these Ni
ion will have more protons in its nucleus than the 28 Ni
In the same strength magnetic field, the 28 Ni
ions have the same number of electrons but a different number of
Which one of the following statements about carbon monoxide is not true?
It has a positive enthalpy of combustion.
It is formed during the incomplete combustion of alkanes.
It is oxidised to carbon dioxide when heated strongly with iron(III) oxide.
Compared with an oxygen molecule, it can form a stronger co-ordinate bond with iron(II)in haemoglobin.
Which one of the following is not a redox reaction?
Which one of the following could not act as a ligand?
In which one of the following reactions is H2O2 behaving as a reducing agent?
H2O2 + 2[Co(NH3)6]2+ → 2[Co(NH3)6]3+ + 2OH –
5H2O2 + 2MnO–4 + 6H+ → 2Mn2+ + 8H2O + 5O2
3H2O2 + 2[Cr(OH)6]3– → 2CrO24 + 8H2O + 2OH –
Turn over ᮣ
In which one of the following reactions is there a decrease in entropy?
[Cu(H2O)6]2+(aq) + EDTA4–(aq) → [Cu(EDTA)]2–(aq) + 6H2O(l)
[CoCl4]2–(aq) + 6H2O(l) → [Co(H2O)6]2+(aq) + 4Cl–(aq)
Na2CO3(s) + 2H+(aq) → 2Na+(aq) + CO2(g) + H2O(l)
When aqueous sodium hydroxide was added to an aqueous solution of X, a green precipitate, insoluble in an excess of aqueous sodium hydroxide, was formed. When aqueous barium nitrate was added to a second sample of aqueous X, a white precipitate was obtained. Which one of the following could be X?
In the table below, which one of the following complex ions has a correct shape, co-ordinationnumber and oxidation state?
Co-ordination Oxidation state of central cation
Which one of the following will not reduce an acidified solution of potassium dichromate(VI)?
Butan-1-ol was converted into butyl propanoate by reaction with an excess of propanoic acid. Inthe reaction, 6.0 g of the alcohol gave 7.4 g of the ester. The percentage yield of ester was
Questions 16 to 20
Questions 16 to 20 are about the reaction between propanone and an excess of ethane-1,2-diol, the equation for which is given below.
In a typical procedure, a mixture of 1.00 g of propanone, 5.00 g of ethane-1,2-diol and 0.100 g ofbenzenesulphonic acid, C6H5SO3H, is heated under reflux in an inert solvent. Benzenesulphonic acid isa strong acid.
The products would not have an absorption in the infra-red at
If 0.100 g of the strong monoprotic acid, benzenesulphonic acid, was dissolved in 100 cm3 of water,the pH of the solution would be
Turn over ᮣ
If 1.00 g of propanone was vapourised at 100 °C and 100 kPa pressure, the volume in m3 of gasformed would be
When the concentration of benzenesulphonic acid is doubled, the rate of the reaction doubles. Itcan be deduced that
the reaction is first order overall.
the reaction is third order overall.
units for the rate constant, k, are mol–2 dm6 s–1.
Which one of the following statements is not true?
Ethane-1,2-diol and water can form hydrogen bonds.
Ethane-1,2-diol is soluble in water.
Propane has a higher boiling point than ethane-1,2-diol. Y and water are polar molecules. Multiple completion questions For each of Questions 21 to 40, one or more of the options given may be correct. Select your answer by means of the following code.
if (1), (2) and (3) only are correct. Questions 21 and 22
The following information concerns the gas-phase formation of nitrogen monoxide.
A series of experiments was carried out in a reaction vessel at constant temperature. When the initial pressure of both gases was increased by a factor of 2, the initial rate of reactionincreased by a factor of 8. When the initial pressure of N2 was doubled while that of O2 remained constant, the initial rate ofreaction increased by a factor of 2.
Which of the following statements is/are true?
The reaction is first order with respect to nitrogen.
The yield increases if the pressure is increased.
The rate increases if the pressure is increased.
The equilibrium constant decreases if the temperature is increased.
Which of the following statements is/are true?
The equilibrium constant has the units mol–1 dm3.
Increasing the pressure of both gases by a factor of 3 increases the rate by a factor of 27.
The equilibrium constant increases if the pressure is decreased.
The rate constant has the units mol–2 dm6 s–1. Turn over ᮣ
The standard electrode potential of calcium is more negative than that of magnesium. Which of the following statements is/are true?
Calcium is a stronger reducing agent than magnesium.
Electrons flow from calcium to magnesium.
Magnesium is more readily oxidised than calcium.
Which of the following do/does not involve a redox reaction?
[V(H2O)4Cl2]+ + 2H2O → [V(H2O)6]3+ + 2Cl–
Use the information to deduce the true statement(s) below. Half-equation E /V
VO2(aq) + 2H+(aq) + e– → VO2+(aq) + H2O(l)
VO2+(aq) + 2H+(aq) + e– → V3+(aq) + H2O(l)
there are four different oxidation states of vanadium shown in the table above.
Zn2+(aq) ions will oxidise V2+(aq) ions to V3+(aq) ions.
an excess of zinc is capable of reducing VO2(aq) to V2+(aq) in acidic conditions.
Fe3+(aq) is capable of oxidising V2+(aq) to VO2(aq) in acidic conditions.
Boron trifluoride can form a co-ordinate bond with
Turn over ᮣ Questions 27 and 28
Enthalpy changes which represent enthalpies of formation, enthalpies of bond dissociation orenthalpies of hydration include
∆H1, ∆H5 and ∆H10
∆H4, ∆H6, ∆H7 and ∆H9
∆H4, ∆H5, ∆H7 and ∆H8
∆H1, ∆H4, ∆H5 and ∆H8
In the calculation of the lattice enthalpy of NaCl using the Born–Haber cycle, the following areamong the enthalpy values that are used.
∆H2, ∆H3, ∆H4 and ∆H10
∆H1, ∆H2, ∆H3 and ∆H4
∆H1, ∆H2, ∆H3 and ∆H7
∆H1, ∆H3, ∆H4 and ∆H6
The indicated element increases its oxidation state from left to right in the series
Which of the following is/are correct statements?
The reaction between iodide ions and concentrated sulphuric acid can result in theoxidation state of sulphur being decreased from +6 to –2.
The magnitude of the lattice enthalpy of three Group I halides decreases in the orderNaF > NaCl > KCl.
Solid PCl5 contains a tetrahedral ion and an octahedral ion.
The strength of the metallic bonding in a Group in the Periodic Table increases as the sizeof the atoms increases. TURN OVER FOR THE NEXT QUESTION Turn over ᮣ Questions 31 and 32
Consider the following elements, all in the same row of the Periodic Table.
Use your knowledge of Period 3 and transition metals to answer the questions.
Which of the following has/have only two unpaired electrons in an uncombined atom?
Which of the following has/have a maximum oxidation state of +4?
True statements about 1,2-diaminoethane, H2NCH2CH2NH2, include
it reacts with aqueous chromium(III) chloride to produce the complex ion
it reacts with dilute hydrochloric acid to form the salt [H3NCH2CH2NH3]2+(Cl–)2
it reacts with ethanoyl chloride to form CH3CONHCH2CH2NHCOCH3
it reacts with benzene-1,4-dicarboxylic acid to form an addition polymer.
it can undergo Friedel–Crafts reactions.
it can undergo condensation polymerisation.
it is soluble in dilute hydrochloric acid. Turn over ᮣ Questions 35 and 36
Questions 35 and 36 refer to the following reaction sequence.
Types of reaction involved in the above sequence include
Types of mechanism involved in the above sequence include
Four pairs of reagents are listed below. Which of the statements about the spectra of the organicproducts of these reactions is/are correct?
Reagents Statement about the spectrum of the organic product
The proton n.m.r. spectrum consists of twosinglets only
The proton n.m.r. spectrum contains a doubletat δ 2.5 ppm
The i.r. spectrum contains an absorptionat 3340 cm–1
Correct statements about nitriles include
they are formed by reaction of a haloalkane with KCN.
they react with hydrogen in the presence of a nickel catalyst to form primary amines.
they react with aqueous sulphuric acid to form carboxylic acids.
they react with an excess of ammonia to form quaternary ammonium salts.
Correct statements about CH3CH2CH=CHCOOH include
it can be formed by oxidation of pent-3-en-1-ol. Turn over ᮣ
The compound LiCH3 is a useful reagent in organic chemistry. It can be considered to act as a
Predict which of the following organic compounds would be attacked by a CH3 ion. END OF QUESTIONS
CAPÍTULO II – Dos princípios e finalidades fundamentais.3 CAPÍTULO III – Do patrimônio e das finanças.5 TÍTULO III – DA ORGANIZAÇÃO GERAL .6 CAPÍTULO II – Do conselho de representantes de turma .7 Seção I – Disposições gerais.8 Seção II – Das atribuições especificas .9 CAPÍTULO I – DA COMISSÃO ELEITORAL .10 TÍTULO V – DAS DISPOSIÇOES ESTATUTÁRIAS .12
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