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A Level Chemistry P1 11 June 2015

29b7f287e682a91d10a09816092868f5.pngCambridge International Examinations
Cambridge International Advanced Subsidiary and Advanced Level


Paper 1 Multiple Choice
May/June 2015
1 hour

Additional Materials:

Multiple Choice Answer Sheet
Soft clean eraser
Soft pencil (type B or HB is recommended)
Data Booklet


Write in soft pencil.
Do not use staples, paper clips, glue or correction fluid.
Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless this has been done for you.

There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D.
Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet.

Read the instructions on the Answer Sheet very carefully.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Any rough working should be done in this booklet.
Electronic calculators may be used.

Section A

For each question there are four possible answers, A, B, C, and D. Choose the one you consider to be correct.


The diagram shows a Boltzmann distribution of molecular energies for a gaseous mixture. The distribution has a peak, labelled P on the diagram.


What happens when an effective catalyst is added to the mixture?


Which quantity gives the best indication of the relative strengths of the hydrogen bonds between the molecules in liquid hydrogen halides?


Use of the Data Booklet is relevant to this question.

1.00 g of carbon is combusted in a limited supply of pure oxygen. 0.50 g of the carbon combusts to form CO2 and 0.50 g of the carbon combusts to form CO.

The resultant mixture of CO2 and CO is passed through excess NaOH(aq) and the remaining gas is then dried and collected.

What is the volume of the remaining gas? (All gas volumes are measured at 25 °C and 1 atmosphere pressure.)


In oxygen difluoride, OF2, fluorine has an oxidation number of -1. OF2 will react with sulfur dioxide according to the following equation.

OF2 + SO2 → SO3 + F2

What is oxidised and what is reduced in this reaction?


Use of the Data Booklet is relevant to this question.

The gas laws can be summarised in the ideal gas equation below.

pV = nRT

0.96 g of oxygen gas is contained in a glass vessel of volume 7.0 x 10-3 m3 at a temperature of 30 °C.

Assume the gas behaves as an ideal gas.

What is the pressure in the vessel?


One mole of phosphorus (V) chloride, PCl5, is heated to 600 K in a sealed flask of volume 1 dm3. Equilibrium is established and measurements are taken.


The experiment is repeated with one mole of phosphorus (V) chloride heated to 600 K in a sealed flask of volume 2 dm3.

How will the measurements vary?


The standard enthalpy changes of combustion of glucose and ethanol are given as -2820 and -1368 kJ mol-1 respectively.

Glucose, C6H12O6, can be converted into ethanol.

C6H12O6(s) → 2C2H5OH(l) + 2CO2(g)

What is the standard enthalpy change for this reaction?


In which reaction is the underlined substance acting as a base?


One molecue of haemoglobin, Hb, can bind with four molecules of oxygen according to the following equation.


When the equilibrium concentration of O2 is 7.6 x 10-6 mol dm-3, the equilibrium concentrations of Hb and Hb(O2)4 are equal.

What is the value of Kc for this equilibrium?


The double bond between the two carbon atoms in an ethene molecule consists of one σ bond and one π bond.

Which orbitals overlap to form each of these bonds?


The diagram shows a reaction pathway for an endothermic reaction.

Which arrow represents the activation energy for the forward reaction?



In the industrial electrolysis of brine to manufacture chlorine, the diaphragm used is a porous screen which allows the flow of electrolytes but keeps other chemicals separate.

Which substance needs to be kept separate from the chlorine by the diaphragm?


The three minerals below are obtained from mines around the world. Each one behaves as a mixture of two carbonate compounds. They can be used as fire retardants because they decompose in the heat, producing CO2. This gas smothers the fire.


What is the order of effectiveness as fire retardant, from best to worst?


Which observations are made when a sample of silicon chloride, SiCl4, is added to a beaker of water?


Use of the Data Booklet is relevant to this question.

Which diagram correctly shows the atomic radii of the elements Mg, Al, Si and P plotted against their melting points?


Chlorine is widely used in water treatment plants.

Which reaction takes place when chlorine dissolves in water?


Astatine, At, is below iodine in Group VII of the Periodic Table.

Which statement is mostly likely to be correct?


Mohr's salt is a pale green crystalline solid which is soluble in water. It contains two cations, one of which is Fe2+, and one anion which is SO42-.

The identity of the second cation was determined by heating Mohr's salt with aqueous sodium hydroxide. A colourless gas was evolved which readily dissolved in water giving an alkaline solution.

A green precipitate was also formed.

What are the identities of the gas and the precipitate?


Use of the Data Booklet is relevant to this question.

Which mass of solid residue will be obtained from the thermal decomposition of 4.10 g of anhydrous calcium nitrate?


Which reagent will give a different observation with compounds P and Q?



The cyclic compound M is heated with dilute hydrochloric acid.


What are the products of the reaction?


Cottonseed oil contains large amounts of polyunsaturated carboxylic acids. When this oil is used to make margarine, the C=C double bonds in the unsaturated carboxylic acids are hydrogenated.

What reagents and conditions would be suitable to bring about this hydrogenation reaction?


Which intermediate ion forms in the greatest amount during the addition of HBr to propene?


Coniine is the major constituent of the poison 'oil of hemlock'.


Coniine can be synthesised by reacting ammonia with a dibromo compound, X.


What is the name of compound X?


2-bromopropane reacts with a hot concentrated solution of sodium hydroxide in ethanol.

Which substance is the major product of this reaction?


The presence of a halogen in an organic compound may be detected by warming the organic compound with aqueous silver nitrate.

Which compound would be the quickest to produce a precipitate?


Which reagent will give a different observation with compounds W and X?



In 1869 Ladenburg suggested a structure for benzene, C6H6, in which one hydrogen atom is attached to each carbon atom.


A compound C6H4Cl2 could be formed with the same carbon skeleton as the Ladenburg structure.

How many structural isomers would this compound have?


The citrus flavour of lemons is due to the compound limonene, present in both the peel and the juice.


What is the mole ratio of carbon dioxide to water produced when limonene is completely burnt in oxygen?


What is the organic product when ethanamide, CH3CONH2, is boiled with excess aqueous sodium hydroxide?

Section B

For each of the questions in this section, one or more of the three numbered statements 1 to 3 may be correct.

Decide whether each of the statements is or is not correct (you may find it helpful to put a tick against the statements that you consider to be correct).

The responses A to D should be selected on the basis of

1, 2 and 3 are correct1 and 2 only are correct2 and 3 only are correct1 only is correct

No other combination of statements is used as a correct response.


Use of the Data Booklet is relevant to this question.

The isotope 99Tc is radioactive and has been found in lobsters and seaweed adjacent to nuclear fuel reprocessing plants.

Which statements are correct about an atom of 99Tc?

1    It has 13 more neutrons than protons.
2    It has 43 protons.
3    It has 99 nucleons.


Urea is a product of animal metabolism. It can also be used as a fertiliser.


The diagram shows angle x in this molecule.

Which statements about the structure of urea are correct?

1    Angle x is approximately 120°
2    The molecule has two π bonds.
3    The molecule has only three lone pairs of electrons.


Aluminium is extracted from aluminium oxide by electrolysis.

Which statements are correct?

1    Aluminium oxide has an extremely high melting point.
2    Bauxite is added to the aluminium oxide to lower its melting point.
3    Oxygen produced at the graphite cathode reacts with the graphite to produce CO2.


Why does raising the pressure of a fixed mass of gaseous reactants at a constant temperature cause an increase in the rate of reaction?

1    More collisions occur per second when the pressure is increased.
2    More molecules have energy greater than the activation energy at the higher pressure.
3    Raising the pressure lowers the activation energy.


Which statements about the industrial manufacture of sulfuric acid are correct?

1    Sulfur is burned to form sulfur dioxide.
2    The stage that forms sulfur trioxide involves a V2O5 catalyst.
3    The stage that forms sulfur trioxide is non-reversible.


X is a Group II metal. It forms a sulfate which is more soluble than barium sulfate. It forms a hydroxide which is more soluble than calcium hydroxide.

What could be the identity of X?

1    strontium
2    magnesium
3    beryllium


The diagram shows the structure of an alkene molecule.


Which statements about this molecule are correct?

1    All the carbon atoms are in the same plane.
2    It has geometrical isomers.
3    It is optically active.


An organic compound, X, will react with calcium metal to produce a salt with the empirical formula CaC4H4O4.

What could be the identity of X?

1    ethanoic acid
2    butanedioic acid
3    2-methylpropanedioic acid


Which compounds will react with HBr to give the compound R?




5-hydroxypentanoic acid is readily converted into the cyclic compound L.


Which statements about this reaction are correct?

1    Acidified sodium dichromate(VI) is used as a reagent.
2    A water molecule is produced in the reaction.
3    The reaction is catalysed by concentrated H2SO4.


©UCLES 2015


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