OCR GCE AS Level Chemistry A Paper 1 June 2019 question paper H032/01

1h 30m 70 marks

25 questions

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Which statement about the periodic table is not correct?

A The elements are arranged in groups with similar chemical properties.

B The elements are arranged in periods with repeating trends in properties.

C The elements are arranged in order of increasing atomic number.

D The elements in the halogen group increase in reactivity down the group.

$Question 1, shown as an image$

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Which molecule contains the largest bond angle?

A C₂H₄

B H₂O

C NH₃

D CH₄

$Question 2, shown as an image$

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What is the percentage composition by mass of nitrogen in (NH₄)₂CO₃?

A 14.58%

B 17.95%

C 29.17%

D 37.50%

$Question 3, shown as an image$

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Which chemical process is the most sustainable in terms of the atom economy of the organic product?

A CO₂ + 3H₂ → CH₃OH + H₂O

B CH₃CH₂OH + NaCl + H₂SO₄ → CH₃CH₂Cl + NaHSO₄ + H₂O

C CH₃CH₂Br + NaOH → CH₃CH₂OH + NaBr

D CH₃CH₂CH₂CH₂OH → CH₃CH₂CH=CH₂ + H₂O

$Question 4, shown as an image$

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What is the volume of 0.0100 mol of N₂ at 350 °C and 200 kPa?

145 cm³ A

259 cm³ B

145 dm³ C

259 dm³ D

$Question 6, shown as an image$

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Which reaction shows chlorine only being oxidised?

A Cl₂ + H₂O → HCl + HCl O

B 2Cl O₂ + 2NaOH → NaCl O₂ + NaCl O₃ + H₂O

C 4KCl O₃ → 3KCl O₄ + KCl

D MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O

$Question 9, shown as an image$

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A reversible reaction has the enthalpy profile diagram shown below.

$Question 10, shown as an image$

Which statement about this reaction is correct?

The activation energy of the forward reaction is 120 kJ mol⁻¹. A

The activation energy of the reverse reaction is 270 kJ mol⁻¹. B

The enthalpy change of the forward reaction is −30 kJ mol⁻¹. C

D The reverse reaction is exothermic.

$Question 10, shown as an image$

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Hydrogen and chlorine react as shown below.

$Question 11, shown as an image$

Which statement about this reaction is correct?

A Less energy is released on bond making than is taken in during bond breaking.

B The enthalpy change for the reverse equation is +184.6 kJ mol⁻¹.

C The enthalpy change of formation of HCl (g) is –184.6 kJ mol⁻¹.

D The temperature decreases during the reaction.

$Question 11, shown as an image$

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What is the main reason for the increase in reaction rate with increasing temperature?

A The activation energy decreases.

B The activation energy increases.

C More molecules have an energy greater than the activation energy.

D The molecules collide more frequently.

$Question 12, shown as an image$

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A catalyst is added to a system in equilibrium.

What is the effect on the rates of the forward and reverse reactions?

A There is no effect on the rate in either direction.

B Both rates increase by the same factor.

C The rate in the forward direction increases by a greater factor than the reverse direction.

D The rate in the reverse direction increases by a greater factor than the forward direction.

$Question 13, shown as an image$

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What is the best description for the bonding between the carbon atoms in an ethene molecule?

A One maths symbol -bond and one -bond

B One maths symbol -bond

C Two maths symbol -bonds

D Two maths symbol -bonds

$Question 14, shown as an image$

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Which compound is unsaturated, alicyclic and contains an alkyl group?

$Question 15, shown as an image$

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Which statement about an electrophile is correct?

A It is an electron pair acceptor.

B It is a proton donor.

C It is a negative ion.

D It is a species with an unpaired electron.

$Question 16, shown as an image$

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Answer

A section of a polymer is shown below.

Which monomer could form this polymer?

A CH₃CH(OH)CN

B HOCH₂CH₂CN

C H₂C=CHCN

D NCCH=CHCN

$Question 17, shown as an image$

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Which statement about infrared radiation is not correct?

A The energy from IR radiation causes some covalent bonds to vibrate more.

B Absorption of IR radiation by some atmospheric gases is linked by some scientists to global warming.

C IR radiation is used to monitor gases causing air pollution.

D The action of IR radiation on CFCs in the upper atmosphere leads to the formation of chlorine radicals.

$Question 19, shown as an image$

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This question is about atomic structure and the compounds of calcium, nitrogen and oxygen.

(a)

Most elements contain different isotopes.

State two differences between isotopes of the same element.

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(b)

Complete the table for an atom and an ion of two different elements.

Element	Mass number	Protons	Neutrons	Electrons	Charge
..................	..................	26	28	..................	0
..................	80	..................	..................	36	2−

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(c)

Electrons occupy orbitals which are arranged in energy levels.

In the diagram below, each box represents an orbital and each electron is shown as an arrow.

Label the sub-shells and add arrows to show how electrons occupy orbitals in an atom of

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(d)

Calcium reacts with nitrogen to form calcium nitride, Ca₃N₂, which is an ionic compound.

(d)(i)

Construct a ‘dot-and-cross’ diagram for Ca₃N₂.

Show outer electrons only and the charges on each ion.

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(d)(ii)

Calcium nitride reacts with water to form a solution containing two alkaline compounds.

Write an equation for this reaction.

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(d)(iii)

Calcium reacts with oxygen to form a compound which has a giant ionic lattice structure. The diagram shows ions as circles in part of the lattice.

Complete the diagram by showing the symbols of the ions, including charges.

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(d)(iv)

Nitrogen forms an oxide with the formula N₂O. A molecule of N₂O is linear and has a nitrogen atom in the centre.

Draw a ‘dot-and-cross’ diagram for an N₂O molecule.

Show outer electrons only.

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(a)

The student’s burette readings are shown in the table. The rough titre has been omitted.

(a)(i)

Complete the table by adding the titres to the table.

Final reading / cm³	24.60	48.45	34.30
Initial reading / cm³	0.40	24.60	10.00
Titre / cm³	...................	...................	...................

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(a)(ii)

Calculate the mean titre of HCl, to the nearest 0.05 cm³, that the student should use for (ii) analysing the results.

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(b)

Calculate the concentration, in mol dm⁻³, of the hydrochloric acid. (b)

Give your answer to 3 significant figures.

concentration of HCl =........ mol dm⁻³

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(c)

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This question is about halogens and halides.

(a)

The boiling points of the halogens are shown in the table.

Halogen	Boiling point / K
fluorine	85
chlorine	239
bromine	332
iodine	457
astatine	503

Explain the trend in boiling points of the halogens.

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(b)

You are supplied with a sample of ammonium bromide.

Describe simple tests that would identify the cation and anion present in ammonium bromide.

Include reagents, expected observations and relevant equations.

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This question is about ammonia, NH₃.

(a)

In industry, ammonia is made from nitrogen and hydrogen. This is a reversible reaction, as shown in equilibrium 24.1 below.

$Question 24, shown as an image$

(a)(i)

Explain how le Chatelier’s principle can be used to predict the conditions of temperature and pressure for a maximum equilibrium yield of ammonia.

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Answer

(a)(ii)

Using certain conditions, equilibrium 24.1 has the equilibrium concentrations in the

Calculate the numerical value for K_c for equilibrium 24.1 under these conditions.

Give your answer to an appropriate number of significant figures and in standard form

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(b)

(b)(i)

State the conditions of temperature and pressure used for standard enthalpy measurements.

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(b)(ii)

Calculate the standard enthalpy change of formation for NO(g).

Give your answer to a whole number.

$Question 24, shown as an image$

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This question is about alcohols and alkanes.

(a)

Three alcohols A, B and C are structural isomers of C₄H₁₀O.

Each alcohol is refluxed with acidified dichromate(VI), H⁺/Cr₂O₇²⁻.

(a)(i)

Draw the structures for the organic products. If there is no reaction, write ‘ NONE ’.

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(a)(ii)

Write the systematic name for alcohol C.

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(a)(iii)

Complete the equation below for the complete combustion of alcohol A.

C₄H₁₀O........ →........

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(b)

Under suitable conditions, butane, C₄H₁₀, reacts with chlorine by radical substitution. A mixture of organic compounds is formed, including C₄H₉Cl, and compounds D and E.

(b)(i)

Complete the table below to show the mechanism for the initiation and propagation stages of the reaction of C₄H₁₀ with chlorine to form C₄H₉Cl.

In your equations, use molecular formulae and ‘dots’ (•) with any radicals.

Initiation	Equation .................................................................................................... Conditions ..................................................................................................
Propagation	..................................................... → ..................................................... ..................................................... → .....................................................

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(b)(ii)

Organic compound D is formed by substitution of all the H atoms in butane by C l atoms.

Write the equation for the formation of compound D from butane.

Use molecular formulae.

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(b)(iii)

Organic compound E is formed by the substitution of some of the H atoms in butane by C l atoms.

A chemist found that 0.636 g of compound E has a volume of 78.0 cm³. Under the conditions used, the molar gas volume is 32.5 dm³ mol⁻¹.

Determine the molecular formula of compound E.

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OCR H032 · Paper 1

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