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Thursday 19 January 2012 ­ Afternoon
AS GCE CHEMISTRY A
F322 Chains, Energy and Resources
* F 3 1 4 4 4 0 1 1 2 *




Candidates answer on the Question Paper.

OCR supplied materials: Duration: 1 hour 45 minutes
· Data Sheet for Chemistry A (inserted)

Other materials…

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Answer all the questions.

1 Crude oil is a source of many hydrocarbons.

The skeletal formulae of some of these hydrocarbons are shown below.




A B C




D E F




G H I

(a) Explain why compound A is both saturated and a hydrocarbon.

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(d) The petroleum industry processes straight chain alkanes into cyclic hydrocarbons such as A,
B and E.

(i) Explain why the petroleum industry processes straight chain alkanes into cyclic
hydrocarbons.

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...................................................................................................................................... [1]

(ii) Hydrocarbon C can be processed into the cyclic hydrocarbon B.

Construct an equation for this…

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(h) A hydrocarbon molecule, C16H34, is cracked to form an octane molecule and two molecules
of but-2-ene.

Construct the equation for this reaction.

.............................................................................................................................................. [1]

(i) Compound I is 3-methylheptane. It does not contain a functional group.




I

(i) What is meant by the term functional group?

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2 Ethanoic acid, CH3COOH, is used to make esters.

Some information about two of the processes used to make ethanoic acid is given below.

Process 1

This is a one-step process that involves the reaction of methanol with carbon monoxide.

CH3OH + CO CH3COOH

The conditions used are 180…

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(b) The other products formed in Process 2 are carboxylic acids, aldehydes and ketones.

A research chemist investigates some of these other products of Process 2.

(i) The research chemist isolates product, J.

The infrared spectrum of J is shown below.

100




transmittance
(%)

50




0
4000 3000 2000…

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(ii) The chemist isolates another product, the carboxylic acid, K.

K has the molecular formula C4H8O2.

Suggest a possible structure and name for K.

structure




name ............................................................................................................................ [2]

(c) Ethanoic acid is used in the manufacture of the ester, propyl ethanoate.

Describe how ethanoic acid is converted into propyl…

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3 Enthalpy changes can be determined directly or indirectly.

(a) A student investigates the reaction between magnesium and dilute hydrochloric acid.

Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g)

The student determines the enthalpy change for this reaction.

In her experiment, she reacts 0.486 g of magnesium with 50.0 cm3 of…

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(b) The student wants to determine the enthalpy change of formation of calcium carbonate,
CaCO3(s).

Ca(s) + C(s) + 1½O2(g) CaCO3(s)

(i) What is meant by the term standard enthalpy change of formation?
You should state the standard conditions in your answer.

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(ii) Using…

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4 Hydrogen and chlorine are reacted together to form hydrogen chloride.

H2(g) + Cl2(g) 2HCl(g) H = ­184 kJ mol­1

(a) Calculate the bond enthalpy for the H­Cl bond using the information in the table below.

bond enthalpy
bond
/ kJ mol­1
H­H +436

Cl­Cl +243




bond enthalpy =…

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