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Fuels & Alkanes Question Paper 1 Level IGCSE ExamBoard CIE Topic Organic Chemistry Sub-Topic Fuels & Alkanes Paper (Extended) Theory Booklet Question Paper 1 90 minutes /75 TimeAllowed : Score: Percentage: /100 Subject Chemistry Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/

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Level IGCSE
ExamBoard CIE Topic Organic Chemistry Sub-Topic Fuels & Alkanes Paper (Extended) Theory Booklet Question Paper 1
90 minutes
Percentage: /100
Subject Chemistry
Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
1 (a) Hydrocarbons are compounds which contain hydrogen and carbon only.
• 10 cm3 of a gaseous hydrocarbon, CxHy, are burned in 100 cm3 of oxygen, which is an excess of oxygen.
• After cooling to room temperature and pressure, there is 25 cm3 of unreacted oxygen, 50 cm3 of carbon dioxide and some liquid water.
All volumes are measured under the same conditions of temperature and pressure.
(i) What is meant by an excess of oxygen?
....................................................................................................................................... [1]
(ii) What was the volume of oxygen that reacted with the hydrocarbon?
....................................................................................................................................... [1]
(iii) Complete the table below to express the smallest whole number ratio of
volume of hydrocarbon reacted : volume of
oxygen reacted : volume of
[1]
(iv) Use your answer to (a)(iii) to find the mole ratio in the equation below. Complete the equation and deduce the formula of the hydrocarbon.
.........CxHy(g) + .........O2(g) → .........CO2(g) + .........H2O(l)
formula of hydrocarbon = ........................................... [2]
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(b) Cracking is used to convert long chain alkanes into shorter chain alkanes and alkenes. Alkenes are unsaturated compounds.
Decane, C10H22, can be cracked to give propene and one other product.
(i) Complete the chemical equation.
C10H22 → C3H6 + ............... [1]
....................................................................................................................................... [1]
(iii) Describe a test to show that propene is an unsaturated compound.
test ......................................................................................................................................
result ................................................................................................................................... [2]
(c) Propene can be polymerised. The only product is polypropene. The equation for the polymerisation is:
n
C
H
CH3
C
H
H
nC3H6
....................................................................................................................................... [1]
(ii) Deduce the maximum mass of polypropene that could be produced from 1 kg of propene.
............... kg [1]
propene, .............................................................................................................................
polypropene. ....................................................................................................................... [2]
[Total: 13]
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2 Two homologous series of hydrocarbons are the alkanes and the alkenes.
(a)a) One general characteristic of a homologous series is that the physical properties vary in a
predictable way.
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [3]
.............................................................................................................................................
....................................................................................................................................... [2]
.............................................................................................................................................
....................................................................................................................................... [2]
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(b) Cracking is the thermal decomposition of alkanes into smaller hydrocarbons and possibly hydrogen.
(i) State two conditions required for the cracking of an alkane.
....................................................................................................................................... [2]
(ii) One type of cracking produces an alkane and an alkene.
Complete an equation for the cracking of heptane into an alkane and an alkene.
7H16 C ................ + ................ [1]
(iii) Complete an equation for the cracking of heptane into hydrogen and two other products.
7H16 C ................ + ................ + H2 [1]
....................................................................................................................................... [1]
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(c) Hydrocarbons burn in excess oxygen to form carbon dioxide and water. 20 cm3 of a gaseous hydrocarbon burned in an excess of oxygen, 200 cm3. After cooling, the volume of the residual
gas at r.t.p. was 150 cm3, 50 cm3 of which was oxygen.
(i) Determine the volume of the oxygen used.
....................................................................................................................................... [1]
....................................................................................................................................... [1]
[1]
[Total: 15]
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3 (a) Coal is a solid fossil fuel.
Name two other fossil fuels.
.............................................................................................................................................. [2]
(b) T wo of the elements present in a sample of coal are carbon and sulfur.
A sample of coal was heated in the absence of air and the products included water, ammonia and hydrocarbons.
Name three other elements present in this sample of coal.
.............................................................................................................................................. [2]
(c) Sulfur, present in coal, is one major cause of acid rain. Sulfur burns to form sulfur dioxide which reacts with rain water to form sulfuric acid.
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [2]
(d) In 2010, a large coal-burning power station in the UK was converted to burn both coal and wood.
....................................................................................................................................................
....................................................................................................................................................
....................................................................................................................................................
[Total: 12]
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4 (a) (i) Coal is a solid fossil fuel. Name another fossil fuel.
....................................................................................................................................... [1]
.............................................................................................................................................
....................................................................................................................................... [2]
(b) The burning of fossil fuels is largely responsible for the formation of acid rain. Two of the acids in acid rain are sulfuric acid and nitric acid.
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [3]
Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
.............................................................................................................................................
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [2]
.............................................................................................................................................
[Total: 13]
Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/
5 Butane is oxidised to a mixture of carboxylic acids by oxygen in the presence of a catalyst. The acids formed are methanoic acid, ethanoic acid and propanoic acid – the fi rst three members
of the carboxylic acid homologous series.
(a)a) Give the name and structural formula of the fourth member of this series.
name ...................................................................................................................................
[3]
.............................................................................................................................................
.............................................................................................................................................
What is meant by the term weak acid ?
.............................................................................................................................................
.............................................................................................................................................
....................................................................................................................................... [3]
(b) Carboxylic acids react with alcohols to form esters. Ethanol reacts with ethanoic acid to form the ester ethyl ethanoate, CH3COOCH2CH3.
(i) Give the name and formula of the ester which is formed from methanol and propanoic acid.
name ...................................................................................................................................
formula ................................................................................................................................ [2]
(ii) What is the name of the ester which has the formula CH3COOCH3?
....................................................................................................................................... [1]
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(c)c) Complete the equation for the oxidation of butane to propanoic acid.
3C4H10 + .........O2 → 4C2H5COOH + .......H2O [1]
(ii) Name another compound which can be oxidised to propanoic acid.
....................................................................................................................................... [1]
[Total: 14]
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6 (a) Natural gas, which is mainly methane, is a fossil fuel.
(i) What is meant by the term fuel ?
.............................................................................................................................................
....................................................................................................................................... [2]
(iii) Name a solid fuel which is not a fossil fuel.
....................................................................................................................................... [1]
(b) Fossil fuels are formed by the anaerobic decomposition of organic matter. Anaerobic means in the absence of oxygen.
(i) The organic matter contains hydrogen and carbon. Suggest the products that would be formed if the decomposition occurred in the presence of oxygen.
....................................................................................................................................... [2]
.............................................................................................................................................
.............................................................................................................................................
[Total: 8]
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14.2 Fuels _ Alkanes - QP - IGCSE CIE Biology - extended theory paper.pdf
Fuels & Alkanes

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