Download AS Paper 2 Practice Paper 19 - A

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AS LEVEL CHEMISTRY
PAPER 2
PRACTICE PAPER 19
(structured questions only)
Answer all questions
Max 80 marks
Name
……………………………………………………………..
Mark
……../80
……....%
Grade ………
Note – this paper only contains structured questions
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1.
(Total 5 marks)
2.
(6)
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(4)
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(5)
(Total 15 marks)
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3.
Compound X is shown below. It is a member of a homologous series of hydrocarbons.
(a)
(i)
Deduce the general formula of the homologous series that contains X.
...............................................................................................................
(1)
(ii)
Name a process used to obtain a sample of X from a mixture containing other
members of the same homologous series.
...............................................................................................................
(1)
(b)
There are several isomers of X.
(i)
Give the IUPAC name of the position isomer of X.
...............................................................................................................
(1)
(ii)
Draw the structure of a functional group isomer of X.
(1)
(c)
At high temperatures, one molecule of C15H32 can be converted into two molecules of X
and one molecule of another compound.
(i)
Write an equation for this reaction.
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(1)
(ii)
State the name of the process used to obtain a high yield of X from C15H32
Give one reason why this process is used in industry.
Name ....................................................................................................
Reason .................................................................................................
...............................................................................................................
(2)
(iii)
State why high temperatures are needed for this process.
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(1)
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(d)
Compound X can be converted into compound Y.
Compound Y is shown below.
(i)
Write an equation to show the reaction of Y in a limited supply of air to produce a
solid and water only.
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(1)
(ii)
When a sample of Y, contaminated with CH3SH, is burned completely in air, a toxic
gas is formed.
Identify this toxic gas and suggest a compound that could be used to remove the
toxic gas from the products of combustion.
Toxic gas ..............................................................................................
Compound used to remove toxic gas ..................................................
...............................................................................................................
(2)
(iii)
Suggest the name of the process that occurs when the toxic gas in part (d)(iv) is
removed.
...............................................................................................................
(1)
(e)
Explain why the boiling points of X and Y are similar.
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(2)
(Total 14 marks)
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4.
(a)
Hexane (C6H14) is a hydrocarbon which is a component of LPG (liquid petroleum gas),
used as a fuel for heating. When burning fuels in boilers it is important to ensure complete
combustion.
(i)
Give two reasons why boilers are designed to ensure complete combustion.
Reason 1 ............................................................................................
.............................................................................................................
Reason 2 ............................................................................................
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(ii)
Write an equation for the incomplete combustion of hexane.
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(iii)
Suggest how an engineer or a chemist could demonstrate that the combustion of
hexane in a faulty boiler was incomplete.
.............................................................................................................
(5)
(b)
Branched chain alkanes are often preferred as fuels. Draw the structure of two branched
chain isomers of hexane and name the first isomer.
Isomer 1
Isomer 2
Name of isomer 1 ........................................................................................
(3)
(c)
Hexane can be cracked in the presence of a catalyst to produce another hydrocarbon, Z,
and methane.
(i)
Draw a possible structure for Z.
(ii)
Give a suitable catalyst for this reaction.
.............................................................................................................
(iii)
Suggest why the product Z has more commercial value than hexane.
.............................................................................................................
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(3)
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(d)
The overall equation for the production of dichloromethane from methane and chlorine is
shown below.
CH4 + 2Cl2 → CH2Cl2 + 2HCl
(i)
Calculate the % atom economy for the formation of CH2Cl2 in this reaction.
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(ii)
Give one reason why this atom economy of less than 100% is an important
consideration for the commercial success of this process and predict how a
chemical company would maximise profits from this process.
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(3)
(Total 14 marks)
5.
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6.
(Total 8 marks)
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7.
A …………………………………………………………………………………………………………………………………………………………………
B …………………………………………………………………………………………………………………………………………………………………
D …………………………………………………………………………………………………………………………………………………………………
(3)
Name of mechanism:………………………………………………………………………………………….
(4)
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Name of mechanism:………………………………………………………………………………………….
(5)
Name of mechanism:………………………………………………………………………………………….
(3)
(Total 15 marks)
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8.
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