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Revision Guide- IAL & GCE Chemistry -UNIT 1 (New Syllabus) £7.68   Add to cart
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  3. PEARSON (PEARSON)
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  5. Chemistry 2015
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  7. Unit 6 - Organic Chemistry I (WCH11)

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Revision Guide- IAL & GCE Chemistry -UNIT 1 (New Syllabus)
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Revision guide to help students excel in Unit 1 organic chemistry. Contains model answers for questions from past papers based on examiners' reports.

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  • August 5, 2023
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  • 2022/2023
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IAL CHEMISTRY- AS
ORGANIC CHEMISTRY – ALKANES
REVISION GUIDE

Q1. Give two characteristics of a homologous series
• have a common general formula
• differ by a CH2 unit
• show a trend in physical properties, for example boiling temperature
• show similar chemical properties since all members of the same homologous
Q5. Draw the skeletal formula of butan-2-ol
series have the same functional group
Hint: the carbon chain skeleton is shown by zigzag lines, where each end
Q2. What is meant by a functional group?
of a line and each angle represents a carbon atom. Hydrogens attached to
A functional group is a small group of atoms or perhaps a single atom that
other atoms should be shown
determines the chemistry of a molecule.
Q3 . Identify the functional groups in
CH3CH(OH)CH2CH=CH2.
A secondary alcohol and an alkene
Drawing organic molecules
(1) Molecular formula :shows the total number and kinds of atoms in Q6.Draw the skeletal formula of

a molecule, but not their structural arrangement. (a) pent-2-ene;

For example, the molecular formula of ethanoic acid is C2H4O2


(2) Structural formula: an unambiguous formula that shows the relative (b) 2-methylprop-2-ene.
positions of the atoms in a molecule. Side chains are enclosed in brackets.
• The structural formula of propane is CH3CH2CH3
• and that of propan-2-ol is CH3CH(OH)CH3.
• It is advisable to show any double bonds, so the structural
formula of ethene is best written as H2C=CH2.
Q4. Draw the displayed formula of butan-2-ol
Exam hint: shows all the atoms and all the bonds.


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