AQA Unit 2: Chemistry in Action

Revision notes from the second half of the AS chemistry course including:

  • Energetics
  • Kinetics
  • Equilibria
  • Redox Reactions
  • Group 7, the Halogens
  • Group 2, the Alkaline Earth Metals
  • The Extraction of Metals
  • Haloalkanes
  • Alkenes
  • Alcohols
  • Analytical Techniques
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Chemistry in Action
Table of Contents
Endothermic and exothermic reactions4
Measuring enthalpy changes4
Hess' law5
Enthalpy changes of combustion6
Representing thermochemical cycles6
Bond enthalpies7
Collision theory9
The Maxwell-Boltzmann distribution9
The idea of equilibrium13
Changing the conditions of an equilibrium reaction13
Equilibrium reactions in industry13
Redox reactions15
Oxidation and reduction16
Oxidation states16
Redox equations16
Group 7, the halogens17
The halogens18
The chemical reactions of the halogens18
Reactions of halide ions18
Group 2, the alkaline earth metals20
The physical and chemical properties…read more

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Chemistry in Action
Elimination reactions in haloalkanes30
The formation of haloalkanes30
Reactions of alkenes34
Polymerisation of alkenes36
Alcohols- introduction38
Ethanol production38
The reactions of alcohols38
Analytical techniques40
Mass spectrometry41
Infra-red spectroscopy41
Glossary of Terms42…read more

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Chemistry in Action
Endothermic and Exothermic Reactions
Chemical reactions involve energy transfers associated with:
i) The breaking of bonds (heat taken in).
ii) The making of bonds (heat given out).
The energy change is normally in the form of heat change.
Enthalpy changes can be:
i) Exothermic:
a) Heat given out.
b) H is negative.
ii) Endothermic:
a) Heat is taken in.
b) H is positive.
iii) Are assumed to be at a constant pressure.…read more

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Chemistry in Action
In experiments to find enthalpy changes:
i) A known mass, m, of liquid (normally water) is used to absorb the heat from the
ii) The temperature change, T, is measured.
iii) Constant stirring gives an even distribution of heat.
Enthalpy change is: mcT
Enthalpy of Neutralisation:
This is the enthalpy change when one mole of water is formed by the reactions of strong acid
and strong alkali at 100kPa and 298K.…read more

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Chemistry in Action
Hess' law simply means H1=H2+H3.
Enthalpy Changes of Combustion, Hc
This is the energy given out when one mole of a substance is burned completely in oxygen at
100kPa and 298K.
Combustion is always exothermic.
Note that the enthalpy change of formation of CO2 and the enthalpy change of combustion of
carbon are the same.…read more

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