in this section

Bond lengths and bond energy 

Here you can examine the  effect that multiple bonds have upon the length of the bond.

  • Use the top  of the three buttons ( C-C ) to select the data for a carbon - carbon single bond.
  • The two buttons at the top allow you to view the energy values and the bond length value for the selected bond.  Click each in turn to collect the data for the bond.
  • Repeat the process for the double and triple bond

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​This problem looks at Kp and the values of partial pressures for Sulphur dioxide and oxygen 

​Click to see the presentation

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Batteries or cells? Rechargable o

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​Redox chemistry and equilibria


Chromatography gets its name from the (sometimes) colourful chromatograms it produces.

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OCR syllabus

​Sometimes in organic synthesis there is a need to extend the length of a carbon chain . This can be achieved in a few different ways: 

The NMR facility at Princeton University

This animation shows how hydrogen nuclei can be thought of as tiny bar magnets 

​Proton NMR produces a spectrum with a  number of peaks.  The number of peaks corresponds to the number of different chemical environments in which protons exist.

Use the data provided to work out what this molecule is. It contains carbon, hydrogen and oxygen only.

 High resolution NMR - reveals a splitting pattern

Carbon 13 NMR gives information about the number of and type of chemical environments in which carbon atoms can be found

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 Electronegativity values allow us to predict the direction and strength of dipoles which might exist in molecules

Electronegativity values

Conductivity when molten 

Lithium ions surround chloride ions to form an ionic lattice

Background

  • ​When a metal combines with a non metal - the compound formed is usually ionic.
  • Ionic compounds tend to form giant lattices.
  • Ionic lattices have some distinctive physical properties:

High melting points

Conduct an electric current when molten​

They form crystals

Many will dissolve well in water

The videos, slide shows and activities on this page are intended to help you see some of these properties and relate them to the structures involved 

Video Exercise  : Watch the video and then answer the questions below

Why do ionic compounds conduct when molten?

FMCP !!

A rather more animated explanation from Richard Thornley 

Intermolecular forces are responsible for holding together the two strands of a DNA molecule

Before tackling this topic make sure you are able to:

  • explain the difference between intermolecular and intramolecular forces. 
  • use electronegativity values to work out dipoles within molecules
  • use ideas about molecular shapes and dipoles to predict whether or not a molecule is polar. 


What do these two graphs show?

How do we explain the trends?

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 Hydrogen bonding is responsible for the extraordinary and unique properties of water.

Ice is less dense than liquid water and therefore floats. 


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reducing your carbon footprint

Although this is aimed at students of the IB diploma - it is relevant to all ....

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