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December 9, 2017

Sulphuric Acid is reduced by Iodide ions to form Sulphur Dioxide and Iodine.  

Reduction Half Equation 

H2SO4        ---------->      SO2 

1. Balance the species that have been oxidised or reduced.

In this case the sulphur has been r...

December 9, 2017

How to calculate the limiting reagent in A Level Chemistry

Electron Energy Level Filling

Atoms

Remember for atoms fill the 4s before 3d...

1s2s2p3s3p4s3d..(In order of increasing energy)

So Calcium (20 electrons)...

1s2 2s2 2p6 3s2 3p6 4s2

And Scandium (21 electrons)

1s2 2s2 2p6 3s2 3p6 4s2 3d1

What about ions?


There are two ways of l...

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