Oxidation Numbers and Equations
The concept of oxidation and reduction is explained and generalised using oxidation numbers with ionic and covalent examples. Several equations are balanced, using the oxidation number method to fix various atomic ratios.
More details | Watch nowCrater Formation in Sand
A description and demonstration of the way in which craters formed by dropping objects into sand can be linked to some elementary physics
More details | Watch nowEstimation – Educated Guesswork?
How can we make sensible estimates of very large numbers? It is often very important to know the size of an unknown number, at least to within a factor of ten.
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All numbers are not equal
An introduction to the various types of numbers which are recognised as important.
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An approach to adding and subtracting fractions, using an understanding of the processes involved.
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How can we represent fractions in the simplest way? Equivalence of decimal and common fractions.
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Making life easy when using percentages. A sometimes fraught topic looked at differently.
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