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Balancing equations

Symbol equations show the reactants and the products
when a chemical reaction takes place.

We always show the reactants on the left of the arrow, and
the products on the right of the arrow.

There are many things they don't say, such as how quickly a
reaction takes…

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two oxygen atoms on the left side, as compared to three on
the right side. This clearly doesn't match.

We can balance the equation by multiplying the different
atoms and molecules on each side by different amounts.
Firstly, multiply the aluminium atoms on the left side by 4:

4Al +…


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