Essential Chemistry Formulae Rules?

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New member
I don't know how to word it, but like, what are some essential Chemistry equation rules? Like in Maths, we have "y=mx+c" to work out the gradient and y-intercept etc, how do we work out some rules for Chemistry?

For example, one Chemistry one is "metal oxide+carbon --> metal+carbon dioxide".

Any other ones? Thanks.
 
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