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Problem solving in chemistry using proportional reasoning

The use of proportional reasoning allows the solution of problems from first principles and eliminates the need to memorise a large number of formulae.

Proportional reasoning is a facility that is used not only in the physical sciences but in everyday life.

Here are some examples of proportional reasoning applied to problems in Chemistry, by Jennifer Searcy.

Density	Specific heat	Elements, atoms and moles
Molecules, compounds and moles	Empirical and molecular formulae	Dissociation
Solutions	Stoichiometry	Percentage composition
Gases	Balancing equations

Here are some chemistry problems which do not use proportional reasoning, by Jennifer Searcy.

Isotopes

Chemistry Test and Exam questions and answers

Writing Chemical Equations

A chemical equation is perhaps the most important statement that can be made in the language of chemistry, and it has a vocabulary and grammar which should be thoroughly understood.

Here is a tutorial on writing chemical equations, by Dr Dion Giles.

Writing Chemical Equations

Organic Chemistry

There are several times more carbon-containing (organic) compounds than there are compounds of all the remaining elements combined. Here is a tutorial on organic chemistry, by Mark Ellison.

Organic Chemistry

Welcome to Chemistry

Software giving a useful introduction to chemistry for younger students

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