Glossary

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Looking for a quick definition?

We’ve got loads of key subject terms in our subject glossaries. There are three ways of finding what you are looking for:

  • First click on the letters of the alphabet to browse for terms.
  • Select a subject from the drop-down menu above to filter the terms by Subject.
  • Or lastly, type the term you are looking for into the search box.

EXAMPLES

Here are some examples of the kinds of definitions you’ll find on this page.

two species that differ from each other by a single proton (H+ ion). An acid becomes its...

no atoms are gained or lost during a chemical reactions.

no energy is gained or lost during a chemical reaction.

in a chemical reaction no mass is gained or lost when substances react to form new products....

reactant molecules are in contact with the solid catalyst.

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