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A prefix is a type of affix attached to a stem which modifies the meaning of that stem. Pre means before.

Prefixes can be used to help students undersand the meanings of science words and build there vocabulary.

Probably prefix comes before a word.
Please feel free to ask me anymore questions.
Thanks

add any substance to baking soda and the whole thing will explode

that's a great question. A prefix and a suffix in scientific terms actually helps you define a scientific word and are usually latin. This is a great site that goes over many of them including meaning.

http://www.carolina.com/apscience/prefix_suffix1.asp