Chemistry 8D

​Types of Reactions

• A majority of reactions can be classified by how a chemical change takes place.​

• If we group similar reactions, this can lead to a simpler way to that can help us better understand reactions.​

• The major categories of chemical reactions are synthesis, decomposition, single replacement, and double replacement reactions.

Chemistry | 11th​

​Synthesis Reactions

• Synthesis reactions combine two or more substances into a single product.

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​A + B -----> AB.

Subject | Subject

​Decomposition Reactions

This is the opposite of a synthesis reaction.

• While synthesis reactions combine substances, decomposition reactions break substances down into two or more simpler substances.​

​AB -----------> A + B

​Single Replacement Reactions

• In single replacement reactions, a reactive element replaces a less reactive element in a compound.

  These can also be known as displacement or substitution reactions. They occur frequently in solutions and involve less energy than synthesis or decomposition reactions.

​A + BZ ---------> B + AZ

The more reactive elements force the less reactive elements from the bond.​

Chemistry | 11th

​Double Replacement Reactions

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• ​In double replacement reactions, two compounds switch partners.

​AY + BZ ---------> AZ + BY

Chemistry | 11th