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Types Of Chemical Reactions

There are five types of chemical reactions.
  1. Combination reaction
  2. Combustion reaction
  3. Decomposition reaction
  4. Displacement reaction or single-replacement reaction
  5. Metathesis reaction or double-replacement reaction

Combination Reaction

A reaction involving the formation of a compound from two or more substances is called a combination reaction.

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Combustion Reaction

A combustion reaction involves the reaction of substances with oxygen, and it is usually accompanied by the release of large amounts of heat. Combustion reactions are thus highly exothermic.

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Decomposition Reaction

A decomposition reaction is a process in which one compound decomposes or splits to form two or more simpler compounds and/or elements.

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Displacement Reaction (single-replacement reaction)

In a single-replacement reaction, an element reacts with a compound, and results in the displacement of an element or group from the compound. An example of a single-replacement reaction is shown.

Metathesis Reaction (double-replacement reaction)

A​ metathesis (double-replacement) reaction involves the exchange of two groups or two ions among the reactants. Remember that in a single-replacement reaction, there is only one group or ion being switched. A metathesis reaction can often result in an insoluble product from soluble reactants, and the insoluble compound formed is called a precipitate.

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Note that this reaction involves the formation of a precipitate of AgCl.

With respect to the types of reactions, your objective should be to understand the basis behind the categorization.

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