Types of chemical reactions

by: Jackson Pendle

Synthesis

A reaction in which two or more substances react to form a single substance. The reactants may be either elements or compounds


A + B ------> AB

Examples

1) Sodium reacting with Chlorine


2) Oxygen and Hydrogen reacting to form water


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Decomposition

A reaction in which a compound breaks down into two or more simpler substances. The reactant must be a compound.


AB ------> A + B

Examples

1) When electricity passes through water


2) The making of cement

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Single Replacement

A reaction in which one element takes the place of another element in a compound


A + BC --------> B + AC

Examples

1) Dipping a coil of copper wire into silver nitrate and water


2) Potassium reacting with water

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Double Replacement

Two different compounds exchange positive ions and form two new compounds


AB + CD --------> AD + CB

Examples

1) When lead nitrate and potassium iodide are mixed

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Combustion

When a substance reacts rapidly with oxygen, often producing heat and light

Examples

1) The burning of natural gas


2) The combustion of methane