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==The Chemical Equation==
==The Chemical Equation==
Chemical reactions can be represented in a concise way using chemical equations. For example, when hydrogen, H<sub>2</sub>, burns it reacts with molecular oxygen, O<sub>2</sub>, in the air to form water, H<sub>2</sub>O. The chemical equation for the reaction is below:
Chemical reactions can be represented in a concise way using chemical equations. For example, when hydrogen, H<sub>2</sub>, burns it reacts with molecular oxygen, O<sub>2</sub>, in the air to form water, H<sub>2</sub>O. The chemical equation for the reaction is below:
==Common Types of Chemical Reactions==
==Common Types of Chemical Reactions==
===Combination reactions===
===Combination reactions===
In a combination reaction two reactants combine to form a single product. Many elements react with one another in this fashion to form compounds.
In a combination reaction two reactants combine to form a single product. Many elements react with one another in this fashion to form compounds.
===Decomposition reactions===
===Decomposition reactions===
A single reactant breaks apart to form two or more substances. Many compounds behave in this fashion when energy is added to the system (heating for example).
A single reactant breaks apart to form two or more substances. Many compounds behave in this fashion when energy is added to the system (heating for example).
===Single Displacement reactions===
===Single Displacement reactions===
One element replaces another in a compound. (The elements are often hydrogen or a metal.)
One element replaces another in a compound. (The elements are often hydrogen or a metal.)
===Double Displacement (metathesis) reactions===
===Double Displacement (metathesis) reactions===
Atoms or ions exchange partners. There are two kinds of reactions of this type, precipitation and acid-base reactions.
Atoms or ions exchange partners. There are two kinds of reactions of this type, precipitation and acid-base reactions.