Types of Chemical Reactions

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Synthesis Reaction

Definition: A reaction in which two or more substances react to form a single substance.

Equation: A + B -> AB

Examples: H2 + O2 -> H2O

Decomposition Reaction

Definition: The opposite of a synthesis reaction. A reaction in which a compound breaks down into two or more simpler substances.

Equation: AB-> A+B

Examples: NaCl-> Na + Cl

Single Replacement Reaction

Definition: Is a reaction in which one element takes the place of another element in a compound.

Equation: A + BC -> B + AC

Examples: F2 + NaCl -> Cl2 + NaF

Double Replacement Reaction

Definition: Is one in which two different compounds exchange positive ions and form two different new compounds.

Equation: AB + CD -> CB + AD

Examples: H2SO4 + NaCl -> Na2S04 + HCl

Combustion Reaction

Definition: Is one in which a substance reacts rapidly with oxygen, often producing heat and light.

Equation: CH + O2 -> CO2 + H2O

Examples: CH4 + 2 O2 -> CO2 + H2O