Types Of Chemical Reactions

By: Rita Harkless

Synthesis

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

Equation: A + B ---> AB

Examples: Hydrogen and oxygen reacting to form water.

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Decomposition

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

Equation: AB ---> A + B

Examples: When electricity passes through water, the water decomposes into hydrogen gas and oxygen gas.

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Single Replacement

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

Equation: A +BC ---> B + AC

Examples: Copper wire is submerged in a solution of silver nitrate.

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Double Replacement

Definition: One in which two different compounds exchange positive ions and form into new compounds.

Equations: AB + CD ---> AD + CB

Examples: When potassium iodide solution is poured into a solution of lead (III) nitrate.

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Combustion

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

Equation: CH4 +2O2 ---> CO2 + 2H2O

Examples: A brunsen burner generates heat and light by combustion of natural gas.

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