Types of Reactions

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What is a Decomposition Reaction?

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A reaction where one compound breaks down into two or more simpler substances.

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Example of a Decomposition Reaction: NiCl2 → Ni + Cl2

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This reaction shows the breakdown of Nickel(II) chloride into Nickel and Chlorine.

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What is a Synthesis Reaction?

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A reaction where two or more simple substances combine to form a more complex substance.

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Example of a Synthesis Reaction: H2 + O2 → H2O

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This reaction shows the combination of Hydrogen and Oxygen to form Water.

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What is a Single Displacement Reaction?

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A reaction where one element replaces another in a compound.

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Example of a Single Displacement Reaction: 3Ca + 2AlCl3 → 3CaCl2 + 2Al

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Calcium displaces Aluminum in Aluminum chloride.

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What is a Double Displacement Reaction?

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A reaction where two compounds exchange ions or bonds to form two new compounds.

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Example of a Double Displacement Reaction: AgNO3 + NaCl → AgCl + NaNO3

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Silver nitrate and sodium chloride exchange components to form silver chloride and sodium nitrate.

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What is an Exothermic Reaction?

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A reaction that releases energy in the form of heat or light.

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Example of an Exothermic Reaction: Combustion of fuels

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Burning of wood or fossil fuels releases heat and light.