Chemical Reaction Types

Indications of a chemical reaction:

Production of a gas, change in color, formation of a precipitate, and change in temperature

Exothermic

Reaction that releases heat, feels warm or hot to touch

Endothermic

Reaction that absorbs energy, feels cold to touch

Number of atoms =

Subscript x coefficient

Synthesis Reaction

A + B → AB

Metal Oxides + Water →

Metal Hydroxides

Nonmetal Oxides + Water →

Oxyacids

Metal Oxides + Nonmetal Oxides →

Salts

Decomposition Reaction

AB → A + B

Metal Carbonates →

Metal Oxide + Carbon Dioxide

Metal Chlorates →

Metal Chloride + Oxygen Gas

Medal Hydroxides →

Metal Oxides + Water

Oxyacids →

Nonmetal Oxides + Water

Single Replacement Reaction

A + BC → AC + B

Double Replacement Reaction

AB + CD → AD + CB

Most double replacement results reaction is

Formation of a precipitate, water (neutralization reaction), gas (H₂S, HCN, CO₂)

Formation of water (neutralization reaction)

Reaction between an acid and a base or produces a salt (ionic compound) and water

In a neutralization reaction,

water and salt are always the products

Formation of a precipitate

Double replacement reaction produces a solid and an aqueous compound

The reaction will not occur if

both products are soluble (results in free ions in a solution) = NR

Combustion Reactions

Substances react with oxygen and hydrocarbon and the products will always be carbon dioxide and water