Types of Chemical Reactions

A combustion reaction is a chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light and heat. Example: $$C_{11}H_{24} + 17O_2 -> 11CO_2 + 12H_2O$$ .

A synthesis reaction, also known as a combination reaction, occurs when two or more substances combine to form a single product. Example: $$2NH_3 + H_2SO_4 -> (NH_4)_2SO_4$$ .

A decomposition reaction occurs when a single compound breaks down into two or more simpler products. Example: $$2H_2O -> 2H_2 + O_2$$ .

A single replacement reaction occurs when one element replaces another element in a compound. Example: $$Zn + 2HCl -> ZnCl_2 + H_2$$ .

A double replacement reaction occurs when the anions and cations of two different compounds switch places, forming two new compounds. Example: $$AgNO_3 + NaCl -> AgCl + NaNO_3$$ .

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation.

The balanced equation is $$2Al + 6HCl -> 3H_2 + 2AlCl_3$$ .

You need 2 water molecules to balance the equation.

A reactant is a substance that undergoes a chemical change in a reaction. Reactants are found on the left side of a chemical equation.

A product is a substance that is formed as a result of a chemical reaction. Products are found on the right side of a chemical equation.