Please identify an equation for the following reactions, balance each, and give the reaction type. solid potassium and oxygen gas react to form...

Please identify an equation for the following reactions, balance each, and give the reaction type.

a. solid potassium and oxygen gas react to form potassium oxide

b. solid sodium and water react to form aqueous sodium hydroxide and hydrogen gas

c. iron and oxygen gas react to form iron (III) oxide

d. Phosphorus solid and chlorine gas react to form phosphorous trichloride