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2.  A + B  AB  Just combine the 2 compounds or elements  Check the charges on ionic compounds  Ex. Calcium reacts with bromine

3.  AB  A + B  Break apart the reactant  Check for ionic compounds and diatomic elements  Ex. Strontium phosphate decomposes

4.  C x H y + O 2  CO 2 + H 2 O  ALWAYS YIELDS CARBON DIOXIDE AND WATER  Ex. Methane (CH 4 )gas combusts

5.  A + BC  B + AC  Like replaces like (metal replaces metal)  Take just the element, not the subscript (unless it is a polyatomic ion)  Check charges and diatomic elements  Ex. Sodium reacts with Calcium oxide

6.  AB + CD  AD + CB  Like replaces like  Take just the element or compound, not subscript  Check charges  Ex. Magnesium nitrate reacts with beryllium phosphide

7. 1. Aluminum + iron (III) oxide 2. Sodium + hydrogen 3. Calcium chloride + manganese (II) iodide 4. Propane (C 3 H 8 ) combusts 5. Hydrogen peroxide decomposes (catalyzed by manganese)