Predicting Products

When Predicting Products Write formulas for the reactants Determine what kind of reaction it is Write formulas for the products based on type of reaction Balance the equation

Don’t forget diatomic elements!!! H2, N2, O2, F2, Cl2, Br2, and I2 Elements that when found free in nature are 2 atoms bonded together Will have other subscripts when in compounds but not when alone

Synthesis Usually the reactants will be single elements Product is 1 compound made of the reactants Use the rules we learned earlier for writing formulas Sodium reacts with chlorine Magnesium + oxygen

Decomposition Will have only 1 reactant Products are smaller pieces of the original Usually just the elements See exceptions next 2 slides Mercury oxide + heat Water + electricity

Decomposition of Metal Carbonates Any metal bonded with CO3 When heated makes metal oxide (metal bonded to O) and CO2 Calcium carbonate decomposes

Decomposition of Metal Hydroxides Any metal bonded to OH When heated makes metal oxide and H2O Calcium hydroxide + heat

Combustion Reactants are organic compound and O2 Products are always CO2 and H2O Propane + oxygen Octane + oxygen

Single Displacement Reactants are free element and a compound In products free element replaces the ion most like it in the compound Must refer to the activity series Aluminum + zinc II chloride Magnesium + hydrochloric acid

Single Displacement cont’d iron + potassium chloride Sodium nitride + oxygen

Double Displacement Reactants are usually 2 ionic compounds Products are 2 ionic compounds where the cations have traded places Potassium fluoride + calcium bromide Hydrochloric acid + sodium hydroxide