Educator

Balancing Equations, Limiting Reagents, Percentage Yield

• Chemical equations show what happens in a reaction

• Equations must be balanced in numbers and kinds of atoms

• Practice balancing equations including complete combustion of C, H, O compounds in oxygen: products are carbon dioxide and water.

• Use balanced chemical equations and moles to calculate relative masses of compounds that react: called stoichiometry

• Redox: type of reactions where electrons are lost (ox or oxidation) or gained (red or reduction)

• Reactions may be run where amounts of reagents aren’t exactly according to stoichiometry; there may be a reagent that limits amount of product – limiting reagent

• Percentage yield of any reaction is based on limiting reagent and = actual yield/theoretical yield x 100%