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CHM 151


Define Stoichiometry? The area of study that examines the quantities of substances consumed and produced in chemical reactions.
Chemical Equations A representation of a chemical reaction using the chemical formulas of the reactants and products; a balanced chemical equation contains equal #s of atoms of each element on both sides of the equation.
Coefficients They indicate the relative #s of molecules of each kind involved in the reaction.
Reactants The chemical formula to the left of the ->.
Products The chemical formula to the right of the ->.
Combination Reaction A chemical reaction in which 2 more substance combine to form a single product.
What does the + in a chemical equation mean? Reacts w/
What does the -> in a chemical equation mean? Produces
Combination Reactions 2 or more substances that reacts to form 1 product.
Decomposition Reaction 1 substance undergoes a reaction to produce 2 or more other substances.
Combustion Reactions It is a rapid reaction that produces a flame.
Formula Weight The sum of the atomic weights of each atom in its chemical formula. (Use atomic masses from the periodic table.)
Molecular Weight The mass of the collection of atoms represented by the chemical formula for a molecule.
% Composition % element= (# of atm)(amu)/ FW of compound x 100%
Avogadro's # 6.0221421 x 10^23
Mole (mol) A collection of Avogadro's # of objects.
Interconverting the mass and the # of formula units of a substance. [Grams]->Use molar mass->[Mol]<-Use Avogadro's #-> [Formula units]
Determining the molecular formula from the empirical formula. (Molecular weight or molar mass needed) Whole # multiple= MW/EW
Molar Mass The mass in grams of 1 mol of a substance. (g/mol)
Calculating the empirical formula from percentage composition. [Mass % elements]->Assume 100g sample->[Grams of ea. element]-> Use g/mol->[Mol of ea. element]->Calculate mol ratio->[Empirical formula]
Calculating amounts of reactants or products in a reaction. [Grams of subst A]->Use g/mol of A->[Mol of subst A]->Use coeff of A & B from balanced equation->[Mol of subst B]->Use g/mol B->[Gram of subst B]
Limiting Reactant or Limiting Reagent The reactant is completely consumed in a reaction.
Theoretical Yield The quantity of product that is calculated to form when all of the limiting reactant reacts.
% Yield % yield= actual yield/theoretical yield x 100%
Created by: kalley83