Chapter 8: Chemical Quantities
Date:____________
Section 1: Defining Stoichiometry - Notes
Objectives:
 Describe the types of relationships indicated by a balanced chemical equation.
 State the mole ratios from a balanced chemical equation.
Particle and Mole Relationships:

Chemical reactions stop when one of the reactants is _______________________.

___________________________ is the study of quantitative relationships between the amounts
of reactants used and amounts of products formed by a chemical reaction.

Using stoichiometry, we can:
o
Predict the amounts of _____________________ that form in a chemical reaction based
on the amounts of _______________________
o
Predict ________________________ of the reactants are necessary to form a given
amount of product
o
Predict how much one reactant is required to __________________________________
with another reactant.

Example: Interpret the equation for the combustion of propane (C3H8) in terms of
representative particles, moles, and mass.

A ___________________ is a ratio between the numbers of moles of any two substances in a
balanced equation.

The number of mole ratios that can be written for any equation is ________________________
where n is the number of species in the chemical reaction.


Practice: Determine all possible mole ratios for the following chemical equations. Balance the
equations if needed.
o
Al(s) +
O2(g) 
o
Fe(s) +
H2O (l) 
Al2O3(s)
Fe3O4(s) +
H2(g)