Conservation of Matter and Stoichiometry

The conservation of atoms in chemical reactions leads to the principle of conservation
of matter and the ability to calculate the mass of products and reactants. As a
basis for understanding this concept:
a. Students know how to describe chemical reactions by writing balanced equations.
b. Students know the quantity one mole is set by defining one mole of carbon 12
atoms to have a mass of exactly 12 grams.
c. Students know one mole equals 6.02Ê´Ê1023 particles (atoms or molecules).
d. Students know how to determine the molar mass of a molecule from its chemical
formula and a table of atomic masses and how to convert the mass of a molecular
substance to moles, number of particles, or volume of gas at standard temperature
and pressure.
e. Students know how to calculate the masses of reactants and products in a chemical
reaction from the mass of one of the reactants or products and the relevant
atomic masses.
f.* Students know how to calculate percent yield in a chemical reaction.
g.* Students know how to identify reactions that involve oxidation and reduction and
how to balance oxidation-reduction reactions.