Description of reactions by chemical equations
A chemical equation is the symbolic representation of a chemical reaction. Conventions for writing chemical…
Stoichiometry
Oxidation Number
The oxidation number is the effective charge on an atom in a compound; the oxidation number is…
Metric Units Commonly Used in the Context of Chemistry
Important units used in the context of chemistry, especially stoichiometry, are grams, moles, liters, centimeters,…
Molecular Weight
The molecular weight of a total mass of atoms in a molecule, represented by grams…
Density
The density of an object represents its “compactness”, or mass per given volume of a…
Description of composition by percent mass
The percent composition of compounds is the percent by mass of each element in a…
Empirical versus Molecular Formula
The molecular formula indicates the actual number of atoms in a compound; The empirical formula indicates…
Mole concept, Avogadro’s number NA
A mole is a unit in chemistry that defines the number of elemental entities in…