III.1A compound is a substance composed of two or more different elements that are chemically combined in a fixed proportion. A chemical compound can be broken down by chemical means. A chemical compound can be represented by a specific chemical formula and assigned a name based on the IUPAC system. (3.1cc)
III.2 Types of chemical formulas include empirical, molecular, and structural. (3.1ee)
III.3 The empirical formula of a compound is the simplest whole-number ratio of atoms of the elements in a compound. It may be different from the molecular formula, which is the actual ratio of atoms in a molecule of that compound. (3.3d)
III.4 In all chemical reactions there is a conservation of mass, energy, and charge. (3.3a)
III.5 A balanced chemical equation represents conservation of atoms. The coefficients in a balanced chemical equation can be used to determine mole ratios in the reaction. (3.3c)
III.6 The formula mass of a substance is the sum of the atomic masses of its atoms. The molar mass (gram-formula mass) of a substance equals one mole of that substance. (3.3e)
III.7 The percent composition by mass of each element in a compound can be calculated mathematically. (3.3f)
III.8 Types of chemical reactions include synthesis, decomposition, single replacement, and double replacement. (3.2b).