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Atomic Foundations of Matter
Laws, bonding, formulae & mass
9.1
Law of Conservation of Mass
Mass before equals mass after; matter is only rearranged.
9.2
Law of Constant Proportions
A compound has a fixed mass ratio; water is 1 to 8.
9.3
Dalton’s Atomic Theory
Indivisible atoms combine in simple whole-number ratios.
9.4
How Atoms Combine?
Covalent (share) and ionic (transfer) bonds; molecules and ions.
9.5
Writing Chemical Formulae
Criss-cross valencies or charges; simplest ratio; brackets.
9.6
Properties of Ionic & Covalent Compounds
Solubility and conductivity depend on the bond type.
9.7
Molecular Mass of Covalent Compounds
Add the atomic masses of all atoms in a molecule.
9.8
Formula Unit Mass of Ionic Compounds
Add the atomic masses in one formula unit.
