Ch 5. Molecules and Compounds - Laney
Chem 30A
Ch 5. Molecules and Compounds
Chemical Formulas of Compounds
1. A given compound always has the same numbers and types of atoms (constant composi;on).
2. Each atom is represented by its element symbol. 3. The number of each type of atom is indicated by a
subscript to the right of the element symbol (Excep;on: If just one atom, no subscript). 4. Typically, the more metallic element is listed first.
Ex Probs
Molecular Compounds and Ionic Compounds
Types of Compounds
Molecular Compounds ? Covalent bond ? One unit: Molecule
Ionic Compounds ? Ionic bond ? One unit: Formula unit
H OH
+?
Chemical Bond
Chemical bond: A force that holds groups of atoms together and makes them func;on as a unit.
? Bonding involves just the electrons of atoms!
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