Chemistry 100 - Review Sheet for Exam #2 (covering Chapters 4, 5, & 7)

Chapter 4: Compounds Valence electrons Electron dot structures Ions Group number versus charge Cations (+) - Na+, Al3+ Anions (-) - O2-, Cl- Octet rule Ionic compounds Postive & negative balance Naming compounds NaCl - sodium chloride FeCl3 - iron(III) chloride Ionic bond Covalent bonds Polar covalent bonds Naming binary covalent compounds Polyatomic ions

Chapter  5: Chemical Reactions Chemical & physical changes Chemical reactions Reactant Products Coefficient Balancing a chemical equations Types of reactions Combination reactions Decomposition reactions Replacement reactions Double replacement reactions Single replacement reactions Combustion reactions Oxidation - loss of electrons Reduction - gain of electrons Mole - Avogadro's number - 6.02 x 1023 Molar mass & calculations Mole-mole conversion factors Using mole-mole factors in calculations Mass calculations

Chapter 7: Gases Pressure Atmospheric pressure Barometer 1 torr = 1 mm Hg 1 atm = 760 mm Hg Vapor pressure Boyle's Law (V=k/P) P1V1 = P2V2 Inverse relationship Charles' Law (V=bT) V1/T1 = V2/T2 Direct relationship Gay-Lussac's Law Avogadro's Law V = an STP Combined gas law P1V1/T1 = P2V2/T2 PV=nRT Partial pressure