What is a common redox reaction you know of? 9/8 Question of the Day What is a common redox reaction you know of? Oxidized copper on coating of statue of liberty. Corrosion of metal – loses electrons

Oxidation  lose electrons; e.g. metals lose electrons to oxygen Reduction  gain electrons; e.g. the oxygen receives electrons from metals OIL RIG

LEO GER Loses Electrons Oxidation Gains Electrons Reduction

Assigning Oxidation numbers +2 -6 +1 +4 -2 Na2SO3

Oxidation Numbers: Rules Elemental form= 0 (e.g. H in H2) Monatomic ion= charge (e.g. S2-) Nonmetals= usually negative (e.g. O=-2, H=+/-1, F=-1) Sum of oxidation numbers = 0 (e.g. NaCl) UNLESS polyatomic ion then = charge

Displacement Reactions

Activity series List of metals arranged by ease of oxidation – see table 4.5 (p. 144)

Concentration  amount of solute dissolved in a given quantity of solvent

It should be noted that… Concentrations of ions from an electrolyte substance is dependent on chemical formula 1.0 M Na2SO4 2.0 M Na+ 1.0 M SO4-

Dilution  obtaining lower concentrations by adding water

Homework – Due 9/11 4.47-4.51, 4.55 4.63, 4.67, 4.68 4.81

Solution Stoichiometry & Chem Analysis Recall Stoichiometry  relative quantities of reactants and products Titration  process to determine the conc. Of a particular solute by combining unknown with a standard

Equivalence point point at which stoichiometrically equivalent quantities are brought together

Solve a solution concentration problem in a titration together…