1. Chemical Kinetics Basics Factors Affecting Reaction Rates
Kinetics = the field of chemistry dealing with the rate of chemical reactions
A collision must occur between reactants for a reaction to happen
Factors Affecting Reaction Rates
Physical State
2 Ag+(aq) S2O32-(aq) > Ag2S2O3(s)
Ag2S2O3(s) H2O(l) > Ag2S(s) H+(aq) SO42-
-First solid is white, second solid is black/brown
-First reaction involves two liquids; Second involves a solid and a liquid
-Will also test the affect of temperature on the speed of this reaction

2. Concentration
Mg(s) HCl(aq) > MgCl2(aq) H2(g)
DO THIS REACTION IN THE HOOD; H2(g) is flammable
We will be making 5 different concentrations of HCl
2 ml 1.0 M HCl ml H2O = 0.2 M HCl
4 ml 1.0 M HCl ml H2O = 0.4 M HCl
etc...

3. Surface Area
Zn(s) HCl(aq) > ZnCl2(aq) H2(g)
DO THIS REACTION IN THE HOOD; H2(g) is flammable
We will run the reaction twice, with different size Zn particles
Smaller particles have more surface area

4. purple colorless d. Temperature
2MnO4-(aq) + 5C2O42-(aq) H+(aq) > 2Mn2+(aq) CO2(aq) + 8H2O(l)
purple colorless
We will run the same reaction at 25 oC, 40 oC, 55 oC, and 70 oC
Room temp. will be slow, stop it after 15 min (record > 15min as time)
Catalyst
A catalyst speeds up a reaction without being used up itself
It works by lowering the Activation Energy
Mn2+ catalyzes the reaction (Autocatalysis); add some and time reaction