1. Why do we consider mechanisms as being a reasonable description of the manner in which chemical reactions occur?
Collision Theory
Zero order reactants explained

2. Rate = k [ ] k temp Rule of Thumb…
An increase of 10°C increases the rate by %!
parameters affecting k will also affect rate
..but even at room temp. and press., in a mixture of two gases, the number of collisions between the particles is large already
~ 1031 collisions per liter per second!!!
Rate = k [ ]
In equation due to collision theory! k
Particles moving faster = more collisions
temp
(they must be effective collisions)
(…must break bonds!)

4. The rate constant for the formation of hydrogen iodide from it’s elements
H2(g) + I2(g) → 2HI(g)
is 2.70 x10-4 mol s at 600.K and 3.50 x 10-3 mol s at 650. K. Find the activation energy for this process.
Ea=166 kJ/mol