Chem112 Day 6.docx - Chemistry 112 – Day 6 Chapter 12 –...

Chemistry 112 – Day 6 (09/16/2019)
 Chapter 12 – Kinetics
o The study of kinetics explores the rate or a reaction
o How fast does it go?
 In contrast to equilibrium which answers how far does it go
o By looking at how fast a reaction goes and how its rate changes with certain
variables, we can propose rate mechanisms.
 Reaction Rate
o Change in relation to time
o For chemistry we usually use the change in conc. Of something over a certain
time period.
o Rates by convention are always expressed as a positive value.
o 4 general factors that we can control to manipulate the rate of a chemical
reaction.
 Influencing the Rate
o Concentration
o Physical State
o Temperature
o Catalysts
 Expressing the Rate
o Reactant concentrations decrease while product concentrations increase
 For A  B
o Rate of reaction = -
Change ∈ concentration of A
Change ∈ Time
= -
conc A 2 − Conc A 1
t 2 − t 1

Δ ( conc A )
Δt
o How would you express this in terms of the product?