01:160:162 Lecture Notes - Lecture 4: Chemical Kinetics, Stoichiometry
25 Jul 2017
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Chemical kinetics (cid:1543) study of rates / speeds of reactions. Certain reactions are fast, others are slow (combustion = fast, diamond into carbon = slow) ex. putting fish in refrigerator slows down the rotting process. Collision model (cid:1543) reaction takes place between particles when they collide. Matter on atomic level is in constant motion. During collision, bonds can be broken and new bonds can be made. Any factors that increase frequency and/or e of collisions between particles will increase rate of reaction. Several factors will impact the speed of reaction (1) concentration of reactants. Higher [reactant] (cid:1543) more frequent collisions (cid:1543) faster rate (2) temperature of reaction. Higher t (cid:1543) more energetic collisions (cid:1543) faster rate. Enough e must be supplied to break bonds (3) structure and relative orientation of colliding particles. Colliding particles must sometimes approach each other in a specific way ex. H (g) + hcl (g) (cid:1543) h2 (g) + cl (g)
