Chemistry: (e) Kinetics and Thermochemistry
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study of speed or rate of reaction under various conditions
For two molecules to collide, they must...
- 1) collide in an effective way
- 2) have energy as grat as activiation energy
What is activation energy?
Energy that gets reaction going
What five factors affect reaction rate?
- concentration of R
- surface area of R
- reaction mechanism
What is the reaction mechanism?
sequence of reactions leading to overall reaction
What is the rate determining step?
slowest step of mechanism
What is the enthalpy of a reaction?
heat transferred into or out of a system
What is an exothermic reaction?
reaction that releases energy
What is an example of an exothermic reaction?
charcoal like substance precipitate reaction
What is an endothermic reaction?
heat is taken in
What is an example of an endothermic reaction?
the beaker frozen to the block demonstration
What does a catalyst do and how does it do it?
speeds up reaction by lowering activation energy.
With a catalyst, does the change in energy (delta H) change?
no, it just happens faster
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