Collision Theory
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What is the collision theory?
The likelihood that molecules will hit each other in a way that leads them to react
3 things about collision theory?
1) both molecules must collide 2) both must collide with enough energy 3) Both must collide in the correct 3D orientation
Increasing the temperature also increase _____ and ______?
collision frequency and % of high-energy collisions
The greater the number of collisions per second the greater the chance that the molecules will?
react together
Arrhenius Equation
*Don't memorize, remember relations k=Ae^(Ea/RT) -k= rate constant -R= ideal gas constant 8.314 J/mol-K (different from R=0.0821L-atm/mol-K) -T= reaction temp -Ea= reaction's activation energy
What is the relationship between temperature and rate constant and rate?
Increase temp = Increase rate constant (k) = Increase rate
What is the relationship between reactions activation energy and rate constant and rate?
Increase activation energy (Ea) = Increase rate constant (k) = Increase rate
Why increasing temperature increase a reactions rate and decrease activation energy?
Increasing temp increases the molecules’ speed, which increases the total number of collisions. Increasing temp increases molecules average kinetic energy (because they are moving around more/faster), which increases their ability to overcome activation energy (thus lowering the amount of energy still needed to activate the reaction)