Chemical Kinetics and Collision Theory Aim KE1 How do chemical reactions actually happen?
Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates...
Transcript of Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates...
![Page 1: Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates 2016.notebook 3 April 14, 2016 Mar 3 12:21 PM What is kinetics? Kinetics deals with the speed](https://reader036.fdocuments.in/reader036/viewer/2022070210/60fb192de37b79159651ec6a/html5/thumbnails/1.jpg)
Collision Theory and Reaction Rates 2016.notebook
1
April 14, 2016
Mar 312:15 PM
Collision TheoryAim: To identify the conditions necessary for a chemical reaction to occur.
Review Book Topic 8Text book Chapter 17
Unit 11: Kinetics and Equilibrium
Mar 312:21 PM
Collision Theory
Collisions between particles do not always result in a chemical reaction.
A reaction will only occur if there is an effective collision between molecules.
To have an effective collision:1) The reactant particles MUST hit with sufficient energy2) The reactant particles MUST have proper orientation. (Think lock and key model for enzymes)
`
![Page 2: Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates 2016.notebook 3 April 14, 2016 Mar 3 12:21 PM What is kinetics? Kinetics deals with the speed](https://reader036.fdocuments.in/reader036/viewer/2022070210/60fb192de37b79159651ec6a/html5/thumbnails/2.jpg)
Collision Theory and Reaction Rates 2016.notebook
2
April 14, 2016
Mar 312:21 PM
Mar 312:15 PM
Reaction Rate
Aim: What factors affect the rate of a chemical reaction?
![Page 3: Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates 2016.notebook 3 April 14, 2016 Mar 3 12:21 PM What is kinetics? Kinetics deals with the speed](https://reader036.fdocuments.in/reader036/viewer/2022070210/60fb192de37b79159651ec6a/html5/thumbnails/3.jpg)
Collision Theory and Reaction Rates 2016.notebook
3
April 14, 2016
Mar 312:21 PM
What is kinetics?
Kinetics deals with the speed of chemical reactions.
Reaction Rate: the amount of time it takes for a chemical reaction to occur
Reaction rate is increased by an increase in the amount of effective collisions.
Mar 312:40 PM
1) Nature of the Reactants2) Concentration3) Surface Area4) Temperature5) Pressure (only affects gases)
What factors play a role in the speed of a reaction?
6) Addition of a Catalyst
![Page 4: Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates 2016.notebook 3 April 14, 2016 Mar 3 12:21 PM What is kinetics? Kinetics deals with the speed](https://reader036.fdocuments.in/reader036/viewer/2022070210/60fb192de37b79159651ec6a/html5/thumbnails/4.jpg)
Collision Theory and Reaction Rates 2016.notebook
4
April 14, 2016
Mar 312:40 PM
Nature of the Reactants
Certain substances are more reactive than others based on their chemical properties.
Example: Lithium is more reactive than Gold.
The more bonds that need to be broken the slower the reaction rate will be.
Mar 312:40 PM
Concentration
Increasing the concentration of the reactants will result in more collisions because there are more particles.
More collisions= a faster reaction rate (shorter time)
![Page 5: Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates 2016.notebook 3 April 14, 2016 Mar 3 12:21 PM What is kinetics? Kinetics deals with the speed](https://reader036.fdocuments.in/reader036/viewer/2022070210/60fb192de37b79159651ec6a/html5/thumbnails/5.jpg)
Collision Theory and Reaction Rates 2016.notebook
5
April 14, 2016
Mar 312:40 PM
Surface Area
Increasing the surface area of a reactant increases the number of sites where a collision can take place
Greater surface area = more collisions= faster reaction rate (shorter time)
Mar 312:40 PM
Temperature
Increasing temperature causes an increase in the average kinetic energy of molecules.
Higher kinetic energy means the particles move faster
This results in more collisions and a faster reaction rate.
![Page 6: Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates 2016.notebook 3 April 14, 2016 Mar 3 12:21 PM What is kinetics? Kinetics deals with the speed](https://reader036.fdocuments.in/reader036/viewer/2022070210/60fb192de37b79159651ec6a/html5/thumbnails/6.jpg)
Collision Theory and Reaction Rates 2016.notebook
6
April 14, 2016
Mar 312:40 PM
Pressure
A change in pressure only affects gases!
Increase pressure by decreasing the volume.
Less space between particles results in more collisions.
More collisions gives a faster reaction rate.
Jul 95:25 AM
![Page 7: Collision Theory and Reaction Rates 2016.notebook...Collision Theory and Reaction Rates 2016.notebook 3 April 14, 2016 Mar 3 12:21 PM What is kinetics? Kinetics deals with the speed](https://reader036.fdocuments.in/reader036/viewer/2022070210/60fb192de37b79159651ec6a/html5/thumbnails/7.jpg)
Collision Theory and Reaction Rates 2016.notebook
7
April 14, 2016
Mar 312:40 PM
Catalyst
Catalyst: a substance that speeds up a reaction but IS NOT A PART of the reaction.
The catalyst lowers the activation energy. (Less energy needed for an effective collision)
(Ex- Lighter fluid to light charcoals on a barbecue.)
Mar 312:40 PM
In short....
Increasing temperature = ________________________
Increasing concentration = ________________________
Increasing pressure = ____________________________
Increasing surface area = _________________________
Addition of a catalyst = __________________________