kinetics l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Kinetics PowerPoint Presentation
Download Presentation
Kinetics

Loading in 2 Seconds...

play fullscreen
1 / 6

Kinetics - PowerPoint PPT Presentation


  • 202 Views
  • Uploaded on

Kinetics. Collision Theory: How reactions takes place. Why are kinetics important?. In order to control processes. speed up useful reactions that occur to slowly slow down reactions that are harmful Example:

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Kinetics' - evangelina


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
kinetics

Kinetics

Collision Theory:

How reactions takes place

why are kinetics important
Why are kinetics important?
  • In order to control processes.
    • speed up useful reactions that occur to slowly
    • slow down reactions that are harmful
  • Example:
    • Catalysts are used in our cars to rapidly convert toxic substances into safer substances
    • Refrigerators are used to slow the process of spoiling in food
collision theory
Collision Theory
  • How do reactions occur at the molecular level?
    • Molecules collide with each other
    • Form activated complex
  • Svante Arrhenius
    • Did some fancy math to figure out that number of collisions alone don’t account for reaction rates
    • He found that reactants also require:
      • Activation energy (Ea - energy to break bonds) Animation
      • Right orientation (Animation)
what affects reaction rate
What affects reaction rate?
  • Temperature (Animation)
    • Increased number of collisions
    • More molecules have enough activation energy
    • Remember Maxwell-Boltzmann distribution
      • Increased temperature, distribution flattens out
      • More molecules have Ea
what affects reaction rate5
What affects reaction rate?
  • Higher concentration
    • Number of collisions increased
      • Animation
      • Animation 2
  • Increased surface area
    • Number of collisions increased
    • Animation
what affects reaction rate6
What affects reaction rate?
  • Catalysts
    • Def’n: substance that speeds up a rxn w/o being used up itself
    • Number of collisions with Ea increase
      • Ea lowers
      • Catalysts hold molecules in right orientation
        • Homogeneous catalyst (same phase of matter)
          • Demo: Catalysis by Co2+ (demo)
        • Heterogeneous catalyst (different phase) Animation