Available online
Description
Collision theory and Transition State theory which predict the rate of constants of molecular reactions are examined and compared.
Collision theory and Transition State theory which predict the rate of constants of molecular reactions are examined and compared.
| Module code and title: | ST294, Principles of chemical processes |
|---|---|
| Item code: | ST294; 12 |
| First transmission date: | 02-08-1975 |
| Published: | 1975 |
| Rights Statement: | |
| Restrictions on use: | |
| Duration: | 00:24:07 |
| + Show more... | |
| Producer: | Andrew Millington |
| Contributors: | Charles Harding; David Roberts |
| Publisher: | BBC Open University |
| Keyword(s): | 3D geometric model; Animation; Collision theory; Constants; Hydrogen atoms; Hydrogen molecules; Linear collision; Molecular reactions; Ridge; Transition state theory |
| Footage description: | Animated diagram shows molecules in motion. David Roberts introduces the programme. He very briefly compares collision theory with transition state theory using the reaction H1-H2+H3 - H1+H2-H3. Animated diagram of gas molecules in motion. David Roberts explains the collision theory and describes the data needed to utilize the theory. Several prepared captions and an animated diagram are used. Roberts points out the shortcomings of using collision theory. Charlie Harding explains how transition state theory works and points out the variables involved. He limits the problem to linear arrangements of H1- H2 - H3 reaction. Harding uses a model of a potential energy surface for the H1 - H2 - H3 reaction to continue his explanation of transition state theory. The model corresponds to a simple linear collision and the ridge represents the transition state. Harding, with a contour diagram of the potential energy surface identifies the reaction coordinate. He explains how the concentration of activated complexes and rate constants are calculated. The equations are captioned. David Roberts applies collision theory to several reactions. These are shown on prepared captions. A graph shows the values for log A. Charlie Harding applies transition state theory to the above reactions. He uses the model of potential energy surfaces and contour surface maps as well as animated diagrams to illustrate his discussion. Roberts uses several graphic aids to compare the effectiveness of the two theories. |
| Master spool number: | 6HT/71667 |
| Production number: | 00525_1164 |
| Videofinder number: | 752 |
| Available to public: | no |
