| A → B | A | B |
|---|---|---|
100 - 0 = 100 | 0 + 0 = 0 | |
| A → B | A | B | B → A |
|---|
100 - 0 + 0 = 100 | 0 + 0 - 0 = 0 | ||
| Equilibrium constant | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| A → B | A | B | B → A |
|---|
100 - 0 + 0 = 100 | 0 + 0 - 0 = 0 | ||
| Equilibrium constant | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||
0 B-molecules at time 0
0 B-molecules at time 0
0 B-molecules at time 0
Chemical Kinetics and Equilibrium
Introduction
On the Kinetics tab, this simulation models the time dependence of a one-way reaction. The rate constant (percent of A converted to B) can be changed to see how this affects the behavior over time.
On the Equilibrium tab, not only does A convert to B, but now B converts to A as well. The rate constants of both reactions can be changed to observe how the rate constants affect the equilibrium amounts and the rate at which equilibrium is approached.
We recommend to start with the Kinetics simulation, then Equilibrium, and then Le Châtelier. Click the "Kinetics" button or tab to begin.
(Instructors: information about how to extend this simulation to demonstrate Le Châtelier’s Principle is presented in the tab.)
The amount of A changes over time as A is converted to B. To see how the amounts of A and B change over time, select the rate of conversion (the percentage) of A that converts to B. Then type in the numbers of A that convert into B at each step.
Not only can A convert into B, but B can also convert back into A. To see how both A and B change over time, select the rates of conversion (percentage) of A → B and of B → A. Then type the numbers of A that convert into B and B that convert into A at each step.
Once A and B have reached the equilibrium, you will be able to change the molecule quantities.
This is called Le Châtelier's Principle. Select a percentage rate to start.
This is called Le Châtelier's Principle. Select a percentage rate to start.
 | Jodye Selco is a Professor of Science Education (in the Center for Excellence in Mathematics and Science Teaching – CEMaST) and Chemistry at California State Polytechnic University Pomona. She is actively involved in research in physical chemistry as well as the teaching and learning of chemistry by all students. Professor Selco has been working with the teachers in Rialto USD for many years and has developed many learning experiences in science for teachers and students in the Rialto USD which have been adopted by many other teachers. |
 | Bo Yeun S. Choi is an instructional designer for eLearning at California State Polytechnic University, Pomona. She provides instructional design to assist faculty in redesigning existing courses or developing new courses for online, hybrid and web- assisted modes of instruction. |
 | Pauline Muljana is also an instructional designer for eLearning at California State Polytechnic University, Pomona. She provides instructional design to assist faculty in redesigning existing courses or developing new courses for online, hybrid and web-assisted modes of instruction. |
 | Erick Zelaya is a multimedia developer for eLearning at California State Polytechnic University, Pomona. He has created many interactive simulations that help faculty demonstrate concepts that are otherwise difficult to explain to students throughout different disciplines. |