UTF-8Chemical Reactions: Energy255255192BOND FORMATION
Anytime a bond is formed, potential energy of the interacting atoms is converted into kinetic energy of the surrounding atoms or molecules. The model below contains many separate atoms in an isolated container that will react by forming single bonds (Reaction 2A-->A2). To the right of the model you can find graph that will display the temperature of the system as a function of time. To the left of the model you can find a controller that will allow you to set the value of the bond dissociation energy for a pair of bonded particles. Experiment with the model to determine the relationship between bond dissociation energy and changes in temperature of the system.
EXPERIMENTING WITH THE MODEL
1. Adjust the dissociation energy of the bond that will form. (Drag up and down the small white square on the left-hand graph)
2. Run the model.
3. Analyze changes in the temperature of the system.
4. Reset the model, and repeat the above steps, but change the bond dissociation energy to some different value.
What evidence do you have that supports the idea that potential energy is converted into
kinetic energy when bonds are formed during a chemical reaction?
What is the relationship between the amount of potential energy that is transformed into
kinetic energy and the dissociation energy of the bond that is formed?
If potential energy is converted into kinetic energy when bonds form, what do you
think will happen to the temperature of a substance if bonds start breaking without external supply of energy?
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