Collision Theory & Potential Energy Flashcards
Why might particles with sufficient activation energy still not react?
They don’t have the correct orientation
What way would a kinetic energy graph move if the temperature is increased?
Right
What way would a kinetic energy graph move if the temperature is decreased?
Left
What is the effect of increasing temperature on collision theory?
An increase of temp causes the particles to speed up causing more frequent collisions, and insures more particles have sufficient activation to react however it does not effect orientation
What is the effect of increasing concentration on collision theory?
There are more frequent collisions as the particles are closer together therefore result in more collisions if they have the correct orientation.
What is the effect of catalysts on collision theory?
Catalysts lower the activation energy, this means that the number of particles able to react have increased. Catalysts also hold particles in place with the correct orientation so more particles react.
What is the effect of increasing pressure on collision theory?
More pressure means the particles are closer together as they are under pressure therefore, are more likely to collide and react if they have correct orientation and sufficient activation energy.
How does surface area effect kinetic energy diagrams?
It does not effect them.
What is the effect of surface area on collision theory?
Increase of surface area means that more surfaces are available for particles to react with, resulting in more collisions if particles have correct orientation and activation energy.
How do you work out the relative rate?
1 divided by change in time
Where do chemicals store potential energy?
In their bonds
Bonds
Where chemicals store their chemical energy
Enthalpy (🔺H)
The difference in energy stored.
What is the amount of energy in bonds not effected by?
Concentration, temperature or pressure
Exothermic reaction
When the products store less energy than the reactants. The enthalpy is ➖.
