Controlling Rate Flashcards
What do you need for a successful collision?
The right geometry and a minimum amount of energy called the activation energy.
How can reaction rates increase?
Due to more collisions, harder collisions and lower activation.
How does increasing the temperature increase the rate?
More frequent collisions and harder collisions.
How does increasing the concentration increase the rate?
More frequent collisions.
How does increasing the area of a solid increase the rate?
More frequent collisions
How does increasing the pressure increase the rate?
More frequent collisions
How does adding a catalyst increase the rate?
Lower activation energy allows low energy collisions to be successful.
What is activation energy?
The minimum amount of energy required for a successful collision. Kinetic energy
What does homogenous mean?
When the catalyst and reactants are in the SAME STATE.
What does heterogeneous mean?
When the catalyst and reactants are in a DIFFERENT STATE.
Exothermic
Temperature increase- gives out heat.
Endothermic
Temperature decrease- takes in heat.
What is enthalpy?
The total energy content of the reacting materials. It is given the symbol H
What is enthalpy change ?
The term used to describe the energy exchanges that takes place. It is given the symbol (delta)H.
When calculating energy…
If the answer is positive then the reaction is endothermic
