Unit One- Controlling The Rate Of Reaction Flashcards
What happens when reactants collide?( come in contact with each other)
Form products
For a faster reaction with more collisions, should a concentration be low or high?
Higher the concentration the more collisions and so the faster the reaction
A smaller particle size means a bigger surface area so….
Higher the chance of collision
What is an Activation energy( Ea)?
Is the minimum amount of energy required before collisions can be successful and lead to products
How does increasing the temperature result in more successful collisions and an increase in rate?
As increasing the temperature increases the number of particles with energy equal to or greater than Ea which results in more successful collisions and an increase in rate
Energy distribution graphs are drawn because?
To show how increasing the temperature results in more particles with energy equal to or greater than the Ea
What is the equation of finding the relative rate?
Rate= 1/Time
Rate of reaction is proportional to…
The concentration of reactants
Rate of reactants is not directly proportional to …
Temperature as a small increase in temperature results in a large increase in rate.
What has an effect on reaction rate also?
Collision Geometry
What can be drawn to show how the potential energy changes as a reaction progresses?
Reaction profiles
What is the name given to stores energy in chemicals and what is it’s symbol?
Enthalpy and H
△H- what does this mean?
Is the change in enthalpy for a reaction and is measured in KJ or KJmol-1 when one mole of a substance is reacted or produced
△H and Ea can both be identified in a reaction profile for…
Exothermic and Endothermic reactions
For an exothermic reaction △H values are…
Negative
