Rates Of Reaction Flashcards
What are the two general ways to measure rate of reaction?
- rate of reactants being used up
- rate of products being produced
What factors affect rate of reaction
- Concentration of solutions
- Temperature
- SA of reactants in solid state
- Presence of a catalyst
- Pressure (for reactants in gaseous state)
What is collision theory?
- for a reaction to occur, particles must collide with each other
- these collisions must be equal to or greater than the activation energy
- these energetic collisions mean bonds can be broken or formed
How is rate of reaction sped up (collision theory)
- more frequent collisions that meet the activation energy
Why does concentration affect rate of reaction?
Higher concentration of reactants means more reactants in same volume so more frequent collisions and faster rate of reaction
How does surface area affect rate of reaction?
Larger surface area means more area for reactants to collide with (larger area of contact) , so more frequent collisions and faster rate of reaction
How does temperature affect rate of reaction?
Higher temperature means higher kinetic energy, so particles move faster, so more frequent successful collisions and faster rate of reaction
How does pressure (of gases) affect rate of reaction
Higher pressure of gas means more gas particles in same volume, so more frequent successful collisions and faster rate of reaction
How do catalysts affect rate of reaction?
They speed up rate of reaction without being used up by providing an alternate energy pathway that has lower energy than activation energy
What does the gradient show on a RoR graph?
How fast the rate of reaction is
How to calculate RoR from a graph
Change in x
What are the units for rate of reaction?
Cm³/s
