Reversible Reactions & Rates Flashcards
Rate of reaction equation
Ror (g/s) = product / time
How can you record rate of reaction?
Colour change, mass change, volume of gas given off
Example of slow reactions
Chemical weathering and rusting
Example of fast reactions
Explosions
Explain collision theory
Particles must collide to react. The frequency and energy of particles collisions effect the rate of reaction.
What is Ea?
Activation energy is the minimum amount of energy particles have when they collide
What is a limited reactant?
The reactant that runs out first and brings a reaction to a close first
What are catalysts?
They increase reaction rate without being used up by decreasing the activation energy by finding an alternate path
What are the four ways to increase ror?
⬆️TEMP ⬆️SA ⬆️CONCENTRATION AND CATALYST
How does ⬆️temp affect ror?
Particles have more energy so move more = more frequent collisions and when they collide they have more energy
How does increasing surface area affect ror?
More particles available for collisions = more frequent collisions
Increasing concentration effect on ror.
More particles in given volume = more frequent collisions
What’s a reversible reaction?
The reaction goes both ways
Define equilibrium
When the forward and backwards reaction are the same rate in a closed system
What does the position of equilibrium depend on?
Concentration, temperate and pressure
