Rate Of Reaction Flashcards
What is activation energy?
The minimum energy needed for a reaction to take place.
How does a catalyst work?
It provides a different reaction pathway with a lower activation energy.
What is a reversible reaction?
When the products can re-form to make the reactants.
What is equilibrium?
When the rate of the forward reaction equals the rate of the backward reaction.
How do you calculate the mean rate of reaction?
Amount of reactant used or product formed / time
What are 3 possible units for rate?
g/s, cm3/s, mol/s
Why does an increase in concentration increase rate?
Particles are closer together so more successful collisions.
Why does an increase in surface area increase rate?
More reactant exposed so more successful collisions.
Why does an increase in temperature increase rate
Particles move faster so more collisions with enough energy to react.
How do you calculate exact rate from a graph?
Draw a tangent to the point you want to measure the rate and calculate the gradient by doing ‘change in y / change in x’.
What is Le Chatelier’s principle?
If reaction conditions are changed, the equilibrium will shift to counteract the change.
