Unit 1 - Reaction Rates Flashcards
Why does the reaction get slower as it proceeds?
The reactants are being used up
How is relative rate calculated?
Rate = 1/time
What effect does increasing concentration have on a reaction rate?
It will increase
Why does increasing concentration increase the reaction rate?
There will be more reactant molecules & more collisions
What effect does decreasing particle size have on reaction rate?
It increases reaction rate
Why does decreasing particle size increase the reaction rate?
It increases the surface area meaning more reactant particles are able to collide
What will a 10 degree rise In temperature do to reaction rate?
Roughly double it
What is activation energy?
The minimum kinetic energy required by colliding molecules for a reaction to take place
What effect does increasing temperature have on reaction rate?
It increases reaction rate
Why does increasing temperature increase the reaction rate?
It increases the number of molecules which possess the necessary activation energy to react
What is a catalyst?
A catalyst is a substance which speeds up a chemical reaction without being used up in the reaction
How does a catalyst work?
It provides an alternative pathway with a lower activation energy
What is a homogeneous catalyst?
A catalyst which is in the same physical state as the reactants
What is a heterogeneous catalyst?
A catalyst which is in a different physical state to the reactants
Where does catalysis occur?
Active sites on the surface of the catalyst
