Science (Chemistry) - Rate Of Reaction Flashcards
(10 cards)
Name all 5 factors that affect the rate of a chemical reaction
Temperature
Surface area
Concentration
Pressure (for gases)
Presence of a catalyst
Define ‘rate of reaction’
The speed at which reactants turn into products in a chemical reaction
Define ‘Activation energy’
The minimum amount of energy that must be available for a chemical reaction to occur
As the temperature of the reactant in a chemical reaction increase…
The particles gain more energy. They collide with more energy and more frequently which increases the rate of successful collisions.
As the concentration/pressure of the reactant increase…
There are more particles per unit of volume. This makes particles collide more frequently with increase the rate of reaction.
As the surface area of the reactant increases…
There is mor area where collisions with the other reactant. This makes the particles collide more frequently which makes the rate of reaction increase.
If catalyst is present…
It provides an alternate reaction pathway. This lowers the activation energy.
What is a catalyst?
Catalyst is a substance that speed up a reaction without being used up by providing an alternate lower energy pathway.
Enzymes are ………… catalysts.
Enzymes are biological catalysts.
What is the theory about how temperature,
concentration/pressure, surface area and catalyst affect the rate of a reaction?
The Collision Theory
