Rates Of Reaction Flashcards
How do you measure rate of reaction?
The rate at which the reactant is used up
The rate at which the product is formed
What factors affect the rate of reaction?
Temperature Concentration Pressure of reacting gases Surface area of reacting solids Use of a catalyst
Why do chemical reactions happen?
When reactant particles collide with enough energy.
The more frequently particles collide, the greater the amount of successful collisions the greater the rate of reaction
What is the equation for rate of reaction?
Amount of reactant used or amount of product formed/ time taken
Why may a graph showing rate of reaction be steeper at the start?
It is happening faster because the concentration of reactant is the biggest
Why does concentrations affect the rate of reaction?
There are more reactant particles in the same volume, there is a greater chance of the particles colliding which means more successful collision and a greater rate of reaction
Why does surface area affect the rate of reaction?
More particles are exposed to the reactants
There is a greater chance of the particles colliding
The rate of reaction increases
Why does temperature affect the rate of reaction?
The particles have more energy so move more quickly
More particles have the activation energy
The particles collide more often and with more energy so the rate of reaction increases
Why does a catalyst increase the rate of reaction?
Increases the rate of reaction without being used up
Catalyst lower the activation energy
More collisions result in a reaction
Rate of reaction increases
Why does pressure affect the rate of reaction?
There are more particles in the same volume
Greater chance of them colliding
Increased rate of reaction
