rate of reaction Flashcards
How does surface area increase the rate of reaction?
The larger the surface area the more space for the particles to collide, meaning more collisions=more succesful collisions.
How does temperature affect the rate of reaction?
The more temperature, the more energy the particles have meaning more collisions that will overcome the activation energy barrier (more successful collisions), which leads to a higher rate of reaction.
how does a catalyst affect the rate of reaction?
The catalyst makes the particles require less energy to overcome the activation energy barrier, this means that more particles with a lower energy can overcome the activation energy barrier and that means more successful collisions.
What is equilibrium?
When a reaction and its reverse are a equal rates, so no overall change is taking place (in a sealed container where no reactants can escape)
What are reverse reactions?
e.g ice, is heated to make water and frozen to make ice, one is exothermic and the other its opposite (endothermic)
What happens when you change the concentration of a substance when it is at equilibrium?
There will be no more equilibrium, so the opposite substance will change according to the original change until it reaches equilibrium.
What happens when the temperature is changed for an equilibrium reversible reaction?
e.g 2NO2- N2O4 if the move to the right is exothermic and the move to the left is endothermic, when the temperature is increased more N2O4 is made to reinstate the equilibrium.
What happens when you increase or decrease the pressure in a reversible reaction that is at equilibrium?
When you increase the pressure, the equilibrium moves to the side with the smaller amount of molecules. When you decrease the pressure, the equilibrium shifts to the side with the more molecules.
What happens when you increase or decrease the pressure in a reversible reaction that is at equilibrium?
When you increase the pressure, the equilibrium moves to the side with the smaller amount of molecules. When you decrease the pressure, the equilibrium shifts to the side with the more molecules.
