A graph that shows how the energy in a raction changes as the
reactions progresses Basics
Graph starts at the energy level of the reactants and finishes with
the energy level of the products
Difference between the enegry or the reactans and products Overal energy change
Can be found by looking at the different in height on the graph
Reactants have more enegry than the products
In an exothermic reaction...
Energy is released
Reaction profile starts high and finishes lower than where it started
Products have more enegry than the reactants Enothermic or Exothermic
Energy is taken in during the reaction
In an endothermic reaction...
Reaction profile starts low and finishes higher than where it started
The minimum amount of energy the reactant particles need when
they collide in order to react
If the input energy is less than the activation energy there won't
be enough energy to start the reactions, nothing will happen
Activation energy (Ea)
You can find the Ea from its reaction profile by looking at the
difference between where the curve starts and the highest point
You can measure temperature change when dissolving salts by
adding the salt to a polestyrene cup of water and measuring the
change in temperature Dissolving salts in water
Dissolving ammonium chlordie is endothermic
reactions progresses Basics
Graph starts at the energy level of the reactants and finishes with
the energy level of the products
Difference between the enegry or the reactans and products Overal energy change
Can be found by looking at the different in height on the graph
Reactants have more enegry than the products
In an exothermic reaction...
Energy is released
Reaction profile starts high and finishes lower than where it started
Products have more enegry than the reactants Enothermic or Exothermic
Energy is taken in during the reaction
In an endothermic reaction...
Reaction profile starts low and finishes higher than where it started
The minimum amount of energy the reactant particles need when
they collide in order to react
If the input energy is less than the activation energy there won't
be enough energy to start the reactions, nothing will happen
Activation energy (Ea)
You can find the Ea from its reaction profile by looking at the
difference between where the curve starts and the highest point
You can measure temperature change when dissolving salts by
adding the salt to a polestyrene cup of water and measuring the
change in temperature Dissolving salts in water
Dissolving ammonium chlordie is endothermic
