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Activation energy is the amount of energy needed before a reaction could proceed. There is a numerical value and it's important because a larger activation energy tends to have a slower reaction. Also this is important when it comes to enzymes
Graphically, activation energy is the hump in between the reactants and products that must be overcome in order for the reaction to proceed. Both exo and endo reactions have an activation energy, and catalysts help to minimize this activation energy. It is a numerical value, yes.
A reaction needs to reach the activation energy in order for the reactants to convert to products. You can calculate it numerically with the Arrhenius equation (which shows that it depends on the rate constant k and the temperature of the reaction).
The activation energy is how much energy the reaction requires to proceed and this is for both endergonic and exergonic reactions. When there is not enough energy to overcome this barrier, the reaction will not proceed.
The activation energy is the amount of energy that is required initially for a reaction to occur. This value is important because it determines how likely a reaction is to occur, and therefore, how long it will take to occur.
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