The question is this "what is an energy barrier?"
My answer: First of all, activation energy is energy that is needed to start a reaction and barrier means to block so then energy barrier means to block energy.
This energy is called "energy of activation", it is used to overcame the energy barrier between reactants and products.
activation energy
You have to have data in order to find Ea.
The activation energy is the amount of energy needed to start a reaction. If the reactants have less than that amount the reaction will not occur. In this way it acts as a barrier that prevents a reaction unless there is enough energy to break it.
No, the opposite. The lower the activation barrier the faster the reaction goes. That is how a catalyst speeds up the reaction: by lowering the activation energy.See the Web Links for more information.
The Activation Energy.
needed energy
This energy is called "energy of activation", it is used to overcame the energy barrier between reactants and products.
activation energy
You have to have data in order to find Ea.
The activation energy is the amount of energy needed to start a reaction. If the reactants have less than that amount the reaction will not occur. In this way it acts as a barrier that prevents a reaction unless there is enough energy to break it.
to prevent activation of the immune system of the male against the developing sperm
Activation energy
Energy is stored in the chemical bonds of organic molecules. The barrier of EA prevents these molecules from spontaneously breaking down and releasing that energy.
A reaction occurs when 2 particles collide with sufficient energy to overcome the activation barrier and then react.
The definition of the activation energy is exactly the same -- the thermodynamic energy barrier that the reactant must pass over to convert to products. The difference between a thermal and a photochemical reaction is only where the reactants get the energy to get over this barrier. In a thermal reaction, that energy is given by the temperature, and is carried in excited rotational modes, higher kinetic energies and if hot enough, excited vibrational states. In a photochemical reaction, the activation energy is provided by photons, usually in the form of electronic excited states, but could also be vibrational or rotational. The concept of the activation barrier is identical in both cases.
No, the opposite. The lower the activation barrier the faster the reaction goes. That is how a catalyst speeds up the reaction: by lowering the activation energy.See the Web Links for more information.