The activated complex lies at the top of the energy curve. It is the highest energy complex in the overall reaction scheme, synonymous to the transition state.
If you look at the reaction:
A + B --> C + D
The activated complex is right in the middle of the arrow. For A + B to become C + D, we need some energy. Because you're forcing two atoms close together, bonds are being formed and broken. The activated complex is where those bonds are all half broken and formed.
To get a better feel for this, do a search for reaction coordinates. You'll see an energy curve for the reaction which will show a large bump in energy. At the very top of that bump is the activated complex.
As a side note, it can come as a bit of a shock when people start talking about activated complexes\transition states. Because often in chemistry you'll spend years just sort of assuming these things are clean and instant...which actually goes against our common sense. Just trust your instincts here, everything takes time...even if it is only a tiny fraction of a second.
Find a reaction and try to picture what the activated complex would be, you would likely be surprised how correct you are for many of them. If you are doing a chemistry degree, you should have a course or two specifically about these.
For further searching try:
activated complex, transition state, transition stage, reaction intermediate, reaction coordinate.
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.
The amount of energy needed to move an electron from one energy level to another is known as the energy difference between the two levels. This energy difference is typically quantified in electron volts (eV) or joules.
The amount of energy needed for a reaction to take place is called the activation energy. It is the minimum amount of energy required for the reactants to transform into products. This energy is needed to break bonds in the reactant molecules before new bonds can be formed.
The energy needed for ionization is called ionization energy. It is the minimum amount of energy required to remove an electron from an atom or molecule in its gaseous state.
For the substance(s) to react
enzymes
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.
Activation energy
The amount of energy needed to move an electron from one energy level to another is known as the energy difference between the two levels. This energy difference is typically quantified in electron volts (eV) or joules.
It lowers the amount of activation energy needed
The equation to calculate the amount of energy needed to change state is: Q = m * L, where Q is the energy needed, m is the mass of the substance, and L is the specific latent heat of the substance.
The activation energy.
Using catalysts the activation energy is lowered.
The amount of energy needed to start a chemical reaction is known as the activation energy. This energy is required to break the existing bonds in the reactants before new bonds can be formed in the products.
energy sprawl is the amount of land needed to produce clean energy
The amount of energy necessary to cause a chemical reaction to occur is called activation energy.
The amount of energy needed for a reaction to take place is called the activation energy. It is the minimum amount of energy required for the reactants to transform into products. This energy is needed to break bonds in the reactant molecules before new bonds can be formed.