The is what needs to be overcome in a reaction so that it can proceed to the products.

The answer to this question would be: activation energy

Activation energy is the energy needed for the chemical reaction to occur. The energy can be written as KJ/mol or kkcal/mol. This activation energy can be lowered by adding a catalyst which in turn increases the reaction rate

7is b8 is d9 is c10 is a11 is d