Question

why are transition states associated with such high energies? they are held together by very firm, difficult - to - break bonds between reactants and products. they are held together by very unstable bonding between reactants and products. they are generally large molecules built of multiple reactants. the energy of all chemical reactions must increase to move from lower energy reactants to higher energy products.

Explanation:

Transition states have high energy because they involve unstable bonding between reactants as they transform into products. Unstable bonds require more energy to maintain.

Answer:

They are held together by very unstable bonding between reactants and products.