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Which of the following is true about the relationship between energy and chemical reactions?

Activation energy is required for a chemical reaction to occur.
Activitation energy is not necessary in a chemical reaction which releases energy.
Chemical bonds are always broken by energy absorption in a chemical reaction.
Energy-absorbing reactions don't occur in chemical reactions.

  • biology - ,

    I know that Eact is needed to obtained first before a chemical rxn can occur... the nrg absorption parts, I don't know.

  • biology - ,

    the first statement is true.
    there are reactions which require energy for activation and reaction proceeds with the evolution of energy.
    chemical bonds MIGHT NOT be always broken by energy absorption. the amount of energy depends on the nature of reactants.
    moreover there are a horde of examples where energy absorbing reactions occur.


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