23 which term is defined as the difference between the potential energy of the products and the potential energy of the reactants in a chemical reaction? (1) activation energy (3) heat of fusion
(2) thermal energy (4) heat of reaction

(4) heat of reaction

Explanation:

1) Activation energy is defined as the extra energy required by the reactants to cross the energy barrier in order to get converted to products.

2) Heat of fusion is the the heat required to convert 1 mole of the solid into liquid state at constant pressure.

3) Thermal energy is the energy possessed by an object by virtue of its temperature.

4) Heat of reaction is defined as the difference between the potential energy of the products and the potential energy of the reactants in a chemical reaction.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

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