An Element is a pure substance.
Description: The standard enthalpy of reaction is the enthalpy change that occurs in a system when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states.
Answer:
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Answer:
They are made in the Heavens, in Stars.
Explanation:
It would be that Electrical energy is converted to chemical energy only when there is an external power source because there are both kinds of cells that are electrochemical to which an arode is an electrode to which there is half-reaction on the oxidation and another half-reaction on the reduction but only for the electrode cathode. The main cell that converts chemical energy into electrical energy is a called the Galvanic energy.