Answered

Where does the energy come from which is needed for an endothermic reaction?

from the reactants
from the products
from the product / reactant solution
from the environment when no solution is involved
from the change in enthalpy

Answer :

Relligirl
The energy comes from C. from the environment when no solution is involved. 

Ans:

from the product / reactant solution

from the environment when no solution is involved

Endothermic reactions are those reactions that proceed with the absorption of heat energy. In this case, the enthalpy of the reactants i.e. the initial energy is lower than that of the products. Therefore, energy needs to be supplied in order to break the bonds in the reactants and allow the reaction to proceed. This energy can be absorbed either from the environment when no solution is involved or from the product reactant solution.

For example, electrolysis of water which produces H2 and O2 is an endothermic reaction. Here, energy is absorbed by water in the form of electricity (current) to split it into corresponding products.

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