Question

two chemicals react in an endothermic reaction. what can be known about this reaction? heat is absorbed because the old substance needs more energy to break its bonds. heat is released because the old substance needs less energy to break its bonds. a precipitate will form as a result of the reaction. a gas will form as a result of the reaction.

Explanation:

In an endothermic reaction, heat is absorbed. This is because more energy is required to break the bonds of the reactants than is released when new - bonds are formed.

Answer:

Heat is absorbed because the old substance needs more energy to break its bonds.