Question

generally in the formation of ..... substances energy is involved​

Answer 1

Answer:

Due to the absorption of energy when chemical bonds are broken, and the release of energy when chemical bonds are formed, chemical reactions almost always involve a change in energy between products and reactants. ... This stored chemical energy, or heat content, of the system is known as its enthalpy.

Explanation:

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Answer 2

Answer:

Describe the types of energy changes that can occur in chemical reactions

Explanation:

Chemical reactions often involve changes in energy due to the breaking and formation of bonds.

Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.

Exothermic reactions release heat and light into their surroundings. For example, combustion reactions are usually exothermic. In exothermic reactions, the products have less enthalpy than the reactants, and as a result, an exothermic reaction is said to have a negative enthalpy of reaction. This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products. Excess energy from the reaction is released as heat and light.