What is an exothermic reaction and an endothermic reaction?

 An exothermic reaction is a chemical reaction that releases energy in the form of heat, light, or sound. The energy is transferred to the surroundings, resulting in an increase in temperature. An exothermic reaction can be represented as a negative change in enthalpy (ΔH < 0).

An endothermic reaction, on the other hand, is a chemical reaction that absorbs energy from the surroundings in the form of heat. This results in a decrease in temperature, and the reaction can be represented as a positive change in enthalpy (ΔH > 0).

In simple terms, exothermic reactions give off energy while endothermic reactions take in energy.

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How many elements of unsaturation does a molecule with the chemical formula C5H8 have?

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