Question

Which is an accurate description of what occurs when a log burns?

A) Energy is created as the log burns
B) The compounds that make up the log are converted into fire, heat, and energy. C) As the log burns, the nuclear binding energy of the molecules in the log is released. The nuclear binding energy is transformed into the light and heat of the fire.
D) The molecules present in the log are transformed into molecules that contain less energy than the original molecules. The energy difference is the heat of the fire.

Answer 1

D is the answer.
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Answer 2

Answer: The molecules present in the log are transformed into molecules that contain less energy than the original molecules. The energy difference is the heat of the fire.

Explanation:-

An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding. The temperature of the surrounding decreases. In an endothermic reaction, the energy of the reactants is lower than the energy of the products. The difference in the energies of these two is the energy which was being absorbed for completion of reaction.

An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding. The temperature of the surrounding increases. In an exothermic reaction, the energy of the reactants is higher than the energy of the products. The difference in the energies of these two is the energy which was being released on completion of reaction.