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

It's d
It can't be A because energy can't be created or destroyed.
It cant be C because energy doesn't take enough of a role in the light of the fire.
It can't be B because the compounds are not changing.

Answer 2

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

Step-by-step explanation:

When a log of wood burns, Oxygen must be present because it is a combustion reaction. A log of wood is composed of organic materials and the main organic material present is Carbon.

Due to the fact that Oxygen is present, Carbon reacts with Oxygen to form Carbon dioxide which contains lesser energy than Carbon.