Burning a piece of wood in fire can be best described as a chemical change because the atoms in wood change their state. physical change because the atoms in wood are turned into a gaseous product. chemical change because the atoms in wood and oxygen are rearranged. physical change because the atoms in wood are turned into black ash.

chemical change because the atoms in wood and oxygen are rearranged.

Explanation: The chemical composition of wood varies from species to species, but is approximately 50% carbon, 42% oxygen, 6% hydrogen, 1% nitrogen, and 1% other elements.

When wood is being combusted in air(oxygen being the gas that rekindles the glowing splint), the chemicals are rearranged. Since about 50% of wood is carbon, C, the main chemical reaction going on here is C + O2 --> CO2. Of course, there are other chemical reactions too. But the formation of CO2 is the most common.

explanation:

since this is put under health, i would define "ethical (medical) behavior" the way the oath for doctors is recited.   "first do no harm."

but the term in general means when given a choice between right and wrong, we should always choose right. if we do, then we are practicing ethical behavior.