Question

when wood is burned, which of the following indicates that a chemical change has occurred? decrease in temperature change in color formation of a precipitate

Explanation:

A chemical change results in the formation of new substances. When wood burns, it undergoes a chemical reaction with oxygen. A change in color is a sign of a chemical change as new substances are formed during combustion. A decrease in temperature is not characteristic of a burning - wood chemical change as burning is an exothermic process. Formation of a precipitate occurs in aqueous chemical reactions, not in the burning of wood.

Answer:

change in color