Question

look at the picture showing a piece of wood burning in a fire. which option best indicates that a chemical reaction is occurring? the wood is just melting into a liquid. the wood is changing into new substances like ash, heat, and smoke. the wood stays the same but changes shape. the wood is freezing.

Explanation:

A chemical reaction involves the transformation of substances into new substances. Melting (a physical change where a solid becomes a liquid), changing shape (a physical change), and freezing (a physical change where a liquid becomes a solid) do not involve the formation of new substances. When wood burns and changes into ash, heat, and smoke, new substances are formed, which is a key characteristic of a chemical reaction.

Answer:

The wood is changing into new substances like ash, heat, and smoke.