Question

a chemical change happens when the molecules in a substance change to produce a new substance with a different chemical composition. signs that a substance has undergone a chemical change include: change in color change in odor production of bubbles (gas) formation of a precipitate (solid from a solution) increase in heat substance cannot be reversed which of the following is a sign of a chemical change? toast smells different than bread chocolate syrup dissolves in milk folding paper changes the size

Explanation:

• For "toast smells different than bread": A change in odor is a sign of a chemical change as new substances are formed during toasting (a chemical reaction occurs).
• For "chocolate syrup dissolves in milk": This is a physical change (dissolving) as no new substances are formed.
• For "folding paper changes the size": This is a physical change (change in shape/size) as no new substances are created.

Answer:

toast smells different than bread