substance a is added to substance b to form a mixture. which substance's chemical properties will change?

When substance A is added to substance B to form a mixture, the chemical properties of neither substance typically change. In a mixture, the substances retain their individual chemical properties because no chemical reaction occurs between them; they are simply physically combined. Therefore, both substances maintain their original chemical properties. Chemical properties describe a substance's ability to undergo chemical changes and form new substances, and such changes only happen if a chemical reaction takes place. Since mixtures do not involve chemical reactions, the chemical properties of substance A and substance B remain unchanged in the mixture.