What is a change that occurs when one or more substances change into entirely new substances with different properties?

• A. Physical Change
• B. Ionic Compound
• C. Chemical Change
• D. Physical Property

Answer: (C)

When substances become entirely new substances with properties that are different from the starting materials, that is a chemical change. In a chemical change, bonds are broken and new bonds form, producing products with different chemical formulas and distinct properties. You might observe a color change, changes in odor, gas formation, a precipitate, or energy being released or absorbed. This contrasts with a physical change, where the substance may alter its appearance, shape, or state but keeps the same identity and composition, like ice melting into water or sugar dissolving in water. The idea here is that new substances with different properties are created, which is the hallmark of a chemical change.