A change that alters a substance into new substances?

• A. Physical Change
• B. State Change
• C. Phase Change
• D. Chemical Change

Answer: (D)

When a change creates new substances, the identity of the material is altered because its chemical composition has changed. This happens when bonds break and new bonds form, yielding substances with different properties from the starting material. You often see signs like color changes, formation of a precipitate, gas bubbles, or an temperature change—evidence that new substances with new chemical identities have formed.

In contrast, changes in physical form or state—such as melting, freezing, or boiling—only affect how a substance exists (solid, liquid, gas) or its appearance, not its chemical makeup. Dissolving, tearing, or bending a substance are also physical changes; they don’t produce new substances.

So the scenario described—altering a substance into new substances—points to a chemical change.