When two substances undergo a chemical change upon being combined, what is the general outcome?

• A. A new substance with different chemical properties is formed.
• B. Only a physical change, such as a change in state, occurs.
• C. Energy is always absorbed and no new substance is produced.
• D. The original substances remain unchanged.

Answer: (A)

Verified step by step guidance

1. Understand that a chemical change involves the rearrangement of atoms to form new substances with different chemical properties.
2. Recognize that when two substances undergo a chemical change upon being combined, the original substances react to form one or more new substances.
3. Note that this process is different from a physical change, where only the state or appearance changes but the chemical identity remains the same.
4. Recall that energy may be absorbed or released during a chemical change, but the key indicator is the formation of new substances, not just energy changes.
5. Conclude that the general outcome of a chemical change is the formation of a new substance with different chemical properties from the original substances.