Which of the following occurs during a chemical change?

• A. No energy is absorbed or released.
• B. The change is always easily reversible.
• C. The chemical composition of the substance remains unchanged.
• D. A new substance is formed with different chemical properties.

Answer: (D)

Verified step by step guidance

1. Understand that a chemical change involves the transformation of substances into new substances with different chemical properties.
2. Recall that during a chemical change, bonds between atoms are broken and new bonds are formed, resulting in a change in chemical composition.
3. Recognize that energy is often absorbed or released during chemical changes, so the statement 'No energy is absorbed or released' is generally false.
4. Note that chemical changes are usually not easily reversible because the original substances have been transformed into new substances.
5. Conclude that the defining feature of a chemical change is the formation of a new substance with different chemical properties, distinguishing it from physical changes.