Which statement is true of a chemical change?

• A. A chemical change only alters the physical state of a substance without changing its composition.
• B. A chemical change results in the formation of new substances with different chemical properties.
• C. A chemical change is always reversible by simple physical means.
• D. A chemical change does not involve the breaking or forming of chemical bonds.

Answer: (B)

Verified step by step guidance

1. Understand the definition of a chemical change: it involves a process where substances are transformed into new substances with different chemical compositions and properties.
2. Recognize that a chemical change typically involves breaking and forming chemical bonds, which leads to the creation of new substances.
3. Distinguish chemical changes from physical changes: physical changes only affect the physical state or appearance of a substance without altering its chemical identity.
4. Note that chemical changes are often not easily reversible by simple physical means, unlike many physical changes.
5. Conclude that the true statement about chemical changes is that they result in the formation of new substances with different chemical properties.