Which phrase most accurately describes a chemical change?

• A. A change that can be easily reversed by physical means
• B. A process that involves only the rearrangement of particles without forming new substances
• C. A change in the state of matter without altering the chemical composition
• D. A process in which new substances with different properties are formed

Answer: (D)

Verified step by step guidance

1. Understand that a chemical change involves the formation of new substances with properties different from the original substances.
2. Recognize that physical changes, such as changes in state or rearrangement of particles, do not produce new substances and are usually reversible.
3. Identify that the key characteristic of a chemical change is the breaking and forming of chemical bonds, leading to new chemical compositions.
4. Compare the given options and note that only the phrase mentioning the formation of new substances with different properties correctly describes a chemical change.
5. Conclude that the correct description of a chemical change is: 'A process in which new substances with different properties are formed.'