Which of the following is NOT an indication of a chemical change?

• A. Production of a gas
• B. Change in state from solid to liquid
• C. Formation of a precipitate
• D. Change in color

Answer: (B)

Verified step by step guidance

1. Understand that a chemical change involves the formation of new substances with different chemical properties, while a physical change affects only the state or appearance without altering the chemical identity.
2. Identify the options given: production of a gas, change in state from solid to liquid, formation of a precipitate, and change in color.
3. Recognize that production of a gas, formation of a precipitate, and change in color are all typical signs of chemical changes because they indicate new substances or chemical reactions occurring.
4. Note that a change in state from solid to liquid (melting) is a physical change because it only changes the physical form of the substance without creating a new substance.
5. Conclude that the option 'change in state from solid to liquid' is NOT an indication of a chemical change.