Which statement about physical properties is true?

Which statement about physical properties is true?

• A. They describe how a substance changes to form new substances.
• B. They involve a chemical reaction.
• C. They require destruction of the substance to observe.
• D. They can be observed without changing the identity of the substance.

Answer: (D)

Physical properties are features you can observe or measure without changing the substance’s chemical identity. You can notice color, density, melting point, boiling point, hardness, and conductivity while the substance remains the same compound. The other ideas involve chemical changes or destroying the sample to observe, which would alter what the substance actually is. Therefore, the statement that these properties can be observed without changing the identity of the substance is true.

Physical properties are features you can observe or measure without changing the substance’s chemical identity. You can notice color, density, melting point, boiling point, hardness, and conductivity while the substance remains the same compound. The other ideas involve chemical changes or destroying the sample to observe, which would alter what the substance actually is. Therefore, the statement that these properties can be observed without changing the identity of the substance is true.