Which of the following is a chemical property of a substance?

• A. Density
• B. Ability to react with oxygen
• C. Melting point
• D. Color

Answer: (B)

Verified step by step guidance

1. Understand the difference between physical and chemical properties: Physical properties can be observed or measured without changing the substance's identity, while chemical properties describe a substance's ability to undergo chemical changes.
2. Review each option and classify it as physical or chemical: Density, melting point, and color are physical properties because they describe measurable characteristics without changing the substance itself.
3. Identify the chemical property: The 'ability to react with oxygen' involves a chemical change where the substance forms new products (e.g., oxidation), so it is a chemical property.
4. Conclude that the correct answer is the property that involves a chemical reaction, which is the 'ability to react with oxygen.'
5. Remember that chemical properties are always related to how a substance interacts or transforms chemically, unlike physical properties that describe observable traits.