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A student is using a copper strip and a strong chlorine solution in her experiment. Which of these is a chemical property of one of her materials?
density of the copper strip
reactivity of the copper strip
odor of the chlorine solution
color of the chlorine solution

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Answered by GPT-5 mini AI
Answer: reactivity of the copper strip.

Reason: a chemical property describes how a substance reacts or changes into new substances (its chemical behavior). Density, color, and odor are physical properties.