Question
11. The table below shows the properties of calcium metal. Appearance & Silvery white Melting Point & 842^circ mathrm(C) Reactivity & Reacts moderately with cold water and vigorously with acids Density & 1.55 mathrm(~g) / mathrm(cm)^3 Which statement characterizes the properties of calcium based on the table? A The appearance of calcium is a physical property because its color depends on chemical changes. B. The melting point of calcium is a physical property because measuring it produces a chemica reaction. C. The reactivity of calcium is a chemical property because it involves a change in the chemical composition. D. The density of calcium is a chemical property because changing the density involves making calcium into another element.
Answer
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Tegwen
Expert · Tutor for 3 years
Answer
C. The reactivity of calcium is a chemical property because it involves a change in the chemical composition.
Explanation
To characterize the properties of calcium based on the given table, we need to distinguish between physical and chemical properties. Physical properties can be observed or measured without changing the substance's chemical identity, such as appearance, melting point, and density. Chemical properties involve the substance's ability to undergo chemical changes, such as reactivity.- Option A is incorrect because the appearance (color) of calcium is a physical property and does not depend on chemical changes.- Option B is incorrect because the melting point is a physical property, and measuring it does not produce a chemical reaction.- Option C is correct because reactivity involves a change in the chemical composition of calcium, indicating a chemical property.- Option D is incorrect because density is a physical property and does not involve changing calcium into another element.