Question

which statement describes a chemical property of an element?
a potassium has a density of 0.89 g/cm3 at room temperature.
b aluminum melts at 933 k.
c silver reacts with hydrogen sulfide.
d copper is reddish in color.

Explanation:

To determine the chemical property, we recall that chemical properties involve a substance's ability to undergo chemical reactions (change into new substances). Physical properties (like density, melting point, color) can be observed without changing the substance's chemical identity.

• Option A: Density is a physical property (no chemical change).
• Option B: Melting point is a physical property (phase change, no new substance).
• Option C: Silver reacting with hydrogen sulfide involves a chemical reaction (new substance forms, e.g., silver sulfide), so this is a chemical property.
• Option D: Color is a physical property.

Answer:

C. Silver reacts with hydrogen sulfide.