Question

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

Explanation:

A chemical property is observed during a chemical reaction (involves substance change). Option A: Silver reacting with hydrogen sulfide is a chemical reaction (forms new substance), so it's a chemical property. Options B (density), C (color), D (melting point) are physical properties (no new substance formed).

Answer:

A. Silver reacts with hydrogen sulfide.