Silver sulfide (Ag2S) is the sulfide of silver. This dense black solid constitutes the tarnish that forms over time on silverware and other silver objects. Silver sulfide is insoluble in all solvents, but is degraded by strong acids. Silver sulfide features a covalent bond, as it is made up of silver (electronegativity of 1.98) and sulfur (electronegativity of 2.58). It is a component of classical qualitative inorganic analysis. When formed on electrical contacts operating in an atmosphere rich in hydrogen sulfide, long filaments known as silver whiskers can form.
Read more about Silver Sulfide: Structure
Famous quotes containing the word silver:
““Maman”, said Annaïse, her voice strangely weak. “Here is the water.”
A thin blade of silver came forward in the plain and the peasants ran alongside it, crying and singing.
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“Oh, Manuel, Manuel, why are you dead?” moaned Délira.
“No”, said Annaïse, and she smiled through her tears, “no, he is not dead”.
She took the old woman’s hand and pressed gently against her belly where new life stirred.”
—Jacques Roumain (1907–1945)