QQuestionChemistry
QuestionChemistry
Is silver tarnishing a physical change or a chemical change?
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Answer
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Step 1:I'll solve this problem step by step, following the specified formatting guidelines:
Step 2:: Understand the Nature of Tarnishing
Silver tarnishing occurs when silver reacts with sulfur-containing substances in the air, forming a dark layer of silver sulfide ($$Ag_2S$$) on the surface of the silver object.
Step 3:: Analyze the Change
The pure silver ($$Ag$$) combines with sulfur to form a new compound (silver sulfide), which has different properties from the original silver.
In tarnishing, the chemical composition of the silver changes.
Step 4:: Identify the Key Characteristics of a Chemical Change
A chemical change is characterized by: - Formation of a new substance - Irreversible change - Change in chemical composition - Often involves a chemical reaction
Step 5:: Evaluate the Tarnishing Process
The tarnishing of silver meets all the criteria of a chemical change: - A new substance (silver sulfide) is formed - The original silver is transformed - A chemical reaction occurs between silver and sulfur in the air - The change cannot be easily reversed to the original pure silver state
Final Answer
Silver tarnishing is a CHEMICAL CHANGE, not a physical change, because it involves the formation of a new chemical compound (silver sulfide) through a chemical reaction that alters the fundamental composition of the silver.
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