<|system|>
Complete the sentence.
Silver jewelry tarnishing is a ().
A: physical change
B: chemical change</s>.
<|user|>
Can you answer based on context?
<|assistant|>
Metal turning less shiny over time is called tarnishing. Silver jewelry tarnishing is a chemical change. The silver reacts with sulfur in the air to form black tarnish. The tarnish is a different type of matter that was not there before the change.