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Is tarnishing considered a physical or chemical change?

Answer 1

#"Tarnishing"# is properly considered a chemical change.

Chemical change is characterized by the formation of new substances, and the making and breaking of chemical bonds. When a metal tarnishes, typically copper, brass, silver, aluminum, or magnesium, it reacts with atmospheric oxygen to form a thin oxide coating. When iron tarnishes, we call the phenomenon #"rusting"#. Some metals, particularly gold, are very resistant to tarnishing, and this is one of the reasons why gold is so valued as an ornamental metal.

After that, you'll need to instruct your butler to use a metal cleaner, which is typically abrasive, to polish the silverware.

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Answer 2

Mateo Aguilar

It is believed that tarnishing is a chemical change.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.