Which of the following represents a chemical change?

Name: Which of the following represents a chemical change?
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Question

Quizplus · Accepted Answer

Steel turning to rust in salt air represents a chemical change because iron in the steel reacts with oxygen and water in the air to form iron oxide (rust), which is a different substance than the original steel. The other choices represent physical changes, where the state or appearance of the substance changes, but the chemical identity of the substance remains the same.

Which of the Following Represents a Chemical Change