7
QuizMultiple Choice

Molar Masses — Unit test

Question 7 • LA-Chemistry A

Iron reacts with oxygen to form iron oxide (rust). Which best describes this statement?

Answer
A
Iron oxide is the liquid state of iron.
B
Iron oxide is the gaseous state of iron.
C
Iron oxide is formed by rearranging atoms.
D
Iron oxide is made up of only iron atoms.

Explanation

When iron reacts with oxygen, iron and oxygen atoms bond together in a new arrangement to form iron oxide. This is a chemical change, not a change of state, so iron oxide is neither liquid nor gaseous iron. It contains oxygen atoms as well as iron atoms, making C, “Iron oxide is formed by rearranging atoms,” the best description.

AI-written and checked against the verified answer.

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