A student makes several observations about a piece of iron
Subject : Chemistry
Question: A student makes several observations about a piece of iron. Which observation describes a chemical property of the iron?
A. Its mass is 52 grams.
B. Its density is 7.9 grams/centimeter3.
C. It rusts when exposed to air.
D. It conducts electricity.
Expert Verified Solution:
The correct answer is:
C. It rusts when exposed to air.
Explanation:
A chemical property describes a substance’s ability to undergo a specific chemical change. When iron rusts upon exposure to air, it reacts with oxygen and moisture to form iron oxide, a new substance. This is a chemical change, indicating a chemical property of iron.
In contrast:
A. Its mass is 52 grams and B. Its density is 7.9 grams/centimeter³ are physical properties because they describe measurable characteristics of the iron that do not involve a chemical change.
D. It conducts electricity is also a physical property because it describes a characteristic (electrical conductivity) that does not involve a change in the chemical composition of the iron.
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