A student conducts an experiment with a steel wool pad, which is comprised of iron. The student washes the steel wool in vinegar and then leaves the wool out in the open air for 15 minutes. The student notices that the wool is changing color (turning brownish-orange) and when the student touches the steel wool, it feels warm to the touch.
Which of the follow changes occured during this experiment?
A. A physical changed occured and energy was given off
B. A chemical change occured and energy was given off
C. A chemical change occured and energy was absorbed.
D. A physical change occured and energy was absorbed
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