A student in a lab holds an iron nail over an open flame, and no reaction occurs. The nail is then filed, creating small pieces of iron shavings. These pieces burn brightly when placed over an open flame. Which statement accurately identifies one of the changes that occurs as a physical or chemical change?

A. Burning the iron filings is a chemical change because the composition of the material does not change but the general appearance of the iron does change.
B. Burning the iron filings is a physical change because the composition of the material does not change but the general appearance of the iron does change.
C. Filing the nail is a chemical change because the composition of the material does not change but the general appearance of the iron does change.
D. Filing the nail is a physical change because the composition of the material does not change but the general appearance of the iron does change.

PLEASE HELP ITS URGENT 20 POINTS!!!!!!!!!!!!!!!!!!!!!!!

Small bits of iron shavings being formed are an example of a physical change because they can be transformed back into nails, whereas small pieces of iron shavings being burned on a flame are an example of a chemical change since they cannot be transformed back into their original shape. Chemical change is a change in matter that modifies the chemical properties of the substance as opposed to physical change, which modifies the matter's physical characteristics.

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