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. 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.

B. 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.

C. 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.

D. 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.

The following statement accurately identifies one of the changes that occurs as a physical or chemical change;  "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."

The most important aspect of chemical change is that  the composition of a substance changes when the substance undergoes a chemical change. This is not the case when the substance undergoes a physical change.

After a physical change, the form, size or appearance may change but never in composition.

Hence the appropriate answer is;  "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."

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A - 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.

Explanation

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answer

i think the answer is a) as air pressure in an area increases, the density of the gas particles in that area decreases.

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