Chemistry, 17.08.2021 01:00 jdvazquez18p7a7vs

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.

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Answer from: ijohnh14

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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Answer from: bob4059

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

yeah its just the right answer

Answer from: Quest

Cr(oh)3 -> cr(3+) + 3oh-

Answer from: Quest

definition

entropy is a measure of the randomness or the extent of disorder of a chemical process.

enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

entropy is measured in joule per kelvin (jk⁻¹) whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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A student in a lab holds an iron nail over an open flame, and no reaction occurs. The nail is then f...

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