How did the experiement with the iron filings and sulfur compare with the experiment in which copper(II) sulfate pentahydrate was heated?

Both resulted in gas formation.

Both resulted in color change.

Both involved chemical change.

Both involved physical change.

One involved chemical change while the other involved physical change.

How did the experiement with boiling water compare with the experiment in which magnesium was added to hydrochloric acid?

Both resulted in gas formation.

Both resulted in temperature change.

Both involved chemical change.

Both involved physical change.

One involved chemical change while the other involved physical change.

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