After the addition of the iron, the test tube now contains iron (II) sulfate solution and copper particles. The iron has become part of a
A
compound with the sulfate, which must be separated through chemical methods
B
compound with the sulfate, which can be separated through physical methods
C.
mixture with the sulfate, which must be separated through chemical methods
D. mixture with the sulfate, which can be separated through physical methods

The iron has become part of a A. compound with the sulfate, which must be separated through chemical methods.

Iron (II) sulfate is also referred to as ferrous sulfate is a reducing agent. The hydrates form is used for the treatment of iron deficiency.

It should be noted that a chemical change is involved in the formation of iron (II) sulfate. It can't be separated by physical means and isn't reversible.

In this case, iron (II) sulfate will be separated by chemical methods.

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Iron sulfate is a compound which can be separated through chemical methods.

Iron is present in a compound form with the sulfate, which must be separated through chemical methods because both iron and sulfate reacts with each other through making of chemical bonds with each other. Those elements that combine with each other chemically at a fix ratio can be separated from each other through chemical methods.

While on the other hand, in mixture substances combine with each other physically so they can be separated from each other through physical methods so we can conclude that iron sulfate is a compound which can be separated through chemical methods.

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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.