Question

When conducting tests for the presence of a specific organic substance, it is very useful to include a ________ control, which will always turn the expected color.

Answer 1

Experiment control is very useful.

What are chemical changes?

A chemical change is defined as a change in which a difference in chemical composition takes place. A new substance is included in these reactions.  Chemical reactions are usually indicated by a change in colour, heat modification, precipitate formation and evolution of bubbles.

Example: Oxidation of magnesium

Thus, this could be the answer.

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