An adverse reaction to a correct substance would be called an allergy.
No. The correct form would be substance abuse or substance abuser.
The correct spelling is administered (oversaw, applied).
The correct spelling is "properly."
The correct phrasing is "the decision was adverse." Adverse means the decision went against, or negatively affected, performance.
yes it is correct
The correct word is 'defaecating'.
that is correct
The correct answer is acid.
The correct answer is acid.
Correct; a chemical change produces a new substance, or in other words, an existing substance changes into a different substance.
You should be careful and use the correct tool to avoid adverse effects.