Question

when used as recommended, chemicals are: left in storage; hazardous; safe and effective. question 16 safety is... c. essential; d. for my own good; a. boring; b. a time to nap

Explanation:

Chemicals used as recommended are generally safe and effective. Safety is an essential concept as it pertains to well - being and protection from harm.

Answer:

For the first question: Safe and effective
For the second question: C. Essential