When should a lab coat, safety goggles, and gloves be worn in the laboratory? ?

I would say that you should wear a lab coat, safety goggles, and gloves when the teacher says so - not everything in a lab is dangerous, so there is no need to always wear these. But when the teacher says you should - then you should.

All the Time

Explanation:

You never know when something might happen, or when an experiment might involve dangerous compounds. Also, it is just proper lab protocol to always wear a coat. safety goggles, and gloves.

I'm always happy to help :)

Cr(oh)3 -> cr(3+) + 3oh-

Answer (b) supersaturation;