When should a lab coat, safety goggles, and gloves be worn in the laboratory? always, no exceptions always, unless the teacher instructs otherwise only when the teacher says to wear them never in chemistry labs

Always

Explanation:

A lab coat, safety goggles and gloves should always be worn inside a laboratory. This for the safety. There so many instruments, chemical filled bottles present in a laboratory. To avoid damage/ harm due to accidental spill or breakage, it is advised to take safety measures and wear a ab coat, safety goggles and gloves. Lab coat would protect any spill on the clothes and bare skin. Goggles would protect any spill in the eyes or fumes which could cause irritation in eyes. Gloves would protect the hands. Hence, these should be always wore to the laboratory.

conservation of mass

mass before something happens = mass afterwards