Final answer:
The required personal protective equipment for every chemistry lab session is goggles, providing essential eye protection against chemical splashes, debris, or laboratory accidents.
Step-by-step explanation:
The piece of personal protective equipment that is required for every lab session in a chemistry lab is D. Goggles. The primary reason for this requirement is to protect the eyes from potential chemical splashes, debris, or any unforeseen accidents that may occur during experiments. Goggles are mentioned specifically in safety guidelines as a must-have item when working with fire, sharp objects, dangerous chemicals, and heat within a laboratory setting.