Which of the following should be the first thing you do upon entering a chemistry laboratory?

• A. Dispose of any leftover chemicals from previous experiments.
• B. Turn on all laboratory equipment.
• C. Begin mixing chemicals for your experiment.
• D. Read and understand all safety instructions and procedures.

Answer: (D)

Verified step by step guidance

1. Recognize that safety is the top priority when entering a chemistry laboratory to prevent accidents and ensure a safe working environment.
2. Understand that the first action should be to read and comprehend all safety instructions and procedures posted or provided for the laboratory session.
3. Know that disposing of leftover chemicals or turning on equipment before understanding safety protocols can be dangerous and is not recommended.
4. Realize that beginning any experimental work, such as mixing chemicals, should only be done after fully understanding the safety guidelines and proper procedures.
5. Therefore, always start by familiarizing yourself with the safety rules to protect yourself and others before handling any chemicals or equipment.