After completing an experiment, all chemical wastes should be:

• A. left on the laboratory bench for the next class
• B. poured down the sink with plenty of water
• C. returned to their original containers for future use
• D. disposed of according to your instructor's or laboratory's safety guidelines

Answer: (D)

Verified step by step guidance

1. Understand that chemical waste disposal is a critical safety practice in any laboratory setting to prevent contamination, accidents, and environmental harm.
2. Recognize that leaving chemical wastes on the laboratory bench can cause contamination and hazards for others.
3. Know that pouring chemicals down the sink is generally unsafe unless specifically allowed, as it can harm plumbing and the environment.
4. Avoid returning used chemicals to their original containers to prevent contamination and dangerous reactions.
5. Always follow your instructor's or laboratory's specific safety guidelines for disposing of chemical wastes, as these protocols are designed to ensure safety and compliance with regulations.