Question

multiple-choice question when do lab safety guidelines need to be discussed? (check all correct responses.) only as necessary before each lab at the beginning of the school year or semester whenever there is a question about lab safety rewatch

Explanation:

• "Only as necessary" is incorrect because lab safety should be proactive, not just reactive.
• "Before each lab" is correct as reviewing safety before each lab ensures awareness of specific risks for that session.
• "At the beginning of the school year or semester" is correct to establish a baseline of safety knowledge.
• "Whenever there is a question about lab safety" is correct to clarify doubts and ensure proper safety practices.

Answer:

B. Before each lab
C. At the beginning of the school year or semester
D. Whenever there is a question about lab safety