Question

select all the true statements about general lab rules.
do not touch equipment, chemicals or materials until instructed to do so
do not work alone in the lab
eating, drinking or chewing gum is allowed if there is no one in the lab
keep aisles and counters clear of unnecessary materials

Explanation:

• "Do not touch equipment, chemicals or materials until instructed to do so": Correct. In a lab, unauthorized handling can be dangerous.
• "Do not work alone in the lab": Correct. Working alone lacks assistance in case of emergencies.
• "Eating, drinking or chewing gum is allowed if there is no one in the lab": Incorrect. Lab rules generally prohibit food and drink regardless of presence of others due to contamination risks.
• "Keep aisles and counters clear of unnecessary materials": Correct. Clear spaces ensure safety and proper workflow.

Answer:

• Do not touch equipment, chemicals or materials until instructed to do so
• Do not work alone in the lab
• Keep aisles and counters clear of unnecessary materials