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": This is a safety rule to prevent accidents like chemical spills or improper use of equipment.
• "Do not work alone in the lab": In case of an accident (e.g., chemical splash, equipment malfunction), having someone else around can help with immediate assistance.
• "Eating, drinking or chewing gum is allowed if there is no one in the lab": This is false. Even if alone, there could be chemical vapors or residues that can contaminate food/drink.
• "Keep aisles and counters clear of unnecessary materials": Clear aisles prevent tripping hazards, and clear counters make it easier to work and access necessary items.

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