Final answer:
It is crucial to never leave a lit burner unattended to ensure laboratory safety.
Explanation:
Never leave a lit burner unattended is a critical safety rule when using Bunsen burners in a laboratory setting. Leaving a burner unattended can lead to accidents, fires, or even explosions due to the open flame. It is essential to always turn off the Bunsen burner when not in use to prevent any potential hazards.
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