A student accidentally breaks a mercury thermometer in the laboratory. Which of the following is the most appropriate immediate action?
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Correct answer
B. Cover the spill with sulfur powder and then carefully collect the mercury.
Principle or equation
Mercury is toxic and volatile. It should be contained and treated with sulfur to form mercury(II) sulfide, reducing vapor release, then collected and disposed of properly.
Why this answer is correct
Sulfur reacts with mercury to form a non-volatile solid, making cleanup safer. Vacuuming can aerosolize mercury droplets; water does not dissolve mercury; delaying cleanup increases exposure risk.
Example
Sprinkle sulfur powder over the mercury droplets, then use a brush and dustpan to collect the amalgam into a labeled waste container.
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