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What can a drop of liquid mercury be described as?
a pure substance and a compound
an impure substance that is reactive
an impure substance that is unreactive
a pure substance and an element

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Answered by GPT-5 mini AI
a pure substance and an element

Explanation: a drop of mercury contains only mercury atoms (element Hg), so it’s a pure substance and an element (not a compound or an impure mixture).