Respuesta :
Based on this observation the unknown compound is a pure substance. The correct option is D.
What is a pure substance?
Pure substances are those that contain only one type of particle and have a fixed or consistent structure. Elements and compounds are subcategories of pure substances.
A chemist is studying an unknown element and can only break it down into its elemental components through chemical means. Based on this observation, the unknown substance is classified as pure.
Thus, the correct option is D.
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