Sodium chloride is a compound, which is a pure substance formed from different elements that can only be separated by chemical means. The correct answer describes this characteristic accurately. Understanding compounds is crucial in distinguishing between substances in chemistry. ;
Sodium chloride is a pure substance formed from sodium and chlorine, which can only be separated into its elements through chemical means. Therefore, the correct option is D: a pure substance that can be separated into different elements by chemical means. Understanding this helps differentiate compounds from mixtures in chemistry.
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