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ANSWER:

(D) Carbon dioxide

EXPLANATION:

A pure can be not be broken down into its constituents by physical means. A pure substance is made up of the same kind of atom or atoms. Carbon dioxide is a pure substance and cannot be broken into its constituents by physical means.

Answer;

-Carbon dioxide

Explanation;

  • A pure substance is a substance that contains only one type of atoms or molecules, therefore elements and compounds are examples of pure substances.
  • Carbon dioxide is a pure substance since it consists of molecules of carbon dioxide.
  • Salt water is a not a pure substance but a mixture of water and a salt. Gasoline is also not a pure substance but a mixture of various compounds. Soda is also a mixture and not a pure substance as it contains several components such as water, sugar, etc.

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