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You asked:

is calcium carbonate a compound or a mixture

  • Calcium carbonate is a chemical compound.
  • mixture
    mixture
    calcium carbonate
    calcium carbonate
    chemical compound

    chemical compound (a substance consisting of two or more different elements chemically bonded together in a fixed proportion by mass)

  • chemical compound

    chemical compound (a substance consisting of two or more different elements chemically bonded together in a fixed proportion by mass)