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9 April, 02:43

Which of the following represent elements and which represent compounds?

A. HC1

B. CO

C. Na

D. Ca

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Answers (1)
  1. 9 April, 02:58
    0
    A and B are compounds

    C and D are elements

    In Chemistry, an element is shown by a single uppercase letter, sometimes followed by a lowercase letter.

    In this case, Na is Sodium, and Ca is Calcium.

    A and B have two uppercase letters, indicating that they are not an element, but a combination of elements, therefore, they are compounds (Hydrogen Chloride, and Carbon monoxide)
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