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15 February, 02:32

How do scientists distinguish between an element and a compound? List two elements and two compounds.

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Answers (2)
  1. 15 February, 02:45
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    Element and compound, and or heterogeneous and homogeneous
  2. 15 February, 04:25
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    A compound is a substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule. The elements can not be separated by physical means. Water, for example, is a compound having two hydrogen atoms and one oxygen atom per molecule. An element is a substance consisting of atoms which all have the same number of protons - i. e the same atomic number. Elements can not be broken down using chemical methods.

    Elements:

    1. Magnesium (Mg)

    2. Calcium (Ca)

    Compounds:

    1. Sodium chloride (NaCl)

    2. Hydrogen chloride (HCl)
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