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Answer 1

Answer:

1) The prefix poly- means many, so a polyatomic ion is an ion that contains more than one atom

ex:m. For example, nitrate ion, NO3-, contains one nitrogen atom and three oxygen atoms

2)A mole of a substance or a mole of particles is defined as exactly 6.02214076×1023 particles, which may be atoms, molecules, ions, or electrons.

3)The law of constant proportions states that chemical compounds are made up of elements that are present in a fixed ratio by mass.

4)Molecules are made up of two or more elements. for example, the oxygen molecule (O2).

Compounds are made up of two or more DIFFERENT elements. In determining if you have molecules or compounds remember that a compound is also a molecule Water, carbon dioxide and table salt are some examples of compounds.

Explanation:

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