Chemical Formulas

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What is a chemical formula?

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A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using symbols for the elements and numbers to indicate the quantity of each element.

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What does the subscript in a chemical formula indicate?

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The subscript in a chemical formula indicates the number of atoms of the element that are present in one molecule of the compound.

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How many atoms of chlorine are in MgCl₂?

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2

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How many atoms of aluminum are in Al₂O₃?

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2

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How many hydrogen atoms are in a molecule of H₂O?

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2

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How many atoms of sulfur are in each molecule of H₂SO₄?

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1

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How many oxygen atoms are in a molecule of CO₂?

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2

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Front

What is the chemical formula for water?

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H₂O

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What is the chemical formula for carbon dioxide?

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CO₂

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What does the formula Al₂O₃ represent?

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Aluminum oxide, which contains 2 aluminum atoms and 3 oxygen atoms.

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