Chemical Formulas

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What is a chemical formula?

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A chemical formula is a way of expressing the composition of a substance using symbols for its constituent elements and numbers to indicate the quantity of each element.

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NGSS.MS-PS1-1

Front

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.

Front

What is the chemical formula for water?

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H₂O

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NGSS.MS-PS1-1

Front

How many hydrogen atoms are in one molecule of water (H₂O)?

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2

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NGSS.MS-PS1-1

Front

What is the difference between an element and a compound?

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An element is a pure substance that cannot be broken down into simpler substances, while a compound is a substance formed when two or more elements chemically bond together.

Front

What is the chemical formula for carbon dioxide?

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CO₂

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NGSS.MS-PS1-1

Front

How many total atoms are in a molecule of carbon dioxide (CO₂)?

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3 (1 carbon atom and 2 oxygen atoms).

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NGSS.MS-PS1-1

Front

What is the chemical formula for alanine?

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C₃H₇NO₂

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NGSS.HS-LS1-6

Front

How many total atoms are in a molecule of alanine (C₃H₇NO₂)?

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13 (3 carbon, 7 hydrogen, 1 nitrogen, and 2 oxygen atoms).

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NGSS.MS-PS1-1

Front

What is the chemical formula for aluminum oxide?

Back

Al₂O₃

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NGSS.MS-PS1-1