Chemical Compounds

Chemical Compounds

By David Stanford

Chemical Compounds

The element names are represented by a single uppercase letter or an uppercase letter followed by a lowercase letter.

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Example: Ne (neon), C (carbon), Pb(lead)​

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Chemical Compounds

Subscripts are the numbers written on the lower right side of the element symbol, this tells you the number of atoms of that element.

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Example: O₂ (two atoms of oxygen)

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Chemical Compounds

If an element symbol has no subscript there is only one atom of that element in that molecule.

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Example: O₂ (two atoms of oxygen) O (one atom of oxygen)

H₂O (2 atoms hydrogen and 1 atom oxygen)​

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Chemical Compounds

Coefficients are found in front of the chemical formula, coefficients tell you that there are more than one of those molecules/compounds.

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Example: 2H₂O (there are 2 molecules of water (H₂O)

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Chemical Compounds

You need to multiply the coefficient by the the subscripts to determine the total number of atoms of each element in the molecule/compound.

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Example: 2H₂O (there are 4 atoms of hydrogen and 2 atoms of oxygen)

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Multiple Choice

How many atoms of hydrogen are in H₂O?

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• 2

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Multiple Choice

How many atoms of oxygen are in H₂O?

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Multiple Choice

How many molecules of water are present in 2H₂O?

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• 2

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• 4

Multiple Choice

How many atoms of hydrogen are in 2H₂O?

• 1

• 2

• 3

• 4

Multiple Choice

How many atoms of oxygen are in 2H₂O?

• 1

• 2

• 3

• 4