Which type of formula shows an element symbol for each atom and a line for each bond between atoms?

June 2017 NY Regents Chemistry Exam

7 Which type of formula shows an element symbol for each atom and a line for each bond between atoms?

(1) ionic
(2) structural
(3) empirical

(4) molecular

Solution: Structural formula shows the connection (bonds) between atoms in a molecule. For example, CO2 is O=C=O. Empirical formula has atoms with lowest whole number ratio such as NH3. Molecular formula shows the number of atoms of each element in a molecule such as C2H4.

Answer: 2

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