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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