Which formula represents a polar molecule?
- Mayya Alocci
- Oct 11
- 1 min read
Regents Chemistry Exam August 2025 Question 10
10 Which formula represents a polar molecule?
(1) F2 (3) CO2 (2) CH4 (4) NH3
Solution:
A polar molecule is a molecule that has an assymetric distribution of charge. F2, CO2 and CH4 are all nonpolar molecules. NH3 is a polar molecule. If we draw a Lewis dot structure of it, we can see that the central atom has a lone pair of electrons. Trick:Usually, molecules whose central atom has lone pairs of electrons are polar (there are exceptions). Choice 4 is the correct answer.
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