Blackline Master 3.3-1
NAME: ___________________________DATE:___________________________
3.3-1 Determining Molecular Polarity
Write a short answer to each of these questions.
1. How does the polarity of a molecule that is composed of just two atoms relate to the polarity of the covalent
bond between those atoms?
2. The electronegativity of hydrogen is 2.1, and the electronegativity of bromine is 2.8. Is hydrogen bromide,
HBr, a polar molecule or a non-polar molecule? Support your answer. If it is polar, identify the positive end
and the negative end of the molecule.
3. Which two properties must be analyzed to determine whether a polyatomic molecule is polar or non-polar?
4. The electronegativity of carbon is 2.5, and the electronegativity of sulfur is 2.5. Is carbon disulfide, CS2,
a polar molecule or a non-polar molecule? Support your answer. If it is polar, identify the positive end and
the negative end of the molecule.
5. The electronegativity of carbon is 2.5, the electronegativity of hydrogen is 2.1, and the electronegativity
of fluorine is 4.0. Is fluoromethane, CH3F, a polar molecule or a non-polar molecule? Support your answer.
If it is polar, identify the positive end and the negative end of the molecule.
BLM 3.3-1
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