Lewis structures, VSEPR, and Polarity
Authored by Tina Williams
Chemistry
9th - 12th Grade
NGSS covered
Used 188+ times
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About
This quiz thoroughly assesses molecular geometry and chemical bonding concepts that form the foundation of advanced chemistry coursework at the high school level, specifically grades 10-12. The questions systematically evaluate students' understanding of Lewis dot structures, VSEPR (Valence Shell Electron Pair Repulsion) theory, molecular shapes, bond polarity, and overall molecular polarity. Students must demonstrate mastery of multiple interconnected skills: drawing accurate Lewis structures by correctly counting valence electrons and placing bonds and lone pairs, applying VSEPR theory to predict three-dimensional molecular geometries, distinguishing between bond polarity and molecular polarity, and understanding how electronegativity differences determine charge distribution in molecules. The complexity requires students to visualize molecular structures in three dimensions, recognize that molecular shape determines polarity regardless of individual bond polarities, and apply theoretical frameworks to predict real molecular behavior. Created by Tina Williams, a Chemistry teacher in the United States who teaches grades 9-12. This quiz serves as an excellent tool for formative assessment, allowing teachers to gauge student comprehension of these challenging abstract concepts before moving to more advanced topics like intermolecular forces or chemical reactions. The questions work effectively as homework assignments to reinforce classroom instruction, warm-up activities to activate prior knowledge, or review material before unit examinations. Teachers can use individual questions for quick checks during instruction or deploy the entire quiz for comprehensive assessment of student understanding. The content aligns with NGHS-PS1-1 (developing models to predict properties of substances) and supports Common Core mathematical practices through spatial reasoning and model-based thinking that students must employ when working with molecular geometry and polarity concepts.
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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
CO2 has polar bonds but is a NON POLAR molecule. Why?
it has an asymmetrical shape
bond polarity or dipole moment between C and O atoms cancel
there is net dipole moment between C and O atoms in molecule
bond polarity does not exist between C+ and O- atoms
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Does the following reference Polar, Nonpolar, or both:
"electronegativity values are the same"?
Polar
Nonpolar
Both
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Is this molecule polar or nonpolar?
polar
nonpolar
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
According to VSEPR, molecules adjust their shapes to keep which of the following as far away as possible?
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a polar bond, the more electronegative element will assume a partial ________ charge.
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Type of bond between Br & Br
Ionic
Polar Covalent
Nonpolar Covalent
Tags
NGSS.HS-PS1-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which molecule contains bonds with a GREATER polarity?
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