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VSEPR & Molecular Geometry

Authored by Sara Bland

Chemistry

10th - 12th Grade

NGSS covered

Used 404+ times

VSEPR & Molecular Geometry
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This quiz comprehensively covers VSEPR theory and molecular geometry, positioning it squarely at the 10th-12th grade chemistry level. Students must demonstrate mastery of electron pair geometry, molecular shapes, bond angles, and polarity predictions. The questions progress from fundamental definitions of lone pairs and VSEPR theory basics to complex applications requiring students to visualize three-dimensional molecular structures and predict geometries for compounds like PH₃, BCl₃, and NH₄⁺. Core concepts include understanding electron pair repulsion principles, distinguishing between electron geometry and molecular geometry, memorizing standard bond angles (109.5°, 120°, 180°), and applying polarity rules based on molecular symmetry. Students need solid foundational knowledge of Lewis structures, valence electrons, periodic trends, and bonding theory to successfully navigate the molecular visualization and polarity prediction questions that form the heart of this assessment. Created by Sara Bland, a Chemistry teacher in the US who teaches grades 10-12. This quiz serves as an excellent tool for formative assessment during the molecular geometry unit, allowing teachers to gauge student understanding before summative evaluations. The comprehensive question set makes it ideal for review sessions before exams, homework assignments to reinforce classroom learning, or warm-up activities to activate prior knowledge about bonding and electron configurations. Teachers can use individual sections for targeted practice on specific concepts like bond angles or polarity, while the full quiz provides thorough preparation for standardized assessments. This assessment aligns with NGSS HS-PS1-2 (constructing explanations for properties of substances based on molecular structure) and supports Common Core mathematical practices through spatial reasoning and pattern recognition in molecular shapes.

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68 questions

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1.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

 A lone pair is defined as

A pair of bonding electrons
One non-bonding electron
A pair of non-bonding electrons
A pair of electrons on the central atom

2.

MULTIPLE CHOICE QUESTION

10 sec • 1 pt

What is the VSEPR theory used to predict?

Bond Strength
Polarity
Molecular Shape
Electronegativity

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Which molecule would have this molecular geometry?

BF3
CH4
PCl5
CO2

Tags

NGSS.MS-PS1-1

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What molecule could this be? 

BF3
CH4
H2O
CO2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

What molecule could this be? 

H2O
CCl4
PCl5
NaCl

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Who could this molecule be?

CH4
CO2
PCl5
BF3

Tags

NGSS.MS-PS1-1

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

Who could this be? 

CO2
NH3
H2S
CH4

Tags

NGSS.MS-PS1-1

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