Podcast
Questions and Answers
What does VSEPR theory stand for?
What does VSEPR theory stand for?
Valence Shell Electron Pair Repulsion Theory
Name all of the things that could be considered an electron group.
Name all of the things that could be considered an electron group.
Lone pairs, single bonds, multiple bonds, and single electrons
What bond angle does linear geometry have?
What bond angle does linear geometry have?
180 degrees
A bond angle of 180 degrees would indicate what type of geometry?
A bond angle of 180 degrees would indicate what type of geometry?
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BeCl2 has what type of geometry and what bond angle?
BeCl2 has what type of geometry and what bond angle?
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A geometry of two electron groups and no lone pairs would indicate what?
A geometry of two electron groups and no lone pairs would indicate what?
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What type of geometry and bond angle does CO2 have?
What type of geometry and bond angle does CO2 have?
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If a molecule has three electron groups around the central atom, what is its geometry and bond angle?
If a molecule has three electron groups around the central atom, what is its geometry and bond angle?
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What is the geometry and bond angle of BF3?
What is the geometry and bond angle of BF3?
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If a trigonal planar molecule has a double bond within its geometry, will that bond be larger or smaller than 120 degrees? And will the bond angle of the other single bonds be larger or smaller than 120 degrees?
If a trigonal planar molecule has a double bond within its geometry, will that bond be larger or smaller than 120 degrees? And will the bond angle of the other single bonds be larger or smaller than 120 degrees?
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What is the geometry of HCHO (formaldehyde)?
What is the geometry of HCHO (formaldehyde)?
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How many dimensions do molecules with two or three electron groups around the central atom have?
How many dimensions do molecules with two or three electron groups around the central atom have?
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For molecules with four or more electron groups, what dimension are they?
For molecules with four or more electron groups, what dimension are they?
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What kind of geometry and bond angles do you get with four electron groups?
What kind of geometry and bond angles do you get with four electron groups?
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Methane (CH4) has what kind of geometry and bond angles?
Methane (CH4) has what kind of geometry and bond angles?
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Five electron groups around a central atom assume what type of geometry?
Five electron groups around a central atom assume what type of geometry?
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Explain the bond angles in trigonal bipyramidal geometry.
Explain the bond angles in trigonal bipyramidal geometry.
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What kind of geometry does PCl5 have?
What kind of geometry does PCl5 have?
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If a central atom is surrounded by 6 electron groups, then what is its geometry and bond angles?
If a central atom is surrounded by 6 electron groups, then what is its geometry and bond angles?
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SF6 has what type of geometry and bond angles?
SF6 has what type of geometry and bond angles?
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If a molecule has an electron geometry of tetrahedral but with one lone pair, what is its molecular geometry and bond angle?
If a molecule has an electron geometry of tetrahedral but with one lone pair, what is its molecular geometry and bond angle?
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If a molecule has an electron geometry of tetrahedral but has two lone pairs, what is its molecular geometry and bond angle?
If a molecule has an electron geometry of tetrahedral but has two lone pairs, what is its molecular geometry and bond angle?
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List these in order from most repulsive to least repulsive: 1. bond-bond 2. lone pair-lone pair 3. bond-lone pair.
List these in order from most repulsive to least repulsive: 1. bond-bond 2. lone pair-lone pair 3. bond-lone pair.
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What is water's electron geometry and molecular geometry?
What is water's electron geometry and molecular geometry?
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If a five electron group atom exists with one lone pair what is its electron geometry and molecular geometry?
If a five electron group atom exists with one lone pair what is its electron geometry and molecular geometry?
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If a molecule has a seesaw shape, does the lone pair occupy the axial or equatorial position and why?
If a molecule has a seesaw shape, does the lone pair occupy the axial or equatorial position and why?
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If a molecule has five electron groups and two of them are lone pairs, what is the electron geometry and molecular geometry?
If a molecule has five electron groups and two of them are lone pairs, what is the electron geometry and molecular geometry?
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If a molecule has five electron groups but three of the groups are lone pairs surrounding the central atom, what is the electron geometry and molecular geometry?
If a molecule has five electron groups but three of the groups are lone pairs surrounding the central atom, what is the electron geometry and molecular geometry?
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If a molecule has 6 electron groups and one of them is a lone pair, what is the electron geometry and molecular geometry?
If a molecule has 6 electron groups and one of them is a lone pair, what is the electron geometry and molecular geometry?
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If a molecule has 6 electron groups and two of them are lone pairs, what is the electron geometry and molecular geometry?
If a molecule has 6 electron groups and two of them are lone pairs, what is the electron geometry and molecular geometry?
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A molecule with a trigonal bipyramidal molecular geometry has a bond angle of....
A molecule with a trigonal bipyramidal molecular geometry has a bond angle of....
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Give the molecular geometry for BrF3.
Give the molecular geometry for BrF3.
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Geometry of a central atom with four electron groups and one of them is a lone pair...
Geometry of a central atom with four electron groups and one of them is a lone pair...
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Identify the number of groups around a molecule with sp hybridization.
Identify the number of groups around a molecule with sp hybridization.
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Is a molecule with linear geometry polar or nonpolar?
Is a molecule with linear geometry polar or nonpolar?
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Is a molecule with bent geometry polar or nonpolar?
Is a molecule with bent geometry polar or nonpolar?
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Is a molecule with trigonal planar geometry polar or nonpolar?
Is a molecule with trigonal planar geometry polar or nonpolar?
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Is a molecule with tetrahedral geometry polar or nonpolar?
Is a molecule with tetrahedral geometry polar or nonpolar?
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Is a molecule with trigonal pyramidal geometry polar or nonpolar?
Is a molecule with trigonal pyramidal geometry polar or nonpolar?
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The number of electron groups around a molecule will always be one more than whatever its hybridization is... So what is the number of electron groups around a molecule with the hybridization of: 1. sp 2. sp3 3. sp3d2?
The number of electron groups around a molecule will always be one more than whatever its hybridization is... So what is the number of electron groups around a molecule with the hybridization of: 1. sp 2. sp3 3. sp3d2?
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A sp3d hybridized has a molecular geometry of seesaw, how many lone pairs are around the central atom?
A sp3d hybridized has a molecular geometry of seesaw, how many lone pairs are around the central atom?
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Give the hybridization for O in OF2.
Give the hybridization for O in OF2.
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Give the hybridization of S in SF6.
Give the hybridization of S in SF6.
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Give the hybridization of Br in BrCl3.
Give the hybridization of Br in BrCl3.
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Determine the electron geometry and molecular geometry of CO3 2-.
Determine the electron geometry and molecular geometry of CO3 2-.
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The bond angle in NBr3, which has four electron groups and one of them is a lone pair, is...
The bond angle in NBr3, which has four electron groups and one of them is a lone pair, is...
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What is a side-by-side overlap of p orbitals called?
What is a side-by-side overlap of p orbitals called?
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What is an end-to-end overlap of p orbitals called?
What is an end-to-end overlap of p orbitals called?
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What is the number of sigma and pi bonds within a single bond?
What is the number of sigma and pi bonds within a single bond?
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What is the number of sigma and pi bonds within a double bond?
What is the number of sigma and pi bonds within a double bond?
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What is the number of sigma and pi bonds within a triple bond?
What is the number of sigma and pi bonds within a triple bond?
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A molecule with a seesaw molecular geometry has a bond angle of...
A molecule with a seesaw molecular geometry has a bond angle of...
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A molecule with a T-shaped molecular geometry has a bond angle of...
A molecule with a T-shaped molecular geometry has a bond angle of...
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Give the molecular geometry and electron geometry of BrF5.
Give the molecular geometry and electron geometry of BrF5.
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Soap works with water because...
Soap works with water because...
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Bond angle of trigonal planar
Bond angle of trigonal planar
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Bond angle of tetrahedral
Bond angle of tetrahedral
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Bond angle of linear
Bond angle of linear
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Study Notes
VSEPR Theory and Electron Groups
- VSEPR stands for Valence Shell Electron Pair Repulsion Theory, used to predict molecular shapes based on repulsion between electron groups.
- Electron groups include lone pairs, single bonds, double bonds, and single electrons, affecting molecular geometry.
Molecular Geometries and Bond Angles
- Linear geometry features a bond angle of 180 degrees, as seen in molecules like BeCl2 and CO2.
- Trigonal planar geometry has a bond angle of 120 degrees, typical for molecules with three electron groups, such as BF3.
- Tetrahedral geometry possesses bond angles of 109.5 degrees, with methane (CH4) as an example. Molecules can shift from ideal angles due to double bonds or lone pairs.
- Trigonal bipyramidal geometry includes bond angles of 120 degrees (equatorial) and 90 degrees (axial), observed in PCl5, influencing the arrangement of electron groups and lone pairs.
Electron and Molecular Shapes with Lone Pairs
- A molecule with tetrahedral electron geometry and one lone pair adopts a trigonal pyramidal shape (bond angle 107 degrees).
- If there are two lone pairs in a tetrahedral arrangement, the molecular shape is bent with angles around 104.5 degrees.
- For octahedral geometry, with six electron groups, bond angles are 90 degrees (e.g., SF6). A lone pair alters this to a square pyramidal shape.
Polarity and Hybridization
- Linear and trigonal planar geometries are generally nonpolar, while geometries like bent and trigonal pyramidal are polar due to asymmetry.
- Hybridization types correlate with electron groups: sp for 2 groups, sp3 for 4, sp3d for 5, and sp3d2 for 6.
- Bonds consist of sigma and pi bonds, with single bonds having 1 sigma bond, double bonds having 1 sigma and 1 pi bond, and triple bonds having 1 sigma and 2 pi bonds.
Special Cases and Unique Configurations
- A seesaw molecular geometry has an equatorial lone pair, creating angles less than 120 degrees between equatorial bonds and less than 90 degrees for axial bonds.
- T-shaped structures also yield bond angles less than 90 degrees, demonstrating the effect of lone pairs on molecular symmetry and angles.
- BrF5 exhibits a square pyramidal molecular geometry while maintaining an octahedral electron geometry, showcasing how lone pairs reshape molecule arrangements.
Additional Notes
- Soap functions in water by having hydrophobic ends that bind with oil, illustrating the principle of polarity in chemical interactions.
- Recognizing the bond angles associated with various molecular geometries is crucial for understanding molecular shape and reactivity in chemical processes.
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Description
Test your understanding of VSEPR Theory and how electron groups influence molecular shapes and bond angles. This quiz covers linear, trigonal planar, tetrahedral, and trigonal bipyramidal geometries, as well as the effects of lone pairs on molecular geometry.
