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Shapes and Polarity

QuestionAnswer
What does VSEPR stand for? Valance Shell Election Pair Repulsion
What counts as an electron group? Single bond,double bond,triple bond, or lone pair
2 electron groups =? Linear 180º
3 electron groups =? Trigonal Planar 120º
4 electron groups =? Tetrahedral 109.5º
3 bonds +1 long pair=? Trigonal pyramidal 109
2 bonds +2 lone pairs=? Bent 104.5
What makes a bond polar? Large electronegativity difference
When is a molecule polar? When it has polar bonds and the dipoles don’t cancel
If a molecule is asymmetrical, is it usually polar or non polar? polar (dipoles cancel)
Weakest IMF London dispersion forces
Which molecules have London dispersion forces? All molecules (only IMF in nonpolar ones)
Dipole- dipole happens between what types of molecules Polar molecules
Hydrogen bonding happends when H is bonded to what? F,O, or N
What type of compounds have the lowest MP and BP? Non polar Covalent
Describe when hydrogen bonding can occur. Which is Stronger H-Bonding or just regular dip-dip. Why? Hydrogen bonding occurs when Hydrogen is bonded to F,O or N. Hydrogen bonding is stronger than regular dipole-dipole interactions because high electronegativity of F, O or N.
Why don't polar liquids mix with non polar liquids? Polar liquids don't mix with non polar liquids because like dissolves like
Are symmetrical shapes polar or non polar? non polar
What is VSEPR? Valance Shell electron pair repulsion is a chemical model used to predict the 3D geometry of molecules principle that valence electron pairs surrounding a central atom will arrange themselves as far apart as possible to minimize repulsion
Created by: user-2002294
 

 



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