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22 Cards in this Set
- Front
- Back
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what quantum mechanical view of a molecule |
orbitals from the atoms overlap (applies to whole atom) |
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What is a sigma bond |
when 2 atomic orbitals combine to form a molecular orbital that is SYMMETRICAL around the axis connecting 2 atomic nuclei |
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What is a pi bond |
the bonding electrons are most likely to be found in sausage-shaped regions above and below the bond axis |
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What is the VSEPR theory |
VALANCE SHELL ELECTRON PAIR REPULSION THHEORY states that the repulsion between electron pairs causes molecular shapes to adjust so that the valance electrons pairs stay as far apart as possible |
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Because of the VSEPR theory what is the actual bond angle of ammonia |
107 |
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what is the value of the angle of water molecules |
105 |
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what is a non polar covalent bond |
when atoms pull equally at the electrons |
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what is a polar bond |
occurs when the electron aren't shared equally |
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how does a polar bond get stronger |
when there more electronegativity |
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do polar bonds always make polar molecules |
no |
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what is a dipole |
a molecule with 2 poles |
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what happens when polar molecules are placed between charged plates |
become aligned with the poles |
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what is produced when polar bonds are arranged symmetrically |
they often cancel out resulting in a non polar molecule |
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What are Van der Waals Forces named after |
a dutch chemist |
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what is a dipole interaction |
occurs when polar molecules are arranged to one another |
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what are dispersion forces (aka what?) |
they occur when the electrons move away from one end of a non polar molecule creating a temporary dipole *aka London forces* |
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what are hydrogen bond |
hydrogens strong tendency to have positive charge which is attracted to an unshared par of electrons on another strongly electronegative atom |
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what is the strength of a hydrogen bond
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5% as strong as an average covalent bond |
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what do physical properties of a compound depend on |
the type of bonding |
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what are network solids |
solids where the atoms are all covalently bonded together |
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how do you melt a network solid |
break a covalent bond |
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what is an example of a network solid AND what does it do before it melts |
diamonds (single molecule) vaporize |
