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10 Cards in this Set
- Front
- Back
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What is an intermolecular force?
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Attraction between molecules. A weak attraction.
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Whats an intra-molecular force?
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It's the covalent bond holding a molecule together.
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What happens to the intermolecular when a substance melts or boils?
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The intermolecular force are broken.
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What happens to the intermolecular when a substance condenses?
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Intermolecular forces are formed.
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What types of intermolecular forces are there?
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Ion-dipole forces;
Dipole-dipole forces; London dispersion forces; Hydrogen bonding. |
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What are the characteristic of a Ion-dipole force?
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-Interactions between an anion and a dipole, Na+ and water for example.
-Strongest of all forces. |
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What are the characteristic of a Dipole-dipole force?
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-It exist between neutral polar molecules that are close together.
-It's weaker than ion-dipole forces. -Its polarity increases as the closer the molecules are to have the same mass and size. |
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What are the characteristic of a London dispersion force?
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-It's the weakest of all intermolecular forces.
-The nucleus of one atom attract the electrons of the adjacent molecule or atom. -Increases as the molecular weight increases. -Exist between all molecules. -Is dependent of the shape of the molecule. -Is lower between spherical molecules and higher between sausage-like molecules. |
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The forces between instantaneous dipoles is called what?
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London dispersion force.
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What are the characteristic of a Hydrogen bond?
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-One part of the bond involves a hydrogen atom.
-The hydrogen must be attached to a strongly electronegative atom.(oxygen, nitrogen or fluorine.) -Partial but strong charge. -Can be found in water, DNA, RNA, proteins, alcohols, aldehydes, which have high boiling point/melting point than other compounds. |
