Expt 1. Comp Study – Flashcards
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Dipole moment of pentane
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0.00
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Dipole moment of CS₂
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0.00
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Dipole moment of Propanone
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3.05
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Dipole moment of DMF
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4.10
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Dipole moment of H₂O
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1.81
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Pentane is not miscible with...
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DMF and H₂O
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CS₂ is not miscible with...
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H₂O
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Propanone is not miscible with...
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nothing, it is miscible with everything
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DMF is not miscible with...
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Pentane
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H₂O is not miscible with...
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Pentane and CS₂
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Like dissolves like means...
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Polar molecules tend to be immiscible with nonpolar molecules
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Trend for average hydrogen bond length
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H₂O < H₂O + ethanol < ethanol
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Trend for average volume
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H₂O < ethanol < H₂O + ethanol
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Is Vactual greater than or less than Vadditive
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Less than, this is because water and ethanol have stronger intermolecular forces than the molecules alone
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Do hydrogen bond lengths explain the relationship?
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No
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The _____ creates a cage where it is the ______ for the hydrocarbon
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water, host
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Dodecahedra has how many pentagonal faces? How many hexagonal?
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12 pentagonal, and 0 hexagonal
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Oblate Polyhedra has how many pentagonal faces? How many hexagonal?
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12 pentagonal, and 2 hexagonal
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Which methane hydrate cavity is larger?
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Oblate Polyhedra
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Is the degree of hydrogen bonding between water molecules diminished because of the presence of the methane solute?
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No
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Which has the more negative/stable energy? Allura, ethyl acetate, or water?
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Water
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Which solvent, ethyl acetate or water has a higher affinity for Allura red dye?
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The Allura red dianion experiences both ion-dipole forces and hydrogen bonding. Thus, it has a higher affinity for the more polar solvent. Water
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What combination is more stable? Allura + ethyl acetate, or Allura + water?
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Allura + Water, because Allura + water has a more negative energy than Allura + ethyl acetate
