12 5 points describe briefly the differences between

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12. (5 points) Describe briefly the differences between normal liquids and liquid crystals.
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30. The main reason that the boiling point of NH3 is greater than the boiling point of PH3 is due to: A. dipole-dipole interactions B. dispersion forces C. snonger covalent bond forH-N than H-P hydrogen bonding E. ion-dipole interactions 3 1. NaCl -is more soluble in H20 than CC14. Which of the following forces is most responsible? @ ion-dipole interactions 32. With which of the following species can CH30H form hydrogen bonds? 1- (CH3)3N 2. CH3OCH3 3. (CH3)2C=0 4. CH30H 33. With which of the following species can (CH3)3N form hydrogen bonds? 1- (CH3)3N 2. CH30CHs 3. (CH3)2C=O 4. CH3OH @ 4 only . 34. Generally speaking, the strongest intermolecular interaction is: A. a polar covalent bond B. a nonpolar covalent bond C. a dipole-dipole interaction a hydrogen bond E. ' dispersion forces 35. Which one of the following statements is always TRUE: a Miscible liquids dissolve in each other in all proportions 36. In which of the following solvents would KBr have the greatest solubility?
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37. A nonvolatile solute effects the freezing point and boiling pobt of a solvent as follows: 9. (7 points) Which of the following compounds dws not form intermolecular- hydrogen' . bonds in pure liquid? (circle one) --- disprr.rp-. 9 NH3 CH3-CH2-CH2-OH G & ~ . ~ ~ CH3-SH H2S04 H a 0 4 NH20H NH2-NH2 t stsww1U* PIPK &LC OH ...
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