Feedback for Multiple Choice Quiz 2

  All of the correct answers have a green check mark.
  Incorrect answers have the "red-lit" button next to your choice.
  1. In addition to the correct order indicated, fluorine (F) is the most electronegative element.
  2. The partial negative charge makes water a polar solvent, an extremely important property of water.
  3. All of the other liquids besides benzene are polar. Hydrophobic compounds dissolve best in apolar solvents.
  4. The converse of question 3. The ionic NaCl dissolves easily in polar solvents, e.g. water. The other compounds are all apolar and hydrophobic.
  5. The statement is a fairly complete definition of the hydrogen bond.
  6. In all cases the proton is attached to a more electronegative, or electron withdrawing atom. SH is the weakest hydrogen bond donor of the three. The actual electronegativities are: H=2.1, C=2.5, S=2.5, N=3.0, O=3.5.
  7. An ideal hydrogen bond requires 20 kJ/mol to break, while most covalent bonds are about 400 kJ/mol (=100 kcal/mol).