Feedback for Multiple Choice Quiz 2
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Incorrect answers have the "red-lit" button next to your choice.
- In addition to the correct order indicated, fluorine (F) is the most electronegative element.
- The partial negative charge makes water a polar solvent, an extremely important property of water.
- All of the other liquids besides benzene are polar. Hydrophobic compounds dissolve best in apolar solvents.
- The converse of question 3. The ionic NaCl dissolves easily in polar solvents, e.g. water. The other compounds are all apolar and hydrophobic.
- The statement is a fairly complete definition of the hydrogen bond.
- 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.
- An ideal hydrogen bond requires 20 kJ/mol to break, while most covalent bonds are about 400 kJ/mol (=100 kcal/mol).