[CHM 111] Answers

[Lauren Michelle Fowler]

Hey guys,


Here are the answers that I can type, I'll send out the rest in just a minute.


3. ionic bonding: electrostatic attraction between two oppositely charged elements hold bonds together. elements give/accept electrons

 covalent bonds: compounds form between elements with similar properties and they are close enough to share the electrom


4. Ionic bonds occur between metals/non-metals. Covalent bonds occur between two non-metals.


5. Pure covalent bond: netural atoms held together by equally shared electrons

Polar covalent bond: Partially charged atoms held together by unequally shared electrons

Ionic bond: oppositly charged ions held together by electrostatic attraction

Symbol used to denote partial charges: ?



6. a. non-polar

b. polar

c. polar

d. non-polar



8. a. Formal Charge= valence electrons - 1/2(electrons in bonds) - electrons in lone pairs

b. The formal charges of each atom should add up to the overall charge of the compound

c. The magnitude s the absolute value of all the formal charges


10. Bond enthalpy is the enthalpy change associated with breaking a particular bond in one mol of gaseous molecules


11. 392 kJ/mol


12. I threw this problem out and changed it to 8.79 part a. The answer to that is -2579 kJ/mol


diamagnetic: full orbital, should not interact

paramagnetic: slightly magnetic because of unpaired electron


13.

a. tetrahedral

b. t-shapred

c. bent

d. trigonal planar

e. tetrahedral


isomers: compound with the same formula but a different arrangement of atoms in the molecule and different properties

cis: cis isomers have the same atom on one side of the compound (in Dr. Pound's example in class, the two Bromine atoms were on the bottom) while trans isomers have different atoms on one side of the compound (so in Dr. Pound's example, there was both H and Br atoms on the bottom rather than both Br atoms)


Good Luck tomorrow,

Lauren Fowler
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