SI
11/5/15
CHEM 177
Dr. Jenks
Lauren D.
Connect the term with its definition:
Resonance
Structures of a molecule with the same molecular
Structure
formula and same number of electrons, but the placement of the
electrons varies from structure to structure.
Isomer
Structures of a molecule with the same molecular formula and
same number of electrons, but the placement of the electrons AND
ATOMS varies from structure to structure
Place Single, Double, and Triple bond in order:
Shortest to longest
Largest ΔΗ to smallest ΔΗ
Strongest to weakest
Follow up Question:
How does you answer to the last question compare to the order of strength
(strongest to weakest) of the FIRST, SECOND, and THIRD bonds (rather than single,
double, triple)?
Formal Charges:
Equation:______________________ - _____________________
Add lone pairs and calculate the formal charge for each atom:
N-SiΞO
why?
N=Si=O
NΞSi-O
Which is most preferred and
Draw, label formal charges:
CH5N
CH2O
CH3CO2H
BCl3
Using the table of average bond enthalpies (Ask and I shall provide),
determine the total bond enthalpy for the two isomers below and use the
values to determine which isomer is more stable
SI
11/5/15
CHEM 177
Dr. Jenks
Lauren D.