University:
University of Pennsylvania
Course:
CHEM 1012 | General Chemistry I
Academic year:

2021
Views:

342

Pages:

3
Author:

esfredint7qo

22/22 At great! Quiz #1: Chemistry fundamentals Determine the valence electron count and draw Lewis structures for the following molecules, including all lone pairs and formal charges where appropriate. a. CH₃CHCHOCH₃ #V.E. = 30 [Hand drawn structural formula with lines, carbons, hydrogens, and oxygen.] no FC b. O₃ (not cyclic) #V.E. = 18 [Hand drawn structural formula of O₃ with lone pairs and formal charges.] c. NO₃⁻ #V.E. = 24 [Hand drawn structural formula of NO₃⁻ with lone pairs and formal charges.] 12/12 good job! Both H₂O and CO₂ contain polar bonds. However, H₂O is a liquid at room temperature, but CO₂ is a gas. Fully explain the reasons for this observation starting from a molecular level, using structures if necessary. [Hand drawn Lewis structure of H₂O] *Polar Bonds * V 4 dipoles *H * V *H *V [Hand drawn Lewis structure of CO₂] O=C=O V non-polar V dipoles cancel V *London * V IMF