Please solve all questions Ulecular Geometry Prelab Quiz Consider the following
ID: 588931 • Letter: P
Question
Please solve all questions Ulecular Geometry Prelab Quiz Consider the following structures: CH4 and NH3 Using Table 1 in the lab handout, evaluate whether each of the following is the same or different between these compounds: Total valence electrons in the structure: Select an answer Total areas of electron density around Same Select an answer central atom: Different # of areas of bonding around central | Select an answer atom # of lone electron pairs on the central irs on the central Select an answer | Select an answer atom Electronic geometry of the molecule: Select an answer Molecular geometry of the molecule: |!Select an answer Polarity of the molecule Select an answer Using the table above, what is the best reason for the differences noted? O The differences result from the difference outer (non-central) atom. O The differences result from the presence of lone pairs in the structure. O The differences result from the different central atom. - The differences do not result from the atoms themselves but from a set of rules governing how atoms should behave. Points possible: 2 Unlimited attempts
Explanation / Answer
a)
CH4:
valence electrons --> C = 4, H = 1, then 4 + 4*1 = 8
electron density areas --> none, this is nonpolar
# areas around central atom --> 4, each H
# lone pairs --> none, all electrons are used in bonding
electronic geometry = tetrahedral
molecualr geometry --> tetrahedral
Poalrity --> nonpolar, no poles
b)
NH3:
valence electrons --> N = 5, H = 1, then 5 + 3*1 = 8
electron density areas --> Top of nitrogen, lone pairs presenceand Hydrogen (bottoms)
# areas around central atom --> 4 --> 3 for H and 1 for lone pair
# lone pairs --> 1 lone pair in nitrogen
electronic geometry = tetrahedral
molecualr geometry --> pyrdamidal
Poalrity --> polar, due to lone pairs