CHEM 121 EXAM 3 FINAL PAPER VERIFIED QUESTIONS ACCURATE SOLUTIONSCHEM 121 EXAM 3 FINAL PAPER VERIFIED QUESTIONS ACCURATE SOLUTIONS

CHEM 121 EXAM 3 FINAL PAPER VERIFIED QUESTIONS ACCURATE SOLUTIONS
CHEM 121 EXAM 3 Questions and Answers Verified
Solutions Latest Update 2026/2027

Question:
Two of the four electron pairs on each carbon are shared by both carbons. These two pairs of
electrons thus cannot be separated to as great an extent as if they were lone pairs or pairs shared by
different atoms, for if they were, it would be physically impossible for them to be shared.
Consequently, these two electron pairs, which must stay together, are separated as much as possible
from the other two electron pairs. These three "domains" thus form an equilateral triangle about the
central carbon atom.

Answer:
Explain why the octet of electrons about each carbon atom in ethene, C2H4, are not arranged even
approximately in a tetrahedron.



Question:
linear, 180

Answer:
2 atoms around the central atom:



Question:
trigonal planar, 120

Answer:
3 atoms around the central atom:



Question:
bent, less than 120

Answer:
2 atoms and 1 electron pair around the central atom:

,Question:
tetrahedral, 109.5

Answer:
4 atoms around the central atom:



Question:
trigonal pyramid, less than 109

Answer:
3 atoms 1 electron pair around the central atom:



Question:
bent, << 109

Answer:
2 atoms and 2 electron pairs around the central atom:



Question:
trigonal bipyramid, 90

Answer:
5 atoms around the central atom:



Question:
seesaw, < 90 and < 120

Answer:
4 atoms and 1 electron around the central atom:

, Question:
T-shape, <90

Answer:
3 atoms and 2 lone pairs around the central atom:



Question:
linear, 180

Answer:
2 atoms and 3 lone pairs around the central atom:



Question:
octahedral, 90

Answer:
6 atoms around the central atom:



Question:
square pyramid, <90

Answer:
5 atoms and 1 lone pair around the central atom:



Question:
square planar, 90

Answer:
4 atoms and 2 lone pairs around the central atom:



Question: