All topicsSulfur tetrafluoride adopts a see-saw geometry with two axial F atoms with a F-S-F angle of about 180º and two2018 national · question 5411%Which comparisons of bond angles are correct? I. The bond angle in NH₃ is greater than the bond angle in NF₃. 2024 national · question 5215%Which statement best describes the relative Lewis acidity of BF₃ and BCl₃?2024 national · question 5116%
Bonding and molecular structure
This is block 9 of 10, questions 49–54 on both the local section exam and national Part I. Across the 41 national questions where ACS published item statistics, qualifiers answered 44% correctly, which makes it the third hardest of the 10.
What it covers
Lewis structuresVSEPRhybridizationmolecular orbital theorypolaritybond orderresonance
Where qualifiers lose points
% who got it rightThese are the bonding and molecular structure questions the fewest national qualifiers answered correctly. If you can do these, the block is not your problem.
Every question is from a published past exam and carries its source. Practice adapts to what you miss, and anything you get wrong comes back on a spaced schedule. No account needed. See the other nine blocks.