MCAT 5B · Chem/Phys
Bonding, Molecular Structure and Stereochemistry
437 original Anki flashcards, an 11-page illustrated study guide, a 3-page cheat sheet and 55 practice questions for MCAT content category 5B.
What is inside
- deck.apkg437 original Anki flashcards (196 short answer, 126 multiple choice, 31 cloze, 58 true/false, 26 image occlusion), 29 original diagrams
- guide.pdf11-page illustrated study guide that explains the ideas
- cheatsheet.pdf3 printable pages, US Letter at 100 percent
- questions.pdf55 original MCAT-style practice questions with explanations, including 3 passage-based sets
- README.txtimport steps
- 196 short answer
- 126 multiple choice
- 31 cloze
- 58 true/false
- 26 image occlusion
Topics (20)
- 01LeLewis structures and formal charge
- 02ReResonance
- 03VsVSEPR geometry
- 04HyHybridization
- 05SiSigma and pi bonds
- 06BoBond length, strength and polarity
- 07MoMolecular polarity and dipole moment
- 08MoMolecular orbital basics
- 09InIntermolecular forces
- 10HyHydrogen bonding
- 11StStructural isomers
- 12CoConformational isomers and ring strain
- 13ChChirality and chiral centers
- 14CaCahn-Ingold-Prelog R and S
- 15EnEnantiomers and diastereomers
- 16MeMeso compounds
- 17CiCis-trans and E-Z isomerism
- 18OpOptical activity and specific rotation
- 19RaRacemic mixtures and resolution
- 20AbAbsolute versus relative configuration
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Try it · sample practice questions
Five questions from the pack.
Q1What is the formal charge on sulfur in the SO2 structure with one S=O double bond, one S-O single bond and one lone pair on S?
D. Sulfur has 6 valence electrons, 2 nonbonding electrons (one lone pair) and 3 bonds (one double and one single). The formal charge is 6 - 2 - 3 = +1. Zero would need 4 bonds with the same lone pair. A charge of -1 or +2 does not match the electron count of this structure.
Q2In which compound is the C-H bond most acidic?
B. The sp carbon of propyne has 50 percent s character, stabilizing the conjugate base (pKa about 25). Propene's sp2 C-H (about 44) and the alkane C-H bonds (about 50) are far less acidic.
Q3Which compound has the highest boiling point?
D. Octane is linear and has the most electrons and surface area, so its London forces are strongest. Hexane and propane are smaller. 2,2,3,3-Tetramethylbutane is a compact, branched C8 isomer that has less surface contact and boils lower than octane.
Q4How many stereocenters are in the open-chain form of glucose, an aldohexose (CHO-CHOH-CHOH-CHOH-CHOH-CH2OH)?
B. C2 to C5 each carry four different groups, while C1 (CHO) and C6 (CH2OH) are not stereocenters. That is four stereocenters and 2^4 = 16 aldohexose stereoisomers.
Q5How many stereoisomers does 2,3-butanediol have?
D. It has two stereocenters with identical ends, so the (R,S) form is meso. The stereoisomers are (R,R), (S,S) and meso, giving three rather than four.
Those are real questions from the pack, word for word.