CHEM 210 NEWEST COMPREHENSIVE EXAM
QUESTIONS AND ANSWERS SURE A+
✔✔resonance - ✔✔different imaginary valence representations of the same molecule;
increase stability (only e- move)
✔✔resonance hybrid - ✔✔the single, true, unchanging structure of a molecule that is a
weighted average of all resonant structures for the molecule
✔✔resonance orbitals - ✔✔lone pair in contiguous, parallel, pi-bonding p orbitals
✔✔good resonance - ✔✔- all octet
- no charge
- if charged, negative charge is spread over multiple EN atoms
- negative charge is on an EN atom
- positive charge on a not EN atom
✔✔Bronsted-Lowry acid - ✔✔donates H+
✔✔Bronsted-Lowry base - ✔✔accepts H+
✔✔acidity constant (Ka) - ✔✔the exact strength of a given acid in water solution; =
10^(pKa of acid on right - pKa of acid on left)
✔✔pKa - ✔✔= log(Ka); measures acidity from -7 to 60
✔✔relationship between acid and its CB - ✔✔strong acid = weak/stable CB
✔✔relationship between acid strength, Ka, and pKa - ✔✔strong acid = large Ka = small
pKa
✔✔-7 - ✔✔HCl pKa
QUESTIONS AND ANSWERS SURE A+
✔✔resonance - ✔✔different imaginary valence representations of the same molecule;
increase stability (only e- move)
✔✔resonance hybrid - ✔✔the single, true, unchanging structure of a molecule that is a
weighted average of all resonant structures for the molecule
✔✔resonance orbitals - ✔✔lone pair in contiguous, parallel, pi-bonding p orbitals
✔✔good resonance - ✔✔- all octet
- no charge
- if charged, negative charge is spread over multiple EN atoms
- negative charge is on an EN atom
- positive charge on a not EN atom
✔✔Bronsted-Lowry acid - ✔✔donates H+
✔✔Bronsted-Lowry base - ✔✔accepts H+
✔✔acidity constant (Ka) - ✔✔the exact strength of a given acid in water solution; =
10^(pKa of acid on right - pKa of acid on left)
✔✔pKa - ✔✔= log(Ka); measures acidity from -7 to 60
✔✔relationship between acid and its CB - ✔✔strong acid = weak/stable CB
✔✔relationship between acid strength, Ka, and pKa - ✔✔strong acid = large Ka = small
pKa
✔✔-7 - ✔✔HCl pKa
