Chemical Bonding: The Exam-Eve Decision Rules
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Exam triage
0:00 - 0:27
The four-item payoff order: stability, transfer, sharing, then properties.
Stability: duplet and octet
0:27 - 1:07
Define a chemical bond and distinguish the duplet rule from the octet rule.
Electrovalent bonding
1:07 - 2:03
Use electron transfer, ion charges, and charge balance to form NaCl and MgCl₂.
Covalent bonding
2:03 - 2:52
Connect one, two, and three shared pairs to single, double, and triple bonds.
H₂O, NH₃, and CCl₄
2:52 - 3:42
Apply the Lewis-structure routine and track lone pairs in the required molecules.
Ionic versus covalent properties
3:42 - 4:44
Explain melting point, solubility, and conductivity through particles and their mobility.
Final exam pass
4:44 - 5:48
Review the decision rules, reason-based answers, and the three traps most likely to cost marks.