Problem 1.10: The chapter describes the water molecule as
From Chapter 1 Problem Set. Level 3: System Integration.
Question
The chapter describes the water molecule as “asymmetric, polar, and carrying stored electrical tension.” In 2–3 sentences, explain how each of these properties traces back to oxygen’s lone electron pairs and the resulting molecular geometry.
Answer
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Oxygen carries two lone electron pairs that repel the bonding pairs shared with hydrogen, forcing the molecule into a bent shape (104.5°) rather than a straight line. This asymmetry means the two polar O–H bonds do not cancel, making the molecule permanently polar. The permanent separation of partial positive and partial negative charge is the “stored electrical tension” - it is locked into the geometry by the lone pairs. This is the basis of hydrogen bonding in water.