Intermolecular Forces

AP Chemistry· difficulty 2/5

Ice is less dense than liquid water because

A
$H-bonds in ice form a relatively open hexagonal lattice with more empty space than liquid$
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B
$Ice has no H-bonds$
C
$Water freezes at low temperature$
D
$Ice has fewer molecules$

Explanation

Each water in ice has 4 fixed H-bond partners arranged tetrahedrally; this open structure leaves empty space. Liquid water packs more closely.

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