select *; spacefill 23%; wireframe 0.15; color cpk-ball and stick
select *; spacefill 0%; wireframe 0.15; color cpk-wireframe
select *; spacefill only; color cpk-spacefill
~<h5>In solid water, ice, each water molecule makes hydrogen bonds with four other water molecules to form the rigid solid. Ice floats and ice expands upon freezing because the geometry of four rigid hydrogen bonds per water molecule in a hydrogen bonding network results in more empty space in the sample. In other words, on average in liquid water the molecules are closer to each other and take up less space. Density is mass per volume so a substance with the same amount of mass in a large space is less dense. Substances with lower density float on substances with higher density. While there are many crystalline forms of ice, the hexagonal form seen here is the most commonly observed here on earth. </h5>
hbonds calculate; hbonds on-HBonds on
hbonds off-HBonds off
