Video Transcript
The picture shows water molecules
in a uniform fixed hexagonal arrangement created by hydrogen bonds. What state of matter would you
expect to find water in when it is in this structural arrangement? (A) Ice, solid; (B) water, liquid;
(C) steam, gas.
The dashed lines in the diagram
represent hydrogen bonds. Hydrogen bonds are the attraction
between a hydrogen atom and the partial negatively charged end of another
molecule. In the liquid state, the hydrogen
atom of one water molecule forms hydrogen bonds with the partial negatively charged
oxygen atom of another molecule. The arrangement of the molecules is
nonuniform, and the molecules rotate and move around, constantly breaking and
reforming hydrogen bonds. As the temperature drops and liquid
water turns into solid ice, the molecule arrangement becomes uniform. In ice, the water molecules form
hydrogen bonds in a repeating hexagonal pattern. This hexagonal arrangement is shown
in the figure.
Therefore, the state of matter we
would expect to find water in when the molecules are in a fixed hexagonal
arrangement is answer choice (A) ice, solid.
