Question

question 21. which of these explains the relationships between hydrogen bonds and the properties of water? a. hydrogen bonds are permanent bonds allowing for adhesion between water molecules. b. hydrogen bonds are strong bonds between water molecules that support waters ability to moderate temperature. c. hydrogen bonds form between a hydrogen atom and an oxygen atom in adjacent water molecules, which supports cohesion. d. hydrogen bonds form between hydrogen atoms in adjacent water molecules, allowing ice to float in water.

Explanation:

Hydrogen bonds are not permanent bonds (so A is wrong). They are relatively weak intermolecular forces (so B is wrong). Hydrogen bonds form between a hydrogen atom (from one molecule) and an electronegative atom (like oxygen in adjacent water molecules), which is about cohesion (C is correct). Hydrogen bonds in ice form between hydrogen and oxygen atoms (not hydrogen - hydrogen), and the open lattice structure in ice (due to hydrogen bonding) makes it less dense than liquid water (but D's description of hydrogen - hydrogen bond formation is wrong).

Answer:

C. Hydrogen bonds form between a hydrogen atom and an oxygen atom in adjacent water molecules, which supports cohesion.