3. Chemical Principles of Microbiology

What property of the bond between a Hydrogen (H) atom and an Oxygen (O) atom in a molecule of water
makes it a polar bond?

Which of the following images below is the most likely way that two water molecules would interact?

What type of bond holds the following atoms together?

a. Li+ and Cl- in LiCl

b. carbon and oxygen atoms in methanol

c. oxygen atoms in O₂

d. a hydrogen atom of one nucleotide to a nitrogen or oxygen atom of another nucleotide in:

<IMAGE>

CIRCLE two covalent bonds and two hydrogen bonds in this image; label them. BOX a polar covalent bond. <IMAGE>