Answer (score: 1): 16. Select two compounds with a polar covalent bond. 1) I_(2) 2) KI 3) N_(2)O_(5) 4) CaBr_(2) 5) H_(2)O Answer (score:0.5):

The correct answers are 3) $N_{2}O_{5}$ and 5) $H_{2}O$.<br /><br />A polar covalent bond is a type of chemical bond where two atoms share a pair of electrons, but the electrons are not shared equally. This results in a partial positive charge on one atom and a partial negative charge on the other atom, creating a dipole moment.<br /><br />In the given options, $N_{2}O_{5}$ and $H_{2}O$ are the two compounds with polar covalent bonds. In $N_{2}O_{5}$, the nitrogen atoms are bonded to oxygen atoms with polar covalent bonds. Similarly, in $H_{2}O$, the hydrogen atoms are bonded to the oxygen atom with polar covalent bonds.<br /><br />On the other hand, $I_{2}$ is a nonpolar covalent bond because the two iodine atoms have the same electronegativity, resulting in an equal sharing of electrons. KI and $CaBr_{2}$ are ionic compounds, where the atoms are held together by strong electrostatic forces rather than covalent bonds.