Question

multiple choice 1 point
what property of water makes it an excellent solvent for polar molecules?
its polarity and ability to form hydrogen bonds
its nonpolar bonds
its high melting point
a. its atomic mass
multiple choice 1 point
why do molecules with polar bonds sometimes end up nonpolar overall?
polar bonds automatically make the molecule polar
the molecule is made of only one atom
electrons are shared equally in all bonds
the polar bonds are arranged symmetrically, so dipoles cancel

Explanation:

• For question 4: Water is polar (has a partial positive and partial negative end) and can form hydrogen bonds. Polar solvents dissolve polar solutes well. Non - polar bonds (second option) would make it a non - polar solvent. High melting point (third option) and atomic mass (fourth option) are not related to its solvent properties for polar molecules.
• For question 5: A molecule can have polar bonds but be non - polar overall if the polar bonds are arranged symmetrically. For example, in \(CO_2\), the \(C = O\) bonds are polar, but the linear symmetry of the molecule causes the bond dipoles to cancel. If polar bonds automatically made the molecule polar (first option), there would be no non - polar molecules with polar bonds. A molecule made of one atom (second option) has no bonds. If electrons are shared equally (third option), the bonds are non - polar.

Answer:

1. Its polarity and ability to form hydrogen bonds
2. The polar bonds are arranged symmetrically, so dipoles cancel