Question

which best describes how charges are distributed on a water molecule?
the oxygen end is positive relative to the end with the two hydrogen atoms.
the oxygen end is negative relative to the end with the two hydrogen atoms.
the charge is neutral and equal throughout the molecule.
the oxygen end is neutral; one of the hydrogen atoms has a slight positive charge and the other hydrogen atom has a slight negative charge.
part d
relative to other substances, water tends to resist changes in temperature. why?
water is extremely dense, and like all dense materials, it can absorb a great deal of heat with a relatively small change in temperature.
water is abundant. large bodies of water resist changes in their temperature simply because they are massive objects.
water is highly cohesive. its molecules tend to resist increases in their motion. when water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules.
water is highly adhesive. pure water does not resist temperature change, but if water is bonded to other substances, molecules will tend to \stay put\ and resist increases in their motion.

Explanation:

In a water molecule, oxygen is more electronegative than hydrogen. It attracts the shared - electrons more strongly, making the oxygen end negative and the hydrogen - end positive. For the second question, water's high cohesion due to hydrogen bonding means energy is used to break hydrogen bonds when heated rather than just increasing molecular motion, so it resists temperature changes.

Answer:

The oxygen end is negative relative to the end with the two hydrogen atoms.
Water is highly cohesive. Its molecules tend to resist increases in their motion. When water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules.