Question

water has surface tension because...
hydrogen bonds between surface water molecules resist being stretched.
molecules at the surface make more hydrogen bonds.
cohesion forces are weaker at the surface.
water tends to evaporate from the surface.
there is positive pressure inside the water mass.
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part f
which of the following helps most to explain why water has a high specific heat?
(a) a water molecule can make 4 hydrogen bonds.
(b) the water molecule has exceptionally strong covalent bonds.
(c) water temperature is exceptionally sensitive to heat.
both (a) and (b).
both (b) and (c).

Explanation:

Water's surface tension is due to hydrogen bonds between surface - water molecules that resist being stretched. For the high specific heat of water, a water molecule can make 4 hydrogen bonds, which require a lot of energy to break, thus contributing to high specific heat. The covalent bonds in water are not related to its high specific heat, and water having a high specific heat means it is not extremely sensitive to heat.

Answer:

For the first question: hydrogen bonds between surface water molecules resist being stretched.
For the second question: (a) A water molecule can make 4 hydrogen bonds.