These are extremely simple questions — basic biology — but I would like to make sure that the way I have answered is at the very least correct.
- Hydrogen bonds are very weak, so how is it possible that they are so important in the properties of water? Hydrogen bonds in water provide many characteristic benefits to water: cohesion (holding water molecules together), high specific heat (absorbing heat when breaking, releasing heat when forming; minimizing temperature change), high heat of vaporization (several hydrogen bonds must be broken in order to evaporate water), lower density of ice (molecules in ice are spaced farther apart), and solubility (polar molecules are attracted to ions and polar compounds, making them soluble in water).
- Why do we feel cooler immediately after we go swimming than we do after we have fully dried off? We feel cooler immediately after we go swimming than we do after we have dried off because it takes a lot of heat to evaporate water; however, once we dry off we remove much of the water from our skin, and the water is evaporated much more quickly.
- If water were non-polar, would our temperature heat up less quickly or more quickly if we went outside on a hot day? Why? More quickly. Because hydrogen bonds within water slow down the movement of molecules and allow for water to have a very high specific heat.