LIFE 102 Lecture Notes - Lecture 2: Surface Tension, Heat Capacity, Benzene
Document Summary
What is so special about water: cohesive. There are polar covalent bonds within water molecules. There are hydrogen bonds between water molecules. Cohesion also means that water has a high surface tension: measure of how hard it is to stretch/break the surface of a liquid. What has an unusually high specific heat amount of energy required to change 1 g of water by 1oc. Water changes its temperature less than other liquids when it absorbs the same amount of energy! Water heats up: hydrogen bonds are broken (heat is absorbed) Water cools down: hydrogen bonds form (head is released) Water is most dense at 4oc, not 0oc. If ice sank, all bodies of water would eventually freeze solid, making life impossible on earth. Solvent: the dissolving agent of a solution. Concentration: how much solute is present per volume of solvent in moles (molar (m)) A hydrogen atom in a hydrogen bond between two water molecules can shift.
