BIOL-K - Biology BIOL-K 101 Lecture Notes - Lecture 3: Heat Capacity, Emergence, Sodium Chloride

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Concept 3. 2: what emergent properties of life water contribute to earth"s suitability for life: four of water"s properties that facilitate an environment for life are a. i. Amazing property i: water sticks to itself: water molecules are a. i. Cohesive: form hydrogen bonds with each other a. ii. Amazing property ii: water expands on freezing a. Ice: less dense than water: liquid water: hydrogen bonds constantly break and re-form, what would happen to aquatic life if solid water sank? c. i. Ice floats in liquid water because hydrogen bonds in ice are more. Water reaches its greatest density at 4 degrees celsius c. iii. If ice sank, all bodies of water would eventually freeze solid, making life impossible on earth. Amazing property iv: water is an excellent solvent: hydration of nacl: a crystal of salt dissolving in water: a. i. The collective pull" of hydrogen bonds pulls apart a relatively weak.

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