BIOL 1020 Lecture Notes - Lecture 2: Chemical Polarity, Hydrogen Bond, Surface Tension

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1020
• Professor: Michael P.Shaw

Document Summary

Lecture 2 the chemistry of life: 70% of most cells is water, life on earth evolved in water. Geometry of bonds methane leads to non-polarity / there are no net charges due to all cancelation of arrows. Properties of water: surface tension: water molecules have a higher attraction to each other than to the air, reason why the surface of late kind of creates a film kind of surface, raff spider walking on the water. Physical states of water: liquid, ice, gas/vapor: water molecule: more freely and flows around, gas molecule: single molecule wondering where everybody is gone (they spread away from each other as much as possible) Ice molecule: molecules starts to slow down still having hydrogen bond with each other: as temperature decreases, molecules slow down, h-bonding becomes more ordered, ice is more ordered than in liquid-water (less molecules for a given volume) Ice is solid, and has a larger volume (less dense)