BSCI 105 Chapter Notes - Chapter 3: Hydrogen Bond, Surface Tension, Heat Capacity

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Water is 75% of earth- ice, vapor, water- all three physical states. Water- v shape molecularly- 2 hydrogens (slightly pos) covalently bonded to oxygen (more slightly neg) and electrons spend more time with oxygen (more electronegative)- so polar covalent. When in liquid form the bonds are super weak- so form break and. Cohesion of water molecules- water molecules stay close together because of hydrogen bonding. Cohesion- hydrogen bonds hold substance together: contributes to transport of water in plants, surface tension- measure how hard it is to break at the surface of a liquid. Clings to each other through hydrogen bonding at the surface and below surface (water can go a little higher than what cup can hold) Adhesion- clinging of one substance to another- water clings to other things. Water absorbs heat from air and release it to make it cooler, and it will change very slightly in its own temperature.

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