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Biology Test chapter 2

Kimberlee Hernandez Inglés 13 fichas

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1Polar Covalent bondsOne has stronger pull than the other
- partial (+) partial (-) I.e. H-O
2Nonpolar Covalent bondsEqual pull
3Covalent bondsSharing of electrons
4Ionic bondsTakes or gives electrons
5Hydrogen bondsBetween partially positive HYDROGEN and partially negative OXYGEN or NITROGEN
6Van der Waals forcesSmall, transient attraction between slight opposite charges (geckos feet)
7Hydrogen bonds create ...Surface tension like bugs on water
8High specific heat-takes a lot of energy to disrupt hydrogen bonds
-resists temperature changes
-acts as thermal buffers (in organisms, and for the earth)
9Evaporative coolingWater molecules take large amounts of energy when it evaporates
10Water is more/less dense as a solid, and how?Less, because ice floats in water
11AcidsRelease H+ ions
(0-6.9 = acidic)
12BasesTakes up H+ ions
(7.1+ = basic)
13Buffers and ph changeResist ph change
-by accept H+ ions when they're in excess and donate H+ when they are depleted.