Biology Test chapter 2

Question	Answer
Polar Covalent bonds	One has stronger pull than the other - partial (+) partial (-) I.e. H-O
Nonpolar Covalent bonds	Equal pull
Covalent bonds	Sharing of electrons
Ionic bonds	Takes or gives electrons
Hydrogen bonds	Between partially positive HYDROGEN and partially negative OXYGEN or NITROGEN
Van der Waals forces	Small, transient attraction between slight opposite charges (geckos feet)
Hydrogen bonds create ...	Surface tension like bugs on water
High specific heat	-takes a lot of energy to disrupt hydrogen bonds -resists temperature changes -acts as thermal buffers (in organisms, and for the earth)
Evaporative cooling	Water molecules take large amounts of energy when it evaporates
Water is more/less dense as a solid, and how?	Less, because ice floats in water
Acids	Release H+ ions (0-6.9 = acidic)
Bases	Takes up H+ ions (7.1+ = basic)
Buffers and ph change	Resist ph change -by accept H+ ions when they're in excess and donate H+ when they are depleted.

Resource summary

	Created by Kimberlee Hernandez almost 8 years ago