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16 Cards in this Set
- Front
- Back
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Elements
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unable to divide and still be the same thing
92% of average organisms consist of |
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atomic # =
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number of protons
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mass =
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p+n+e
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92% of an average organisms consists of
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Carbon, oxygen, hydrogen, calcium, nitrogen, phosphorus
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molecules
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2 or more atoms held together with chemical bonds (O2)
compound = diff atoms held together with chemical bonds |
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chemical bonds
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covalent
lonic hydrogen |
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covalent bonds
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strongest, most common, electrically neutral, shares electrongs (O to H in H2O)
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ionic
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loss or gain of electron from ions to form a stable compound (NaCl)
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Hydrogen
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weak, slightly polar and therefore attractive to other slightly polar molecules (H2O sticking to H2O)
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cohesion
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water molecules stick together because of hydrogen bonds
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surface tension
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resistance to being broken
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adhesion
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sticky to slightly charged surfaces
allows plants/trees to deliver water hundreds of feet away and defy gravity allows water in plasma to be returned to heart from big toe |
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water
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universal solvent for life
absorbs things in blood |
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Acids
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yields H+ ions in solutoin
weak = milk causes pain and tissue necrosis |
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Bases
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Yields OH- ions in solution
Strong = NaOH weak = blood, sweat delayed pain, longer contact and deeper tissue damage |
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pros of water
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lots of energy to heat up, more than most substances
human body/ animals can resist overheating lots of energy to evaporate hydrogen bonds in sweat break and releases heat and cool down organisms float as ice because it expands and bcomes less dense frost bite: freezing water inside cells and ice crystals puncture membrane leading to cell death and tissue death |
