Intro to biology week two of notes
Intro to biology week two of notes BIOL-L 105
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This 6 page Class Notes was uploaded by Katelyn Scott on Wednesday September 9, 2015. The Class Notes belongs to BIOL-L 105 at Indiana University taught by T.J. Sullivan in Summer 2015. Since its upload, it has received 22 views. For similar materials see Introduction to Biology in Biology at Indiana University.
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Date Created: 09/09/15
9914 19 Key concepts for Ch 2 lVariation in molecular bonds I Polarity lTraits of H20 Ch 2 Water and Carbon Acids and bases the Chemical Basis of Life quot39 What are l1v1ng thmgs made of Comparmg bonds 39 mom mm Ell lamaa hm no cow moms rm puul ml mom have M chugl ll 05f r r 539 8 LY I 11 Il39539f ll 11 331 4503 Na I H 339 H r mm Mamas Amn39anvl wquot i 9914 4 4 Boiling points Boiling points m lBoiling adding energy to a liquid as 2 H2 individual molecules gain energy they move apart liquid becomes a gas 18 m lGenerally boiling points are proportional 28 NZ to the molecular weight of the substance 32 Oz 002 sublimation 44 point 9914 9914 Boiling points Boiling points m m 2 HZ 2 HZ 252839Z c 18 2 18 2 28 N2 28 N2 49579 C 32 oz 32 02 18295 C 44 C02 rllit fa m 39185 C 44 C02 Zili ggatm 39185 C 9914 9914 9914 Boiling points Boiling pt C Molecular weight 15 20 25 30 35 40 45 50 9 9914 4 What should the boiling point of a molecule with the MW of 18 be round to nearest 5 Rank Responses 1 l 2 2 3 4 5 6 Other Values 240 200 Value Matches 0 Boiling points m 2 18 28 32 44 Hz 252839Z c H20 100 C NZ 49579 C 02 18295 c COZ sublimation point 39185 C 9914 53 How great is water lVery important for life 75 of average living cell IBecause water is polar it interacts with other polar molecules and charged molecules lWater is a great solvent Lots of substances can dissolve in it 9914 How great is water lVery important for life 75 of average living cell Hydrogen bonding a Water is polar b Hydrogen bonds form between water molecules IPolar molecules and ions can dissolve easily in water a Polar molecules and ions dissolve readily in water Salt in absence of water quot O olt f s GSJ 51 Salt dissolved in water Electrons are 5 IBecause water 1s polar 1t 1nteracts w1th pulled toward other polar molecules and charged me b b molecules H H a 6 5 lWater 1s a great solvent Lots of substances can dissolve in it 57 Hydrogen bonding Hydrogen bonding INonpolar molecules won t dissolve in water b Nonpolar molecules do not dissolve in water A 39 39 we a as p 75 5 7 3 39 139 pl 1quot 9 3391 v Y J 333 fetal View 9914 d Other consequences of hydrogen bonding I Adhesion interaction between water and a solid I Helps with moving water against gravity in trees bonding I Surface tension Hydrogen bonding helps water resist force Z Other consequences of hydrogen The basilisk lizard 9914 bonding I When water freezes it forms a crystal lattice I Ice is less dense than liquid water Other consequences of hydrogen a In ice water molecules form a crystal lattice 39Y Y Y 39 1 11 9914 H C US Other consequences of hydrogen bonding Ice layer Other consequences of hydrogen bonding I High heat capacity IWater can absorb or lose energy without changing temperature too much Helps maintain body temperature Affects climate H C 3 Ocean currents 1 x r M mommmm e39 uquot a madamx A 39 39 l39 cold l l I 391 capital 0m cry3h m Wu Wind WI uuen nllwullwc Alth H C j H Can you explain the following phenomena 1 Salt dissolves in water but gasoline does not 2 There is less variation between day and night temperatures at the beach relative to a point 50 miles inland 3 All mammals keep themselves cool by sweating or panting 9914