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Lecture%203 - First problem set BILD1 The Cell Prof Lisa M...

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1 BILD1 The Cell Prof. Lisa M. Boulanger 01/6/07 BILD1 - Lecture 3 2 First problem set Will be discussed in Sections THIS WEEK Key posted Saturday Problem set 2 posted Friday ! 01/6/07 BILD1 - Lecture 3 3 Highlights from the previous lecture: Ions are charged and soluble in water, due to ability to form hydrogen bonds Ionic bonds occur between ions (charged atoms) pH = -log[H + ]; acids increase [H + ] van der Waals bonds occur between transiently charged regions of molecules 01/6/07 BILD1 - Lecture 3 4 pH recap (-log 10 [H+]) + (-log 10 [OH-]) = 14 If 10 -3 M H + : (-log 10 [10 -3 ]) + (-log 10 [OH-]) = 14 (-[-3]) + (-log 10 [OH-]) = 14 3 + (-log 10 [OH-]) = 14 [OH-] = 10 -9 01/6/07 BILD1 - Lecture 3 5 4 emergent properties of water: cohesion (H bonds), moderation of temperature (high specific heat), ice floats (H bonds), versatile solvent (H bonds) Molarity of a solution daltons/molecule = grams/mole 1 mole/liter = 1 molar Some chemical reactions can reverse More highlights from the previous lecture: 01/6/07 BILD1 - Lecture 3 6 THIS LECTURE: Determinants and effects of molecular shape Functional groups Carbon: the backbone of biology Building and unbuilding bigger (macro) molecules
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