MCB 450 1st Edition Lecture 2 Outline of Last Lecture I The Unity of Biochemistry II Carbon Compounds Stereochemistry III Functional Groups IV Types of Biological Molecules V Central Dogma VI Domains of Life Cellular Organization Outline of Current Lecture I Properties of Water II Brownian Thermal Motion III Hydrogen Bonds IV Hydrophilic Hydrophobic Amphipathic Molecules V Weak Non Covalent Interactions VI Acid Base Chemistry pH VII Buffers and Titration Curves Current Lecture Water Universal solvent Chemical reactions that occur that we will talk about occur in water Properties of Water The melting point and boiling point of water indicates that there are many intermolecular forces in water Water has high heat capacity The water molecule is dipolar Hydrogen bond between slight negative on oxygen atom and slight positive on hydrogen atom Hydrogen Bonds LONGER and WEAKER than covalent bonds Intra between atoms H bonding in liquid water These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Only forms crystal lattice completely ordered if it is ice Brownian Motion Brownian motion atoms jiggle around determined by temperature o At higher temperatures atoms will move faster o Allows molecules to interact with each other Solvent Properties of Water Clathrate like a cage Relationship between Ka and pH a key equation Memorize henderson hasselbach equation Definition of pKa 1 2 ionic group titrated half group protonated half deprotonated Titration curve for phosphoric acid polyprotic acid Sometimes used for exam questions
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