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UNC-Chapel Hill CHEM 480 - Fundamentals
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CHEM 480 1nd Edition Lecture 1 Outline of Last Lecture I. N/AOutline of Current Lecture I. BondingII. Structure of Biological MoleculesIII. UnitsIV. EquilibriumV. Extensive vs. Intensive PropertiesVI. Equations of State VII. Standards Current LectureI. Bondinga. Ionic: electrostatic interactions e.g. NaCli. E = kQ+Q- / d ii. Inversely proportional to distanceiii. Directly proportional to chargeb. Covalent: intramolecular interactions e.g. HCl c. Intermolecular interactions:i. Hydrogen bonding (HF, HN, OH)ii. Van der Waals: dispersion forces, dipole-dipoleiii. Ion-dipole: e.g. Na+ n H2OII. Structure of Biological Moleculesa. Primary structure of a macromolecule is the sequence of units; e.g., order of amino acids in a polypeptide chain (largest)b. Secondary structure refers to the local spatial arrangement of the chain; e.g., helicalc. Tertiary structure is the overall 3D structured. Quaternary structure is the manner in which smaller molecules aggregate together (smallest)III. Unitsa. Mass = kgb. Distance = mc. Volume = m3These 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.d. Amount = mole. Charge = Cf. Time = sg. Pressure = Force / area in Pascalsi. 1 Pascal = 1 N/m2ii. 1 bar = 105 Paiii. 1 atm = 101325 Pah. R constanti. R = 0.08206 L*atm/mol*Kii. R = 62.36 L*torr/mol*KIV. Equilibriuma. Mechanicali.b. Thermali. Temperature (Kelvin) = property that determines direction in which energy will flow when two objects are in contact with each otherV. Extensive vs. Intensive Propertiesa. Intensive: independent of amounti. Temperatureii. Molar massiii. Densityb. Extensive: depends on amount of samplei. Massii. Volumeiii. Molesiv. Heat content, HVI. Equations of State a. Relates the variables that describe a state of a system to each otherb. PV = nRTi. Also a limiting law – becomes more accurate as P => 0VII. Standardsa. STP: 0C, 1 atmb. SATP: 298.15 K, 1


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UNC-Chapel Hill CHEM 480 - Fundamentals

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