C483 Exam 1 Questions and Correct Answers/ Latest Update / Already Graded

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C483 Exam 1 Questions and Correct
Answers/ Latest Update / Already
Graded
Solubility


Ans: depends on dielectric constant and polarity


like dissolves like




Residue


Ans: Monomers in a polymer




Free Energy


Ans: Energy Available to do work in a system or reaction




Enthalpy


Ans: total heat or energy of a system

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entropy


Ans: A measure of disorder or randomness.




intramolecular forces


Ans: Forces within molecules


H-Bonds


Dipole-Dipole


LDF


van der Waals




Hydrophobic Effect


Ans: Exclusion of nonpolar substances from an aqueous solution


Non-polar molecules do not interact wiht H2O




Amphipathic compounds

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Ans: Compounds with both hydrophobic and hydrophilic portions (ex.

phospholipids in cell membranes)




Auto-Ionizations


Ans: H2O "self-ionizes" in solution and "proton jumping" occurs where water

molecules can create a network in solution so that the "acid" is spread out

across the solution and all the water molecules are moving and

transferring protons around to create hydronium




pH


Ans: Concentration of hydrogen ions in a solution (-log [H+])




pKa


Ans: -log (concentration of products/ concentration of reactants)




pH of strong acid solutions

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Ans: strong acids completely dissociate in solution




amount and strength of acid affects pH change




little strong acid in


solution can sometimes change pH more than more weak acid in solution




Weak Acids


Ans: do not completely dissociate in solution


lower Ka and higher pKa




Henderson-Hasselbalch


Ans: pH = pKa + log[A-][HA]


A- = proton acceptor


HA = proton donor