# 316 Chem Kinetics + Drug Stability Quiz

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2015-09-29 18:45

## Section

Question | Answer |
---|---|

Chemical kinetics | studies rates of chem reactions + details of reaction mechanism |

The variable of kinetics | time |

A + 2B --> 3P | -dCa/dt = -(1/2)dCb/dt = (1/3)dCp/dt |

Law of Mass Action | The rate of an elementary rxn is propotional to the conc of the reactants raised to the powers of their stoich coefficients, independent of other conc and rxns |

Zero Order | -dc/dt = k, k = M/s, |

First Order | -dc/dt = kc, k = 1/sec, |

Half-Life of First Order Reactions | t(1/2) = ln2/k |

Shelf-life | c = 0.9c0, t(90) = 0.105/k |

Second Order | -dc/dt = kc^2, k=1/(M/s), |

Half Life of Second Order Reactions | t(1/2) = 1/kc0 |

How to detrmine Reaction Order and Rate Constant | Integrated equations, Isolation/pseudo-order techniques, Initial rate method |

Integrated Equations | if rxn has reached sufficient extent, use equation, Order wrt time |

Isolation/Pseudo-order technique | have way more of one reactant than the other and ignore the second one, Order wrt concentration |

Initial Rate method | keep one reactant constant, vary starting conc of second reactant, detrmine initial rate at t=0 |

How to measure concentration | Titration, Gas chromatogarphy, Liquid chromatogaphy (HPLC), NMR, UV spectroscopy |

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