3. Determination of the Order of a Reaction from Experimental Data

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Kinetics : ArrheniusActEnergy (4 Variations)
The rate constant for the first-order dehydration of tert-butyl alcohol at 500^{o}C is 1.20 x 10^{ -4 } s^{ -1}. The rate constant for this process at 600^{o}C is 6.80 x 10 ^{ -3} s^{ -1}. Calculate the activation energy for this reaction in kJ/mol. (R = 8.314 J/mol K)

Using the graph below, calculate the rate constant for this reaction at 40.0^{o}C.

Kinetics |

Chemometrics

Kinetics : ArrheniusTemp (3 Variations)
The activation energy for the isomerization of cyclopropane to propene is 274 kJ/mol. By what factor does the rate of reaction increase as the temperature rises from 500^{o}C to 550^{o}C assuming all else remains constant? (R = 8.314 J/mol k)

Hint: This is asking for the ratio of rates which is proportional to the ratio of the rate constants, all else being equal.

J. Chem. Educ. 1999,76, 1578–1583John Andraos Corrections to the article A Streamlined Approach to Solving Simple and Complex Kinetic Systems Analytically. Andraos, John. J. Chem. Educ.2008, 85, 1624.

Kinetics |

Mechanisms of Reactions |

Theoretical Chemistry

Manual Data Processing in Analytical Chemistry: Linear CalibrationDora Melucci Most science students are familiar with Excel spreadsheets, but determining which of Excels statistical functions perform a calculation equivalent to a classical equation and calculating errors with Excel are not trivial exercises. Melucci, Dora. J. Chem. Educ.2008, 85, 1346.

Calibration |

Chemometrics |

Quantitative Analysis

Helping Students Make Sense of Logarithms and Logarithmic RelationshipsEd DePierro, Fred Garafalo, and Rick Toomey This paper summarizes difficulties that chemistry students at all levels exhibit when translating, manipulating, and interpreting mathematical expressions containing logarithms, and offers approaches useful in helping students to overcome those difficulties. DePierro, Ed; Garafalo, Fred; Toomey, Rick T. J. Chem. Educ.2008, 85, 1226.

Handling Large and Small NumbersEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.