If the rate increases so will the rate constant

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less time, making the rate greater. If the rate increases, so will the rate constant. Rearranging the Arrhenius equation for slope, we get -T(ln k – constant) = Ea/R, where T is temperature, k is the rate constant, Ea is the activation energy, and R is the gas constant. Ea/R represents the slope, which is dependent on the temperature and rate constant. Since tert-butyl bromide’s reaction rate is faster than tert-butyl chloride’s, tert- butyl bromide would have a greater rate constant. This increase in the rate values increases the magnitude of the slope, thus making the Arrhenius plot a steeper line. 8. Tertiary alkyl molecules can undergo elimination reactions while following an E2 mechanism in the presence of hydroxide, a strong base. Under the reaction conditions in this laboratory, however, the tertiary alkyl molecule is unlikely to undergo this elimination reaction. In this experiment, the tertiary alkyl, tert-butyl chloride, was used. It underwent an SN1 reaction with water to produce hydrochloric acid and tert-butanol. Water has a pKa of 15.7 and is therefore a weak base. Because water acts as a weak base, rather than a strong base, it is unlikely for the elimination reaction to go through. In addition, although this experiment did use hydroxide, it was in a low enough concentration that it did not react with the tertiary alkyl molecule. Instead, the hydroxide was used to neutralize the hydrochloric acid produced, allowing for reaction time to be measured more accurately. Lastly, the reaction between tert-butyl chloride and water was determined to be a first-order reaction. Since E2 reaction mechanisms involve a second order reaction, it becomes even less likely for the tert-butyl chloride to undergo an E2 mechanism elimination reaction.
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  • Fall '09
  • POTVIN
  • 20%, 40%, 30%, 5 m/s, 4 m/s

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