Análisis de datos experimentales, Ejercicios de Química

¡Descarga Análisis de datos experimentales y más Ejercicios en PDF de Química solo en Docsity! Tarea 1 — Cinética P3-4A (4a. Ed.) P3-64 The [requency of fireflies Mashing and the frequency of crickels chirping as a function of temperature follow, Source: Keith J. Luidler. “Unconventional applications of the Arrhenius law.” J. Chem. Educ.. 5, 343 (1972). Copyright (c) 1972, American Chemical Society. Reprinted by permission. For fireflies: | For crickels: TOO) 21.0 25.00 30.0 TOO 14,2 203 27.0 Flashesfmin 90 12.16 16,2 Chirpstmin s0 126 200 The running speed of ants and the flight speed of honeybees as a function of temperature are given below. Source: B. Heinrich, The llot-Blooded Insecis (Cambridge. MA: Harvard University Press. 1993). For ants: | For honeybees: | TEC) 10 20 30 38 TEC) V (cn/s) 0.5 2.34 65 V (cms) (a) What do the firefly and cricket have in common? What are their differences? (b) Whal is lhe velocity of the honeybee at 40?C? Al -5*C? (c) Nicolas wants to know if the bees, ants. crickets, and fireflies have anything in common. If so, what is 1? You may also do a pair-wise comparison. P3-78 (4a. Ed.) P3-9, P3-106 Activation Encrgy (a) The rule of thumb that (he rate of reaction doubles for a 10%C increase in cs temperature occurs only at a specific temperature for a given activation E y A encrey. Develop a relationship between the temperature and activation => : energy for which the rule of thumb holds. Neglect any variations in con- centrations. For Ea = 50 kcal/mol, over whal temperature range (T) = 7, + 10*C) is this rule of (thumb valid? (b) Write a paragraph explaining activation encrey, £, and how it affects the chemical reaction rate. Refer to Section 3.3 and especially the Professional Reference Shelf sections R3.1, R3.2, and R3.3 if necessary. The initial reaction rate for the elementary reaction 2A+B > 40 was measured as a function of temperature when the concentration of A was 2 M and that of B was 1.5 M. —ralmol/dm* - 5): 0.002 0.046 0.72 8.33 TU: 300 320 340 360 (a) What is the activation energy? (b) What is the frequency factor?