Para responder a las primeras cuestiones de tipo test, vamos a usar una herramienta online: haced click AQUÍ para responder.
martes, 22 de mayo de 2018
miércoles, 16 de mayo de 2018
martes, 8 de mayo de 2018
viernes, 13 de abril de 2018
Cuestiones adicionales de equilibrio
1. PCl5(g) and Cl2(g) were placed in a sealed flask and allowed to reach equilibrium at 200 °C. The enthalpy change, ΔH, for the decomposition of PCl5(g) is positive.
a. Deduce the equilibrium constant expression, K , for the decomposition of PCl (g).
b. Deduce, giving a reason, the factor responsible for establishing the new equilibrium after 14 minutes.
2. The Contact process involves an exothermic reversible reaction:
a. Deduce the extent of the reaction at 200 °C and 1 atm.
b. The Contact process operates at a temperature of 450 °C and a pressure of 2 atm as optimum conditions for the production of SO3. Outline the reasons for choosing these conditions.
c. An engineer at a Contact process plant hypothesized that using pure oxygen, instead of air, would increase the profits. Comment on whether or not her hypothesis is valid, giving your reasons.
3. An equilibrium occurs between nitrogen dioxide, NO2, and dinitrogen tetroxide, N2O4.
a. Deduce the equilibrium constant expression, Kc, for this reaction.
b. Explain the effect on the position of the equilibrium and on the value of Kc when: i) pressure is decreased and temperature is kept constant; ii) temperature is increased and pressure is kept constant.
a. Deduce the equilibrium constant expression, K , for the decomposition of PCl (g).
b. Deduce, giving a reason, the factor responsible for establishing the new equilibrium after 14 minutes.
2. The Contact process involves an exothermic reversible reaction:
2SO2(g) + O2(g) ⇌ 2SO3(g) Kc>>1 at 200 °C and 1 atm
a. Deduce the extent of the reaction at 200 °C and 1 atm.
b. The Contact process operates at a temperature of 450 °C and a pressure of 2 atm as optimum conditions for the production of SO3. Outline the reasons for choosing these conditions.
c. An engineer at a Contact process plant hypothesized that using pure oxygen, instead of air, would increase the profits. Comment on whether or not her hypothesis is valid, giving your reasons.
3. An equilibrium occurs between nitrogen dioxide, NO2, and dinitrogen tetroxide, N2O4.
2 NO2 = N2O4
a. Deduce the equilibrium constant expression, Kc, for this reaction.
b. Explain the effect on the position of the equilibrium and on the value of Kc when: i) pressure is decreased and temperature is kept constant; ii) temperature is increased and pressure is kept constant.
jueves, 12 de abril de 2018
Fritz Haber y la síntesis del amoniaco
Durante la primera parte de la clase (unos 30 minutos), tendréis que investigar sobre Fritz Haber y el proceso de síntesis del amoniaco que lleva su nombre.
A modo de guía, deberíais buscar información sobre:
A modo de guía, deberíais buscar información sobre:
- el personaje, con sus luces y sus sombras
- la problemática de los fertilizantes antes de Haber
- el proceso Haber
- reacción
- condiciones óptimas
- consecuencias del descubrimiento
La información se volcará en padlet: https://padlet.com/victorj/f8wmlrmmgkur.
martes, 10 de abril de 2018
Cuestiones y problemas del IB del tema 7
En este ENLACE podéis descargaros algunas cuestiones de este tema.
martes, 3 de abril de 2018
Cuestiones y problemas del IB del tema 6
En este ENLACE podéis descargar una colección de cuestiones y problemas tipo IB de este tema.
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