As one might predict from a button called "lose energy", this resulted in a decrease in the total energy of the system of two He atoms. Remember that this molecule is part of the surroundings. In the box below, explain how the molecule participates in this decrease in total energy of the system of two He atoms. (Hint: at this atomic-molecular level, what actions are occurring?) Enter your answer here

As one might predict from a button called "lose energy", this resulted in a decrease in the total energy of the system of two He atoms. Remember that this molecule is part of the surroundings. In the box below, explain how the molecule participates in this decrease in total energy of the system of two He atoms. (Hint: at this atomic-molecular level, what actions are occurring?) Enter your answer here

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter9: Energy And Chemistry

Section: Chapter Questions

Problem 9.99PAE: 9.99 The chemical reaction BBr3(g)+BCl3(g)BBr2Cl(g)+BCl2Br(g) , has an enthalpy change very close to...

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9.99 The chemical reaction BBr3(g)+BCl3(g)BBr2Cl(g)+BCl2Br(g) , has an enthalpy change very close to zero. Using Lewis structures of the molecules, all of which have a central boron atom, provide a molecular-level description of why H for this reaction might be very small.
Does the standard enthalpy of formation of H2O(g) differ from H for the reaction 2H2(g)+O2(g)2H2O(g)?
The diagram below shows a system that is made up of 3 molecules (labeled A, B, and C) that contains a total of 4 units of energy. Assuming that no molecule can have 0 energy associated with it, and that only integral amounts of units of energy are allowed (energy = 1 or energy = 2 is allowed, but energy = 1.5 is not). In the left-most diagram, one possible way of distributing the four units of energy among these three molecules is presented. This distribution is represented as: (1, 1, 2). %3D 6 SEE 6 5 4 4 4 3 3 3 2 2 1 1 1 A B C AB C АВС (1, 1, 2) a. Show explicitly that a total of 4 units of energy are present in the left-most diagram. b. Explain why (1, 3, 0) is not an allowed distribution for this system. Show the other two allowed distributions of energy for this system using the two blank diagrams, and write the corresponding representation below each diagram. С.
what is meant by term state function?
Which of the following is incorrect? A. Energy can be converted from one form to another but cannot be created nordestroyed. B. The change in the internal energy of a system is given by the sum of the heat that flows across its boundaries and the work done on the system by the surroundings. C. Enthalpy is the state or condition wherein the temperatures of the elements in a system are of equal values. D. The internal energy of a system is composed of the kinetic energy and the potential energy.
(b) Construct a Born Haber cycle diagram for the formation of magnesium chloride and find the enthalpy atomization of magnesium. Given the followings: Enthalpy formation of magnesium chloride AH°r = -642 kJmol' Lattice energy of magnesium chloride AH° lattice = -2525.2 kJmol-' Enthalpy atomization of chlorine AH°, = 121.5 kJmol· First ionization energy of magnesium IEI = 737.7 kJmol Second ionization energy of magnesium IE2= 1450.7 kJmol Electron affinity of chlorine EA = -679.2 kJmol·!
(a) The ionization energy of potassium (K) is 4.34 eV and the electron affinity of chlorine (Cl) is -3.61 eV. The Madelung constant for the KCl structure is 1.748 and the distance between ions of opposite sign is 0.314 nm. On the basis of these data only, compute the cohesive energy of KCl per ion pair. (b) The observed cohesive energy of KCl is 6.42 eV per ion pair. On theassumption that the difference between this figure and that obtained in (a) is due to the exclusion principle repulsion, find the exponent n in the formula Br^-n for the potential energy arising from this source.
For the molecules HCN and CH3NH₂