CEM 141 Recitation Week 3 Questions and Answers Already Passed

CEM 141 Recitation Week 3 Questions and Answers Already Passed as atoms get closer together and their e- clouds overlap, why does PE rise? the electrostatic repulsion between e- means that the atoms are forced apart, since energy was used to "push" e- together (in the form of KE) this energy must be stored in the electrostatic field as PE what forces are present/respective strengths at potential minimum? the strength of the attractive forces = the strength of repulsive forces (allows stable interaction to occur) what info does the depth of the potential well tell you about the strength of the interaction? the deeper the well, the more energy needed to separate the atoms (deeper well = stronger interaction) what info can you get from the position of the potential minimum along the x-axis (distance between atomic nuclei)? you can determine the distance between the nuclei when atoms are most stable why is the potential energy well deeper for Xe rather than Ne? Xe has more e-, so it has stronger LDFs why does the potential well for Xe have a longer distance between nuclei than Ne? Xe is a bigger atom (more e- = larger e- cloud) why do you need to add energy to change a solid to a liquid? we have to add energy so the forces holding the atoms in place are overcome and atoms can move relative to eachother what is the relationship between strength of an interaction and boiling point? the stronger attraction between particles the more energy is needed to overcome the attraction explain the relative melting points of Ne and Xe Xe has a higher melting point (and BP) than Ne bc it has stronger LDFs due to larger distortion of larger e- clouds around each Xe, bc of this Xe atoms are more attracted to each other so