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CEM 141 Recitation Week 3-Question with Correct Answers/ Verified
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CEM 141 Recitation Week 3-Question with Correct Answers/ Verified
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CEM 141 Recitation Week 3-Question with Correct Answers/Verified
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 -
✔️✔️as atoms get closer together and their e- clouds overlap, why does PE rise?
the strength of the attractive forces = the strength of repulsive forces (allows stable interaction to
occur) - ✔️✔️what forces are present/respective strengths at potential minimum?
the deeper the well, the more energy needed to separate the atoms (deeper well = stronger
interaction) - ✔️✔️what info does the depth of the potential well tell you about the strength of the
interaction?
you can determine the distance between the nuclei when atoms are most stable - ✔️✔️what info
can you get from the position of the potential minimum along the x-axis (distance between atomic
nuclei)?
Xe has more e-, so it has stronger LDFs - ✔️✔️why is the potential energy well deeper for Xe rather
than Ne?
Xe is a bigger atom (more e- = larger e- cloud) - ✔️✔️why does the potential well for Xe have a
longer distance between nuclei than Ne?
we have to add energy so the forces holding the atoms in place are overcome and atoms can move
relative to eachother - ✔️✔️why do you need to add energy to change a solid to a liquid?
the stronger attraction between particles the more energy is needed to overcome the attraction -
✔️✔️what is the relationship between strength of an interaction and boiling point?
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 they require
more energy (and a higher temp) so they can seperate - ✔️✔️explain the relative melting points of
Ne and Xe
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