CEM 141 Recitation Exam Questions| Already answered| GRADED A+
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CEM 141 Recitation
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CEM 141 Recitation
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 -
ANSWER-as atoms get closer together and their e- clouds overlap, why does PE rise?
the stren...
CEM 141 Recitation Exam Questions|
Already answered| GRADED A+
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 -
ANSWER-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)
- ANSWER-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)
- ANSWER-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 - ANSWER-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 - ANSWER-why is the potential energy well deeper for Xe rather
than Ne?
Xe is a bigger atom (more e- = larger e- cloud) - ANSWER-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 - ANSWER-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 -
ANSWER-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 - ANSWER-explain the relative melting points of Ne and
Xe
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