The terms lattice and unit cell are to be defined for a cell. Concept Introduction: Solids are the substances which have strong forces of attraction between their molecules. The atoms are tightly bound and cannot be compressed by pressure. These can be of two types: Amorphous and crystalline solids. Amorphous solids are formed when the molecules of atom are tightly coupled together such that they are fixed in their position. These do not have any fixed shape. Such solids are glass, polymers and gels. On the other hand, crystalline solids are defined as the type of solids in which the atoms or molecules occupy specific positions. These are rigid and compact in nature. These possess long range order and definite melting points. For example: sodium chloride, diamond etc..
The terms lattice and unit cell are to be defined for a cell. Concept Introduction: Solids are the substances which have strong forces of attraction between their molecules. The atoms are tightly bound and cannot be compressed by pressure. These can be of two types: Amorphous and crystalline solids. Amorphous solids are formed when the molecules of atom are tightly coupled together such that they are fixed in their position. These do not have any fixed shape. Such solids are glass, polymers and gels. On the other hand, crystalline solids are defined as the type of solids in which the atoms or molecules occupy specific positions. These are rigid and compact in nature. These possess long range order and definite melting points. For example: sodium chloride, diamond etc..
Solution Summary: The author explains that lattice and unit cell are to be defined for a cell.
Definition Definition Large and very high-molecular-weight substances that consist of hundreds to thousands of repeating units. Polymers are also known as macromolecules. Number-average-molecular weight is the measuring system for the polymers.
Chapter 11, Problem 76RQ
Interpretation Introduction
Interpretation:
The terms lattice and unit cell are to be defined for a cell.
Concept Introduction:
Solids are the substances which have strong forces of attraction between their molecules. The atoms are tightly bound and cannot be compressed by pressure. These can be of two types: Amorphous and crystalline solids.
Amorphous solids are formed when the molecules of atom are tightly coupled together such that they are fixed in their position. These do not have any fixed shape. Such solids are glass, polymers and gels.
On the other hand, crystalline solids are defined as the type of solids in which the atoms or molecules occupy specific positions. These are rigid and compact in nature. These possess long range order and definite melting points. For example: sodium chloride, diamond etc..
32. Consider a two-state system in which the low energy level is 300 J mol 1 and the higher energy
level is 800 J mol 1, and the temperature is 300 K. Find the population of each level. Hint: Pay attention
to your units.
A. What is the partition function for this system?
B. What are the populations of each level?
Now instead, consider a system with energy levels of 0 J mol
C. Now what is the partition function?
D. And what are the populations of the two levels?
E. Finally, repeat the second calculation at 500 K.
and 500 J mol 1 at 300 K.
F. What do you notice about the populations as you increase the temperature? At what temperature
would you expect the states to have equal populations?
30. We will derive the forms of the molecular partition functions for atoms and molecules shortly in
class, but the partition function that describes the translational and rotational motion of a homonuclear
diatomic molecule is given by
Itrans (V,T) =
=
2πmkBT
h²
V
grot (T)
4π²IKBT
h²
Where h is Planck's constant and I is molecular moment of inertia.
The overall partition function is qmolec Qtrans qrot.
Find the energy, enthalpy, entropy, and Helmholtz free energy for the translational and rotational
modes of 1 mole of oxygen molecules and 1 mole of iodine molecules at 50 K and at 300 K and with a
volume of 1 m³. Here is some useful data:
Moment of inertia:
I2 I 7.46 x 10-
45
kg m²
2
O2 I 1.91 x 101
-46
kg m²
K
for each reaction step.
Be sure to account for all bond-breaking and bond-making
steps.
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Problem 30 of 20
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Done
DELL
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