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Show that cohesive energy is minimum at equilibrium separation?
Wiki User
∙ 12y ago
We have Lennard-Jones Potential given by,
U=4epsilon[{(sigma/R)^12}- {(sigma/R)^6}]
At equilibrium, dU/dR=0 if U is minimum.
Solving, we get U=-epsilon which is indeed the bottom of the potential well.
Wiki User
∙ 12y ago
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Why potential energy is minimum at equilibrium distance?
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Are lattice and cohesive energies same?
Lattice energy is energy required to separate ions to infinite distance with no more interaction. Cohesive energy is energy required to separate atoms to infinite distance with no more interaction.
What is the difference between phase equilibrium and metastability?
For the condition of phase equilibrium the free energy is a minimum, the system is completely stable meaning that over time the phase characteristics are constant. For metastability, the system is not at equilibrium, and there are very slight (and often imperceptible) changes of the phase characteristics with time.
What is cohesive energy of a molecule?
To calculate the cohesive energy, let us consider the general situation of two identical atoms. As the atoms approach, the attractive forces increases and potential energy decreases. At the equilibrium position the potential energy of either two atom is given by U= decrease in potential energy due to attraction + increase in potential energy due to repulsion. work done in moving through a small distance dr is given by du(r) + F(r)dr Hence the potential energy if the atom U(r)=int du(r) = int F(r)dr = int(A/rM - B/rN)dr
Is equilibrium point where the system has the highest free energy?
Equilibrium is complete balance among everything.
Why potential energy is minimum at equilibrium distance?
hjhjru7ry rtyh
How does disequilibrium occur?
Something is in "equilibrium" when it is in a state of perfect balance or rest. All forces acting on it are equal and opposite. It is in a "minimum" energy state.
Types of equilibrium?
In physics there are two common types of equilibrium: static equilibrium and neutral equilibrium. Equilibrium usually is related to potential energy, for a system to be at equilibrium it must maintain the balance between the two types of mechanical energy: potential and kinetic. The first equilibrium: static means that the system is in a relatively low (relatively means that there could be lower energy but the current states is a local minimum), thus small disturbances to the system will be returned to its original equilibrium. The other type of equilibrium is neutral equilibrium, the relative energies of the system is constant, thus disturbances to the system will move the system but it will remain at the same equilibrium value, and the system makes no effort to return to its original state. Please take a look at the graph for a visualization of these 2 types.
Are lattice and cohesive energies same?
Lattice energy is energy required to separate ions to infinite distance with no more interaction. Cohesive energy is energy required to separate atoms to infinite distance with no more interaction.
What is the difference between phase equilibrium and metastability?
For the condition of phase equilibrium the free energy is a minimum, the system is completely stable meaning that over time the phase characteristics are constant. For metastability, the system is not at equilibrium, and there are very slight (and often imperceptible) changes of the phase characteristics with time.
When has a solution reached equilibrium?
Something is in "equilibrium" when it is in a state of perfect balance or rest. All forces acting on it are equal and opposite. It is in a "minimum" energy state.
What is cohesive energy in case of NaCl?
If you think to lattice energy the value is 789 kJ/mol.
What is cohesive energy of a molecule?
To calculate the cohesive energy, let us consider the general situation of two identical atoms. As the atoms approach, the attractive forces increases and potential energy decreases. At the equilibrium position the potential energy of either two atom is given by U= decrease in potential energy due to attraction + increase in potential energy due to repulsion. work done in moving through a small distance dr is given by du(r) + F(r)dr Hence the potential energy if the atom U(r)=int du(r) = int F(r)dr = int(A/rM - B/rN)dr
Is equilibrium point where the system has the highest free energy?
Equilibrium is complete balance among everything.
Difference between thermal energy and mechanical energy?
Mechanical energy concentrates on an object as a whole, and thermal energy concentrates on an object's actions. Additionally, Thermal energy depends on temperature and mechanical energy depends on kinetic and potential energy.
What kind of energy does separation of charges create?
Static energy :]
What are the principles of equilibrium of force?
There has to be no force or energy between two objects to have equilibrium force. #kayleyjonas# age 10
