5) KCl has an attractive energy, EA=-1.436^*r^-1, and a repulsive energy, ER, of 5.86^* 10^-6r^-

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5) KCl has an attractive energy, \( \mathrm{E}_{\mathrm{A}}=-1.436^{} \mathrm{r}^{-1} \), and a repulsive energy, \( \mathrm{E}_{\mathrm{R}} \), of \( 5.86^{} 10^{-6} \mathrm{r}^{-9} \), where \( r \) is the bond distance (the distance between the ions) in nanometers ( nm ). a) Compute the net energy between the potassium and chlorine ions, \( \mathrm{E}_{\mathrm{N}} \). b) Using Excel, plot the attractive, repulsive, and net energies on the same plot. Scale the plot from \( 0.2-1.0 \mathrm{~nm} \) on the x -axis and -8 to \( 5 \mathrm{eV} / \mathrm{ion} \) pair on the y -axis. Determine the equilibrium bond distance, \( \mathrm{r}_{0} \), and the bond energy, \( \mathrm{E}_{0} \), from the minimum net energy. c) Use derivative calculus to find the equilibrium bond distance, \( \mathrm{r}_{0} \), and the bond energy, \( \mathrm{E}_{0} \), from the minimum net energy. 6) A) List the differences in properties between graphite and diamond, two forms of carbon. B) Use molecular orbital diagrams to explain the differences between graphite and diamond. 7) A) Sketch band diagrams for metals, semiconductors, and insulators. B) Explain why the electrical conductivities of metals go down with increasing temperature, whereas the electrical conductivities of semiconductors and insulators go up with increasing temperature.

          5) KCl has an attractive energy, \( \mathrm{E}_{\mathrm{A}}=-1.436^{*} \mathrm{r}^{-1} \), and a repulsive energy, \( \mathrm{E}_{\mathrm{R}} \), of \( 5.86^{*} 10^{-6} \mathrm{r}^{-9} \), where \( r \) is the bond distance (the distance between the ions) in nanometers ( nm ).
a) Compute the net energy between the potassium and chlorine ions, \( \mathrm{E}_{\mathrm{N}} \).
b) Using Excel, plot the attractive, repulsive, and net energies on the same plot. Scale the plot from \( 0.2-1.0 \mathrm{~nm} \) on the x -axis and -8 to \( 5 \mathrm{eV} / \mathrm{ion} \) pair on the y -axis. Determine the equilibrium bond distance, \( \mathrm{r}_{0} \), and the bond energy, \( \mathrm{E}_{0} \), from the minimum net energy.
c) Use derivative calculus to find the equilibrium bond distance, \( \mathrm{r}_{0} \), and the bond energy, \( \mathrm{E}_{0} \), from the minimum net energy.
6) A) List the differences in properties between graphite and diamond, two forms of carbon.
B) Use molecular orbital diagrams to explain the differences between graphite and diamond.
7) A) Sketch band diagrams for metals, semiconductors, and insulators.
B) Explain why the electrical conductivities of metals go down with increasing temperature, whereas the electrical conductivities of semiconductors and insulators go up with increasing temperature.

5) KCl has an attractive energy, EA=-1.436^*r^-1, and a repulsive energy, ER, of 5.86^* 10^-6r^-9, where r is the bond distance (the distance between the ions) in nanometers ( nm ).
a) Compute the net energy between the potassium and chlorine ions, EN.
b) Using Excel, plot the attractive, repulsive, and net energies on the same plot. Scale the plot from 0.2-1.0 nm on the x -axis and -8 to 5 eV / ion pair on the y -axis. Determine the equilibrium bond distance, r0, and the bond energy, E0, from the minimum net energy.
c) Use derivative calculus to find the equilibrium bond distance, r0, and the bond energy, E0, from the minimum net energy.
6) A) List the differences in properties between graphite and diamond, two forms of carbon.
B) Use molecular orbital diagrams to explain the differences between graphite and diamond.
7) A) Sketch band diagrams for metals, semiconductors, and insulators.
B) Explain why the electrical conductivities of metals go down with increasing temperature, whereas the electrical conductivities of semiconductors and insulators go up with increasing temperature.

Added by Sam C.

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