Chapter 12: Problem 43
Draw the structure of the monomer(s) employed to form each of the following polymers shown in Table \(12.5\) (a) polyvinyl chloride, (b) nylon 6,6, (c) polyethylene terephthalate.
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Chapter 12: Problem 43
Draw the structure of the monomer(s) employed to form each of the following polymers shown in Table \(12.5\) (a) polyvinyl chloride, (b) nylon 6,6, (c) polyethylene terephthalate.
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State whether each statement is true or false, and why. (a) Semiconductors have a larger band gap than insulators. (b) Doping a semiconductor makes it more conductive. (c) Metals have delocalized electrons. (d) Most metal oxides are insulators.
Look up the diameter of a silicon atom, in \(\AA\). The channel length in a Pentium 4 processor chip is \(65 \mathrm{~nm}\) long. How many silicon atoms does this correspond to?
Explain why "bands" may not be the most accurate description of bonding in a solid when the solid has nanoscale dimensions.
A sample of the superconducting oxide \(\mathrm{HgBa}_{2} \mathrm{Ca}_{2} \mathrm{Cu}_{3} \mathrm{O}_{8+x}\) is found to contain \(14.99 \%\) oxygen by mass. (a) Assuming that all other elements are present in the ratios represented by the formula, what is the value of \(x\) in the formula? (b) Which of the metallicelements in the compound is (are) most likely to have noninteger average charges? Explain your answer. (c) Which of the metallic ions in the substance is likely to have the largest ionic radius? Which will have the smallest?
In the superconducting ceramic \(\mathrm{YBa}_{2} \mathrm{Cu}_{3} \mathrm{O}_{7}\), what is the average oxidation state of copper, assuming that \(Y\) and Ba are in their expected oxidation states? Yttrium can be replaced with a rare-earth element such as La, and Ba can be replaced with other similar elements without fundamentally changing the superconducting properties of the material. However, general replacement of copper by any other element leads to a loss of superconductivity.In what respects is the electron configuration of copper different from that of the other two metallic elements in this compound?
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