Chapter 12: Problem 84
Indicate whether the following statement is true or false: For an addition polymerization, there are no by-products of the reaction (assuming 100\(\%\) yield).
Chapter 12: Problem 84
Indicate whether the following statement is true or false: For an addition polymerization, there are no by-products of the reaction (assuming 100\(\%\) yield).
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Get started for freeAn element crystallizes in a face-centered cubic lattice. The edge of the unit cell is 4.078\(\hat{A}\) , and the density of the crystal is 19.30 \(\mathrm{g} / \mathrm{cm}^{3} .\) Calculate the atomic weight of the element and identify the element.
Introduction of carbon into a metallic lattice generally results in a harder, less ductile substance with lower electrical and thermal conductivities. Explain why this might be so.
GaAs and GaP make solid solutions that have the same crystal structure as the parent materials, with As and Prandomly distributed throughout the crystal. GaP As \(_{1-x}\) exists for any value of \(x .\) If we assume that the band gap varies linearly with composition between \(x=0\) and \(x=1,\) estimate the band gap for GaP \(_{0.5} \mathrm{As}_{0.5}\) . (GaAs and GaP band gaps are 1.43 \(\mathrm{eV}\) and 2.26 \(\mathrm{eV}\) , respectively.) What wavelength of light does this correspond to?
The first LEDs were made from GaAs, which has a band gap of 1.43 eV. What wavelength of light would be emitted from an LED made from GaAs? What region of the electromagnetic spectrum does this light correspond to: ultraviolet, visible, or infrared?
Imagine the primitive cubic lattice. Now imagine pushing on top of it, straight down. Next, stretch another face by pulling it to the right. All angles remain \(90^{\circ} .\) What kind of primitive lattice have you made?
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