Principles of Modern Chemistry
8th Edition
ISBN: 9781305079113
Author: David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher: Cengage Learning
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Germanium (Ge) is a semiconductor with a bandgap of 2.2 eV. How could you dope Ge to make it a p-type semiconductor with a larger bandgap?
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It is impossible to dope Ge and have this result in a larger bandgap.
Dope the Ge with silicon (Si)
Dope the Ge with gallium (Ga)
Dope the Ge with phosphorus (P)
Which of the following semiconductors would you choose to have photons with the longest possible wavelengths be able to promote electrons to the semiconductor's conduction band?
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Si
Ge
InSb
CdS
Which of the following metals is the only one with all of its bands completely full?
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K
Na
Ca
Al
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- 2. Specify the solvent and reagent(s) required to carry out each of the following FGI. If two reagent sets must be used for the FGI, specify the solvent and reagent(s) for each reagent set. If a reaction cannot be carried out with reagents (sets) class, write NP (not possible) in the solvent box for reagent set #1. Use the letter abbreviation for each solvent; use a number abbreviation for reagent(s). Solvents: CH2Cl2 (A); Reagents: H₂O (B); CH3CO₂H (D) NaHCO3 (4); Hg(OAc)2 (5); HBr (1); R₂BH (6); H2SO4 (2); CH3OH (C); Br₂ (3); H₂O₂ / HO- (7); NaBH4 (8) Reagent Set #1 Reagent Set #2 FGI OH - α-α Br + enant Solvent Reagent(s) Solvent Reagent(s)arrow_forwardBased on concepts from Lecture 3-5, which of the following ionic compounds should be most soluble in water? Group of answer choices MgO BeO CaO BaOarrow_forwardFrom an energy standpoint, which two process - in the correct order - are involved in the dissolving of an ionic compound crystal? Group of answer choices Water coordination to the ions followed by sublimation into the gas phase Sublimation of the crystal into gas-phase ions followed by water coordination to the ions Ion dissociation from the crystal followed by water coordination to the ions Water coordination to the ions followed by ion dissociation from the crystalarrow_forward
- For which Group 2 metal (M), is this process the most exothermic? M2+(g) + O2−(g) + CO2(g) → MO(s) + CO2(g) Group of answer choices M = Sr M = Mg M = Ca M = Baarrow_forward2. Specify the solvent and reagent(s) required to carry out each of the following FGI. If two reagent sets must be used for the FGI, specify the solvent and reagent(s) for each reagent set. If a reaction cannot be carried out with reagents (sets) class, write NP (not possible) in the solvent box for reagent set #1. Use the letter abbreviation for each solvent; use a number abbreviation for reagent(s). Solvents: CH2Cl2 (A); H₂O (B); Reagents: HBr (1); H2SO4 (2); CH3OH (C); Br₂ (3); CH3CO₂H (D) NaHCO3 (4); Hg(OAc)2 (5); R₂BH (6); H₂O₂ / HO- (7); NaBH4 (8) Reagent Set #1 Reagent Set #2 FGI Solvent Reagent(s) Solvent Reagent(s) HO OHarrow_forwardFor which of the following ionic compounds would you expect the smallest difference between its theoretical and experimental lattice enthalpies? (You may assume these all have the same unit cell structure.) Electronegativities: Ca (1.0), Fe (1.8), Mg (1.2), O (3.5), S (2.5), Zn (1.6) Group of answer choices ZnO MgS CaO FeSarrow_forward
- In the Born-Haber cycle for KCl crystal formation, what enthalpy component must be divided by two? Group of answer choices KCl(s) enthalpy of formation Ionization energy for K(g) K(s) sublimation enthalpy Cl2 bond dissociation enthalpyarrow_forward2. Specify the solvent and reagent(s) required to carry out each of the following FGI. If two reagent sets must be used for the FGI, specify the solvent and reagent(s) for each reagent set. If a reaction cannot be carried out with reagents (sets) class, write NP (not possible) in the solvent box for reagent set #1. Use the letter abbreviation for each solvent; use a number abbreviation for reagent(s). Solvents: CH2Cl2 (A); H₂O (B); Reagents: HBr (1); R₂BH (6); H2SO4 (2); CH3OH (C); Br₂ (3); CH3CO₂H (D) NaHCO3 (4); Hg(OAc)2 (5); H₂O₂ / HO (7); NaBH4 (8) Reagent Set #1 Reagent Set #2 FGI хот Br Solvent Reagent(s) Solvent Reagent(s)arrow_forwardWhat is the correct chemical equation for the lattice formation reaction for CaBr2? Group of answer choices Ca2+(g) + 2 Br−(g) → CaBr2(s) ½ Ca2+(g) + Br−(g) → ½ CaBr2(s) Ca(s) + Br2(l) → CaBr2(s) Ca(s) + 2 Br−(g) → CaBr2(s)arrow_forward
- PLEASE ANSWER THE QUESTION!!!arrow_forward3. SYNTHESIS. Propose a sequence of synthetic steps (FGI) that convert the starting material (SM) into the Target molecule. For each FGI in your proposed synthesis, specify the reagents / conditions, and draw the product(s) of that FGI. DO NOT INCLUDE the FGI mxn in the answer you submit. If an FGI requires two reagent sets, specify the order in which the reagent sets are added, e.g., i) Hg(OAc)2 / H₂O; ii) NaBH4/MeOH. Indicate the stereochemistry (if any) of the products of each FGI. FGI 1. Me Starting Material Source of all carbons in the Target molecule (can use multiple copies) Me Me Target molecule + enantiomerarrow_forwardcurved arrows are used to illustate the flow of electrons. Using the provided starting and product structures, draw the curved electron-pushing arrows for the following reaction mechanism stepsarrow_forward
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