Draw a rough energy band
In what type of material is the energy gap between the valence and the conduction band the greatest? Na, Ge or diamond. Draw a rough energy band showing the valence and conduction bands in these materials.
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Any help on how to do or start this problem. Calculate the change in pH of rainwater resulting from an increase in the P of CO2 from 10^-3.5 atm to 10^-3.0 atm due to fossil fuel emissions.
What type of solid (e.g., molecular or metallic) would you expect each of the following substances to form (and explain why): (i) HCOOH; (ii) CaF2; (iii) Xe; (iv) K; (v) SiC; (vi) NH4Cl; (vii) MgO.
Consider the following data showing the initial rate of a reaction (A------> products) at several different concentrations of A.
When a 0.133 g sample was studied by combustion analysis, 0.239 g of CO2 and 0.0323 g of H2O formed. How many moles of each of the following were in the original sample?
Show by writing appropriate chemical equation how each of the following conversions could be achieved: 2-hexyne from 1,1-dichlorobutane.
An aqueous solution contains metal cations Hg^+2 and Mn^+2 belonging to groups 2 and 3 respectively. Thioacetamide which produces H2S is added and the solution is buffered to a pH of 8 by addition of NH3/NH4Cl
Calculate the [SCN-] solution A, where 5.7 mL of 2.910?3 M NaSCN is diluted to 44.0 mL with 0.1 M Fe(NO3)3. Next calculate the [FeSCN2+] in the solutions prepared by diluting volumes of solution A with 0.1 M Fe(NO3)3 to a final volume of 1.0101 mL
Diazomethane has the following composition by mass: 28.57% C, 4.80% H, and 66.64% N. The molar mass of diazomethane is 42.04 g/mol. Find the molecular formula of diazomethane and draw its Lewis structure.
Any help on how to do or start this problem? Suppose the gas above the soda in a bottle of a soft drink is pure CO2 at a pressure of 2 atm. a. Estimate the pH of the soda. b. Calculate CT, the total dissolved inorganic carbon.
Compare in your mind 3 different liquids: pure ethanol, a 50% ethanol/water mixture and a 50 % ethanol/methanol mixture. Rank these three liquids in order of increasing Ptotal when each liquid is in equilibrium with its vapor at 25ºC.
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