Blog

Calculate the energy of a photon emitted by a hydrogen atom when the electron falls from the n=12 energy level to the n=5 energy level.

Calculate the frequency associated with violet light (405 nm)? 

Which of the following when mixed with sodium sulfate (Na2SO4) will produce a precipitant?  Pb(NO3)2 Zn(ClO3)2 CaCl2

Calculate the frequency associated with yellow light (575 nm)? 

For the following reaction 8.52 g of lithium is reacted with 7.67 g of nitrogen gas.  What is the theoretical yield of lithium nitride?  6 Li(s) + N2(g) 

What is the energy in joules of 4 moles of photons with a wavelength of 4.12 mm? 

Which statement is/are correct regarding an aqueous mixture of AgNO3 and HCl? i.  The net ionic equation would be:  Ag+ + Cl- ––> AgCl (s) ii.  Silver would be a spectator ion iii.  H+ would be a spectator ion

What is the molarity of acetate ions, C2H3O2–, if 2.15 g of calcium acetate, Ca(C2H3O2)2, is in a 250.0 mL solution? 

What is the energy in joules of 2 moles of photons with a wavelength of 5.62 mm? 

The prior probabilities for a loan are: p(s1) = 0.7 and p(s2) = 0.3, where s1 is repay and s2 is default. The decision alternatives are: d1 – make loan, and d2 – do not make loan. The payoff table is as follows: s1 s2 d1 10000 -20000 d2 6000 6000 The firm can acquire sample information in the form of a credit report that has three possible outcomes: high (H), medium (M), and low (L). The relevant conditional probabilities are: p(H | s1) = 0.60, p(M | s1) = 0.30, p(L | s1) = 0.10 p(H | s2) = 0.10, p(M | s2) = 0.10, p(L | s2) = 0.80 Compute the expected value of the sample information. Would it be worthwhile to pay $1000 for the report? Show all work.