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Question: Show that some of the "Balmer-series" lines of singly ionized helium are the same as lines of the hydrogen Lyman series. Which ones are they, in general? This correspondence was a source of confusion when spectral lines of He ions were first observed in the solar spectrum; some people speculated that they were seeing a new form of hydrogen not found on Earth.
Which value is closest to the pOH of a 0.30M solution of the weak base methylamine (CH_3_NH_2_). The Ka for the acid form of methylamine (CH_3_NH_3_+) is 2.27E-11.
Would the ortho: para ratio of nitration of chlorobezene be less than, equal to, or greater than the 38:62 ratio observed with the nitration of bromobenzene. Why.
For multi-electron atoms (which is any atom except for hydrogen), how are the various orbitals filled? What is the electron configuration for nitrogen? What is the electron configuration for chlorine? What is the electron configuration for iron?
Which method is best at transferring heat from the fluid to the eggshell? Compare the temperature gradients you observed in the two methods.
A cook wants to heat 1.75 of water from 26.0 to 100.0 If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produces 49.3 of heat per gram.
a briefly review the logic that turns the observation that the absolute zero of temperature is unattainable into the
A 5.95-g sample of AgNO3 is reacted with BaCl2 according to the equation to give 3.21 g of AgCl. What is the percent yield of AgCl? AgNO3(aq) + BaCl2(aq) --> AgCl(s) + Ba(NO3)2(aq)
Which provides better protection once more corrosion painting a metal or galvanizing a metal
How many grams of HCl are in a quart of muriatic acid? The muriatic acid density is 1.18 g/mL and is typically 36.5% HCl by mass.
Fluorine reacts with oxygen to yield oxygen difluoride. 2 F2(g) + O2(g) 2 OF2(g) What is the value of K if the following concentrations are found at equilibrium: [O2] = 0.200 mol/L, [F2] = 0.0100 mol/L, and [OF2] = 0.0633 mol/L.
an aq cacl2 solution has a vapor pressure of 81.6mmhg at 50 degrees c. the vapor pressure of pure water at this temp is
What is the free energy cost of pumping calcium ions out of a cell when the cytoplasmic concentration is 0.4 uM, the extracellular concentration is 1.5 mM, and the membrane potential is -60 mV?
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