Absorption spectrum and an emission spectrum
Distinguish between an absorption spectrum and an emission spectrum. With which did Bohr work?
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A mixture of CaCO3 and CaO weighing 0.665 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.500 g. Assuming all the CaCO3 broke down to CaO and CO2, calculate the mass percent of CaCO3 in the original mixture.
XYZ Corporation is a manufacturer of widgets. Over the past several months, it has been selling its widgets for $100 each and unit sales have averaged 5,000 units per month. This month its competitor, ABC, Inc. raised the price of its widgets
A graduated cylinder contains 129 of water. A 17.0 piece of iron (density = 7.86 ) and a 21.0 piece of lead are added. What is the new water level in the cylinder?
A current source of 12 cos 2000t A, a 200-ohm resistor, and a 0.2-H inductor are in parallel. Assume steady-state conditions exist. At t = 1 ms, find the power being absorbed by the (a) resistor; (b) inductor; (c) sinusoidal source.
How many grams of dry NH_4Cl need to be added to 1.60 L of a 0.800 it M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.99? Kb for ammonia is 1.8*10^{-5}.
What is the main overall driving force for any spontaneous reaction or change?
What is the expected freezing point of a 0.50 m solution of Li2SO4 in water? Kf for water is 1.86°C/m.
A very dilute solution contains 116 mg of fructose (M=180.16 g/mol) in 1.00 liters of solution. It is placed in a semipermeable membrane bladder, which is then suspended by a support in some pure water. What osmotic pressure would develop across t
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