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A hydrogen atom in its ground state absorbs a UV photon at a wavelength of 93.8 nm. It then re-emits a photon as it relaxes to the n=2 energy level. (a) To what energy level was the electron initially excited? (b) What is the net energy absorbed or emitted by the atom (in units of eV) in the overall process
Have you observed that when you spill water over your skin on a hot day it will cool you down but if you spill vegetable oil in place of water it will not cool you down give explanation for this difference?
Chloroform has a molar mass of 119.4 g/mol and a density of 1.499 g/cm^3. Estimate the volume of the above mixture using this information.
Mercuric sulfide HgS is one of the least soluble salts known, with Ksp=1.6x10^-54 at 25 C. Calculate both the molar solubility and the solubility of HgS
A lump of copper is heated with 225 J of energy. Its temperature rises by 11.5 oC. How many grams does this lump weigh
the mass of component A is 2.47 g, component B is 1.12 g, and component C is 0.654 g; what is the percent composition of component A?
What can you conclude from a graph where the plot of ln p (pressure) versus t (time) is linear instead of curved? (for conversion of methyl isonitrile into acetonitrile)
what would happen to the molar mass of the solute if the thermometer used actually read 1.4 degrees Celsius too high?
what is the molar concentration of phosphate ion in a 2.5 m aqueous solution of phosphoric acid
Which of the following would be the best procedure for extracting acetaldehyde from an aqueous layer to the organic layer? a. Extracting the aqueous layer one time with 200 mL of the organic solvent.
A sample of 28 Mg decays initially at a rate of 53500 disintegrations per minute, but the decay rate falls to 10980 disintegrations per minute after 48.0 hours
A solution of water at 30 degrees Celsius is placed in a freezer at a constant temperature of -8 degrees Celsius. Calculate the entropy change of the system, surroundings, and the universe.
Three Introductory Chemistry students each measured 50.0 mL of 1.0 M NaOH into "double-walled" styrofoam cup calorimeters. Then, Sue added 50.0 mL of 1.1 M HCl to her NaOH solution
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