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The first 25 years of the twentieth century were momentous for the rapid pace of change in scientists' understanding of the nature of matter.
(a) How did Rutherford's experiments on the scattering of α particles by a gold foil set the stage for Bohr's theory of the hydrogen atom?
(b) In what ways is de Broglie's hypothesis, as it applies to electrons, consistent with J. J. Thomson's conclusion that the electron has mass? In what sense is it consistent with proposals preceding Thomson's work that the cathode rays are a wave phenomenon?
nicotine a component of tobacco is composed of c h and n. a 12.075 mg sample of nicotine was combusted producing 32.757
What is the molarity of a sodium hydroxide solution if 25.0 mL of this solution reacts exactly with 22.30 mL of .253 M sulfuric acid
Ethanol, C2H5OH, is mixed with gasoline and sold as gasohol. Calculate the grams of ethanol needed to provide 388kJ of heat.
What is the pH of a solution that is 0.75M in sodium acetate and 0.5M in acetic acid (Ka for acetic acid is 1.85 * 10^-5
what volume of hydrogen gas measured at stp would result from reacting 75.0g of sodiumnbsp hydroxide with 50.0g of
The Orsat analysis of the flue-gas gives 13.9% CO2, 0.8% CO, 4.3% O2, and 81.0% N2. Calculate the percent of excess air based on complete combustion of the coke.
n-butane vapor and liquid are in equilibrium (boiling) at 18.66 bars. Use the Peng-Robinson equation of state to determine the saturated liquid and saturated vapor molar volumes
An aqueous CaCl2 solution has a vapor pressure of 81.6 mmHg at 50 °C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent?
A photoelectron produced by ionization in a photoelectron spectrometer is ejected with a velocity of 861 km s-1. Calculate the de Broglie wavelength (in Ã) of the electron.
If the heat of combustion for a specific compound is -1210.0 kJ/mol and its molar mass is 46.97 g/mol, how many grams of this compound must you burn to release 107.00 kJ of heat
Finding out amt of sugar in sodas. If the soda unknown was set out thus the carbonation is lost. What would have been the effect of deter. Of densities if this hadn't been done? Would it affect accuracy or precision of density measured? Is it syst..
the three isomers 0-,m-, and p-xylenes are are very difficult to distinguish via proton NMR. However they are instantaneously distinguishable via carbon NMR how. What do you expect to see for each
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