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The minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ?0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 5.73 × 10^14 s-1.
With what kinetic energy will electrons be ejected when this metal is exposed to light with a wavelength of ? = 245 nm?
A compound is heated to produce gas whose molecular mass is to be determined. The gas is collected by displacing water in a water filled flask inverted in a trough of water
aqueous solution given the density of the glucose solution is 1.23 g/cm^3.
find the contour length (chain length) for a fully extended polythylene molecule that has a degree of polymerization of (n=45000),given that the length of c-c bond is 1.54 Ao.
Tuning proton affinity. The pKa of an acid depends part,y on its environment. Predict the effect of each of the following environmental changes on the pKa of a glutamic acid side change.
limestone is decomposed by heating to quicklime and carbon dioxide. Calculate how many grams of quicklime can be produced from 1.0 kg o limestone.
What are the p, V, and T values of the final state of the same perfect gas after an adiabatic expansion to a final pressure of 0.100bar that follows the gas law: PV^(5/3)=constant
How many grams of solid magnesium nitrate should be added to 5.0 g of solid sodium nitrate in a 500-mL volumetric flask in order to produce an aqueous 0.25 M solution of NO3
A 28.0-g sample of nitrogen gas combines completely with 6.0 of hydrogen gas to form ammonia. What is the mass of ammonia formed.
Imagine that you have a 6.50L gas tank and a 2.50L gas tank. You need to fill one tank with oxygen and the other with acetylene to use in conjunction with your welding torch.
When photons with a wavelength of 310. nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 × 105 m/s.
a balloon filled with helium gas has a volume of 762 mL at a pressure of 1atm. The balloon is released and reaches altitude of 6.5km, where the pressure is 0.5atm.
A particular Lake contains 10^10 liter of water. Due to acidification, the pH of the Lake is 5.00. It has been decided to add enough calcium carbonate to the lake to bring the pH to 6.00.
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