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Determine the kinetic energy of the emitted electrons when cesium is exposed to UV rays of frequency = 1.3 x 10^15 Hz? Express your answer in Joules
Assume the water in your home has a typical concentration of 3.6 x10-3 M (Ca+2, Calcium Ino) and 1.0x10-3 M (Magnesium Ion Mg+2). Determine how many grams of Sodium Carbonate are needed to completely precipitate all of the Calcium and Magnesium ions If your washing machine used 20.1 gallons of water?
an 18-karat gold necklace is 75 gold by mass 16 silver and 9.0 copper. how many grams of copper are in the necklace? if
Therefore, a more systematic manner of indicating stereochemistry in these systems has been developed that uses the E and Z nomenclature system.
Propose hydrogen bonding patterns that will explain how either U or C in a codon 3'-terminal position could wobble with G at the 5' terminal of an anticodon (structural diagrams are required). Which hydrogen bonded pair will be the more stable? Wh..
A 20 mg sample of zinc is heated at 10 K min-1, and the peak on the DSC trace has an area of 0.371 W K. Calculate the latent heat of melting of zinc (in kJ mol-1)?
A mixture of sand and iron pieces weighs 53.29 g. Using a magnet, the iron is removed and weighs 15.63 g. What is the percent composition of sand in the mixture?
How many milliliters of O2 gas at 25 C and 1.00 atm pressure are obtained by the thermal decomposition of 0.470g of KMnO4? The balanced equation for the reaction is:
what is the molarity of phosphoric acid in a solution that is 84% by mass phosphoric acid and has a density of 1.87 g/ml?
A solution composed of 50% ethanol (EtOH), 10% methanol (MeOH), and 40% water (H2O) is fed at the rate of 100 kg/hr into a separator that produces one stream
A solution gave a precipitate when ammonium oxalate was added but gave no precipitate when ammonium sulfate was added. For each Magnesium group ion(Barium, Magnesium, Strontium, and Calcium) tell whether the ion
A 0.338-g same of anhydrous sodium carbone, Na2CO3, is dissolved in water and titrated to a methyl orange endpoint with 15.33 mL of a prepared hydrochloric acid solution. What is the molar concentration of the HCl solution
a 14.0 g sample of cacl2 is dissolved in 121 g of water with both substances at 25.0degc. calculate the final
the heat of fusion of a compound is 126 joules per gram. What is the total number of joules of heat that must be absorbed by 15.0- grams sample to change he compound from solid to liquid at its melting point?
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