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A ground state H-atom absorbs a photon of wavelength 94.38 nm, and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 3174 nm to reach an intermediate level, and a second to reach the ground state. What was the wavelength of the second photon emitted?
how much of the CaCl2 can be prepared from 385g of an ore containing Ca(OH)2 if the ore is 78.4% Ca(OH)2 by mass? Use the equation: 2 NH4Cl + 1 Ca(OH)2 --> 2 HN3 + 1 CaCl2 + 2 H20
Tablets from a bottle of commercial aspirin gave a negative test with FeCl3. Several months later, tablets from the same bottle gave a positive test with FeCl3. How do you account for this result? Why?
A sample of fresh grapefruit juice was filtered and titrated with the above I2 solution. A 100 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch endpoint.
zinc has a standard reduction potential of -1.36 v for zn(oh)4 2- +2e- yields zn+4oh-. find the formation constant for zn2+ +4oh- yields zn(oh)4 2-
what elutes from the column when etc. Why do you think you use extraction techniques instead of chromatography?
aspartame c14h18n2o5 is a solid used as an artificial sweetener. its combustion produces carbon dioxide gas liquid
How many different tripeptides can be made from two molecules of glycine and one molecule of histidine
Which of the following signs on q and w represent ( work is done on the systemby gaining heat from the surrounding) ? a- q=+, w=- b- q=-, w=+ c- q= + ,w=+ d- q=- , w= -
Assuming the turbine is well insulated, what is the maximum power that can be generated by the turbine?
tinii fluoride is often added to toothpaste as an ingredient to prevent tooth decay. what mass of fluoride in grams is
(1. According to the equation shown below, how many grams of oxygen are required to react with 9.0 grams of C2H6? 2 C2H6 + 7 O2 ---> 4 CO2 + 6 H2O (2. If 3.00 grams of calcium are allowed to react with 2.00 grams of fluorine, what mass of CaF2 would ..
given the reaction ca 2h2o caoh2 h2what is the total number of moles of ca needed to react completely with 4.0 moles
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