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1. Which of the following electron transitions corresponds to emission of the longest wavelength light?
A. from n = 3 to n = 2 B. from n = 1 to n = 5 C. from n = 4 to n = 2 D. from n = 1 to n = 2 E. from n = 5 to n = 1
2. Emission from an excited Hg atom emits at 254 nm. What is the frequency of this light?
A: 1.18e15 sec-1B: 1.18e15 secC: 1.18e6 sec-1D: 1.18e6 sec
One mole of Nitrogen at 25 C and 1 bar is expanded reversibly and isothermally to a pressure of 0.132 bar. (a) How much work w is done on the gas? (b) How much work is done on the gas if it is expanded against constant pressure of 0.132 bar
Mole fraction of MgCl2 in an aqueous solution prepared by dissolving .400 moles of MgCl2 in 850g of water
In an electrolysis cell similar to the one employed in this experiment, a student observed that his unknown metal anode lost 0.238 g while a total volume of 84.90 mL of H2 was being produced
Calculate the pH of a solution that is 0.50 M in HF (Ka= 7.2 x 10-4) and 0.60 M in NaF. The answer is 3.22. Please show me how to get the correct answer.
How many H+ ions are required when the equation below is balanced in acidic solution with the smallest whole number coefficients? Cu(s) + NO3-(aq) => Cu2+(aq) + NO(g)
It takes 49.0 J to raise the temperature of an 11.7 g piece of unknown metal from 13.0 C to 24.0 C. What is the specific heat for the metal?
Can someone continue on what I already have please. Water cannot be used as a solvent for the Diels-Alder reaction between maleic anhydride and 1,3-cyclopentadiene because
The density of silver is 10.5g/cm3 what is the volume im cm 3 of an ingot of silver with mass 0.743 kg. If this sample of silver is a cube how long in each edge in cm
In terms of uncertainty, why is an endpoint volume of 9 mL less preferred than an endpoint volume of 35 mL? In terms of uncertainty, why is an endpoint volume of 55 mL less preferred than a volume of 35 mL?
Remember that M1V1=M2V2. What volume of distilled water do you need to add to dilute 10 mL of a 100 mM Tris- HCl buffer solution to a concentration of 10 mM
The temperature of the calorimeter increased from 24.5oC to 26.7oC. If the heat capacity of the calorimeter is 4.46 kJ (oC)-1, then what is the constant volume heat of combustion of this compound, in kilojoules per mole? (Remember to include a "+"..
Using Heisenberg's uncertainty principle, calculate the uncertainty in the position of a proton moving at a speed of 4.70 +- .01*10^4.
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