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Why must all the lines in the hydrogen spectrum between 2500 A and 7000 A belong to the Balmer series?
Water and toluene are very good recrystallization solvents. Why is it not useful to use these solvents for a ‘quick' recrystallization?
the following reaction were found to be PA = 4.00 atm, PB = 8.40 atm, PC = 5.70 atm, and PD = 1.60 atm. What is the standard change in Gibbs free energy of this reaction at 25 °C.
What range of pH is suitable for this kind of buffer? Calculate the ratio of phosphoric acid to phosphate to gice you pH .= 6.8
Hydrochloric acid is added to zinc. How many mls of 0.500 M HCl are needed to react completely with 25.0 g of zinc metal
How do I find pressure exerted in the closed end of an apparatus if the atmospheric pressure is 720.0 torr and the height of the water column is 22.3 cm
What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 12.7 L of water to produce an antifreeze solution with a freezing point of -34.6°C? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.)
A large cylinder of He gas,such as that used to inflate balloons,has a volume of 25.0 L at 22 Celsius and 5.6 atm. how many moles of He are in such a cylinder ?
Based upon your experiences, suggest what would be the result if we heated a mixture of dichloromethane (bp 39-40 Celcius) and nappthalene (C10H8 with mp 80-82 degrees celcius and bp 218) to 60 degrees celcius
A 224mL sample of an aqueous solution contains 2.80% MgCl2 by mass. Exactly one-half of the magnesium ions are Mg?28, a beta emitter with a half-life of 21 hours
If 32.36 mL of 0.05984 M Cr2O72- is required to titrate 27.91 g plasma, what is the mass percent of alcohol in the blood?
How many potassium ions must a cell lose in order to produce a membrane potential of - 95 mV for potassium? How does this compare to the number of potassium ions within the cell
What is the molarity of Cl- in a solution made by mixing 37.5 mL of 0.100 M NaCl with 54.0 mL of 0.100 M KCl?
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