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What is the purpose of a hot filtration in a recrystallization? When would a hot filtration step not be necessary or useful in a purification by recrystallization? What experimental observation of the hot solution would let you know that it was not needed?
Iodine-131 is used in the form of sodium iodide to treat thyroid cancer. The isotope has a 1/2 life of 8.05 days
If the speed limit is 75 mph, could the driver of the car reasonably evade a speeding ticket by invoking the Heisenberg uncertainty principle?
how many moles of Ba(OH)2 are present in 165ml of 0.600M Ba(OH)2.
A common piece of laboratory glassware is a 125 mL beaker. What is this volume in the English system of units? [1 quart = 946. liter = 32 fl oz]
How many moles of PCl_5 can be produced from 21.0 g of P_4 and excess Cl_2?
calculate the molar heat of combustion of liquid methanol . a. -8.17 x 105 kJ/mol b. -817 kJ/mol c. 1.88 kJ/mol d. -0.8 kJ/mol e. none of the above
Rutherford result also showed that the most of the atom's mass is located in the nucleus which has a very small volume.
The Ksp of AgCl at 25 oC is 1.6 x 10-10. Consider a solution that is 1.0 x 10-4 M NaCl and 1.0 x 10-6 M AgNO3. 1. The solution is saturated.
Find deltaH for the combustion of ethanol (C2H6O) to carbon dioxide and liquid water from the following data. The heat capacity of the bomb calorimeter
The lab is synthesis of Methyl Red. The question is that diazonium salts cople with phenols in slightly alkaline solution. What effect does the PH of the solution have on reactivity of the phenol
Multiple choice questions in nuclear chemistry - which equation represents the balanced nuclear equation
The density of a gaseous compound was found to be 1.23 g L-1 at 330 K and 25.5 kPa. What is the molar mass of the compound?
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