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A student placed in an unknown sample plate thin layer chromatography and develops in dichloromethane as solvent. only there is a spot whose Rf is 0.95. This indicates that the unknown material is a pure compound? Not be a pure compound, suggest an alternate procedure to verify the purity of the sample
Which term or terms could be used to describe this sample of gold? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
Caffeine, C8H10N4O2, is a stimulant found in tea and coffee. A sample of the substance was dissolved in 41.5 g of chloroform, CHCl3, to give a 0.0940 m solution.
Determine the mechanism for the synthesis of p-nitroacetanilide from acetanilide and HNO 3 , nitric acid and H 2 SO 4 sulfuric acid?
A 32.65-g sample of a solid is placed in a flask. Liquid toluene, in which the solid is insoluble, is added to the flask so that the total volume of solid and liquid together is 50.00 ml.
A helium balloon at a high altitude has 2.1 × 104 L of helium at 0.40 atm and -13°C. If the balloon descends to an altitude in which the atmospheric pressure is 1.00 atm and the temperature is 20°C.
A 68-kg person exposed to thorium-234 receives 5.0x10^4 B particles, each with an energy of 3.0x10^-14 J. How many rads does the person receive?
standard-state free energy of formation data to calculate the acid-dissociation equilibrium constant
A piece of metal of mass 20 g at 99?C is placed in a calorimeter containing 55.8 g of water at 23?C. The final temperature of the mixture is 30.4?C.
the freezing point of pure camphor is 178.4 degrees C, and its molal freezing-point constant, Kf, is 40.0 degrees C/m. Find the freezing-point of a solution containing 3.00 g of a compound (molar mass=125 g/mol) dissolved in 45.0 g of camphor
At 0.0 C, if the volume of air is 2 mL and the pressure of the atmosphere that day is 665 mmHg, what is the number of moles of air?
Using the technique of the previous problem ?E was found to be -2,000.00 kJ/mol at 298 K for an unknown liquid hydrocarbon. In another experiment it was determined that for each mole of hydrocarbon
Write the nuclear equation for the alpha decay ( production of radioactive decay that may be considered radioactive waste products by the useful production of nuclear energy ) of each nuclide that are products of a nuclear power plant Rn-222, T..
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