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Many organic chemists when making a new solid compound often first try ethanol as a recrystallizing solvent. If soluable at room temperature, they simply add water and this often works! Why?
As indicated in the problem above, a mixture of ethanol and water is often used as a recrystallizing solvent, but not a mixture of benzene (C6H6) and water. Why not?
Write the simplest balanced equations, and find the actual relative masses of the elements. Explain your reasoning.
The radius of the Earth is approximately 6370 km. if one could dig down straight towards the center of the Earth, one would find that the innermost 3480 km (the core) has an average density of about 11.g/cm^3.
what is the total pressure in a canister that contains oxygen gas at a partial pressure of 804 mm Hg, nitrogen at a partial pressure of 220 mm Hg, and hydrogen at a partial pressure of 445 mm Hg.
Calculate the amount of heat liberated (in kJ) from 347 g of mercury when it cools from 85.0°C to 15.0°C.
What is the molality of a solution that contains 80.0 g Al2(SO4)3 in 625 g H2O?
What is the initial sulfur dioxide concentration (in mol/L or M)?
What is the wavelength of a photon of electromagnetic radiation having a photon energy of 4.56X10^-19 J? Report your answer in nanometers, to the correct number of significant figures.
What are the percentages of each molecular ion? (List to nearest 1% in order of increasing mass separated by commas, e.g. 55,45.)
What is the maximum amount of silver (in grams) that can be plated out of 4.8 {rm L} of an {rm{AgNO}}_3 solution containing 3.6 % {rm Ag} by mass? Assume that the density of the solution is 1.01.
What is the activation energy for the uncatalyzed reverse reaction?
Determine the amount of energy involved in calories given off when 85 grams of H2O cools from 45 degrees Celsius to 25 degrees Celsius?
before a plate is developed. What would happen if a plate were developed in a jar with an atmosphere not saturated with solvent vapor?
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