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Of sublimation, recrystallization, distillation, and extraction, which purifications methods should be used to purify the following:
a) a crude solid mixture that is 90% pure
b) a solution of two compunds where one is solid and one is liquid
c) a mixture of two liquids that differ in acid/base functionality and differ in boiling point by 10 degrees
d) a compound that readily forms hydrates
The results of the experiment supported the hypothesis of semiconservative replication, which was proposed by Watson and Crick.
A solution is prepared by dissolving 159 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.)
A jogger runs at an average speed of 5.9 mi/h. a. How fast is she running in m/s? b. How many kilometers does she run in 98 min?
An organic compound has a molecular weight of 176.12 amu and was found to contain only three elements, C, H and O. When a 1.0000 g sample was completely combusted in air
Calculate the solubility of zinc hydroxide Zn(OH)2 in 1.10 M NaOH. Ksp=3.0x10^-16 for Zn(OH)2 Kf=3.0x10^15 for Zn(OH)4^-2
Draw the molecule by placing atoms on the grid and connecting them with bonds. Do not identify the charge on each of these species. Include all lone pairs of electrons.
Calculate the pH of the solution after the addition of 0.100 mL NaOH. The Ka for HC2H3O2 is 1.8x10^-5.
a 1 l buffer solution with ph 9.05 is desired. one of the two ingredients of the buffer is hcn. what could the other compound be? Suggest a suitable ratio and determine the exact moles of the two compounds to achieve the desired pH.
A gas is confined to a container with a massless piston at the top.A massless wire is attached to the piston. When an external pressure of 2.00 rm atm is applied to the wire, the gas compresses from 5.90 to 2.95 L. When the external pressure is in..
aluminum oxide decomposes to produce aluminum metal and oxygen gas. When 9.8g of aluminum oxide decomposes, how many grams of aluminum are produced?
At constant pressure, in which of the reactions is work done by the system on the surroundings? By the surroundings on the system? In which of them is no work done?
Sulfur trioxide dissolve in water, producing H2SO4. How much sulfuric acid can be produced from 13.5 mL of water and 26.1g of SO3?
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