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An electron microscope focuses electrons through magnetic lenses toobserve objects at higher magnification than is possible with alight microscope. For any microscope, the smallest object that can b
Benzoic acid is a white crystalline powder used as a foodpreservative. The compound contains 5.0% hydrogen, 26.2% oxygen andthe rest is carbon. It has a molar mass of approximately 122g/mol.
Assume you are performing the calibration step of Experiment 8 and you begin with 70 g of water at 20 oC and 70 g of water at 80 oC.
One reason carbon monoxide (CO) is toxic is that it binds to the protein hemoglobin more strongly than oxygen does. The bond between hemoglobin and CO absorbs radiation of 1953^-1. (Theunits are the
A buffer is created by mixing equal concentrations of NH4+ and NH3. Calculate the volume of both solutions needed to create a buffer of pH = 8.75 with a total volume of 100 mL.
The indicator phenolphthalein is used in this lab and changes from colorless to red at pH around 9 when a base is titrated with an acid.
The pressure inside a soda bottle is two atmospheres (1520mmHg). If exactly half this pressure is generated by CO2,what is the solubility of carbon dioxide in a 2 L bottle of rootbeer at 40 oC? The
Why do we have to redissolve the product we get from the reaction of cyclopentadiene with maleic anhydride? Is it to remove the impurities?
How many grams of dry NH4Cl need to be added to 2.40 L of a 0.400 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.78? Kb for ammonia is 1.8 x 10^-5.
Write the structure of three different substituent groups that activate substituted benzene rings toward electrophilic aromatic substitution.
Calculate the pH of a solution made from mixing 25.0 mL of 2.00 MHCl with 20.0 mL of 1.75 M Ca (OH)2. Giving thatCalcium Chloride is a neutral salt.
As the sample coolsmoisture from the atmosphere condense on the outside oftheevaporating dish before the mass is measure How does the presence of the condensed moisture affect the reported TSD( tota
Assume you are performing the calibration step of Experiment 8 andyou begin with 50 g of water at 20 oC and 50 g of waterat 80 oC.
What mass of copper is required to remove all the silver from asilver nitrate solution containing 1.43 mg of silver nitrate?
The 12.8 gram of sulfur was produced during the thermal decomposition of hydrogen sulfide . How much hydrogen was produced?
If you have 5L of a 10M solution and wish to make 100 mLs of 0.01M, how many mLs of 10M solution would you use and how much water would you add to make the diluted solution?
How many millicuries of radioactivity are associated with a sample containing 5.10 mg Th (mass number of 229), which has a half-life of 7340 years?
Suppose .015 g of dichlorobenzene was combined with 10 ml ofdiethyl ether. This mixture was used to spot a TLC platecoated with silica gel and placed in a chamber of hexene.
The standard recipe used in an exercise uses 3.0 mL of 0.25% phenanthroline solution in 100 mL of final solution to generate the red iron-phenanthroline complex which is determined colorimetrically.
When reacting cyclopentadiene with maleic anhydride, why is theendo-adduct formed exclusively? Why does the exo-adduct not form?Also, Why is cyclopentadiene must be freshly distilled before thereac
The Beer's Law slope for the Fe-phenanthroline complex is found to be 0.2100 L/mg Fe. The absorbance of the diluted unknown solution prepared in accordance with the instructions in the exercise is
Draw the structure of a by product that could be formed whenan aldehyde reacts with acetophenone. Provide a detailed mechanism to account for the formation of this compound.
Hydrogen from the decomposition of water has been promoted as the fuel of the future. What mass of water, in kilograms, would have tobe electrolyzed to produce 125kg of hydrogen?
Assume that 50.0 mL of 0.100 M HCl was added to 125mL of 0.100M sodium Acetate. Is the resulting solution a buffer?Why or whynot? Calculate the pH of the resulting solution.The Ka for aceticacid is