Chemistry concepts and calculations

You perform column chromatography on a mixture of reaction products which shows

You perform column chromatography on a mixture of reaction products which shows two spots on TLC. However, under coulumn conditions you chose those two compounds do not seperate. …

You perform recrystallization of 1 g of impure acetanilide from water. The solub

You perform recrystallization of 1 g of impure acetanilide from water. The solubility of pure acetanilide in hot water is 50g/L The solubility of purea Taking these data into cons…

You perform recrystallization of 1 g of impure acetanilide from water. The solub

You perform recrystallization of 1 g of impure acetanilide from water. The solubility of pure acetanilide in hot water is 50g/L The solubility of purea Taking these data into cons…

You perform the Aldol reaction between A and B below to make C . After about an

You perform the Aldol reaction between A and B below to make C. After about an hour of stirring, you take a TLC of the reaction to see if it is complete. The aliquot taken from th…

You perform the experiment and find your average atomic mass to be 54.59. Based

You perform the experiment and find your average atomic mass to be 54.59. Based off this, you assume your unknown volatile liquid is acetone. Use the table below to find the molar…

You perform the experiment and find your average atomic mass to be 54.59. Based

You perform the experiment and find your average atomic mass to be 54.59. Based off this, you assume your unknown volatile liquid is acetone. Use the table below to find the molar…

You perform the experiment with a 2.97 gram tablet of Alka-Seltzer. You calculat

You perform the experiment with a 2.97 gram tablet of Alka-Seltzer. You calculate that 0.51 grams of sodium bicarbonate reacted. What is the mass percent of sodium bicarbonate in …

You performed these reactions in an acidic solution(diluting with 0.1MHNO3). Thi

You performed these reactions in an acidic solution(diluting with 0.1MHNO3). This is because iron forms an insoluble hydroxide even when these solutions do not contain excess hydr…

You performed these reactions in an acidic solution(diluting with 0.1MHNO3). Thi

You performed these reactions in an acidic solution(diluting with 0.1MHNO3). This is because iron forms an insoluble hydroxide even when these solutions do not contain excess hydr…

You performed these reactions in an acidic solution(diluting with 0.1MHNO3). Thi

You performed these reactions in an acidic solution(diluting with 0.1MHNO3). This is because iron forms an insoluble hydroxide even when these solutions do not contain excess hydr…

You place 3.52 g of sodium hydroxide to disolve in a calorimeter cup. The cup co

You place 3.52 g of sodium hydroxide to disolve in a calorimeter cup. The cup contains, 1,000.0 mL of water at 20.0 degrees Celcius (in a calorimeter cup). As the sodium hydroxide…

You place a glass of 5°C water outside on a hot day when the temperature is 36°C

You place a glass of 5°C water outside on a hot day when the temperature is 36°C. In the first 10 minutes, the temperature of the water rises 5°C. (a) Now that the water has been …

You placed a sample of a hydrate of calcium chloride (CaCl 2 ) in a weighed test

You placed a sample of a hydrate of calcium chloride (CaCl2) in a weighed test tube, and weighed the filled test tube. Then you heated it until no more water was evolved. After co…

You placed exactly 4.35 g of brass into a calorimeter with 50ml of water and mea

You placed exactly 4.35 g of brass into a calorimeter with 50ml of water and measured the temperature change. You repeated this two more times using the exact same amount of salt …

You plan to prepare a buffer solution of pH 5.75 from sodium acetate (NaCH3COO)

You plan to prepare a buffer solution of pH 5.75 from sodium acetate (NaCH3COO) and acetic acid (CH3COOH, Ka= 1.8x10^-5). a) Write a chemical equation for the addition of acetic a…

You plan to take a trip to the moon. Since you do not have a traditional spacesh

You plan to take a trip to the moon. Since you do not have a traditional spaceship with rockets, you will need to leave the earth with enough speed to make it to the moon. Some in…

You prepare NaOH solution by dissolving 1.7650g of pure BaOH in sufficient water

You prepare NaOH solution by dissolving 1.7650g of pure BaOH in sufficient water to make 400mLs of solution. What is the molarity of the sodium hydroxide solution? A) if you use 2…

You prepare a 0.100 M solution of an unknown weak acid HA and measure the pH at

You prepare a 0.100 M solution of an unknown weak acid HA and measure the pH at 25°C. The pH of your solution is unique. Every student in the class may have a different pH value. …

You prepare a 0.200M solution of a monoprotic buffer at pH 7.22. The pKa of this

You prepare a 0.200M solution of a monoprotic buffer at pH 7.22. The pKa of this buffer is 7.53 at room temperature. a. What is the molarity of the acid and conjugate base necessa…

You prepare a 0.200M solution of a monoprotic buffer at pH 7.22. The pKa of this

You prepare a 0.200M solution of a monoprotic buffer at pH 7.22. The pKa of this buffer is 7.53 at room temperature. a. What is the molarity of the acid and conjugate base necessa…

You prepare a 0.200M solution of a monoprotic buffer at pH 7.22. The pKa of this

You prepare a 0.200M solution of a monoprotic buffer at pH 7.22. The pKa of this buffer is 7.53 at room temperature. a. What is the molarity of the acid and conjugate base necessa…

You prepare a Mg 2+ standard solution by dissolving 0.101 g of solid MgSO 4 x7H

You prepare a Mg2+ standard solution by dissolving 0.101 g of solid MgSO4x7H2O in a 100mL volumetric flask and then performing a dilution of this solution into a 50 mL volumetric …

You prepare a buffer solution from 10.0 mL of 0.100 M MOPS (3-morpholinopropane-

You prepare a buffer solution from 10.0 mL of 0.100 M MOPS (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.081 M NaOH. Next, you add 1.00 mL of 5.97 × 10-4 M lidocaine to t…

You prepare a buffer solution from 10.0 mL of 0.100 M MOPS (3-morpholinopropane-

You prepare a buffer solution from 10.0 mL of 0.100 M MOPS (3-morpholinopropane-1-sulfonic acid) and 10.0 mL of 0.079 M NaOH. Next, you add 1.00 mL of 5.67 × 10^-5 M lidocaine to …

You prepare a diluted NaOH solution by adding 15 mL of 3 M NaOH to 435 mL of dis

You prepare a diluted NaOH solution by adding 15 mL of 3 M NaOH to 435 mL of distilled water and stir for several minutes. In a clean dry beaker you obtain about 75 mL of standard…

You prepare a diluted NaOH solution by adding 15 mL of 3 M NaOH to 435 mL of dis

You prepare a diluted NaOH solution by adding 15 mL of 3 M NaOH to 435 mL of distilled water anc stir for several minutes. In a clean dry beaker you obtain about 75 the molarity. …

You prepare a solution by adding the following ingredients in the order indicate

You prepare a solution by adding the following ingredients in the order indicated: 600 mL H2O, 125 mL 1.6 M LiCl, 50 mL 20 % (m/v) MgCl2, and 25 mL 10g/L NaCl. The properties of e…

You prepare a solution by dissolving 5.07 grams of K2HPO43•H2O in about 50 mL of

You prepare a solution by dissolving 5.07 grams of K2HPO43•H2O in about 50 mL of water, which you transfer to a 250.0 mL volumetric flask. What volume of which solution should you…

You prepare a standard solution of ferrous ammonium sulfate that is 50.0 ppm in

You prepare a standard solution of ferrous ammonium sulfate that is 50.0 ppm in Fe. You pipette aliquots of 0.50 mL, 1.00 mL, 2.00 mL, 4.00 mL, 8.00 mL, and 10.00 mL into 100-mL v…

You prepare a standard solution of ferrous ammonium sulfate that is 50.0 ppm in

You prepare a standard solution of ferrous ammonium sulfate that is 50.0 ppm in Fe. You pipette aliquots of 0.50 mL, 1.00 mL, 2.00 mL, 4.00 mL, 8.00 mL, and 10.00 mL into 100-mL v…

You prepared a solution using 4.0mL of .10M CuSO 4 ( copper (ll) sulfate) and 5.

You prepared a solution using 4.0mL of .10M CuSO4 (copper (ll) sulfate) and 5.0mL of .10M Na2C4H4O6 (sodium tartrate), lastly you added 1.0mL of deionized water for a total volume…

You probably heard about deep-sea diving with suits in which the divers breath f

You probably heard about deep-sea diving with suits in which the divers breath fluids. The movie "The Abyss" portrays it wonderfully. The diver is put into a diving suit which is …

You probably know that when two objects at different temperatures are brought in

You probably know that when two objects at different temperatures are brought into contact, heat always travels from the hotter object to the colder object; never the reverse. Ima…

You probably know the list of open source licenses officially approved by the OS

You probably know the list of open source licenses officially approved by the OSI. Most notably I guess would be the GPL, MIT, [insert your favorite license here]. I recently ran …

You proceed to measure the equilibrium constant at three more temperatures, and

You proceed to measure the equilibrium constant at three more temperatures, and now have the following results: Temperature (K) Equilibrium constant 100.0 ± 0.01 (1.6±0.1) ×104 15…

You purchased a 2 story building and aspired to turn it into office spaces for l

You purchased a 2 story building and aspired to turn it into office spaces for lease. Floor 1 has 16 office spaces and Floor 2 has 10. Your business strategy is to lease each spac…

You purify a small protein from e-coli and run Edman degradation on it. You see

You purify a small protein from e-coli and run Edman degradation on it. You see strange results: Below are the major peaks of each of the first 4 runs. Run 1: M Run 2: M, C Run 3:…

You purify a small protein from e-coli and run Edman degradation on it. You see

You purify a small protein from e-coli and run Edman degradation on it. You see strange results: Below are the major peaks of each of the first 4 runs. Run 1: M Run 2: M, C Run 3:…

You put some potatoes in a big pot of cold water with the lid not too tightly cl

You put some potatoes in a big pot of cold water with the lid not too tightly closed. Which of the following methods to cook the potatoes would use the least amount of energy? Exp…

You ran a mixed melting point of the salicylic acid you synthesized with a comme

You ran a mixed melting point of the salicylic acid you synthesized with a commercial sample of salicylic acid. If this commercial sample was inadvertently mislabeled and containe…

You react 100.0 ml of a 1.01 M HBr(aq) solution with 99.1 mlof a 1.05 M KOH(aq)

You react 100.0 ml of a 1.01 M HBr(aq) solution with 99.1 mlof a 1.05 M KOH(aq) solution. The density of each solution is 1.04g/ml. The heat capacity of the calorimeter is 7.0 J/C…

You receive a urine specimen in the laboratory with a request for a complete uri

You receive a urine specimen in the laboratory with a request for a complete urinalysis. The cup is labeled and you begin your testing. You finish testing and report the results t…

You receive results from Sanger sequencing of an expression construct. You are s

You receive results from Sanger sequencing of an expression construct. You are sequencing the region containing the start codon that corresponds to the amino- terminus of the prot…

You received an unsolicited proposal from a self-declared inventor who is seekin

You received an unsolicited proposal from a self-declared inventor who is seeking investors for the development of his latest idea: a device that uses heat extracted from the grou…

You received an unsolicited proposal from a self-declared inventor who is seekin

You received an unsolicited proposal from a self-declared inventor who is seeking investors for the development of his latest idea: a device that uses heat extracted from the grou…