Chemistry concepts and calculations
117302 questions • Page 395 / 2347
A chimpanzee was shown two A chimpanzee was shown two Calculate the molar mass o
A chimpanzee was shown two A chimpanzee was shown two Calculate the molar mass of the unknown solute from the difference between the freezing point of the solution and the pure so…
A chromatogram is obtained for aspirin (acetylsalicylic acid) by “reverse phase”
A chromatogram is obtained for aspirin (acetylsalicylic acid) by “reverse phase” HPLC. The aspirin peak has a retention time of 14.15 minutes using isocratic (constant mobile phas…
A chromatogram of a mixture of ethanol, 1-propanol, and 1-butanol was obtained W
A chromatogram of a mixture of ethanol, 1-propanol, and 1-butanol was obtained Wid a 6 foot column at a flow rate of 30.0 cm3/min. The recorder chart speed was 1.00 in/min. Calcul…
A chromatogram of a mixture of ethanol, 1-propanol, and a 6 foot column at a flo
A chromatogram of a mixture of ethanol, 1-propanol, and a 6 foot column at a flow rate in/min. Calculate the adjusted retention time (t) for etha resolution (R) between the ethano…
A chunk of silver weighing 18,3 grams and originally at 97.00 °C is droped into
A chunk of silver weighing 18,3 grams and originally at 97.00 °C is droped into an insulated cup containing 83.0 grams of water at 22.65 °C. Assuming that all of the heat is trans…
A cigarette lighter weighs 16.3482 g initially. This lighter is opened under wat
A cigarette lighter weighs 16.3482 g initially. This lighter is opened under water and 12.34 ml of gas bubbling from the lighter is collected by water displacement in an inverted …
A circa WW2 German ship filled with gold bullion is discovered on the floor of t
A circa WW2 German ship filled with gold bullion is discovered on the floor of the North Atlantic. Complicating recovery efforts is the depth of ocean which is determined to 470 m…
A circuit is constructed that has a 6.00 V battery connected across a 1900.0 ? r
A circuit is constructed that has a 6.00 V battery connected across a 1900.0 ? resistor. Determine the following parameters of this circuit: circuit is constructed that has a 6.00…
A circuit is constructed with five resistors and a battery as shown. The battery
A circuit is constructed with five resistors and a battery as shown. The battery voltage is V = 12 V. The values for the resistors are: R1-59 , R2 = 106 , R3-164 , and R4-93 . The…
A circuit is constructed with five resistors and a battery as shown. The values
A circuit is constructed with five resistors and a battery as shown. The values for the resistors are: R1-R5-75 -R2-142 , R3-1060, and R4 -134 . The battery voltage is V-12 V RI R…
A circuit is constructed with five resistors and a battery as shown. The values
A circuit is constructed with five resistors and a battery as shown. The values for the resistors are: R1 = R5 = 71 , R2 = 139 , R3 = 101 , and R4 = 124 . The battery voltage is V…
A circuit is constructed with four resistors, one capacitor, one battery and a s
A circuit is constructed with four resistors, one capacitor, one battery and a switch as shown. The values for the resistors are: R1 = R2 = 58 ?, R3 = 62 ? and R4 = 150 ?. The cap…
A circuit is constructed with six resistors and two batteries as shown. The batt
A circuit is constructed with six resistors and two batteries as shown. The battery voltages are V1 = 18 V and V2 = 12 V. The positive terminals are indicated with a + sign, The v…
A circular coil of wire of diameter 0.125 m containing three loops lays flat on
A circular coil of wire of diameter 0.125 m containing three loops lays flat on a table in a uniform magnetic field directed straight upward. the strength of the magnetic field de…
A circular linked list (CLL) is a linked list in which the next pointer of the l
A circular linked list (CLL) is a linked list in which the next pointer of the last node in the list points back to the ?rst node. We can access both ends of a CLL with a single t…
A circular loop and a long, straight wire carry currents as shown in the figure
A circular loop and a long, straight wire carry currents as shown in the figure below. The current in the wire is I_1 = 14.0 A, toward the right in the sketch. The current in the …
A civic piece of uranium metal (specific heat capacity=0.117J/C-g) at 200.0°C is
A civic piece of uranium metal (specific heat capacity=0.117J/C-g) at 200.0°C is dropped into 1.00L of deuterium oxide ("heavy water", specific heat capacity=4.211J/C-g) at 25.5°C…
A clashed wastewater containing 5 mg/L NH_3N to be breakpoint chlorinated (Le al
A clashed wastewater containing 5 mg/L NH_3N to be breakpoint chlorinated (Le all the ammonia oxidized to nitrogen gas), The water has an alkalinity of 100 mg/L as CaCO_2. Note th…
A classic experiment in equilibrium studies dating from 1862 involved the reacti
A classic experiment in equilibrium studies dating from 1862 involved the reaction in aqueous solution of ethanol and acetic acid to produce ethyl acetate and water. C2H5OH(aq) + …
A classical procedure for determining nitrogen in materials is called the Kjedah
A classical procedure for determining nitrogen in materials is called the Kjedahl method. The sample is digested in concentrated sulfuric acid with a reducing agent to convert all…
A classmate of yours is having a hard time with the concepts of Theoretical Oxyg
A classmate of yours is having a hard time with the concepts of Theoretical Oxygen Demand (ThOD), Carbonaceous Biochemical Oxygen Demand (CBOD), and Nitrogenous Biochemical Oxygen…
A classmate of yours, an inexperienced Winemaker in a small but very friendly la
A classmate of yours, an inexperienced Winemaker in a small but very friendly landlocked Balkan country asks for your advice on SO2. She has a Vranec with the characteristics belo…
A cleaning solution is made up by combining one part phosphoric acid concentrate
A cleaning solution is made up by combining one part phosphoric acid concentrate with eight parts of water. A food technician has 10 L of the cleaning solution already prepared an…
A clear liquid was found in a laboratory, and it was desired to know if it could
A clear liquid was found in a laboratory, and it was desired to know if it could be disposed of safely down the drain. It was found to be miscible with water and weakly acidic. Wh…
A clever chemical engineer has devised the thermally operated elevator shown at
A clever chemical engineer has devised the thermally operated elevator shown at the bottom of this page. The elevator compartment is made to rise by electrically heating the air c…
A client I did a project for accidentally ended up with the source code of said
A client I did a project for accidentally ended up with the source code of said project. Stupid i know. The arrangement was that they would get the product, never the source code.…
A client has a small rehab clinic. They do everything using paperwork . There ab
A client has a small rehab clinic. They do everything using paperwork . There about 5-6 doctors. So it is a multi-user app. They need to keep some forms, medical records etc about…
A climbing rope is hanging from the ceiling in a gymnasium. A student grabs the
A climbing rope is hanging from the ceiling in a gymnasium. A student grabs the end of the rope and begin s moving it back and forth with a constant amplitude and frequency. A tra…
A clinic took temperature readings of 250 flu patients over a weekend and discov
A clinic took temperature readings of 250 flu patients over a weekend and discovered the temperature distribution to be Gaussian, with a mean of 101.20°F and a standard deviation …
A clinic took temperature readings of 250 flu patients over a weekend and discov
A clinic took temperature readings of 250 flu patients over a weekend and discovered the temperature distribution to be Gaussian, with a mean of 101.20°F and a standard deviation …
A clinic took temperature readings of 250 flu patients over a weekend and discov
A clinic took temperature readings of 250 flu patients over a weekend and discovered the temperature distribution, to be Gaussian with a mean of 101.00 F and a standard deviation …
A clinic took temperature readings of 250 flu patients over a weekend and discov
A clinic took temperature readings of 250 flu patients over a weekend and discovered the temperature distribution to be Gaussian, with a mean of 101.70°F and a standard deviation …
A clinic took temperature readings of 250 flu patients over a weekend and discov
A clinic took temperature readings of 250 flu patients over a weekend and discovered the temperature distribution to be Gaussian, with a mean of 101.20°F and a standard deviation …
A clinic took temperature readings of 250 flu patients over a weekend and discov
A clinic took temperature readings of 250 flu patients over a weekend and discovered the temperature distribution to be Gaussian, with a mean of 101.20°F and a standard deviation …
A clinical chemist wants to use a fluorescently labeled antibody for staining a
A clinical chemist wants to use a fluorescently labeled antibody for staining a cancer biomarker in histological tissue sections. Anti-Her2 (an antibody targeted to Herceptin-2, a…
A clinical laboratory tested a new method for determining serum chloride ion con
A clinical laboratory tested a new method for determining serum chloride ion concentration. The method gives the following results for a reference sample: 34.7, 35.6, 34.3, 35.9, …
A clock reaction is run at 20 ºC with several different mixtures of iodide, sodi
A clock reaction is run at 20 ºC with several different mixtures of iodide, sodium bromate and acid, to form iodine. Thiosulfate is used to react with the iodine formed initially.…
A closed adiabatic piston-cylinder apparatus is set up as shown below. The pisto
A closed adiabatic piston-cylinder apparatus is set up as shown below. The piston separates the volume within the cylinder into two partitions. Side A is initially at volume 0.1 m…
A closed adiabatic piston-cylinder apparatus is set up as shown below. The pisto
A closed adiabatic piston-cylinder apparatus is set up as shown below. The piston separates the volume within the cylinder into two partitions. Side A is initially at volume 0.1 m…
A closed system initially containing 2.00 Times 10^-2 M H_2 and 4.00 Times 10^-2
A closed system initially containing 2.00 Times 10^-2 M H_2 and 4.00 Times 10^-2 M I-2 at 448 degree C is allowed to reach equilibrium. Analysis of the equilibrium mixture shows t…
A closed system initially containing nitrogen at a pressure of 0.7900 atm and hy
A closed system initially containing nitrogen at a pressure of 0.7900 atm and hydrogen at 0.4990 atm at 750 K is allowed to reach equilibrium. The value for the equilibrium consta…
A closed vessel contains water and a gaseous mixture of N2 and He at T=298 K. Th
A closed vessel contains water and a gaseous mixture of N2 and He at T=298 K. The mole fraction of gaseous N2 is 0.45. The henrys constant of N2 is 1.7 times larger than that of H…
A closed, uninsulated system was fitted with a movable piston. Introduction of 4
A closed, uninsulated system was fitted with a movable piston. Introduction of 483 J of heat caused the system to expand, doing 320 J of work in the process against a constant pre…
A cloudy, colloidal precipitate of Agl forms in a solution containing Nal and ex
A cloudy, colloidal precipitate of Agl forms in a solution containing Nal and excess AgNO_3. How would you describe the surface of the growing colloidal precipitate? A positive su…
A clumsy ENVSE professor accidentally spills a bottle containing 125 mL of m-xyl
A clumsy ENVSE professor accidentally spills a bottle containing 125 mL of m-xylene (CAS 108-383) in a laboratory measuring 12 ft x 15 ft x 8 ft. Assuming that the contents comple…
A co-worker and I were looking at the behavior of the new keyword in C# as it ap
A co-worker and I were looking at the behavior of the new keyword in C# as it applies to the concept of hiding. From the documentation: Use the new modifier to explicitly hide a m…
A co-worker in the small start-up I work at writes (C++) code like this: // some
A co-worker in the small start-up I work at writes (C++) code like this: // some class class SomeClass { // c'tor SomeClass(); // d'tor ~SomeClass(); // some f…
A coal fired steam-electric plant burns 90 kg of coal per second. The coal has a
A coal fired steam-electric plant burns 90 kg of coal per second. The coal has a heating value of 14000 Btu/lb (1 BTU = 1054J), an ash content of 7% and a sulfure content of 1.1%.…
A coal source contains 1.0% sulfur by mass. Part A If 1.5×10 4 kg of coal is bur
A coal source contains 1.0% sulfur by mass. Part A If 1.5×104 kg of coal is burned and forms oxides, calculate the mass of CaSO4(s) that is produced from "scrubbing" the SO2 pollu…
A coal with the following composition is burned at a rate of 15000 kg per hour i
A coal with the following composition is burned at a rate of 15000 kg per hour in a power plant. The excess air used was 20%. Carbon - 66.10%, Hydrogen- 6.03%, Oxygen -11.91%, Nit…
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