Chemistry concepts and calculations

You have a 0.125 M solution of benzoic acid. You now add enough sodium benzoate

You have a 0.125 M solution of benzoic acid. You now add enough sodium benzoate to get to a benzoate concentration of 0.15 M. What is the pH of the resulting buffer solution You h…

You have a 0.355 m potassium chloride solution. The solvent is water. What is th

You have a 0.355 m potassium chloride solution. The solvent is water. What is the mass percent of potassium chloride in it? Given the reaction; 2 Al (s) + 6 HNO_3 (aq) rightarrow …

You have a 0.4674 g sample of sodium carbonate (Na2CO3), which you suspect is co

You have a 0.4674 g sample of sodium carbonate (Na2CO3), which you suspect is contaminat-ed with an inert white substance. You place this entire mass into a 250 mL Erlenmeyer flas…

You have a 1.0-L flask filled with phosphorous pentachloride (PCl_5) at a high e

You have a 1.0-L flask filled with phosphorous pentachloride (PCl_5) at a high enough temperature such that it is entirely in gaseous form. You remember that PCl_5 can decompose i…

You have a 10mL preparation of a bioproduct and wish to perform dialysis to desa

You have a 10mL preparation of a bioproduct and wish to perform dialysis to desalt (remove NaCl) while keeping a 100 kDa protein However, the buffer solution which you use to perf…

You have a 20X solution, and need 1 liter of a 0.5X solution. What volumes of 20

You have a 20X solution, and need 1 liter of a 0.5X solution. What volumes of 20X solution and water do you need? If you need to make a 1 in 10 dilution of a stock solution, and r…

You have a 26.3 % (by mass) solution of ethanol (CH_3CH_2OH) in water. What is t

You have a 26.3 % (by mass) solution of ethanol (CH_3CH_2OH) in water. What is the mole fraction of ethanol? You have a 0.925 molality solution of C_6H_12O_6 in water. If the dens…

You have a 5.82 calorimeter containing some water at roomtemperature (22.0degC).

You have a 5.82 calorimeter containing some water at roomtemperature (22.0degC). When you add 40.33g boiling water, thetemperature raises to 50.9degC. The calorimeter constant is1…

You have a 5.82 calorimeter containing some water at roomtemperature (22.0degC).

You have a 5.82 calorimeter containing some water at roomtemperature (22.0degC). When you add 40.33g boiling water, thetemperature raises to 50.9degC. The calorimeter constant is1…

You have a 5.82 calorimeter containing some water at roomtemperature (22.0degC).

You have a 5.82 calorimeter containing some water at roomtemperature (22.0degC). When you add 40.33g boiling water, thetemperature raises to 50.9degC. The calorimeter constant is1…

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL of 1.1M HCl. When you add 25.3mL of 1.9MNaOH, the temperature raises to 31.1deg C. The total mass …

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL of 1.1M HCl. When you add 25.3mL of 1.9MNaOH, the temperature raises to 31.1deg C. The total mass …

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL of 1.1M HCl. When you add 25.3mL of 1.9MNaOH, the temperature raises to 31.1deg C. The total mass …

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL

You have a 5.82 calorimeter containing some water at roomtemperature with 49.2mL of 1.1M HCl. When you add 25.3mL of 1.9MNaOH, the temperature raises to 31.1deg C. The total mass …

You have a 50.0mL solution of 1.35M NH_3 which you are titrating with a 0.75M so

You have a 50.0mL solution of 1.35M NH_3 which you are titrating with a 0.75M solution of HBr (K_B(nh3)= 1.8 times 10^-5) What is the pH before you start titration? Suppose that 0…

You have a 76.9-mF capacitor initially charged to a potential difference of 10.7

You have a 76.9-mF capacitor initially charged to a potential difference of 10.7 V. You discharge the capacitor through a 4.07-ohm resistor. What is the time constant? After what …

You have a DNA stork solution with a concentration of 0.75 mg/ml. Describe how y

You have a DNA stork solution with a concentration of 0.75 mg/ml. Describe how yon would use this stock solution to prepare 8.0 ml of DNA solution with an A_200 = 0.39. Again, wri…

You have a bacterial broth culture that contains 1 times 10^11 cells/ml. From th

You have a bacterial broth culture that contains 1 times 10^11 cells/ml. From this stock culture you take 10 mu l and add it to 990 mu l of sterile broth. You label this tube 1. F…

You have a badly tarnished silver teapot. The tarnish is a result of the silver

You have a badly tarnished silver teapot. The tarnish is a result of the silver metal reacting with the oxygen in the air according to 4Ag(s) + O2(g) rightarrow 2Ag2O(s), Delta H …

You have a binary mixture of ethane and propane (C2 – C3) in a closed vessel at

You have a binary mixture of ethane and propane (C2 – C3) in a closed vessel at 6 bar and a temperature of 273K. By sloshing the container around you can tell that it is partially…

You have a class ImperialLength that stores values in inches. It can covert to a

You have a class ImperialLength that stores values in inches. It can covert to and from feet and inches to total-inches. The current class is implemented with files ImperialLength…

You have a cold gas of gold atoms, and you observe that if you shine light consi

You have a cold gas of gold atoms, and you observe that if you shine light consisting of photons with energy 10.2 eV through the gas, some free electrons are observed, implying th…

You have a compound dissolved in cholroform and need to remove the solvent by di

You have a compound dissolved in cholroform and need to remove the solvent by distillation. Because the compound is heat sensitive, you hesitate to raise the temperature above 278…

You have a flask in your laboratory on which the label is smudged. From what you

You have a flask in your laboratory on which the label is smudged. From what you are able to read, it is a solution of a monoprotic acid (we’ll call it HX) at a concentration of 2…

You have a flask in your laboratory on which the label is smudged. From what you

You have a flask in your laboratory on which the label is smudged. From what you are able to read, it is a solution of a monoprotic acid (well call it HX) at a concentration of 2E…

You have a gas confined to a cylinder with a movable piston. What would happen t

You have a gas confined to a cylinder with a movable piston. What would happen to the gas pressure inside the cylinder if you do the following? (a) Double the volume while holding…

You have a gas cylinder containing an unknown gas. You remove some of the gas, p

You have a gas cylinder containing an unknown gas. You remove some of the gas, putting it into a glass bulb. The mass of the cylinder decreases by 1.384 g. This bulb is attached t…

You have a large amount of 9.00 M stock solution. You need 1.80 L of 3.00 M solu

You have a large amount of 9.00 M stock solution. You need 1.80 L of 3.00 M solution for an experiment. How would you prepare the desired solution without wasting any stock soluti…

You have a lasagna with bechamel sauce (butter, milk and flour). After heathing

You have a lasagna with bechamel sauce (butter, milk and flour). After heathing the lasagne, the sauce liquifies. What is a possible reason? Which force works on it? (course is rh…

You have a liquid-phase mixture of 0.550 mol fraction ethanol and 0.450 mol frac

You have a liquid-phase mixture of 0.550 mol fraction ethanol and 0.450 mol fraction water at 760.0 mmHg. You'd like to calculate the bubble-point temperature of the mixture, and …

You have a material (not unlike water) whose molar specific heat Cp at atmo- sph

You have a material (not unlike water) whose molar specific heat Cp at atmo- spheric pressure is 30J/(mole K) in the gaseous phase, 75 J/(mole K) in the liquid phase, and 35 J/(mo…

You have a mixture containing 5.0 g of Compound X contaminated with 0.4 g of Com

You have a mixture containing 5.0 g of Compound X contaminated with 0.4 g of Compound Y (total 5.4 g). Some data for the two compounds is given in the table below. A) What minimum…

You have a mixture of 5 Proteins. Their relation characteristic pI value are not

You have a mixture of 5 Proteins. Their relation characteristic pI value are noted in relation to the a working pH of 6.5 for the experiment: Suppose that your column (sec questio…

You have a mixture of salt (NaCl), aluminum drink cans, and plastic coke bottles

You have a mixture of salt (NaCl), aluminum drink cans, and plastic coke bottles. How can you separate these from each other besides individually removing the items by hand? You h…

You have a mixture of solids in the ratio of 50:3 for A : B. You are planning to

You have a mixture of solids in the ratio of 50:3 for A : B. You are planning to use the technique of recrystallization to purify A and realize that you will first need to determi…

You have a mixture of solids in the ratio of 50:3 for A : B. You are planning to

You have a mixture of solids in the ratio of 50:3 for A : B. You are planning to use the technique of recrystallization to purify A and realize that you will first need to determi…

You have a mixture of the following proteins: Protein A, 25 kDa, pl 5.4 Protein

You have a mixture of the following proteins: Protein A, 25 kDa, pl 5.4 Protein B. fused with a His tag. 140 kDa, pl 5.2 Protein C, 23 kDa, pl 9.5 Protein D, 60 kDa, pl 8.2 Protei…

You have a mixture of two solutions containing valuable metal ions, copper and s

You have a mixture of two solutions containing valuable metal ions, copper and silver. The [Cu2+] = 0.011 M, and the [Ag+ ] = 0.78 M. You are interested in separating one metal fr…

You have a plume of hexavalent chromium as chromate (CrO_4^2-) that will be redu

You have a plume of hexavalent chromium as chromate (CrO_4^2-) that will be reduced to insoluble Cr^3+. The molecular mass of chromate is 115.9 g/mol. The concentration is 238 ppm…

You have a protein solution. You take 5 ml of the solution, and add 45 ml of buf

You have a protein solution. You take 5 ml of the solution, and add 45 ml of buffer. You then add 30 µl of the dilute protein solution to 70 µl of buffer and 2 ml of Coomassie sol…

You have a protein that binds Nitrogen gas as a regulatory molecule. However, do

You have a protein that binds Nitrogen gas as a regulatory molecule. However, don't know the nature of the interaction between the protein and the nitrogen molecules. You perform …

You have a reactor that is releasing Cd^(2+). Your effluent standards state that

You have a reactor that is releasing Cd^(2+). Your effluent standards state that the concentration of Cd^(2+) leaving the reactor has to be less than 0.01 mg/L. There are two poss…

You have a sample of a gaseous compound which has a density of 7.11 kg/m^3 at 58

You have a sample of a gaseous compound which has a density of 7.11 kg/m^3 at 58 degree C and 82.2 kPa. What is the molar mass of this gas? This same gas sample is (by mass) 20.2%…

You have a sample of perfect gas in a cylinder separated by africtionless adiaba

You have a sample of perfect gas in a cylinder separated by africtionless adiabatic piston into two sections (A and B). Section B is in a waterbath that keeps its temperature cons…

You have a sample that contains the same number of atoms of the two radioactive

You have a sample that contains the same number of atoms of the two radioactive isotopes of Neon; "Ne and 2"Ne. At some time in the future you find that the sample contains more N…

You have a set of k identical glass jars and a ladder with n rungs. You want to

You have a set of k identical glass jars and a ladder with n rungs. You want to determine the highest rung of the ladder from which a jar can be dropped and not break. If k = 1 th…

You have a silicon wafer and diffuse osmium (Os), which has a difusion coefficie

You have a silicon wafer and diffuse osmium (Os), which has a difusion coefficient of 10-189cm2/s at 1000°C, an activation energy for diffusion of 3.6 eV, and a surface solubility…

You have a silicon wafer and diffuse osmium (Os), which has a difusion coefficie

You have a silicon wafer and diffuse osmium (Os), which has a difusion coefficient of 10-189cm2/s at 1000°C, an activation energy for diffusion of 3.6 eV, and a surface solubility…

You have a small but seemingly pure sample of an unknown white powder containing

You have a small but seemingly pure sample of an unknown white powder containing only C, H, and O. To analyze the compound, you determine its empirical formula by analysis for C a…

You have a small but seemingly pure sample of an unknown white powder containing

You have a small but seemingly pure sample of an unknown white powder containing only C, H, and O. To analyze the compound, you determine its empirical formula by analysis for C a…