Chemistry concepts and calculations

1) A reaction was run with two different initial concentrations of reactants A a

1) A reaction was run with two different initial concentrations of reactants A and B: Experiment A / M B / M rateB / (M/sec) 1 0.00082 0.00053 0.0737 2 0.00082 0.00228 0.3169 What…

1) A saline solution contains 8.4 g of NaCl in 1.00 kg of water. Assuming an ide

1) A saline solution contains 8.4 g of NaCl in 1.00 kg of water. Assuming an ideal value for the Van't Hoff factor, i, calculate the freezing point of this solution in oC. 2) At w…

1) A sample initially contains 8.0 moles of a radioactive isotope. How much of t

1) A sample initially contains 8.0 moles of a radioactive isotope. How much of the sample remains after five half-lives? Express your answer using two significant figures. 2) Cons…

1) A sample of He has a volume of 0.180 L, a pressure 0.800 atm and a temperatur

1) A sample of He has a volume of 0.180 L, a pressure 0.800 atm and a temperature of 302 K. At what temperature (K) will the He have a volume of 90.0 mL and a pressure of 3.20 atm…

1) A sample of Xe gas has a volume of 852 mL, has a pressure of 523 mm Hg, and i

1) A sample of Xe gas has a volume of 852 mL, has a pressure of 523 mm Hg, and is at a temperature of 17.1 °C. Calculate the amount (in moles) of Xe in the gas sample. = ? mol 2) …

1) A sample of Xe gas has a volume of 852 mL, has a pressure of 523 mm Hg, and i

1) A sample of Xe gas has a volume of 852 mL, has a pressure of 523 mm Hg, and is at a temperature of 17.1 °C. Calculate the amount (in moles) of Xe in the gas sample.= ? mol 2) A…

1) A sample of gas in a balloon has an initial temperature of 36 C and a volume

1) A sample of gas in a balloon has an initial temperature of 36 C and a volume of 1.76×103 L . If the temperature changes to 70. C , and there is no change of pressure or amount …

1) A sample of gold has a mass of 295.0 lb and a volume of 0.2446 ft3. What is i

  1) A sample of gold has a mass of 295.0 lb and a volume of 0.2446 ft3. What is its specific gravity?    B)  What are the units of specific gravity?    C) A sample of metal has a…

1) A sample of limestone is heated, and the CO2 gas released is collected in an

1) A sample of limestone is heated, and the CO2 gas released is collected in an evacuated flask connected to an open-end manometer. If the atmospheric pressure is 0.9475 atm and g…

1) A sample of methane gas is introduced into an evacuated 5.0 L container, unti

1) A sample of methane gas is introduced into an evacuated 5.0 L container, until a pressure of 3.2 atm is attained. What volume change is required to reduce the methane pressure …

1) A sample of steam with a mass of 0.505 g and at a temperature of 100 C conden

1) A sample of steam with a mass of 0.505 g and at a temperature of 100 C condenses into an insulated container holding 4.25 g of water at 3.0C.( Hvap=40.7 kJ/mol, Cwater=4.18 J/g…

1) A soil sample of 2.0134g was extracted, transferred to a 100.00ml volumetric

1) A soil sample of 2.0134g was extracted, transferred to a 100.00ml volumetric flask. A 10.00mL aliquot was titrated with EDTA of molarity 0.002052M and the volume of EDTANa2 was…

1) A solution containing more than the equilibrium amount is called ________. 2)

1)    A solution containing more than the equilibrium amount is called ________. 2)     Which of the following statements is generally TRUE? A) The solubility of a solid is not de…

1) A solution contains 27.79 grams of NaCl in .909 kg water at 25 degrees celciu

1) A solution contains 27.79 grams of NaCl in .909 kg water at 25 degrees celcius. What is the vapor pressure of the solution? (The molar mass of NaCl is 58.44 g/mol. The molar ma…

1) A solution contains 5.27×10-3 M chromium(III) acetate and 5.78×10-3 M zinc ni

1) A solution contains 5.27×10-3 M chromium(III) acetate and 5.78×10-3 M zinc nitrate. Solid potassium phosphate is added slowly to this mixture. What is the concentration of chro…

1) A solution contains 5.72×10-3 M manganese(II) nitrate and 6.51×10-3 M lead ac

1) A solution contains 5.72×10-3 M manganese(II) nitrate and 6.51×10-3 M lead acetate. Solid ammonium carbonate is added slowly to this mixture. What is the concentration of lead …

1) A solution contains Pb2+ and Zn2+ ions, with nitrate as the counter ion. Cons

1) A solution contains Pb2+ and Zn2+ ions, with nitrate as the counter ion. Consult the solubility rules to answer the following questions. a. NaOH is added. What precipitate (or …

1) A solution is 0.020 M in each Ca 2+ and Cd 2+ . Adjusting the pH of the solut

1) A solution is 0.020 M in each Ca2+ and Cd2+. Adjusting the pH of the solution to which of the following values would achieve the best separation by precipitation of the hydroxi…

1) A solution is 5 mM in each of the following ions: Indicate which of the metal

1) A solution is 5 mM in each of the following ions: Indicate which of the metal ions would precipitate (or start to precipitate) at each of the following pH values. Indicate your…

1) A solution is made by dissolving 6.35g of glucose (C6H1206) in 25.0 mL of wat

1) A solution is made by dissolving 6.35g of glucose (C6H1206) in 25.0 mL of water. The density of water is 1.00 g/mL. Calculate the molality of the solution 2) A solution contain…

1) A solution is prepared by dissolving 19.2 g of ordinary sugar (sucrose, C12H2

1) A solution is prepared by dissolving 19.2 g of ordinary sugar (sucrose, C12H22O11, 342 g/mol) in 50.0 g of water. Calculate the boiling point of the solution. Sucrose is a nonv…

1) A solution of Na2CO3 has a pH of 10. The CO32- on is the conjugate base of th

1) A solution of Na2CO3 has a pH of 10. The CO32- on is the conjugate base of the HCO3- ion. Write the net ionic equation for the reaction which makes a solution of Na2CO3 basic. …

1) A solution of acetic acid PKA= 4.75 has a pH of 6.75, the radio of acid to co

1) A solution of acetic acid PKA= 4.75 has a pH of 6.75, the radio of acid to conjure in CH3COOH-CH3COO^++H^-. 2) the PH of blood is 7.4 while gastric juice is 1.4. How much mole …

1) A solution that is at a pH of 8 _____ solution with a pH of 1. a)has fewer hy

1) A solution that is at a pH of 8 _____ solution with a pH of 1. a)has fewer hydrogen ions than a b) has more hydrogens ions than a c) has an equal number of hydrogen ions as tha…

1) A solution that is at a pH of 8 _____ solution with a pH of 1. a)has fewer hy

1) A solution that is at a pH of 8 _____ solution with a pH of 1. a)has fewer hydrogen ions than a b) has more hydrogens ions than a c) has an equal number of hydrogen ions as tha…

1) A solution with an unknown pH causes methyl orange to turn red and also cause

1) A solution with an unknown pH causes methyl orange to turn red and also causes methyl violet to turn violet. What is the possible pH range for this solution? 2) A solution of s…

1) A standard galvanic cell is constructed with Cu 2+ | Cu + and Ni 2+ | Ni half

1) A standard galvanic cell is constructed with Cu2+|Cu+ and Ni2+|Ni half cell compartments connected by a salt bridge. Which of the following statements are correct? Hint: Refer …

1) A student determines the value of the equilibrium constant to be 1.10×10 6 fo

1) A student determines the value of the equilibrium constant to be 1.10×106 for the following reaction. 3Fe2O3(s) + H2(g) -----> 2Fe3O4(s) + H2O(g) Based on this value of Keq:…

1) A student did not heat the empty crucible in Procedure Step 2, and it retaine

1) A student did not heat the empty crucible in Procedure Step 2, and it retained some impurities or oils from previous use. So the mass of the “dirty” crucible was recorded, but …

1) A student dissolved 0.1916 g of an unknown diprotic acid in 100 mL of distill

1) A student dissolved 0.1916 g of an unknown diprotic acid in 100 mL of distilled water. The acid was then titrated with 0.1025M NaOH solution. The second equivalence point showe…

1) A student failed to clean their test tube and had an impurity that is insolub

1) A student failed to clean their test tube and had an impurity that is insoluble in water. What effect would this have on the molar mass determination ( too high, too low or no …

1) A student filled a 250 mL container with an unknown gas until a pressure of 7

1) A student filled a 250 mL container with an unknown gas until a pressure of 760 torr was obtained. The sample of gas was found to weigh 0.164 g. Calculate the molecular mass of…

1) A student forgets that the hexahydrate form of CoCl, is being used in this ex

1) A student forgets that the hexahydrate form of CoCl, is being used in this experiment and does the calculations using the molar mass of CoCla. How will that error show up in th…

1) A student forgets that the hexahydrate form of CoCl, is being used in this ex

1) A student forgets that the hexahydrate form of CoCl, is being used in this experiment and does the calculations using the molar mass of CoCla. How will that error show up in th…

1) A student found that his unknown was soluble at the boiling point of hexane,

1) A student found that his unknown was soluble at the boiling point of hexane, ethyl acetate and propanol (C3H7OH) but insoluble in water at all temperatures. What pair of solven…

1) A student is asked to standardize a solution of barium hydroxide . He weighs

1) A student is asked to standardize a solution of barium hydroxide. He weighs out 1.10 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 28.…

1) A student is asked to standardize a solution of calcium hydroxide. He weighs

1) A student is asked to standardize a solution of calcium hydroxide. He weighs out 1.01 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 27…

1) A student measures 10.00ml of an unknown solution of fe2+ into a erlenmeyer f

1) A student measures 10.00ml of an unknown solution of fe2+ into a erlenmeyer flask and diluted with 90.00ml of 1.0M hydrochloric acid. He then titrated this sample with the solu…

1) A student measures the OH- concentration in a saturated aqueous solution of s

1) A student measures the OH- concentration in a saturated aqueous solution of silver hydroxide to be 1.36×10-4 M. Based on her data, the solubility product constant for silver hy…

1) A student mixes 5.00 mL of 2.00 x 10-3 M Fe(NO3)3 with 5.00 mL of 2.00 x 10-3

1) A student mixes 5.00 mL of 2.00 x 10-3 M Fe(NO3)3 with 5.00 mL of 2.00 x 10-3 M KSCN. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 1.40 x 10-4 M a)…

1) A student performs an experiment to determine the density of a sugar solution

1) A student performs an experiment to determine the density of a sugar solution. She obtains the following results 136 g ml, 1.81 gmL 1.80 g/mL, 1.81 g/mL. If the actual value fo…

1) A student prepared a single solution and measured the %T and calculated the a

1) A student prepared a single solution and measured the %T and calculated the absorbance. Then, the student plotted the single point and, using (0,0) as a second point, drew a Be…

1) A student prepared a single solution and measured the %T and calculated the a

1) A student prepared a single solution and measured the %T and calculated the absorbance. Then, the student plotted the single point and, using (0,0) as a second point, drew a Be…

1) A student prepares a potassium dichromate solution by dissolving .5263 gram o

1) A student prepares a potassium dichromate solution by dissolving .5263 gram of dry solid potassium dichromate in enough water to make 1000.mL of solution. What is the concentra…

1) A student weighs out a 5.75 g sample of CuBr2, transfers it to a 125 mL volum

1) A student weighs out a 5.75 g sample of CuBr2, transfers it to a 125 mL volumetric flask, adds enough water to dissolve it and then adds water to the 125 mL tic mark. What is t…

1) A system loses 56.8 J of energy during a process. For each work process below

1) A system loses 56.8 J of energy during a process. For each work process below determine if the process exothermic, endothermic, or adiabatic? endo,exo, or adiabatic? it does 12…

1) A titration is a way to measure the strength of an unknownacid or base. If a

1) A titration is a way to measure the strength of an unknownacid or base. If a weak acid solution is in a beaker and it onlytakes a small amount of an unknown solution to neutral…

1) A titration is performed by adding 0.727 M KOH to 80 mL of 0.156 M HNO 3 . a)

1) A titration is performed by adding 0.727 M KOH to 80 mL of 0.156 M HNO3. a) Calculate the pH before addition of any KOH. b) Calculate the pH after the addition of 3.43, 8.59 an…

1) A useful form of the acid/base equilibrium equation is the Henderson-Hasselba

1) A useful form of the acid/base equilibrium equation is the Henderson-Hasselbalch equation. Write this equation and identify each of the quantities in this equation. 2) The equa…

1) A voltaic cell is constructed from a standard H + | H 2 half cell (E° red = 0

1) A voltaic cell is constructed from a standard H+|H2 half cell (E°red = 0.000V) and a standard Sn2+|Sn half cell (E°red = -0.140V).   The anode reaction is: The cathode reaction…