Chemistry concepts and calculations
117302 questions • Page 2159 / 2347
a) What combination of a molecular base and a salt of the conjugate acid of the
a) What combination of a molecular base and a salt of the conjugate acid of the chosen molecular base should you select to prepare a buffer solution that would maintain a pH of 10…
a) What does the deltaE of crystal field theory have to do with color? b) How do
a) What does the deltaE of crystal field theory have to do with color? b) How does the concept of electron pairing energy? c) Why are all known tetrahedral complexes only of the h…
a) What effect on the boiling point of a liquid is produced by the presence of a
a) What effect on the boiling point of a liquid is produced by the presence of a fully miscible liquid impurity of lower boiling point? b) When carrying out an atmospheric pressur…
a) What is Active Directory? b) What is an AD domain? c) What are domain control
a) What is Active Directory? b) What is an AD domain? c) What are domain controllers? d) Can a domain have more than one domain con…
a) What is G rxn o (in kJ) at 2715 K for the following reaction? 2POCl 3 (g) 2PC
a) What is Grxno (in kJ) at 2715 K for the following reaction? 2POCl3(g) 2PCl3(g) + O2(g) POCl3(g): Hfo = -592.7 kJ/mol and Sº = 324.6 J/K mol) PCl3(g): Hfo = -287.0 kJ/mol and Sº…
a) What is the K sp for the lithium tetraborate if50 mL of a saturated solution
a) What is the Ksp for the lithium tetraborate if50 mL of a saturated solution of lithium tetraborate requires9.11mL of 0.511 M HCl to titrate the tetraborate? b) Based on the Ksp…
a) What is the cell potential for the following standard cell? Cr(s) / Cr(NO3)3
a) What is the cell potential for the following standard cell? Cr(s) / Cr(NO3)3 // SnCl2, SnCl4 / Pt(s) b) Do you expect this cell to have a
a) What is the cell potential for the following standard cell? Cr(s) / Cr(NO3)3
a) What is the cell potential for the following standard cell? Cr(s) / Cr(NO3)3 // SnCl2, SnCl4 / Pt(s) b) Do you expect this cell to have a
a) What is the concentration of the dye in a solution with a percent transmittan
a) What is the concentration of the dye in a solution with a percent transmittance reading of 45.8% at 640 nm? b) If the solution in part a was made by taking 20.00 mL of a stock …
a) What is the density (in kilograms per cubic meter) of moist air at 25oC, a pr
a) What is the density (in kilograms per cubic meter) of moist air at 25oC, a pressure of 1000 mb and vapor pressure of 25 mb? b) What is the saturated vapor pressure (in Pa) at a…
a) What is the one letter code for the amino acid at the N-terminus of the pepti
a) What is the one letter code for the amino acid at the N-terminus of the peptide? b) What is the one letter code for the amino acid at the C-terminus of the peptide? c) Using th…
a) What is the osmotic pressure in bar of a 0.10 M solution of urea in ethanol ?
a) What is the osmotic pressure in bar of a 0.10 M solution of urea in ethanol ? b) What is the osmotic pressure in bar of a 0.10 M solution of NaCl in water ? c) An aqueous solut…
a) What is the pH of 0.44 M triethylammonium iodide, (C 2 H 5 ) 3 NHI. The K b o
a) What is the pH of 0.44 M triethylammonium iodide, (C2H5)3NHI. The Kbof triethylamine, (C2H5)3N, is 5.2 x 10-4 b) Calculate the pH of a 0.10 M solution of sodium formate (NaHCOO…
a) What is the pH of a buffer prepared by adding 0.607 mol of the weak acid HA t
a) What is the pH of a buffer prepared by adding 0.607 mol of the weak acid HA to 0.507 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66×107. Express t…
a) What is the pressure exerted by 0.801 mol of CO2 in a 13.0 L container at 298
a) What is the pressure exerted by 0.801 mol of CO2 in a 13.0 L container at 298 K? Express your answer in atm. b) A sample of 88.0 g CO2 is held at 291 K in a 40.0 L container. W…
a) What is the recommended daily allowance (RDA) of calcium, in mg, assuming a 2
a) What is the recommended daily allowance (RDA) of calcium, in mg, assuming a 2000 calorie diet for a 25 year old adult? b) A student carries out part 1 of this experiment and fi…
a) What is the strength and limitation od the four methods for finding the roots
a) What is the strength and limitation od the four methods for finding the roots of equations: (1) the graphical method; (2) the bisection method; (3) the simple (one-point) itera…
a) What order of kinetics does this follow (show your work)? b) What fraction of
a) What order of kinetics does this follow (show your work)? b) What fraction of Polonium 210 would remain after one year? c) Polonium has occasionally been implicated in high pro…
a) What type of inhibition is mediated by [I], as determined by evaluation of a
a) What type of inhibition is mediated by [I], as determined by evaluation of a double-reciprocal plot (Lineweaver-Burke)? How do you know? b) Conceptually, how is the inhibitor i…
a) What volume of 10.0 M N a O H is needed to prepare a buffer with a p H of 7.7
a) What volume of 10.0 M NaOH is needed to prepare a buffer with a pH of 7.79 using 31.52 g of TrisHCl? Answer: 6.7 mL is needed to prepare buffer with pH of 7.79 b)The buffer fro…
a) What volume of a 0.180 M nitric acid solution is required to neutralize 22.4
a) What volume of a 0.180 M nitric acid solution is required to neutralize 22.4 mL of a 0.172 M barium hydroxide solution? (Answer should be in mL) b)What volume of a 0.154 M calc…
a) What volume of a 0.180 M nitric acid solution is required to neutralize 22.4
a) What volume of a 0.180 M nitric acid solution is required to neutralize 22.4 mL of a 0.172 M barium hydroxide solution? (Answer should be in mL) b)What volume of a 0.154 M calc…
a) What volume of a 6.40 M stock solution do you need to prepare 500. mL of a 0.
a) What volume of a 6.40 M stock solution do you need to prepare 500. mL of a 0.0347 M solution of HNO3? b) The absorbance of a cationic iron(II) sample solution was measured i…
a) What volume of boiling solvent is needed to dissolve .65g of sulfanilamide? b
a) What volume of boiling solvent is needed to dissolve .65g of sulfanilamide? b) Using the amount from a) how much sulfanilamide will crystallize after cooling to 20oC? c) After …
a) When 0.250 moles of a gas is placed in a container at 25 °C, it exerts a pres
a) When 0.250 moles of a gas is placed in a container at 25 °C, it exerts a pressure of 700 mmHg. What is the volume of the container? (R = 0.0821 L.atm/mol.K) b) An 18 liter cont…
a) When 25.0 mL of a 1.49×10 -4 M potassium hydroxide solution is combined with
a) When 25.0 mL of a 1.49×10-4M potassium hydroxide solution is combined with 25.0 mL of a 4.16×10-4M manganese(II) iodide solution does a precipitate form? (yes or no) For these…
a) When 7.92 g of an unknown non-electrolyte is dissolved in 50.0 g of water, th
a) When 7.92 g of an unknown non-electrolyte is dissolved in 50.0 g of water, the boiling point increased by 0.5 degrees C. If the Kbp of the solvent is 0.512 K/m, calculate the m…
a) When 7.92 g of an unknown non-electrolyte is dissolved in 50.0 g of water, th
a) When 7.92 g of an unknown non-electrolyte is dissolved in 50.0 g of water, the boiling point increased by 0.5 degrees C. If the Kbp of the solvent is 0.512 K/m, calculate the m…
a) When a 15.5 g sample of potassium chlorate dissolves in 100.0g of water in a
a) When a 15.5 g sample of potassium chlorate dissolves in 100.0g of water in a calorimeter, the temperature of the water/solution drops from 25.0 degrees celcius to 13.7 degrees …
a) When heated, calcium carbonate decomposes to yield calcium oxide and carbon d
a) When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction CaCO3(s)CaO(s)+CO2(g) What is the mass of calcium carbonate needed to p…
a) When the following skeletal equation is balanced under basic conditions, what
a) When the following skeletal equation is balanced under basic conditions, what are the coefficients of the species shown? __Si + __ MnO2 ---> ___ Mn(OH)2 + ___ SiO32- Water …
a) Which atoms are nucleophilic centers? b)Which atoms are electrophilic centers
a) Which atoms are nucleophilic centers? b)Which atoms are electrophilic centers? etc... For each of the reactions shown below use the atom numbers to answer questions about the r…
a) Which column has more theoretical plates? (b) which column has a larger plate
a) Which column has more theoretical plates? (b) which column has a larger plate height? ch Which column gives higher resolution? (d) Which column gives a greater relative retenti…
a) Which electrons experience a greater Z eff (effective nuclear charge): the va
a) Which electrons experience a greater Zeff (effective nuclear charge): the valence electrons in Be or the valence electrons of N? Why? Using the simple equation on page 260, cal…
a) Which is most soluble in water, benzene (C6H6) or ethanol (C2H5OH). Benzene b
a) Which is most soluble in water, benzene (C6H6) or ethanol (C2H5OH). Benzene because it can form London forces with water molecules. Benzene because it can form dipole-dipole in…
a) Which of the following compounds is most likely to exhibit ionic bonding? A.
a) Which of the following compounds is most likely to exhibit ionic bonding? A. BrCl B. H2O C. NH3 D. LiBr E. BH3 F. PCl5 b…
a) Which of the two of the following compounds would you mix to make a buffer of
a) Which of the two of the following compounds would you mix to make a buffer of pH 7.45 phosphoric acid (FM=98.00), sodium dihydrogen phosphate (FM=119.98), disodium hydrogen pho…
a) Which table is the primary table and which table is the secondary table in th
a) Which table is the primary table and which table is the secondary table in the one-to-many relationship? b) What will happen if you attempt to add a new Book Rep with BR# of 75…
a) Which table is the primary table and which table is the secondary table in th
a) Which table is the primary table and which table is the secondary table in the one-to-many relationship? b) What will happen if you attempt to add a new Book Rep with BR# of 75…
a) Which two of the following are functions of the RNA polymerase ? subunit? b)
a) Which two of the following are functions of the RNA polymerase ? subunit? b) How would transcription be affected if the ? subunit were part of the ?2?? ' core? c) Which would y…
a) While in Europe, if you drive 117 km per day, how muchmoney would you spend o
a) While in Europe, if you drive 117 km per day, how muchmoney would you spend on gas in one week if gas costs 1.10 eurosper liter and your car's gas mileage is 42.0 mi/gal? Assum…
a) Why are microwave repeaters needed? b) Does the uplink or the downlink use po
a) Why are microwave repeaters needed? b) Does the uplink or the downlink use point-to-point transmission? c) What is the footprint? …
a) Will the specific heat of 50g of a substance be thesame or greater than the s
a) Will the specific heat of 50g of a substance be thesame or greater than the specific heat of 10g of the samesubstance? b)Using calories, calculate how much heat 32.0g of watera…
a) Would it be possible to separate hexane(boiling point: 68.95 o C) from toluen
a) Would it be possible to separate hexane(boiling point: 68.95 oC) from toluene (bp:110.6oC) by simple distillation? Explain youranswer. For this question, I tried to look up the…
a) Write a balanced chemical equation for the complete combustion of heptane. b)
a) Write a balanced chemical equation for the complete combustion of heptane. b) Calculate the volume (in liters) of air at 34 degrees Celsius and 0.s atmosphere that is completel…
a) Write a balanced chemical equation for the complete combustion of heptane. b)
a) Write a balanced chemical equation for the complete combustion of heptane. b) Calculate the volume (in liters) of air at 34 degrees Celsius and 0.s atmosphere that is completel…
a) Write a balanced equation for the combustion of butane gas. b) If at a given
a) Write a balanced equation for the combustion of butane gas. b) If at a given moment butane is reacting at a rate of 0.400 mol L?1s?1, what are the rates of formation of product…
a) Write a balanced equation for the combustion of butane gas. b) If at a given
a) Write a balanced equation for the combustion of butane gas. b) If at a given moment butane is reacting at a rate of 0.400 mol L?1s?1, what are the rates of formation of product…
a) Write a detailed mechanism for the depletion of ozone in the stratosphere wit
a) Write a detailed mechanism for the depletion of ozone in the stratosphere with CFC compounds such as CCl3F. (b) The bromination of 1-bromopropane gives the following products. …
a) Write the balanced chemical equation for the complete combustion of 1 mole of
a) Write the balanced chemical equation for the complete combustion of 1 mole of liquid methanol (CH3OH) to carbon dioxide (CO2 (g)) and water (H2O(g)). (b) Using the data given, …
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