Chemistry concepts and calculations

1.) Calculate the change in pressure required to change the freezing point of a

1.) Calculate the change in pressure required to change the freezing point of a hypothetical substance, Meyerinium, by 1°C. At 357 K the heat of fusion of Meyerinium is 185 J/g. A…

1.) Calculate the cis/trans equilibrium constant for a 1,3-disubstituted cyclohe

1.) Calculate the cis/trans equilibrium constant for a 1,3-disubstituted cyclohexane compound at 6.2 Kelvin, as shown below. The A value for substituent X is 6.7 kJ/mol, while the…

1.) Calculate the energy difference (?E) for the electron transition of n = 3 to

1.) Calculate the energy difference (?E) for the electron transition of n = 3 to n = 2 for 1.00 mol of hydrogen atoms. Enter your answer in scientific notation. 2.) A lithium flam…

1.) Channel I/O is a type of non-isolated I/O because the systems are equipped w

1.) Channel I/O is a type of non-isolated I/O because the systems are equipped with separate I/O buses. 2.) Serial transfer methods can be used for time-sensitive isochronous data…

1.) Charles\' Law states that the relationship between volume and temperature of

1.) Charles' Law states that the relationship between volume and temperature of an ideal gas is direct. What would you expect a graph of volume (dependent) vs. temperature (indepe…

1.) Christopher drew a graph to show changes in the mass of Barium-122 (Ba) duri

1.) Christopher drew a graph to show changes in the mass of Barium-122 (Ba) during 10 minutes of radioactive decay. Based upon the results, what is the half-life of Barium-122 in …

1.) Christopher drew a graph to show changes in the mass of Barium-122 (Ba) duri

1.) Christopher drew a graph to show changes in the mass of Barium-122 (Ba) during 10 minutes of radioactive decay. Based upon the results, what is the half-life of Barium-122 in …

1.) Conduct research online to find an example of a hazard, critical incident or

1.) Conduct research online to find an example of a hazard, critical incident or major disaster that affected water or wastewater supplies or infrastructure facilities and systems…

1.) Consider the following chemical reaction: C(s)+H2O(g)CO(g)+H2(g) How many li

1.) Consider the following chemical reaction: C(s)+H2O(g)CO(g)+H2(g) How many liters of hydrogen gas are formed from the complete reaction of 1.10 mol of C? Assume that the hydrog…

1.) Consider the following reaction: A + 2 B + Heat C + 3 D. Based on the observ

1.) Consider the following reaction: A + 2 B + Heat C + 3 D. Based on the observations in the experiment, explain how it would be possible to shift this reaction in the forward di…

1.) Consider the following salt solutions all at the same concentration. NaHCO 3

1.) Consider the following salt solutions all at the same concentration. NaHCO3, NaCl, MgBr2, NaCN, NaNO3. Evaluate the acid/base strengths of the ions and determine: Which salt i…

1.) Consider the formation of hydrogen fluoride: H 2 (g) + F 2 (g) 2HF(g) If a 4

1.) Consider the formation of hydrogen fluoride: H2(g) + F2(g) 2HF(g) If a 4.4 L nickel reaction container (glass cannot be used because it reacts with HF) filled with 0.0067 M H2…

1.) Consider the reaction 3A 2B, where the value of K is 22.1. If the conc

1.) Consider the reaction 3A <===> 2B, where the value of K is 22.1. If the concentration of A is 0.015 at equilibrium, what is the concentration of B? 2.) For the reaction …

1.) Consider the reaction Br 2 (g) + Cl 2 (g) 2BrCl(g) Calculate the value

1.) Consider the reaction Br2(g) + Cl2(g) <===> 2BrCl(g) Calculate the value of Kp at 400?C if the partial pressures of BrCl, Br2, and Cl2 are 3.74 atm, 2.00 atm, and 1.00 a…

1.) Consider the reaction: B2H6(g) + 3O2(g) àB2O3(s) + 3H2O(g) H = -2035 kJ Calc

1.) Consider the reaction: B2H6(g) + 3O2(g) àB2O3(s) + 3H2O(g)             H = -2035 kJ Calculate the amount of heat released when each of the following amounts of diborane (B2H6)…

1.) Cu+( a q )+IO( a q )Cu2+( a q )+I( a q ) Write the balanced half-reactions E

1.) Cu+(aq)+IO(aq)Cu2+(aq)+I(aq) Write the balanced half-reactions Express your answer as a chemical equations separated by a comma. Identify all of the phases in your answer. 2.)…

1.) Describe succinctly the starting and end products of the following: glycogen

1.) Describe succinctly the starting and end products of the following: glycogenesis glycogenolysis -gluconeogenesis 2.) A person obtain from a meal 12 glucose molecules. How many…

1.) Determine the energy change (in Joules) associated with the transition from

1.) Determine the energy change (in Joules) associated with the transition from n=2 to n=4 in the Hydrogen atom. 2.) Calculate the wavelength (in nm) of the red line in the visibl…

1.) Determine the mass of ferrous ammonium sulfate hexahydrate, Fe(NH4)2(SO4)2 (

1.) Determine the mass of ferrous ammonium sulfate hexahydrate, Fe(NH4)2(SO4)2 (times) 6 H2O, required to make 250.00 mL of a 1.20 X 10^-3 M solution of Fe^+2. The molar mass of t…

1.) Determine the number of grams of sodium acetate and the amounts in mLs of 6.

1.) Determine the number of grams of sodium acetate and the amounts in mLs of 6.00M acetic acid that you would need to make 50.00mL of a sodium acetate/acetic acid buffer solution…

1.) Determine the pH of the solution when 20.00 mL of 0.1563 M aniline hydrochlo

1.) Determine the pH of the solution when 20.00 mL of 0.1563 M aniline hydrochloride (C6H5NH3+Cl-) is titrated with 15.00 mL of 0.1249 M NaOH. (Ka(aniline)=2.40 x 10-5) 2.)Conside…

1.) Determine the solubility of PbBr 2 given that Ksp= 4.67 x 10 -6 2.) The prec

1.) Determine the solubility of PbBr2 given that Ksp= 4.67 x 10-6 2.) The preceding graph shows data for the solubility of KHP. Determine H and S for this process (the dissolution…

1.) Draw the keto and enol forms of dimedone. 2.) Using the Eyring equation, com

1.) Draw the keto and enol forms of dimedone. 2.) Using the Eyring equation, compute the free energy of activation for a process for which the half life [?1/2=(ln 2)/k] is 4 s. 3.…

1.) Draw the major organic product of the reaction shown below. OH NaH You do no

1.) Draw the major organic product of the reaction shown below. OH NaH You do not have to consider stereochemistry. Include counter-ions, e.g., Na I, in your answer, but draw them…

1.) Electrolysis experiment A is run to completion with the following parameters

1.) Electrolysis experiment A is run to completion with the following parameters: The positive terminals is made of Zn, the negative terminal is made of Zn, the solution is Zn(NO3…

1.) Find the angle(in degrees) that A+B vector makes on the x-axis. A=5i+2j-k B=

1.) Find the angle(in degrees) that A+B vector makes on the x-axis. A=5i+2j-k B=-i+j+k 2.) An automoble traveling along a straight road increases its speed from 30 m/s to 50m/s in…

1.) Find the pH of 0.080 M in HNO 3 and 0.180 M in HC 7 H 5 O 2 ? 2.) Find the p

1.) Find the pH of 0.080 M in HNO3 and 0.180 M in HC7H5O2? 2.) Find the pH of 0.025 M in HBr and 0.020 M in HClO4 3.) Find the pH of 0.095 M in HF and 0.230 M in HC6H5O 4.) Find t…

1.) Find w rev (in units of J) for the following multi-step compressions(or expa

1.) Find wrev (in units of J) for the following multi-step compressions(or expansions): Give your answer in Joules with zero decimal places.-- I got 146J but apparently thats wron…

1.) For 0.100 M of weak acid (propanoic acid HPr) the Kais given by 1.30 x10 -5

1.) For 0.100 M of weak acid (propanoic acid HPr) the Kais given by 1.30 x10-5 , calculate the pH ofthe sample. 2.) For 0.250 M of weak acid (NaHS) the Kb is given by 1.22x10-13 ,…

1.) For Kinetic Trial 2, Alicia was distracted when the color change occurred bu

1.) For Kinetic Trial 2, Alicia was distracted when the color change occurred but decided to record the time lapse read from her watch. Will this distraction cause an increase or …

1.) For the following reaction, the equilibrium constant Kc is 2.0 at a certain

1.) For the following reaction, the equilibrium constant Kc is 2.0 at a certain temperature. If the concentration Of both products is 0.10 M at equilibrium, what is the concentrat…

1.) For the reaction D A + C when 1/[D] is plotted versus the time in seconds, a

1.) For the reaction D A + C when 1/[D] is plotted versus the time in seconds, a straight line is obtained whose slope is 0.054 M-1s-1. What is the concentration of D (in M) after…

1.) For the reaction, calculate how many moles of the product form when 0.032mol

1.) For the reaction, calculate how many moles of the product form when 0.032mol of K completely reacts. Assume that there is more than enough of the other reactant. 4K(s)+O2(g)?2…

1.) For the reaction: 2Br (g) -> Br 2(g) Kp=0.0004 at 4000K. What is the value o

1.) For the reaction: 2Br(g) -> Br2(g) Kp=0.0004 at 4000K. What is the value of Kc at the same temperature? What is the equilibrium concentration of Br2 if the reaction was sta…

1.) Formic acid, HFor, has a Ka value equal to about 1.8*10^-4. A student is ask

1.) Formic acid, HFor, has a Ka value equal to about 1.8*10^-4. A student is asked to prepare a buffer having a pH of 3.90 from a solution of formic acid and a solution of sodium …

1.) Gas Number of moles N2 3.10 O2 0.76 CO2 0.12 If the total pressure is 1.07 a

1.) Gas           Number of moles N2                    3.10 O2                    0.76 CO2                 0.12 If the total pressure is 1.07 atm, what is the partial pressure of…

1.) Gaseous hydrogen and oxygen can be prepared in the laboratory from the decom

1.) Gaseous hydrogen and oxygen can be prepared in the laboratory from the decomposition of gaseous water. The equation for the reaction is 2H2O(g)====>2H2(g)+O2(g) Calculate h…

1.) Give the mechanism for the main D-A reaction, preparation of I 2.) Give the

1.)  Give the mechanism for the main D-A reaction, preparation of I 2.)  Give the mechanism for the cracking of dicyclopentadiene, preparation of II 3.)  How was the favored react…

1.) Given the following balanced chemical equation for the titration of oxalate

1.) Given the following balanced chemical equation for the titration of oxalate ion with permanganate ion:                  6H+ + 2MnO4- + 5C2O42- --> 2Mn+  + 10CO2 + 8H2O     …

1.) Given the following balanced chemical equation for the titration of oxalate

1.) Given the following balanced chemical equation for the titration of oxalate ion with permanganate ion:                  6H+ + 2MnO4- + 5C2O42- --> 2Mn+  + 10CO2 + 8H2O     …

1.) Given: int array[6] = { 3, 5, 8, 2}; Question 1 options: Only four elements

1.) Given: int array[6] = { 3, 5, 8, 2}; Question 1 options: Only four elements in the array are initialized. None of the array elements are initialized. All elements are initiali…

1.) How many ? bonds and ? bonds does the CO2 molecule have? 2.)Which of the fol

1.) How many ? bonds and ? bonds does the CO2 molecule have? 2.)Which of the following is not a valence bond concept? c.) A pair of electrons in a bond is shared by both atoms. d.…

1.) How many grams of aluminum sulfate, Al 2 (SO 4 ) 3, are needed to precipitat

1.) How many grams of aluminum sulfate, Al2(SO4)3, are needed to precipitate 75.5 grams of solid calcium sulfate, CaSO4, in the following reaction. (Use Mole Ratio) Al2(SO4)3(aq) …

1.) How many milliliters of carbon dioxide gas at STP are produced from the deco

1.) How many milliliters of carbon dioxide gas at STP are produced from the decomposition of 5.50g of ferric carbonate? Fe_2 (CO_3 )_3 (s) ightarrow Fe_2 O_3 (s) + 3 CO_2 (g) 2.) …

1.) How many milliliters of carbon dioxide gas at STP are produced from the deco

1.) How many milliliters of carbon dioxide gas at STP are produced from the decomposition of 5.50g of ferric carbonate? Fe_2 (CO_3 )_3 (s) ightarrow Fe_2 O_3 (s) + 3 CO_2 (g) 2.) …

1.) How many moles of Fe 3+ can be reduced by 1 mL of 0.421 M hydroxylamine solu

1.) How many moles of Fe3+ can be reduced by 1 mL of 0.421 M hydroxylamine solution? 2.) The trendline equation calculated from a calibration curve of absorbance vs iron concentra…

1.) Identify the most important types of interparticle forces present in the sol

1.) Identify the most important types of interparticle forces present in the solids of each of the following substances: A) BaSO4 B) H2S C) Xe D) C2H6 E) CsI F) P4 G) NHs 2.) In e…

1.) If 2.86 moles of nitrogen reacts with 4.27 moles of hydrogen, what is the ma

1.) If 2.86 moles of nitrogen reacts with 4.27 moles of hydrogen, what is the maximum volume of ammonia (in L) that can be produced at a pressure of 1.14 atm and 301 K. N2(g) + 3 …

1.) If a buffer solution is 0.110 M in a weak base (Kb = 5.7 × 10-5) and 0.590 M

1.) If a buffer solution is 0.110 M in a weak base (Kb = 5.7 × 10-5) and 0.590 M in its conjugate acid, what is the pH? 2.) You need to prepare 100.0 mL of a pH=4.00 buffer soluti…

1.) If everyone in the world planted a tree today, how long would it take for th

1.) If everyone in the world planted a tree today, how long would it take for these trees to decrease the concentration of CO2 by 1 ppm? Assume that 9 kg of O2 is produced per tre…