Chemistry question and answers for August 07, 2023
- Q Using S? values from Appendix C in the textbook, calculate ?S?values for the following reactions. 5 significant figuresplease!!!C2H4(g)+H2(g)?C2H6(g)N2O4(g)?2NO2(g)Be(OH)2(s)?BeO(s)+H2O(g)2CH3OH(g)+3O2(g)?2CO2(g)+4H2O(g)
- Q sodium azide (65.01 g/mol) energetically decomposes togive sodium metal and nitrogen gas. according to the eguation :2NaN3 (s)\rightarrow 2 Na (s) + 3 N2 (g) . what the mass of...
- Q Inthe reaction of copper with potassium dichromate and sulfuric acid,the products are copper (1) sulfate, potassium sulfate, water, andchromium(III) sulfate. First, write a balanced net ionic equationfor this reaction. Then...
- Q Consider the hydrocarbons whose structures are listed below.Which of these molecules would be planar, meaning that all of theatoms must always lie in the same plane? Explain your answer interms...
- Q On the basis of your research, respond to the following: What isthe difference between biochemical, pharmaceutical, and diagnosticchemical reactions in healthcare? What is a specific example thatexists for each of...
- Q Calculate pBa when 50.00 mL of 0.100 M EDTA is added to 50.00 mLof 0.100 M Ba2+. For the buffered pH of 10, the fraction of EDTA inits fully deprotonated...
- Q The molar concentration of HCL in a solution used to removeboiler scale from plumbing can be determined by titration with aNaOH solution.10 ml. of the HCL solution is placed in...
- Q A weak base, B, (Kb=1.0 *10-7) equilibrates between water (phase 1)and benzene (phase2). a) Define the distribution coefficient forthis system b) Explain the difference between the partitioncoefficient, K, and the...
- Q Consider the following peptide:Cys-Arg-Pro-Asp-Thr-Leu-His-Lys-Gln-Glu-HisHow is the peptide different at pH = 6and pH 8? Which of the two pHs would you use to run an ion exchangecolumn, and would you...
- Q Describe the different type of transformations that can becarried out using enzymes
- Q Your book describes a treatment for -Thalassemia, a diseasewhere the body cannot make the form of hemoglobin. Transfusions arenecessary to provide the body with external sources ofï¢ï€hemoglobinbut that procedure causes...
- Q 1. Give the best product of the following reaction:HBr excessA. B. C. D. E. Br Br Br Br Br Br Br2. What configurations are found in the product(s) of thereaction...
- Q How much heat is released when 85.0 g of steam at 100.0°C iscooled to ice at -15.0°C? The enthalpy of vaporization of water is40.67 kJ/mol, the enthalpy of fusion for...
- Q Ignoring activities, determine the molar solubility (S) ofZn(CN)2 in a solution with a pH = 1.34. Ksp (Zn(CN)2) = 3.0 ×10-16; Ka (HCN) = 6.2 × 10-10.
- Q A0.204-g sample of a CO3 antacid is dissolved with 25.0 mL of 0.0981M HCL. The hydrochloric acid that is not neutralized by the antacidis titrated to a bromophenol blue endpoint...
- Q An unknown compound contains only C, H, and O. Combustion of6.10 g of this compound produced 14.9 g of CO2 and 6.10 g of H2O.What is the empirical formula of...
- Q Barium chloride and potassium carbonate combine to form bariumcarbonate and potassium chloride. The equation for this chemicalreaction is shown below.BaCl2 + K2CO3-->BaCO3 + KCl
- Q The following data was collected in a laboratory experimentconducted at 305.2 K.A.) Determine the complete rate law for this simple chemicalprocess A → BTimeConcentration04.8040.53.2679919112.2798015881.51.57313740421.0474546862.50.71365016130.524229893.50.36655179840.2181813354.50.18369947850.1325088965.50.09732615860.0331454396.50.03652629170.0051041287.50.01725379880.011858358.50.00815011790.0256014889.50.016150157100.00264595610.50.018181463110.01875013911.50.020859016120.02059039312.50.01959423130.01972111813.50.000191672140.00013173414.50.01990946150.019937773B.) For the set of kinetic data...
- Q Answer the following questions based on the reaction: K2CrO4 +AgNO3 ---> red solid. A: What is the formula for the solidproduced? B: Using the reaction above, a chemestry student has...
- Q Part ACalculate the pH in 1.00MCH3CO2H.Part BCalculate the concentrations of all species present (H3O+,CH3CO2?, CH3CO2H, and OH?) in 1.00M CH3CO2H.
- Q Using electronegativity arguments, classify the followingdiatomic molecules as nonpolar (N), polar (P), or ionic (I).NaFGaAsH2RbOCO
- Q Describe why high pressures but low temperatures causesubstances to deviate from ideal gas conditions. Make sure todiscuss the assumptions we made to come to the ideal gas law andhow high...
- Q A 0.380 m aqueous solution of NaCl is prepared at 20.0∘C. Assumethat the density of the solution at 20.0∘C is 1.082 g/mL.Calculate the molarity of the salt solution.
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.170 M HClO(aq) with 0.170 M KOH(aq).(a) before addition of any KOH(b) after addition of...
- Q for a linear molecule of polyethelyne of molar mass 11980 g mole^- calculate :The contour length of the moleculeB) the end to end distance in thr fully extended moleculeandC) the...
- Q Match each element with the full ground-state electronconfiguration of the monatomic ion it is most likely to form.(Enter the 6 correct letters, in order: BABCEG, FBAGCC, etc.).1) K A. 1s22s22p63s23p64s12)...
- Q please show the answer in steps.1)What is the change in entropy when a) 100 g of ice is meltedat 0 ℃ b) 100 g of water is vaporized to 100...
- Q How many liters of methanol would be required daily to removethe nitrogen from a 200,000-L/day sewage treatment plant producingan effluent containing 50 mg/L of nitrogen? Assume that thenitrogen has been...
- Q Suppose we titrate 20.0 mL of 0.20 M of formic acid (HCHO2, Ka=1.8 x 10^-4) with 0.20 M KOH. Calculate the pH for thefollowing:a) before any base is addedb) when...
- Q 1. a)Which of the following statements are TRUE for a buffersolution.Select all that are True._ A buffer can be prepared by combining a weak acid and itsconjugate base.\"_ A buffer...
- Q Some people have an allergic reaction to the food preservativesulfite (SO32−). Sulfite in wine was measured by the followingprocedure: To 50.0 mL of wine were added 5.00 mL of solutioncontaining...
- Q Starting from a symbolic expression of the Second Law ofThermodynamics, show how arguments based purely upon considerationsof entropy lead to the formalism which we call Gibbs
- Q How to convert 100 micrograms per milliliter to 10nanomolar?
- Q why does the measurement of fluorescence data requirea more intense source of uv/visible spectroscopy? specific. b) whatis the typical source for spectofluorometer? c) for thephotomuiltiplier transducer what is the mode...
- Q A 0.1936 gram sample of primary standard K2Cr2O7 was dissolvedin water, the solution was acidified, and after the addition of KI,the titration of liberated I2 required 33.61 ml of Na2S2O3solution....
- Q The data to the below were collected for the bovine carbonicanhydrase-catalyzed reaction described byCO2 (aq) + H2O (l) -->H+ (aq) + HCO3- (aq)[CO2] (mmol * L^-1)R (õmol * L^-1 *...
- Q 1.20 g of an unknown liquid is placed into a 2.3 L containerunder vacuum. (No gases present.) The liquid completely evaporatesat 25.03°C and becomes a gas with a pressure of...
- Q Calculate the fugacity and fugacity coefficient of saturated liquidwater at 25 degrees.
- Q Construct a table to show how to make the standard solutionsfrom serial dilution, starting with a stock solution of 1000 ppm in100 mL volumetric flask.Use 1000 ppm standard soltuions of...
- Q Using Crystal Field Theory explain how d orbital splittingarises in an octahedrarl field.
- Q Why would atomic absorption spectroscopy be less sensitive tolow source temperature, assuming efficient atomization?
- Q 1.2 Which strategy is not a viable “green†option in thechemical industry?(a) Using catalysts to reduce energy consumption(b) Reducing the number of steps in a multistep synthesis(c) Maximizing yield(d) Running...
- Q The heat energy associated with a change in temperature thatdoes not involve a change in phase is given byq=msΔTwhere q is heat in joules, m is mass in grams,s is...
- Q Classify each of the following as strong electrolytes, weakelectrolytes or nonelectrolytes.NaClNaHCO3C12H22O11Na2CO3CaCO3HC2H3O2C3H6O
- Q Chloroform, CHCl3, is formed by the following reaction:CH4(g) + 3 Cl2(g) → 3 HCl(g) + CHCl3 (g)Determine the enthalpy change for this reaction (ΔH°rxn), usingthe following:enthalpy of formation of CHCl3...
- Q A buffer that contains 0.16 M of a base, B and 0.27 M of itsconjugate acid BH+, has a pH of 8.56. What is the pH after 0.02 molof Ba(OH)2...
- Q A solution is prepared using a sodium salt of an unknowndiprotic base. The unknown diprotic weak base solution will beanalyzed for concentration by titration with a strong acid. Theunknown is...
- Q The photoionization of O2 produces O2+. Would you expect higherintensity for 0-0 or 0-2 transitions?
- Q Determine the term symbols for :A) 3P2 , B) s1p1d1electron configuration.C) Determine the energy free ion spectroscopic state (groundstate) of a d3 species.
- Q Ingeneral, why can activity be different from concentration? Simply.Under what circumstances is activity equivalent toconcentration??Under what circumstances is it noticeably different??
- Q Describe the 13C NMR spectrum of2-methylcyclohexanol.
- Q Answer the following for the reaction:Pb(NO3)2(aq) + 2KCl (aq) ⟶ PbCl2(s) +2KNO3(aq)a) How many grams of PbCl2 will be formed from 50.0 mL of a 1.50M KCl solution?b) How many...
- Q The reaction between sulfur gas (S2) and carbon (C)at high temperatures (900C) results in the formation of carbondisulfide (CS2). The reaction is: C(s) +S2(g) = CS2(g). What is the concentration...
- Q In a titration of 40.55 mL of 0.3137 M nitrous acid with 0.3137M aqueous sodium hydroxide, what is the pH of the solution when40.55 mL of the base have been...
- Q Solid sodium reacts with water to produce aqueous sodiumhydroxide (NaOH) and molecular hydrogen gas. Determine the limitingreactant if 8.21 grams of sodium are reacted with 6.98 grams ofwater.
- Q I. Does the solubility of the solute increase or decrease ineach of the following situations?1. Ice is placed in a glass of cola (solute is CO2 gas).2. Honey is dissolved...
- Q Calculate the pH during the titration of 20.00 mL of 0.1000 Mhydrazine, NH2NH2(aq), with 0.2000 M HBr(aq) after 3.5 mL of theacid have been added. Kb of hydrazine = 1.7...
- Q A 19.57 g mixture of sugar (C12H22O11) and table salt (NaCl) isdissolved in 223 g of water. The freezing point of the solution wasmeasured as -3.85 °C. Calculate the mass...
- Q Part A MX (Ksp = 3.97×10−36)S = _____ MPart B Ag2CrO4 (Ksp = 1.12×10−12) Express your answer in molesper liter.S = _____ MPart C Ni(OH)2 (Ksp = 5.48×10−16) Express your...
- Q Use Slater's Rules to calculate Z* forA. 3p electron in the element PB. 4s electron in CoC. 3d electron in Mn
- Q Contrast the reaction to form biodiesel with the reaction toform soap. Why do they form different products given that bothreactions start out with a base and a fat or oil?
- Q Experimental Organic Chemistry 1HPLC Questions- What's the difference between single point calibrations andfive point calibrations?- How could you improve your resolution on a chromatograph?- What's the difference between isocratic runs...
- Q (b) Which have a molecular dipole moment? (Select all thatapply.)CF4BF3PF3OF2F2
- Q 3a. If the molar absorptivity constant for the red dye solutionis 5.56×104 M-1 cm-1 , calculate the molarity of the red dyesolution with absorption = 0.900. You may assume L...
- Q Calculate the pH during the titration of 20.00 mL of 0.1000 MC6H5OH(aq) with 0.1000 M NaOH(aq) after 19.9 mL of the base havebeen added. Ka of phenol = 1.0 x...
- Q Define the followings.(a) collision flux(b) Stokes law(c) Fick's second law(d) Einstein-Smoluchowski equation(e) half-life of a first-order reaction(f) Forster theory of resonance energy transfer(g) Mechaelis-Menten mechanism
- Q 10) . Use the principles that you learned in Part ii tocalculate the standard reduction potentials for each half-cell,given that the E° for Cu2+ + 2e- ïƒ Cu (s) is...
- Q Experimental Organic Chemistry 1-How do you know when you should use GC or HPLC?-What's the difference between Reverse Phase HPLC and NormalPhase HPLC?
- Q If a solution containing 84.670 g of mercury(II) nitrate isallowed to react completely with a solution containing 12.026 g ofsodium sulfide, how many grams of solid precipitate will beformed?How many...
- Q Which pair of aqueous solutions is given in order of increasingfreezing point?(1) 0.010m Na3PO4 < 0.030m NaCl(2) 0.020m NaI < 0.030m glucose(3) 0.010m CaCl2 < 0.020m KCl(4) 0.010m Na3PO4 <...
- Q Which of the following is likely to have the greatest exothermichydration enthalpy? A) Sr2+ B) Na+ C) Mg2+ D) Ca2+ E) K+
- Q Using Excel, calculate a titration curve for a weak acid with apKa of 3.57 with astandardized NaOH solution of 0.1138 M. This curve should have aminimum of 20calculated points; 15...
- Q Iron reacts with chlorine gas according to the followingbalanced chemical equation:2Fe(s)+3Cl2(g)→2FeCl3(s)A) What mass of iron(III) chloride is produced when 101.08 giron reacts with 185.42 g chlorine gas?B) What is the...
- Q A bottle filled with 0.5 L of an aqueous solution is atequilibrium with the gas containing 70 % (mole fraction) ofnitrogen, N2, and 30 % of oxygen, O2. The temperature...
- Q Consider the titration of 40.0 mL of 0.200 M HClO4 by 0.100 MKOH. Calculate the pH of the resulting solution after the followingvolumes of KOH have been added. a. 0.0...
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