Chemistry question and answers for July 08, 2023
- Q O3 + O -->2O2)Depletion of the ozone layer is believed to be caused by chlorinecatalyzed O3 decomposition. For the uncatalyzed reaction Ea,f= 19kJ/mol. For the following mechanism, Ea1, f =2.1...
- Q Calculate the pH of a 0.100M NaCH3COO solution. Kafor acetic acid, HC2H3O2 is1.8x10-5
- Q In the manufacture of an activepharmaceutical ingredient (API), the API goes through a finalpurification step in which it is crystallized , filtered, andwashed. The washed crystals contain 47 wt% water....
- Q Determine Kb for the nitrite ion, NO2-. In a 0.10-M solution,this base is 0.0015% ionized.
- Q A mole of air is sampled from the atmosphere when theatmospheric pressure is 765 mm Hg, thetemperature is 25 C, and relative humidity is 75%. The sample ofair is placed...
- Q A 5.00 ml sample of blood was treated with trichloroacetic acidto precipitate proteine. After centrifugation, the resultingsolution was brought to a PH of 3 and was extracted with two 5-ml,portions...
- Q From the equilibrium concentrations given, calculate Ka for eachof the weak acids and Kb for each of the weak bases.c) HCO2H[HCO2H]= 0.524 M[H3O+]= 9.8 x 10^-3 M[HCO2-] 9.8 x 10^-3d)...
- Q the protein xpot transports all tRNAs out of the nucelus so thatthey can be aminoacylated in the cytosol.a) What tRNA structural feature is Xpot likely to recognize?b) Why might it...
- Q Ammonia gas enters the reactor of a nitric acid plant mixed with30% more dry air than is required for the complete conversion ofthe ammonia to nitric oxide and water vapor....
- Q In the laboratory you dissolve 18.6 g ofpotassium carbonate in a volumetric flask and addwater to a total volume of 500mL.  What is the molarity of the solution?   M.What is the concentration...
- Q How many mL of 0.200 M HBr acid would be needed to neutralize50.0 grams of calcium hydroxide solid that is completely dissolvedin enough water to make 500. mL of solution?
- Q Calculate the pH after 0.16 mole of NaOH is added to 1.10 L of asolution that is 0.58 M HCO2H and 1.12 M HCO2Li, and calculate thepH after 0.32 mole...
- Q Calculate the pH of the solution after the addition of thefollowing amounts of 0.0615 M HNO3 to a 50.0 mL solution of 0.0750M aziridine. The pKa of aziridinium is 8.04.a)...
- Q 1.Give a full experimental discussion in using ;Sodium borohydrideto reduce ketone(Benzophenone solid) to the corresponding alcohol .2.what are the major observations in this experiment,pleasestate and explain them.3.State possible errors in...
- Q You are an experimental psychologist interested in finding outhow effective a new medication might work for treating depression.Describe a study you might conduct to reach some conclusions onthis matter. Be...
- Q A method for determination of the second virial coefficient of apure gas is based on the Clapeyron equation and measurements of thelatent heat of vaporization (ΔHlv), the molar volume ofsaturated...
- Q 2PbS(s)+3O2(g)→2PbO(s)+2SO2(g) Sulfur dioxide can then reactwith oxygen in air to form sulfur trioxide. Classify this reactionas a synthesis, decomposition, single-displacement, ordouble-displacement reaction.
- Q a strip of Ag was placed in a beaker containing 1.0 M AgNO3, anda strip of Co was put in a second beaker containing Co(NO3)2. Thesilver and cobalt electrodes were...
- Q Consider the following two solventsSolubilitySolvent A 52g of product in 100mL at 100celcius; 29g of product in 100mL at 25 celciusSolvent B 8.1g of product in 100mL at 100celcius; 0.91g...
- Q Useful Information: The 25.0 wt % ethylenediamine solutioncontains 25.0 % ethylenediamine by mass, dissolved in water, andhas a density of 0.950 g/mL. First calculate the mass of the C2H8N2solution from...
- Q if 45.55ml of 0.0105M EDTA solution was needed totitrate the Mg in a 0.2600g sample of the mineral hydromagnesite,3MgCO3Mg (OH)2• 3H2O (365.3 g/mol), what was the weight percent ofhydromagnesite in...
- Q Illustrate themass spectrum of ammonia (gas) ionized by electron impact (EI)using 70 eV electronsand Illustrate the spectrum for 12 eV electrons.What form of NMR might be used to characterize ammonia?Illustrate...
- Q Add the physical state for each substance in the following aqueousreactions. Then write and balance a net ionic equation for eachreaction.(a)Cr2(SO4)3+KOH→Cr(OH)3+K2SO4  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)AP 17(b)K2CrO4+PbCl2→KCl+PbCrO4  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)AP 34(c)Na2SO3+H2SO4→Na2SO4+H2O+SO2  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)  (aq)  (s)  (g)  (l)AP 55
- Q 1. It requires 10.9 mL of 0.50 M NaOH to neutralize 15.0 mL ofan unknown H3PO4 solution. a. Balance the reaction equation. H3PO4+ NaOH Na3PO4 + H2O b. Calculate the...
- Q in a sodium carbonate/bicarbonate analysis, a 0.4057g samplerequired 15.65mL of 0.1690 MHCl solution to reach thephenolphtalein end point and a total of 40.30mL to achievve thebromocresol green endpoint. Determine wt...
- Q Write the complete molecular equation (CME), the complete ionicequation (CIE), and the net ionic equation(NIE) for a mixture of the following aqueous solutions. Usesolubility rules to determine what solid is...
- Q when we performed the TLC experiment, the class chose a mixturefor the mobile phase of 80 % ethyl acetate and 20 % hexanes. whywas this composition chosen
- Q give one advantage and one disadvantage of using 9.0 of aluminain your column instead of 4.5 g as you did during the columnchromatography experiment in lab.
- Q I was given this information and I need to draw a calibrationcurve of dissociation for carbon- Please help. I am having adifficult time getting started.Find pH of 1.) 0.300 M...
- Q A.) For which reaction will Kp = Kc?2 H2O(l) ↔ 2 H2(g) +O2(g)2 HgO(s) ↔ Hg(l) + O2(g)S(s) + O2(g) ↔ SO2(g)H2CO3(s) ↔ H2O(l) +CO2(g)CaCO3(s) ↔ CaO(s) + CO2(g)B.) How...
- Q What is the mode of synthesis of Ortho Tri-Cyclen (Norgestimateand Ethinyl Estradiol)?
- Q A.) The equilibrium constant for the reaction A(g) ⇌B(g) is 102 . A reaction mixture initiallycontains [A] = 18.6 M and [B] = 0.0 M. Which statement is true atequilibrium?The...
- Q If the nuclear binding energy of an atom of Be-9 is 9.6979 x10-12 J/atom, calculate the atomic mass of thenuclide.
- Q Sodium Borohydride Reduction of a Ketone1. How will the dibenzalacetone product be isolated from thereaction mixture and how will it then be further purified? How willthe product be characterized?2. What...
- Q 26.A solution of 0.075 M CoBr2 is saturated with H2S ( [H2S] = 0.10M). What is the minimum pH at which CoS ( Ksp = 5.9 x 10 -21) willprecipitate?Ka1...
- Q Use standard enthalpies of formation to calculateΔH∘rxn for the following reaction:C(s)+H2O(g)→CO(g)+H2(g)Express your answer using four significant figures.Use standard enthalpies of formation to calculateΔH∘rxn for the following reaction:N2O4(g)+4H2(g)→N2(g)+4H2O(g)Express your answer using...
- Q Explain the role of sodium acetate in the preparationof beta-D-glucopyranose pentaacetate. What does it do?
- Q The aluminum in a 1.258-g sample of impure ammonium aluminumsulfate was precipitated with aqueous ammonia as the hydrous Al2O3. XH2O The precipitate was filtered and ignited at 1000°C to giveanhydrous...
- Q Combustion analysis of a compound yielded 235.50 g CO2, 72.33 gH2O, 61.57 g NO2, and 85.72 g SO2. (a) What is the empiricalformula of the compound? (Assume it contains no...
- Q LP gas burns according to the exothermicreaction:C3H8(g) + 5 O2(g) right arrow 3 CO2(g) + 4 H2O(g)   ΔHrxn° = −2044 kJWhat mass of LP gas is necessary to heat 1.8 L...
- Q A gaseous fuel mixture stored at 744 mm Hg and 298 Kcontains only methane (CH4) and propane (C3H8). When 13.1 L of thisfuel mixture is burned, it produces 858 kJ...
- Q What detector(s) could be used to measure chloroacetaldehydeusing GC? How would the detector(s) measure the separatedanalyte?
- Q What types of compounds can be separated by HPLC but not GC?(Briefly describe properties.)short explaination please
- Q Hey there! My professor wrote this vague problem on the boardand I can't figure out how to solve it so --- I apologize inadvance for any lack of clarity.50.0 mL...
- Q Define what is Critical Micelle conentration and association ofsurfactant? Using your explanation explain how chemical structures,temperature and electrolyte affect for both ionic and non ionicCMC.Please explain as clearly as possible...
- Q Please answerIn the sediments, we can find concerning substances such as: (heavymetals) & (Polycyclic aromatic hydrocarbons)Tell how each gets into the runoff?what are the hazards and effects associated with each,...
- Q , Recording the time it takes (inseconds) for the temperature to drop in increments of2ºC:                             Temperature(°C)                Time(in second)                        2ºC                00:52.82                        2ºC                00:53.94                        2ºC:                00:64.48                      2ºC:                 00:67.44                        2ºC:                00:68.34                      2ºC                00:79.831, You will treat temperature as if it were a concentration (ofheat). In order to...
- Q Can anyone explain ligands, complex ion and amphotericsubstances that can act as an acid or base. (simply terms - highschool student) It is for a lab I did of separation...
- Q (THREE PARTS) Ethyl alcohol is formed by enzyme action on sugarsand starches during fermentation. The UNBALANCED equation is asfollows: C6H12O6 ----> CO2 + C2H6OA) Write the balanced chemical equation.B) If...
- Q Question 20: B) & C)(B) The purification protocol included application of 50mMNa,Na-buffer, pH 7.4 containing 10mM NaCl, 90mM KCL, 0.1% Tween-80,and 0.01% sodium azide. You have found following stock solutions...
- Q draw the lewis structure for CH3CHBrCHBrCH2CH3 and forCH3CHFCH2OH
- Q The equilibrium constant, K, for the following reaction is1.29×10-2 at 600 K. COCl2(g) CO(g) + Cl2(g)An equilibrium mixture of the three gases in a 1.00 L flask at600 K contains...
- Q The patient is a 24 year-old truck driver who recently droveacross the country, was admitted to the hospital because ofshortness of breath (dyspnea) and chest pain. Her dyspnea begansuddenly three...
- Q Suppose you need to prepare 1.0 L of Stock solution which musthave a concentration of 150 mg N/L. You start with solid PotassiumNitrate, KNO3 .A. How many moles of Nitrogen...
- Q In a stereospecific wittig reaction: Discuss the betaineintermediate of the Wittig reaction and why the stereochemistry ofthe intermediate determines the stereochemistry of the alkeneproduct.
- Q Q1: Write the balanced molecular reaction and the netionic reaction for the reaction between BaCl2 and Na3PO4 in aqueoussolution: Molecular reaction:____BaCl2(aq) + ____Na3PO4(aq) → ____ ___________ + ______________Net ionic reaction:Q2:...
- Q Circle the group in each pair below that has the highestpriority using the Cahn-Ingold-Prelog system-CH3 or -CBr3-CH2CBr3 or -CHBrCH3-CH=CH2 or -CH2CH3
- Q Using benzene or toluene as the only aromatic organic startingmaterial, devise a synthesis for each of the following:a. o-chlorotolueneb. 3-bromonitrobenzenec. p-toluenesulfonic acidd. 2-chloronitrobenzene
- Q Synthesis of banana oilthis is my discussion and below it is the professors comments.Can you correct it for me?Discussion:Â Â Â Â Â Â Â Â Â Â Â The purpose of the experiment performed was to synthesize isopentylacetate, or more...
- Q Balance the following redox reaction if it occurs inH2SO4. What are the coefficients in front ofH2O and Cr2(SO4)3 inthe balanced reaction?C3H8O2(aq) +K2Cr2O7(aq) →C3H4O4(aq) +Cr2(SO4)3(aq)Can someone please explain everything step by...
- Q In an acid base titration experiment, 50.0 ml of a 0.0500 msolution of acetic acid ( ka =7.5 x 10^-5) was titrated with a0.0500 M solution of NaOH at 25...
- Q A student aims to perform a titration to determine the exactconcentration of HNO3. The bottle was labeled with only anapproximation concentration of 0.5 M. In order to ensure accuracythe volume...
- Q A 10.00 mL solution of 0.0500 M AgNO3 was titrated with 0.0250 MNaBr in the cell: S.C.E.(saturated calomel electrode) titrationsolution Ag (s). (Ksp AgBr(s) = 5.0e-13)Find the cell voltage (v)...
- Q Determine the bond orders for the following species:S22-, S2-,S2, S2+,S22+.
- Q Consider the following reaction:A(g)?2B(g)Find the equilibrium partial pressures of A and B for each of thefollowing different values of Kp. Assume that the initialpartial pressure of B in each case...
- Q How much heat (in kJ) is given off when 41.0g of water at 50.0°Cis changed to 41.0g of ice at -5.00°C?The specific heat of water is 4.184 J/g·°CThe specific heat...
- Q 1) 20.00 mL of a 0.3000 M lactic acid solution is titrated with0.1500 M NaOH.a. What is the pH of the initial solution (before any base isadded)?b. What is the...
- Q Howdoes changing the solvent polarity affect reactant vs productstability? Can you justify these observations based on yourunderwear of organic chemistry and bonding behavior?
- Q In order to analyze for Mg and Ca, a 24-hour urine sample wasdiluted to 2.000 L. After the solution was buffered to pH 10, a10.00 mL aliquot was titrated with...
- Q what is partition coefficients and their application to medicineor the environment. please provide some background on thetopic.
- Q a) Predict in which direction the following reactions willproceed. Justify your answers briefly.I. HCl + NaF ---- HF + NaClII. AlBr3 + 3 NaF ---- AlF3 + 3 NaBrIII. Ti(OMe)4...
- Q what are the merits of normal absorbance to concentrationcalibration curve and log of absorbance versus log of concentrationcurve. Also state the comparison of the results obtained by thosemethods. which results...
- Q 6) If a mixture of compounds with a wide range of polarities hasto be separated, two different eluents have to be used to isolatethe chemicals. In this case, the eluent...
- Q Using some of the materials listed below, come up with areasonable synthesis for the preparation of Cp2TiMe2. TiCl4, Cp-H, KH, PhBr, Mg, dicyclopentadiene, Li, hexane, THF,MeI, table salt, urea, dihydrogen...
- Q A) Calculate the pH of a buffer that is 0.225MHC2H3O2 and 0.162MKC2H3O. The Ka forHC2H3O2 is 1.8x10-5B) A 1.00L buffer solution is 0.250M in HF and0.250M in NaF. Calculate the...
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