Chemistry question and answers for August 23, 2023
- Q Consider 0.1 M aqueous solutions of NaCl(aq), CaCl2(aq),HCl(aq), HF(aq), NH3(aq), and table sugar(aq),a. Identify each of the above as strong, weak, or nonelectrolytes.b. Of the above solutions, which should conduct...
- Q Calculate analytical concentration for each of the followingsolutions:a) HCl solution, pH = 1.34b) Acetic acid solution, pH = 4.31c) Sulfuric acid solution, pH = 2.21d) Potassium hydroxide solution, pH =...
- Q When a cell reaction reaches equilibrium, E = 0. E = 0. both Eand E = 0. neither E nor E = 0.
- Q What is the pH of a solution that results when 0.012 mol HNO3 isadded to 610.0 mL of a solution that is 0.26 M in aqueous ammoniaand 0.46M in ammonium...
- Q Calculate [H3O+] and [OH−] for each of the follo...pH= 8.56pH= 11.20pH= 2.84
- Q Balance each of the following redox reactions occurring in basicsolution.Express your answer as a chemical equation. Identify allof the phases in your answer.H2O2(aq)+ClO2(aq)?ClO?2(aq)+O2(g)Al(s)+MnO?4(aq)?MnO2(s)+Al(OH)?4(aq)Cl2(g)?Cl?(aq)+ClO?(aq)
- Q Fresh orange juice containing 10 % solids and the balance wateris fed to an evaporator to produce final product of concentratedorange juice containing 40% solids. A fraction of the fresh...
- Q If the Ksp of PbI2 is 7.1 x10-9Â Â will precipitation occur when 10 mL of1.0 x 10-4 Pb(NO3)2 is mixed with10 mL of 1.0 x 10^-3 M KI? (Show calculation)
- Q Calculate the activity at 25 degrees Celsius of NACl(s) at 1,10, 100, and 1000 bar. The density of NaCl at 25 degrees Celsiusand 1 bar is 2.16 (g/cm3).
- Q 4. A puddle of coastal seawater, caught in a depression formedby some coastal rocks at high tide, begins to evaporate as the tidegoes out. If the volume of a puddle...
- Q A.Calculate [H3O+] in the following aqueous solution at 25 ?C:[OH?]= 1.6×10?9 M .Express your answer using two significant figures.B.Calculate [H3O+] in the following aqueous solution at 25 ?C:[OH?]= 3.0×10?2 M...
- Q SolutionAbsorbance[Fe(SCN)2+]eqB-10.0601.4*10-5B-20.1513.8*10-5B-30.3238.07*10-5B-40.3819.5*10-5B-50.4271.06*10-4SolutionVol of 0.002 M Fe3+Volume of 0.002 M SCN-Volume of H2OB-15.0 mL1.0 mL5.0 mLB-25.0 mL2.0 mL4.0 mLB-35.0 mL3.0 mL3.0 mLB-45.0 mL4.0 mL2.0 mLB-55.0 mL5.0 mL1.0 mL2. Determine the equilibium concentration...
- Q Explain why the mutation of Asp-52 to Asn-52 decreases enzymeactivity of lysozymes by 10,000 fold.
- Q Hey guys,So I am doing a presentation on the element Gold, Au. Now Icould go look up the information online but I am really running outof time here, could someone...
- Q In a reaction, aqueous NaOH is titrated against sulfuric acidsolution, H2SO4, according to the equation:2 NaOH (aq) + H2SO4 (aq) --> Na2SO4 (aq) + 2H2O (l)If 18.62 ml of sulfuric...
- Q combining selected ion monitoring (SIM) with isotope dilution inelectron ionization mass spectrometry allows:
- Q Use the following cell to answer the questions:Cr / Cr3+ (1.00 M) // Ni2+ (1.00 M) / Ni.a) How many milligrams of Ni would be plated on the cathode if...
- Q In an experiment similar to this one, the solubility ofpotassium hydrogen oxalate (KHC2O4, molar mass= 128.13 g mol) isdetermined. A 5.0 10^-2 M aqueous solution of KCI is saturated withpotassium...
- Q How many milliliters of 8.00 M KOH must be added to neutralizethe following solution? a mixture of 0.240 M LiOH (25.0 mL) and0.200 M HBr (75.0 mL)Write balanced net ionic...
- Q What is the advantage of using an internal standard in a gaschromatography experiment?
- Q What is the concentration of hydroxide ions after 50.0 mL of0.250 M NaOH is added to 120 mL of 0.200 M Na2SO4?What is the concentration of hydroxide ions after 50.0...
- Q Nuclear binding energyPart DCalculate the mass defect of the helium nucleus 52He. The massof neutral 52He is given by MHe=5.012225amu.Express your answer in atomic mass units to four significantfigures.  amu  SubmitHintsMyAnswersGive UpReviewPartPart...
- Q When methane (CH4) burns, it reacts with oxygen gas to producecarbon dioxide and water. The unbalanced equation for this reactionisCH4(g)+O2(g)→CO2(g)+H2O(g)This type of reaction is referred to as a completecombustion reaction.Part...
- Q Answer True or False for the following statement: a)In thefollowing chemical reaction, CaO is the reducing agent. 2Ca(s) + O2(g) → 2CaO (s) b)In the following chemical reaction, H2O is...
- Q Balance the following reaction in acidic conditions. If a 74.8mL sample of a solution of H2C2O4 (aq) requires 27.5 mL of a 0.037M KMnO4 solution for a complete reaction, what...
- Q what is the difference between K-factor andR-factor?
- Q Long and detailed theory behind HPLC. An introduction to HPLCand how the technique/instrument work and why one would want tomeasure the concentration of caffeine in a sample is essential.
- Q Determine the activation energy in kJ/mol for a first orderreaction if its specific rate constant 8.30e-05 s-1 at350.0 K and 3.25e+01 s-1 at 560.0 K.Ea = ______ kJ/mol
- Q What does R/S stereochemistry indicate?
- Q Explain and compare thin layer chromatography with columnchromatography (in-detailed answer)
- Q In a titration of a 100.0mL 1.00M NH3 solution with1.00M HCl, what is the pH of the solution after the addition of 127mL of HCl? Kb = 1.8 x 10-5...
- Q Most of our discussion of transition metals has focused aroundthem becoming positively charged ions. However, many of thetransition metals will also become negatively charged ions. Usingwhat you have learned from...
- Q Explain how the solid phase extraction catridges separates thecolorant (a potential interference) from the analytes.
- Q Consider the titration of a 26.0-mL sample of 0.180 M CH3NH2with 0.155 M HBr. (The value of Kb for CH3NH2 is4.4×10−4.)Determine the pH at 4.0 mL of added acidDetermine the...
- Q A 3.87 gram sample of ascorbic acid (Vitamin C) yield 5.80 gramsof CO2 and 1.58 grams of H2O on combustion.What is the empirical formula of this compound? (This compoundcontains only...
- Q The anthocyanin in hydrangeas can be isolated and used as anenvironmentally friendly pH indicator for titrations. At the end ofa titration reaction of a strong acid with a strong base,...
- Q Compare the advantages and limitations of column chromatographywith those of thin-layer and gas chromatography. Discuss all 3chromatography methods. When you would use them and in which caseis each useful and...
- Q Chlorophyll a and chlorophyll bare very closely related structures and you were not able toseparate them from each other in this lab by column chromatography.For each of the following variables...
- Q 19.36:Part ACa-40 (atomic mass = 39.96259 amu)Express your answer using five decimal places.Mass defect =  amu  SubmitMy AnswersGiveUpPart BExpress your answer using four significant figures.Binding energy per nucleon =MeV/nucleonSubmitMy AnswersGiveUpPart CV-51 (atomic...
- Q In an ideal solution of A and B, 2.75 mol are in the liquidphase and 4.255 mol are in the gaseous phase. The overallcomposition of the system is ZA =...
- Q What is the initial pH, at half way and after 12.5 mL ofNaOH 0.3235 M is used to titrate 65.00 mL of 0.1237 MHAc?   Ka=1.75 x 10-5
- Q 1)When one atom transfers one or more valence electrons toanother atom, a(n) ___ is formed.A.Covalent BondB.Ionic BondC.Metallic BondD.All of the above2)Typically, when two atoms form a chemical bond, the expectedresult...
- Q For calcite dissolution experiment, when you increase ionicstrength from 0 (infinite diluted) to 0.1 m, how much does thesolubility increase？
- Q Calculate the pH of 1.00 L of a solution that is 0.120M inHNO2 and 0.150M in NaNO2 before and after youadd 2.0mL of 15.0M HCL. [Ka(HNO2) = 4.0 x10-4]
- Q A titration is a procedure for determining theconcentration of a solution by allowing it to react with anothersolution of known concentration (called a standardsolution). Acid-base reactions and oxidation-reductionreactions are used...
- Q At 650 K, the reactionMgCO3(s)?MgO(s)+CO2(g) hasKp=0.026. A 12.5L container at 650 K has 1.0 g ofMgO(s) and CO2 at P = 0.0260 atm. The containeris then compressed to a volume...
- Q what volume of 0.305 M AgNO3 is required to reactexactly with 155.0 ml of 0.274 Monday Na2SO4 solution?
- Q a buffer solution is prepared by mixing 100cm3 aqueous NH3 0.1moldm-3 with 100cm3 NH4Cl mol dm-3 . Given that KB for NH3=1.74x10^-5...1) calculate pH of the buffer solution....2)calculate the solution...
- Q Prove that Inter energy is Independent of the path
- Q Draw the structure of a compound with the formula C9H20 that hastwo non-adjacent chirality centers, both S.
- Q After Carrying out the Aspirin synthesis experiment, Suggest anexperiment or technique based on what you have learned in the lastfew weeks to confirm the preparation of Aspirin. (Give fulldetails) Hint:...
- Q a 0.1965g sample containing copper is analysediodometrically. copper(ii) is reduced to copper(i) by iodide:2Cu2+ + 4I- --> 2Cul + I2calculate the percentage of copper in the sample if25.0mL of 0.1005M...
- Q Most of our discussion of transition metals has focused around thembecoming positively charged ions. However, many of the transitionmetals will also become negatively charged ions. Using what youhave learned from...
- Q Will a precipitate form if 100.0 mL of 2.5 × 10−3M Cd(NO3)2 and75.0 mL of 0.0500 M NaOH are mixed at 25°C? Calculate theconcentration of cadmium ion in solution at...
- Q As a food chemist for a major potato chip company, you areresponsible for determining the salt content of new potato chipproducts for the packaging label. The potato chips are seasonedwith...
- Q Calculate the solubility (a) in mol/L and (b) in g/L of AgCl in2.0 M NH3(aq). What is the concentration of Ag+ in this solution?(Ksp = 1.6 x 10-10; Kf =...
- Q 5) The following example illustrates an ammonia synthesisprocess in which an inert gas (I) is present, necessitating a purgestream. The fresh feed to the process contains nitrogen andhydrogen, as well...
- Q About Osmosis:Potato section A: the mass before soaking in distilled waterwas 3.12g and after soaking 3.21g.Potato section B: The mass begore siaking in 10% NaCl.Explain, write and answer separately question...
- Q A solution that may contain Cu2+, Bi3+,Sn4+, or Sb3+ ions is treated withthioacetamide in an acid medium. The black precipitate that formsis partly soluble in strongly alkaline solution. The precipitatethat...
- Q Calculate the pH at the equivalence point in titrating 0.011 Msolutions of each of the following with 0.054 M NaOH.(a) hydrobromic acid (HBr)(b) phenol (HC6H5O), Ka = 1.3e-10(c) hypoiodous acid...
- Q 19. Why are receptors and substrates sometimes explained interms of locks and keys?26. Why is a drug
- Q Estimate the heat of vaporization of diethyl ether at its normalboiling point using Trouton’s rule and Chen’s rule and compare theresults with a tabulated value of this quantity. Calculate thepercentage...
- Q In the reaction shown below, what species is oxidized? 2NaI +Br2 → 2NaBr + I2A) I–B) I2C) Br2D) Na+E) Br–
- Q 1.     Describe an ELISA procedurethat you would use to determine if a person was infected with thehuman immunodeficiency virus, the causative factor of AIDS.
- Q how would the polarizability change in magnitude if we raise thetemperature of xenon to above its boiling point? why?
- Q 14. From the half-reactions below, calculate the solubilityproduct of Mg(OH)2.         Mg2+ + 2e º Mg(s)                      E° = -2.360 V         Mg(OH)2(s) + 2e º Mg(s) + 2OH- E° = -2.690V
- Q balance the redox reactionNO2- + MnO4- +H+ -------> NO3- +Mn2+ + H2Oshow work please
- Q 10. A mixture of 0.08729 mol of H2O, 0.1041 mol ofCH4, 0.08069 mol of CO, and 0.1098 mol of H2is placed in a 1.0-L steel pressure vessel at 1034 K....
- Q Can anyone explain the complete mechanism for preparation ofamines via gabriel synthesis starting with phthalimide?
- Q An unknown compound has a molecular mass of 180.15g/mole and an elemental analysis showing that it is 60.00% C and4.48% H. Determine the molecular formula.
- Q Secondary prevention of type II diabetes includes monitoring ofyour patient glucose control. Your patient comes in confused abouttheir blood tests results. Although he understands his fastingplasma glucose result, he does...
- Q Why should we boil water and shake the solution in thevolumetric determination of alkalinity of soda ash?
- Q what is the percentage of the R enantiomer in a sample ofCarvone that has a specific rotation of 30, given that the specificrotation of (R)- CARVONE IS -61
- Q The triprotic acid H3A has ionization constants of Ka1 = 6.2×10–3, Ka2 = 9.6× 10–9, and Ka3 = 6.3× 10–12. Calculate thefollowing values for a 0.0790 M solution of NaH2AA)Calculate...
- Q Consider the complextrans-Mn(NH3)4(CN)2. What pointgroup is this complex?What is the symmetry for each of the d orbitals?Draw the expected d orbital splitting, and fill withelectrons.In units of Bohr magnetons, what...
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