Chemistry question and answers for August 15, 2023
- Q Hello, this is for my analytical chemistry class. How do yousolve the following question: Calculate the solubility ofPb(IO3)2 in a solution of 0.020MMg(NO3)2 using activities. Assume that sincePb(IO3)2 is only...
- Q A 1L buffer solution is 0.150M in HC7H5O2 and 0.250M inLiC7H5O2. Calculate the pH of the soln after the additon of 100mLof 1.00M HCl. The Ka HC7H5O2 = 6.5x10^-5
- Q 1. Briefly describe how a drying agent works. List the names andchemical formulas for five typical drying agents.2. Elemental bromine (Br2)reacts with 3-hexene to form3,4-dibromohexane.a. Write out the balanced equation...
- Q 1) Carbon dioxide and water combined typically make up 1-3% ofour atmosphere, and yet, we are constantly monitoring theatmospheric content of CO2 and H2O. Why? Explain why they vary fromhour...
- Q Oxalic acid dihydrate is a solid, diprotic acidthat can be used in the laboratory as a primarystandard. Its formula isH2C2O4
- Q A 17.5 g sample of a candy bar is burned in a bomb calorimeter,which has a heat capacity of 9.25 kJ/°C. The temperature increasesfrom 19.7°C to 57.3°C.What is the fuel...
- Q Consider the following gas-phase reaction:C2H2(g) + 4 Cl2(g) 2CCl4(g) + H2(g)Using data from Appendix C of your textbook calculate thetemperature, To, at which this reaction will be atequilibrium under standard...
- Q Find accepted values for the density, molar mass, and molarvolume (you may need to calculate this from other literature oraccepted values) of oleic acid and Avogadro’s number. Then, Write aformula...
- Q The first theories to explain the similarities between bacteriaand mitochondria or chloroplasts suggested that an early eukaryoticcell actually engulfed but failed to fully digest a free-livingprokaryotic cell. Why is such...
- Q What are the concentrations of H3O+ and OH- in each of thefollowing?a. 1.55 M NaOHb. 0.15 M Sr(OH)2c. 0.056 M HClO4d. 0.47 M HCl
- Q Complete and balance the precipitation reactions. Includephysical states in your equations.AgNO3(aq)+NaCl(aq)----->K3PO4(aq)+MgCl2(aq)------->
- Q Alkene metathesis or olefin metathesis includes two alkeneswhere the double bonds of the alkenes break and the fragments arereformed, however if the alkenes are asymmetrical there is amixture of products,...
- Q Rate as a Function of Temperature: The 2 Point ArrheniusEquation1. When the temperature is changed from 25°C to 46.3°C, thereaction rate doubles. What is the Activation Energy (Ea) in kJ/molfor...
- Q One scale for electronegativity is based on the concept that theelectronegativity of any atom is proportional to the ionizationenergy of the atom minus its electron affinity: electronegativity =k(IE - EA),...
- Q E. Identification of UnknownFrom your test results, identify your unknown as asaturated (alkane) or unsaturated (alkene)hydrocarbon. Give your reasoning. If the names of thepossible compounds are known, writetheir names and...
- Q what is the handbook value of the concentration of calciumcarbonate in hot water?
- Q Discussion about: Chemistry and HealthSmog is the pollution of the atmosphere over large cities with amixture of nitrogen Oxide (NO, NO2) gases and Ozone (O3) gas. Thesegases are produced by...
- Q Find the second virial coefficient for the Dieterici equation ofstatep = (RT/V-b) exp (-a/RTV)
- Q Biochem Lab: Explain the basis for the stacking gel portion of apolyacrylamide gel. Describe how it works with respect to theloaded protein samples as well as the running buffercomponents.
- Q what is the molarity concentration of lead cation in a saturatedsolution of lead sulfate? Ksp(PbSO4)= 6.3x10^-7 and what is thesolubility of PbSO4 in g/ml?show clear equations and answers
- Q Sally chemist is attempting to determine the mass % of aceticacid in vinegar. Below is an excerpt from her lab book:A. Prepared vinegar analyte25.0 mL vinegarmass of vinegar 25.20 gramsadded...
- Q Use critical temperature and pressure for oxygen gas todetermine critical molar volume assuminga) ideal gas  L/moleb) van der Waals gas  L/molec) Redlich-Kwong gas  L/mole
- Q What is the metabolic function of these vitamins a, b12, c,d3, ande?
- Q A 2.892 gram sample containing an unknown amount of arsenictrichloride and the rest inerts was dissolved into a NaHCO3 and HClaqueous solution. To this solution was added 1.850 grams of...
- Q Calculate the adiabatic flame temperature for the followingmixtures initially at 298 K: stoichiometric butane-air mixture,stoichiometric butane-oxygen mixture, 2.0% (by volume) of butane inair. Calculate without therestriction on the possible products...
- Q What is the Ksp in terms of the molar solubility sfor the substance Fe (OH)3?A.sB.s2C.2s3D. 4s3
- Q A molecule has an ionizable group with a pKavalue of 8. At pH equal to 7.0, estimate roughly how much of thegroup is deprotonated (expressed as %)? Use 2 decimal...
- Q Howdo KCN and HCldiffer in bonding?Compare and contrast colorimetry and spectophotometry . Howwould spectorphotometry be used to detect the cyanide ion? Pleasegive me a full and complete answer. Thanks
- Q What is the molarity of 109mL of a 17.2% NaCl solution?
- Q Dr. Dahm is trying to generate CO2(g) by reacting anacid with calcium carbonate. If he pours 389 mL of a 1.6 M solutionof H2SO4 into a flask that contains 69.5...
- Q calculate the % difference of the 0.5133g and 0.5275 g ofstruvite from the two water samples in question a. ----> two10.0 Ml water samples were taking The procedure in this...
- Q In a procedure developed to determine the percent zinc in post1982 pennies, 50 mL of an HCl solution was used to react (dissolve)all of the zinc in the penny. To...
- Q Calculate the pH of a 0.89 M methylamine solution.
- Q What is the precentage by mass of oxygen in CaCO3?
- Q For the reaction shown, compute the theoretical yield of product(in grams) for each of the following initial amounts ofreactants.2Al(s)+3Cl2(g)→2AlCl3(s)Part B7.8 g Al, 25.2 g Cl2Express your answer using three significant...
- Q 1. The Kaof iodic acid(HIO3) at 25 °C is1.6*10-1. What is theKb of iodate(IO3-) at thistemperature?b. Use the information in the first question to calculate the pHof a 0.10 M...
- Q Calculate the energy difference for a transition in the Paschenseries for a transition from the higher energy shell n=6. Expressyour answer to four significant figures and include the appropriateunits
- Q 1) You are given an unknown containingKClO3.Following the procedure in your manual, you obtain the followingfictional dataNote! Mass of empty testtube54.5679 gMass of test tube +unknown54.8523 gMass of test tube...
- Q Compare the standard molar entropy for three common forms ofiodine in different states ofmatter. Explain the trend in thevalues; why are they different?S
- Q Compare the Peng-Robinson vapor pressures to the experimentalvapor pressures (respresented by Antoines constants) forn-Hexane
- Q A sample solution of [(+/-)-Co(en)3]I3(with no impurities) is found to have [α]D =+77o, whereas a pure enantiomer would give a value of[α]D = +89o. Calculate the exact percentageof (+) and...
- Q Are green potatoes poisonous or is this a myth?
- Q Provide a detailed description of the theory of Ramanspectroscopy and explain (in general terms) how it is used in thefield of physical chemistry.
- Q compare column, thin-layer, and gas chromatography in terms ofmobile phase and stationary phase
- Q Two chemicals are present in the same sample, where compound Ais the analyte of interest and B is a possible interfering agent.It is known that A has a distribution ratio...
- Q in GC calibration curve, which concentration remains constantand which one changes? (analyte vs internal standard)
- Q A 280.0 mL buffer solution is 0.260 M in acetic acidand 0.260 M in sodium acetate.Part AWhat is the initial pH of this solution?Part BWhat is the pH after addition...
- Q Describe how the solvents worked as the mobile phase of theliquid chromatography experiment. Why was it necessary to usedifferent concentrations of aqueous isopropanol in thestep-gradient separation?
- Q Consider the titration of a 23.4 −mL sample of 0.125 MRbOH with0.110 M HCl. Determine each of the following.Part A) the initial pHPart B) the volume of added acid required...
- Q A solution containing 3.48 mM X (analyte) and 1.67 mM S(internal standard) gave peak areas of 3483 and 10069,respectively, in a chromatographic analysis. Then 1.00 ml of 8.47mM S was...
- Q A solution prepared by mixing 60.0 mL of 0.220 M AgNO3 and 60.0mL of 0.220 M TlNO3 was titrated with 0.440 M NaBr in a cellcontaining a silver indicator electrode...
- Q prepartion of biodiesel labDescribe the role of potassium hydroxide in this reaction?
- Q What is the pH of a saturated solution of aluminum hydroxide? Al(OH)3 Ksp is 1.8X10^-33
- Q You have been asked to experimentally determine the Calorie (1Calorie = 1000 calories) values of various desserts. You realizethat a combustion reaction is analogous to the digestive reactionoccurring during metabolism...
- Q Nitrous oxide (N2O) is also known as “laughing gasâ€. Write allof the resonance structures for N2O (one of the N atoms is thecentral atom). Then,~ calculate the formal charges on...
- Q Calculate the mass of glucose metabolized by a 53.6 kg person inclimbing a mountain with an elevation gain of 1610 m . Assume thatthe work performed in the climb is...
- Q When you dissolve an eggshell, you might not react it completely.Will the amount of the base used in the titration be higher, lower,or the same as if the reaction went...
- Q You are given 2.00 g of a mixture of phenol, aniline, phthalicacid and methyl benzoate. Describe, how you would use an acid-baseextraction technique to separate all three compounds by drawing...
- Q Why is it better to use a rotovap instead of a hot plate toevaporate ether?
- Q Using values from Appendix C of your textbook, calculate thevalue of Ho, So, and Go for each of the following reactions atstandard temperature (298 K). Next calculate G if ALL...
- Q Please show how to do each stepLAB: MassPercent1-Weigh approximately 5 g NaCl on weigh paper and add to a 250ml Erlenmeyer flask. Record the exact mass here (The mass is...
- Q Assume you dissolve 0.235 g of the weak acid benzoic acid,C6H5CO2H, in enough water to make9.00 ✕ 102 mL of solution and thentitrate the solution with 0.153 M NaOH.C6H5CO2H(aq) +OH-(aq)C6H5CO2-(aq)...
- Q The laboratory reports that the concentration of ammonia asnitrogen in a sample is 3.4 mg/l. The pH value of the sample is 5.5units. In what form is almost all of...
- Q Consider the following data on some weak acids and weakbases:acidKanameformulaacetic acidHCH3CO2×1.810?5hydrocyanic acidHCN×4.910?10baseKbnameformulapyridineC5H5N×1.710?9anilineC6H5NH2×4.310?10Use this data to rank the following solutions in order ofincreasing pH. In other words, select a '1'next to...
- Q Suppose we have a solution of lead nitrate, Pb(NO3)2(aq). Asolution of NaCl(aq) is added slowly until no further precipitationoccurs. The precipitate is collected by filtration, dried, andweighed. A total of...
- Q Select the reactions for which we should expect a delta S(entropy) to be >0. Can select more than one.CO2 (g) + 2H2 (g)-->CH3OH (l)2SO2 (g) + O2 (g)--> 2SO3 (g)Ba(OH)2...
- Q Order: Vancomycin 12 mg/kg IV every 8 hours for an 11 year oldchild with a staph infection.Supply: Vancomycin 500 mg vial to bereconstituted with 10 mL of sterile water. The...
- Q 25.0 g of water cooled 10 C to -20 C. Calculate the total Energychange.With these useful numbers: ΔH fus = 334 J/g Δvap = 2260 J/gCp for ice = 2.08...
- Q A solution is made by dissolving 40.0 g of KOH in 100 mL ofwater (density 0.995 g/mL) to form a solution. What is the masspercent solute in the solution?1. 40.2%2....
- Q You have a one liter solution of kerosene containing 25 wt%propionic acid, add one liter of water, mix thoroughly and allowthe two phases to settle. At this temperature, the distributioncoefficient...
- Q Trypsin and chymotrypsin are members of the family of serineproteases. They cleave peptide bonds at the C-terminal end ofspecific residues. Chymotrypsin recognizes aromatic residues, whiletrypsin recognizes lysine and arginine. The...
- Q Given the following equation: if 25.4g of Al2O3 is reacted with10.2g of Fe, determine the limiting reagent.
- Q 2. Write the balanced chemical equation including states ofmatter, complete ionic reaction and net ionic reaction for thereaction between barium nitrate, Ba(NO3)2, and sodium chromate,Na2CrO4.a. Balanced Chemical Equationb. Complete Ionic...
- Q Write the complete electron configurations Cobal(Co) atom forits:       1-its ground state        2- anexcitedstate       2- Draw the orbital diagram for the complete electron configurationof Sulfur atom3-Briefly explain how the followingconcepts are used...
- Q At 55.0 ?C, what is the vapor pressure of a solution prepared bydissolving 70.6g of LiF in 265g of water? The vapor pressure ofwater at 55.0 ?C is 118 mmHg....
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