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Chemistry question and answers for September 08, 2023

Q Part B How many grams of dry NH4Cl need to be added to 2.40 L ofa 0.800 M solution of ammonia, NH3, to prepare a buffer solutionthat has a pH...

Q For an element X, the following standard reduction potentialsexist at a temperature of our study:X^3+(aq) + 2 eâ€“ â†’ X^+(aq) Îµ1Â° = 1.192 VX^4+(aq) + 3 eâ€“ â†’ X^+(aq) Îµ2Â°...

Q i believe i understand sigma and pi for covalent bonds...however do not understand sigma and pi bonds for ionic bonds.soÂ Â what are properties of ionic sigma pi bonds...canyou/we sketch them....

Q Given the following reaction, which is the formation of an ironoxide mineral via hydrolysis:Fe3+ +3H2O = Fe(OH)3(s) + 3H+1) Identify the Lewis acids and bases in the above reaction.2) Define...

Q Explain the hydrogen bonding ?

Q Consider two compounds for which tm = 1 min,t1 = 14.3 min and t2 = 15.0 min. The peakwidths at half heights are 13.0 sec and 14.9 sec, respectively.What are...

Q given the reaction: Reaction of Dimedone andBenzaldehyde (2 Part)overview Part 1:Using a Pasteur pipet, add 0.2 g ofbenzaldehyde to 50 mL Erlenmeyer flask. 2. Add 8mL of 1:1 ethanol/water and...

Q - Neon Emission SpectrumA. Based on the emission spectrum for neon, what color would youpredict for the neon tube? ______________________________B. Search on Google for an image photo of a neon...

Q Hi, would appreciate some answers and explanations to the below.If you have any sources to back up any points would be amazing butnot necessary, Thanks!1) Why is dichloromethane used to...

Q Which of the following buffers would be the best choice for adesired pH of 3.0:Â Â Â Â Â Â Â Â Â Â Â a. Acetic acid (pKa=4.74)Â Â Â Â Â Â Â Â Â Â Â b. HF (pKa= 3.14)Â Â Â Â Â Â Â Â Â Â Â c. Carbonic acid (pKa=6.37)Â Â Â Â Â Â Â Â Â Â Â d. Propanoic acid (pKa=4.85)Â Â Â Â Â Â Â Â Â Â Â e. Not enough information...

Q Predict a likely mode of decay for each of the followingunstable nuclides. EXPLAIN why this might be so. a) Mo-109 b) Fr-202 c) Rn- 196 d) Sb - 132 e)...

Q Legal issues are important in the blood bank. Discuss hownegligence and malpractice are cause for concern with laboratory/phlebotomy professionals with both donor and patients.

Q Combustion analysis of a 13.42-g sample of the unknown organiccompound (which contains only carbon, hydrogen, and oxygen)produced 36.86g CO2 and 10.06g H2O. The molar mass of estriol is288.38g/mol .Find the...

Q Assuming that no equilibria other than dissolution are involved,calculate the concentrations of ions in a saturated solution ofeach of the following (see Appendix J for solubility products).(a) TlCl(b) BaF2(c) Ag2CrO4(d)...

Q Illustrate a short path distillation and a traditional distillationyou would use in lab

Q A gaseous mixture of propane, carbon dioxide and hydrogen with amixture total mass m = 188 g occupies a volume V = 33 L at t =88

Q What property enables you to classify an alcohol as primary,secondary, or tertiary?What do all compounds classified as aromatic compounds have incommon and why are they called aromatic?

Q The pKbpKb values for the dibasic base BB are pKb1=2.10 andpKb2=7.73.Calculate the pH at each of the points in the titration of 50.0mL of a 0.90 M B(aq) solution with...

Q 2-6.(i) Considering the effects of the ionic strength, useExcel to calculate the cell voltage of Zn |ZnSO4 (x M) || PbSO4(s) | Pb, wherex: 1Â´10-4, 5Â´10-4,1Â´10-3, 5Â´10-3, 0.01, and 0.05...

Q A student carried out reactions A through D as designed in Table1 in your electronic lab manual, plotted log(rate) vs. log(I-) inEXCEL, and the linear regression yielded the following equation:...

Q A solution contains 10.10 gg of unknown compound dissolved in50.0 mLmL of water. (Assume a density of 1.00 g/mLg/mL for water.)The freezing point of the solution is -6.05 âˆ˜Câˆ˜C. The...

Q Pick a number between 100 and 1000. For that energy in kJ/mol,what are the associated wavelength (nm), frequency (1/s = Hz) andwavenumber (cm-1)?

Q Question #2 (5 pts): Compare the G proteinsthat acts in transducing the signal from b-adrenergic receptors,and Ras. What properties do they share? How do they differ? What isthe functional difference...

Q Hydrogen gas is used as a fuel instead of fossil fuels. Storageof hydrogen is a challenge. One avenue of research involveschemical storage such as incorporating hydrogen as part of a...

Q Draw a detailed diagram of the TLC process

Q A solution of a specific vitamin has Î»max = 287 nm and aconcentration of 8.76 Ã— 10-7 M. The absorbance of the solution at287 nm is A = 0.190. What...

Q which of the following is a process with a negativeS?

Q The following reaction is first order in N2O5:N2O5(g)?NO3(g)+NO2(g)The rate constant for the reaction at a certain temperature is0.053/s.A)Calculate the rate of the reaction when [N2O5]= 5.4

Q Consider a buffer made by adding 132.8 g of NaCâ‚‡Hâ‚…Oâ‚‚ to 300.0 mLof 2.15 M HCâ‚‡Hâ‚…Oâ‚‚ (Ka = 6.3 x 10â»âµ) What is the pH of the bufferafter 0.750 mol...

Q 9) for the reaction[ 2Al + 3H2SO4 â†’ Al2(SO4)3 + 3 H2SO4] 6.0 g of Al (MW=26.98 g/mol)are added to 12.0 mL of 0.20 M of H2SO4A) what is the...

Q Write the balanced net ionic equation for the reaction thatoccurs in the following case: Cr2(SO4)3(aq)+(NH4)2CO3(aq)â†’ Part b.Identify the spectator ions in this reaction

Q Describe the characteristic chemical step that occurs duringcovalent catalysis. Which four different types of catalyticmechanisms did we discuss to hydrolyze peptide bonds inproteins?

Q pls answer 1-4 I would like to check with my answer1) Saponification of triglycerides gives glycerol and fatty acidsalts as shown in the equation below. The groups R1, R2 and...

Q Methanol is prepared industrially from synthesis gas (CO andH2). CO(g) + 2H2(g) â‡Œ CH3OH(g); Î”HÂ° = -21.7 kcal Would the fractionof methanol obtained at equilibrium be increased by raising thetemperature?...

Q 5a. When 4.355 grams of a hydrocarbon,CxHy, were burned in a combustion analysisapparatus, 14.72 grams of CO2 and3.014 grams of H2O were produced.In a separate experiment, the molar mass of...

Q Howdoes the watwr solubility of aminophenol change at different pHvalues?

Q Describe the principle of separation in a column used for size â€“exclusion chromatography. What is the separation range in term ofmolecular weight? Give the definition of â€œgel filtration: and â€œgelpermeationâ€.Â Â Â

Q 1. For the following reaction, 4.68 grams ofbutane (C4H10) are allowedto react with 20.3 grams of oxygengas .butane(C4H10)(g) +oxygen(g) ---> carbondioxide(g) +water(g)What is the maximum amount of carbon dioxide thatcan...

Q 1)How is the grams of Cl determined? If you do not dry theCopper, how will the Cl mass change?2)If the copper is turned into CuO, how are the moles of...

Q When ammonia is added to a solution that has Cu(OH)2(s)precipitate in it, the precipitate dissolves. Use Le ChÃ¢telierâ€™sprinciple to explain this.

Q How do you use the Rydberg equation to determine the color of aflame test for an element. For example how do we know thatpotassium gives off a violet color during...

Q What is the equilibrium concentration of Ni^2+ (aq) in thesolution. If one millimole of Ni(NO3)2 dissolves in 220.0 mL of asolution that is 0.300 M in ammonia?

Q Please explain the affects that concentration of monomer canhave on typical a radical polymerization

Q Calculate the molarity (M) of 150.6 g of H2SO4 in 1.290 L ofsolution.

Q What is the molarity of a solution containing 13.7 grams of NH3in 1.55 liters of solution?

Q mass of Na2S2O3 is 1.220gtitration of bleach with Na2S2O3 solution:trial 1: total volume used 66mLtrial 2: total volume used 73.8mLDensity of Bleach 1.074 kg/La) find the moles of Na2S2O3 used...

Q Explain why an internal standard is needed in quantitative NMR andindicate what information from the internal standard is requiredfor quantitative analysis

Q The vapor pressure of benzene is73.03 mm Hg at 25 Â°C. A nonvolatile,nonelectrolyte that dissolves in benzene ischolesterol.Â Â Calculate the vapor pressure of the solution at 25 Â°C when5.507 grams of...

Q Calculate the pH of a 0.100 M sodium benzoate, NaC6H5CO2,solution. The Ka of acetic acid is 6.3 x 10-5

Q 1.a) Calculate the solubility of Pb3(PO4)2 in water.b) Calculate the solubility of Hg2Br2 in water and in 0.300 MCaBr2. Explain why the solubilities are different in water and in0.300 M...

Q Remarkably, a catalytic system that uses light energy tohydrolyze water into hydrogen H2(g)and O(g) hasbeen devised (Science 334, 2011: 645-648) to capture andefficiently store solar energy. Hydrogen is \"clean burning\"...

Q If you have a 4.00 mg sample of a radionuclide known as Q-234,calculate the mass that will remain after 5.00 years given that thehalf life of Q-234 is 2.5 years.

Q 1.Phosphorus pentachloride is formed when phosphorustrichloride and chlorine react.PCl3(g) + Cl2(g) â‡Œ PCl5(g)The equilibrium constant for the reaction is KC =35.9 at 119 Â°C. If 0.489 mol of phosphorustrichloride is...

Q Fill out table and show all calculationsFinalÂ Â Â Â Â Â Â Â Â Â Â Â VolumeofÂ Â Â Â Â Â Â Â Â Â Â Â Â VolumeofÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Volume ofÂ Â Â Â Â Â Final volume (uL)[PNPP] mMÂ Â 0.5mM PNPP(ul)Â Â 0.2MTris-HCl(ul)Â Â enzyme (uL)0.01Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.02Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.04Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.06Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.08Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.1Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.2Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.3Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15000.4Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1500

Q An unknown compound contains only carbon, hydrogen, and oxygen.Combustion analysis of a 1.893 gram sample of the compound produced5.545 grams of carbon dioxide and 1.388 grams of water. The1.893-gram sample...

Q If 10 mL of 0.025 M benzoic acid (Ka = 6.5 *10-5) is titrated with 0.01 M NaOH, what is pH after 0ml, 20 ml, 50 ml, and 90 ml...

Q Trying this one again too... it's a completely differentquestion, I need to know how to make the (100 ml) solution.Glacial acetic acid is99.5% acetic acid (f.w. 60.052) by weight and...

Q Determine the pH during the titration of 73.5mL of 0.429 M acetic acid(Ka = 1.8Ã—10-5) by0.429 M KOH at the followingpoints. (Assume the titration is done at 25 Â°C.)(a) Before...

Q Determine the pH during the titration of 33.7mL of 0.345 M triethylamine((C2H5)3N,Kb = 5.2Ã—10-4) by0.345 M HI at the followingpoints. (Assume the titration is done at 25 Â°C.)Note that state...

Q Questions for Crystal Violet Lab.Give the derivation of a first order rate equation and show whythe plots of Ln ([dye]o/[dye]t) vs t shouldbe linear.What property other than [dye]t and[dye]o could...

Q QUESTION 1Which pair of compounds will form a buffer in aqueoussolution?a.HCN and NaCNb.NaCN and NaOHc.HCl and NaOHd.HCl and NaCle.HCN and HClf.NaCN and KCN10 points Â Â QUESTION 2A buffer solution is titrated...

Q Could I get an explanation of Henryâ€™s Law including definition,examples, and how it was derivied if possible. I don't want theWiki link, but I want to understand this law better.

Q Discuss the differences between the IR spectrum ofp-bromobenzoic acid and phenylboronic acid with the IR of 4-phenylbenzoic acid.

Q The excess Gibbs energy for liquid argon-methane mixtures havebeen measured at several temperatures. The results are gE/(RT) =xAr(1 ? xAr[A + B(1 ? 2xAr)]where numerical values for the parameters are...

Q Starting with acetylene develop a synthetic strategyto prepare 2,2,7,7-tetramethyloct-(4E)-ene.Â Your answershould include the following.Stereochemical/regiochemical justificationMechanistic justification (i.e. where possible showmechanism)Predict the 1H NMR signals for each step and provide adrawing...

Q 1a. If 20.0 grams of sucrose (C12H22O11) were diluted to 100.0mL with water, calculate:- Mass percent- Molarity1b. If 42.5 mL of isopropanol (C3H7OH) were added to 95.0 mL ofwater, calculate:-...

Q Which of these correctly is identified in terms of increasing1st ionization energy?A. C < N < OB. Ne < P < MgC. F < Cl < BrD. Cs < Na...

Q Part A: An acid (HA) dissociates as follows:HA â†’ H+ + A-The pH of the 0.25 M solution of HA is 4.64.What is [A-]?Express your answer as a decimal, not...

Q 1. A 1.189 g sample contains only vitamin C (C6H8O6) andsucralose (C12H19Cl3O8). When the sample is dissolved in water to atotal volume of 39.0 mL, the osmotic pressure of the...

Q Nature of Science and lab safety What makes one statement orclaim science? Along these lines, how do you distinguish ascientific claim from a non-scientific claim, or pseudoscience?

Q A buffer solution contains 0.444 M NH4Br and 0.365 M NH3(ammonia). Determine the pH change when 0.084 mol NaOH is added to1.00 L of the buffer. pH after addition âˆ’...

Q Part A: What mass of silver would plate onto the cathode if acurrent of 7.7 A flowed through the cell for 64 min ?t=___ s?Part B: How much time would...

Q Write the balanced NET IONIC equation for the reaction thatoccurs when nitrous acid and potassiumhydroxide are combined.The extent of this reaction is: .This reaction is classified as .A. Strong Acid...

Q A)arrange the following in order of increasing first ionizationenergy: Na, Cl, Al, S, and Cs.B) the first and second ionization energies of K are 419kJ/mol and 3052 kJ/mol, and those...

Q A 12.0M HCl solution has a density of 1.18g/ml. whatis the concentration of this solution in the following units?a) weight percentb) molalitythank you

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