Chemistry question and answers for August 15, 2023
- Q An HNO3(aq) solution has a pH of 1.61. What isthe molar concentration of the HNO3(aq)solution?
- Q What is the effect of the following changes in the O2 affinityof hemoglobin? (a) A drop in the pH of blood plasma from 7.4 to7.2. (b) A decrease in the...
- Q Sodium fluoride is added to many municipal water supplies toreduce tooth decay. Calculate the pH of a 0.00307 M solution ofNaF, given that the Ka of HF= 6.80 x 10-4...
- Q A 350.0 −mL buffer solution is 0.170 M in HFand 0.170 M inNaF.A) What mass of NaOH could this buffer neutralize before thepHrises above 4.00?B) If the same volume of...
- Q Be sure to answer all parts.The equilibrium constant Kc for the Reaction:H2(g) + CO2(g) <--> H2O(g) + CO(g) is 4.2 at 1650 C.Initially 0.87 mol H2 and 0.87 mol CO2...
- Q Does the spacing between the vibronic peaks in the fluorescenceemission spectra have to be the same as those in absorptionspectra? why?
- Q Are HCP metals typically more or less ductile than BCC metals?Why?
- Q Choose one of the transition or inner transition metals from theperiodic table. (I choose Titanium) Using Chapter 23 of Chemistry,The Molecular Nature of Matter and Change, and Internet resources,discuss why...
- Q Enter your answer in the provided box.Ethanol(C2H5OH)and gasoline (assumed to be all octane,C8H18) areboth used as automobile fuel. If gasoline is selling for $3.19/gal,what would the price of ethanol have...
- Q Howrapidly would the following particles be moving if they all had thesame wavelength as a photon of yellow light (lamda=575.0) answer inm/s-an electron of a mass 9.10939*10^-28g-a proton of a...
- Q How many grams of each of the following per kilogram of water inyour car radiator are needed to give equal protection againstfreezing down to -10.0 Degrees Celcius.A: Methy Alchohol (...
- Q When 0.653 L of Ar at 1.20 atm and 227°C is mixed with 0.278 Lof O2 at 501 torr and 127°C in a 400. mL flask at 27°C, what is...
- Q The B4O5(OH)4^2- ion, present in 5.0-Ml of a saturatedNa2B4O5(OH)4 solution at a measured temperature, is titrated to thebromocresol endpoint with 3.25 mL of 0.291 M HCl.a) How many moles of...
- Q a)Determine the limiting reagent in aspirin synthesis given 3gof salicylic acid. b)Based on your answer, calculate the maximumweight of aspirin that you could prepare. c)As is true for most\"organic\" reactions...
- Q You need to prepare an acetate buffer of pH 5.87 from a 0.841 Macetic acid solution and a 2.92 M KOH solution. If you have 975 mLof the acetic acid...
- Q Construct the titration curve, for the titration of 50.0 mL of0.125 M trimethylamine with 0.175 M HCL(aq). Please draw a graphand show all work.a) Calculate the initial pH of the...
- Q Procedure Reaction 1: Dissolving the Copper 1. Obtain a clean,dry, glass centrifuge tube. 2. Place a piece of copper wire in aweighing paper, determine the mass of the wire and...
- Q the standard free energy change for the decomposition of twomoles of hydrogen peroxide at 25​o​ C is -224 kJ.2H​2O​2(l) -> 2 H​2O(l) +O​2(g)          delta G​o = -224kJa.     Calculate the equilibriumconstant for...
- Q Pure copper may be produced by the reaction of copper(I) sulfidewith oxygen gas as follows:Cu2S(s) + O2(g) →2Cu(s) + SO2(g)If 0.490 kg of copper(I) sulfide reacts with excess oxygen, whatmass...
- Q Mothballs are composed primarily of the hydrocarbon naphthalene(C10H8). When 1.025 g of naphthalene is burned in a bombcalorimeter, the temperature rises from 24.25 ?C to 32.33 ?C.Find ?Erxn for the...
- Q In a waste-water treatment plant a 1.00x103 L tankwith 3.00x10-2 MNa2CO3(aq) is mixed with a2.00x103 L tank with of 6.00x10-3 MNa2CO3(aq). Assume sodium carbonatebehaves as a strong electrolyte.a) How many...
- Q A 5.65 −g sample of a weak acid with Ka=1.3×10−4 wascombined with 5.20 mLof 6.10 M NaOH and the resulting solution wasdiluted to 750 mL. The measured pH of thesolution...
- Q Predict under what temperatures (all temperatures, lowtemperatures, or high temperatures), if any, the reactions will bespontaneous or nonspontaneous.Part A) N2(g)+O2(g)→2NO(g)ΔH∘rxn=+182.6kJPart B) 2N2(g)+O2(g)→2N2O(g)ΔH∘rxn=+163.2kJPart C)4NH3(g)+5O2(g)→4NO(g)+6H2O(g)ΔH∘rxn=−906kJ
- Q Assume that all 4.0 mL of methyl salicylate was placed in thebeaker and reacted, that most of the NaOH solution is water, andthat the total water used is 56 mL....
- Q A 35.00-mL solution of 0.2500 M HF is titrated with astandardized 0.1120 M solution of NaOH at 25 C1) the pH at 0.50 mL before the equivalence point2) the pH...
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