Chemistry question and answers for July 21, 2023
- Q Determine the molar solubility of AgI (Ksp = 8.50e-17) in 2.577M S2O32- if the complex ion [Ag(S2O3)2]3- forms with a Kf =2.90e13. Answers 0.09193/ 0.11637/ 0.04516/ or 0.14730
- Q A rough analysis of cell contents suggests their cytoplasmcontains 5% by weight of solutes: 1% is proteins of averagemolecular weight 45,000; 1% is soluble lipids of molecular weight400; 1% is...
- Q 1.Which C = O aliphatic group absorbs more to the right of theIR spectrum? Show an example and explain the reason.2. What functional groups show characteristic absorptions in theregion of...
- Q Thin Layer Chromatography1. After running the first plate, the spot was not observed.Provide two possible reasons (not including operator error) as towhy?2. What other technique could be used to determine...
- Q Develop a recipe for 1.00 L of pH 4.50 buffer using only 17.4 MHC2H3O2 and 3.00 M NaC2H3O2 (and deionized water). Be sure that itcanaccommodate additioin af at least 0.50...
- Q When doing the kinetic trials, Peyton mistakenly omitted thestarch solution from the kinetic trials. How will thisomission change the appearance of the resultant solution (fromthe mixing solutions A and B)...
- Q 1.A.write a chemical equation which goes with thestatement:i) Kb= 4.3 X 10-10 for aniline(C6H5NH2)ii)Kb = 2.1 X 10-4 for carbonate ionB. Kb =1.3 X 10-3 forC5H11N and kb= 6.3 x...
- Q To clean the impeller blades of a stainless steel tank, planttechnicians pour 210.0 L of a 240.0 g HNO3/L solution in a 820.0-Ltank to soak. When the tank needed to...
- Q Assuming that you start with 2.00 g of sodium benzoate and 5 mLof 3 M HCl, how many molar equivalents of HCl are you using? Usetwo decimal places.
- Q 1. The Ka of a monoprotic weak acid is 6.11 × 10-3. What is thepercent ionization of a 0.151 M solution of this acid? usequadratic equation to solve2. A certain...
- Q A furnace is burning natural gas (90% by mol methane and thebalance ethane) at 20 Celsius degree and 1 atm with 25% excess airat 150 Celsius degree and 1.1 atm....
- Q which of the following molecules exist in an ionized form at ph9? use ka/kb table. there are 2 answers.aniline, hypochlorus acid, phenol, ethylamine
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.100 M HClO(aq) with 0.100 M KOH(aq). Theionization constant for HClO can be found here.(a)...
- Q Although neither the american chemical society (ACS) nor theinternational union of pure and applied chemistry (IUPAC) haveofficial definitions of \"Soluble\",\"slightly soluble\".etc. The USpharmacopeia does, and these are given in the...
- Q 22) the diffusion coefficient of carbon FCC iron is lower thanBCC iron becausea) the temperature is higher for FCCb) FCC has a higher packing factorc) FCC is more cubicd) Carbon...
- Q Which of the following transitions in the Bohr hydrogen atomresults in the emission of the shortest wavelength photon.a. n = 2 → n = 5b. n = 5 → n...
- Q When you add 0.330 g of sodium metal to an excess ofhydrochloric acid, you find that 3430 J of heat are produced. Whatis the enthalpy of the reaction as written...
- Q I will rate, please answer.The density of an aqueous solution of C2H602(l) is 1.48 g/ml.The molarity of the solution is 2.84. Find the freezing point ofthe solution and the vapor...
- Q At a certain temperature, the equilibrium constant for thefollowing chemical equation is 2.50.SO2(g) + NO2(g)<---> SO3(g) + NO(g)At this temperature, calculate the number of moles of NO2(g)that must be added...
- Q titration of 25.00 ml of 0.100M CH3COOH with 0.100 M NaOH (weakacid, strong base)a) calculate the initial pH ( kb = 1.8 x10 ^-5)b) why is pH > 7 at...
- Q Gaseous ethane (CH3CH3) will react with gaseous oxygen (O2) toproduce gaseous carbon dioxide (CO2) and gaseous water (H2O).Suppose 26. g of ethane is mixed with 180. g of oxygen. Calculatethe...
- Q Pick the stronger base from each of the following pairs.Cl− or ClO−H2O or NO3−NO2− or CN−Find the percent ionization of a 0.250 M solution ofHC2H3O2
- Q A solution prepared by mixing 22.4 mL of 0.380 M NaCl and 22.4mL of 0.380 M KI was titrated with 0.190 M AgNO3 in a cellcontaining a silver indicator electrode...
- Q Indicate the force that is the predominant reason that onematerial in each pair in the question above has a higher boilingpoint than the other. (This would be the force that...
- Q Two 20.0-g ice cubes at –21.0 °C are placed into 225 g of waterat 25.0 °C. Assuming no energy is transferred to or from thesurroundings, calculate the final temperature of...
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