Chemistry question and answers for September 24, 2023
- Q Calculate the mass concentrations of the following gaseousmixtures enclosed in a room at 2 atmospheres and 50 oC:(a) Nitrogen (40% by mass), oxygen (40% by mass), and carbondioxide (20% by...
- Q Calculate the pH when 48.0 mL of 0.150 M KOH is mixed with 20.0mL of 0.300 M HBrO (Ka = 2.5 × 10^-9)
- Q What would happen to the moles of H2(g) you collect ifthe ZnO layer was present? How about the value of R that you wouldcalculate?From Gas Boyles Law and Experimental Determination...
- Q How many grams of solid sodiumnitrite should be added to 1.00 Lof a 0.226 M nitrous acidsolution to prepare a buffer with a pH of 4.305?grams sodium nitrite=Â Â g.
- Q Which of the following solutions would have the highest pOH?a.0.2 M KOHb.0.1 M NaOHc.0.2 M Ca(OH)2d.0.1 M NH3
- Q a). Calculate the molar mass ing/mol of the following compound (ammoniumdichromate):(NH4)2Cr2O7b). Calculate the mass, in g,of the following: 0.158 mol IF5 (iodinepentafluoride)c). Calculate the amount, inmoles, of the following: 25.4...
- Q A buffer solution contains 0.259 MNaHSO3 and0.459 MNa2SO3.If 0.0149 moles of hydrochloricacid are added to 125 mL of this buffer,what is the pH of the resulting solution ?(Assume that the...
- Q 1. What would be the result of failing to mark the solvent frontafter developing a TLC plate? Would this affect your ability tocalculate component Rf values? Why or why not?2....
- Q List 3 possible reasons why a person might not observe areaction even when the activity series indicates that it should.Please explain carefully. Thank you for your help.
- Q Calicene, like azulene (Problem 15-17), has an unusually largedipole moment for a hydrocarbon. Explain, using resonancestructures.
- Q How can one prevent oiling out?
- Q 3. You have been given the task of purifying a 60 mL sample oftoluene. In order to develop your plan of action, you ask about theimpurities likely to be present...
- Q A sample of O2 gas has a volume of 19.0 L at a pressure of 1.50atm and a temperature of 23 °C. What volume, in liters, will thegas occupy at...
- Q If bacteria are constantly evolving and developing resistance tothings like antibiotics, why don't they become resistant to soap,ethanol or bleach?
- Q I have finished a lab but in finding the percent deviation Ikeep coming up with different answers using the formula.Measured values for 4 unknown liquids are6.6c and 80.7c.-22.9c and 76.7c,-43.8c...
- Q 3.0ml of starch solution+ 3.0ml amylase added after 50minute, what color is it after iodine, what the amount of starch,what color is it after adding Benedict's test, what amount ofmaltose...
- Q find the pH in a mixture of:a) 50 ml 0,10 mol/L HCL and 10 mL 0,50 mol/L NaOHb) 50 mL 0,10 mol/L HCL and 20 ml 0,50 mol/L NaOHc) 100...
- Q Define the terms binding energy, stellar nuclesynthesis and massdefect. Why do lighter elements favor fusion reactions and heavierelements favor fission reactions?
- Q How is the shape of a monoprotic acid titration curve determinedby the pk of the acidic proton?
- Q Question 1.* What is the pH of 30 ml of a 0.35 M acetic acid solution?(pKa= 4.74)*What is the pH if you titrate the above 0.35 M acetic acidsolution with...
- Q For this assignment, write a paper about a baking soda ofinterest that is either manufactured or purified from naturalsources. In the body of the paper, address the followingquestions:Who discovered the...
- Q Which of the following statements is true concerning thedecomposition of liquid water to form hydrogen gas and oxygen gas?2H2O(l) → 2H2(g) + O2(g)a. ΔH is greater than ΔU because the...
- Q I am going to a lab next week on Acids, Bases,PH and Buffers, but i need some help, especially onBuffers.Q.5 Which solution(s) showed the greatest and which solutions(s)showed little or...
- Q Chromium is obtained by heating chromium(III) oxide with carbon.Calculate the mass percent of chromium in the oxide, and then usethis value to calculate the quantity of Cr2O3required to produce 620....
- Q You would like to make 100.00 mL of a 4.76 pH aceticacid/acetate buffer, in which the acid concentration is 0.070M.Write the reaction of the buffer with HCl solution. How many...
- Q Gas LawsUnits in Gas Law ProblemsOne problem associated with gas law problems is unit agreement.It is important that pressure, volume and temperature units matchor agree within a problem. Solve 1-4...
- Q Describe the nature of colloidal precipitate particles.(describe the electric double layer) ,Why do they tend to notsettle, and What factors control coagulation of a colloidalparticles?
- Q #16.110 A 130.0 −mL sample of a solution that is 2.9×10−3 M inAgNO3 is mixed with a 225.0 −mL sample of a solution that is 0.10 Min NaCN.After the solution...
- Q Predict the colors that the following aqueous solutions willproduce in a flame test:1. CaF2(aq)2. NaOH(aq)3. CuCO3(aq)An explanation for why each aqueous solution is their respectivecolor would aid me in understanding...
- Q 85. Antimony pentachloride decomposes according to thisequation:SbCl5(g) ⇌ SbCl3(g) + Cl2(g)An equilibrium mixture in a 5.00-L flask at 448 °C contains 3.85 gof SbCl5, 9.14 g of SbCl3, and 2.84...
- Q Describe the three sources of loss in the lab preparation ofmethyl benzoate from benzoic acid.One source is mechanical.
- Q A sample of cells with a total receptor concentration of 50 mMwas incubated with a ligand concentration of 100 mM. Following theincubation period, the concentration of unbound receptors wasdetermined to...
- Q 1.The concentration of the diluted solution determined in part band in part c must be equal. how do the values obtained compare?explainpart b: preparation of a dilution solutionstandard solution volume...
- Q 1.The Cu2+ ions in this experiment are produced by the reactionof 1.0g of copper turnings with excess nitric acid. How many molesof Cu2+ are produced?2. Why isn't hydrochloric acid used...
- Q If a single electron in an excited hydrogen atom isoccupying the 3rd energy level and then relaxes back tothe ground state, how much energy is released in the form ofelectromagnetic...
- Q describe how you would prepare 1.25L of a 0.025 M sucrosesolution from a stock solution with concentration of 5.00 M.
- Q define:CalorieSpecific heatEnthalphy change
- Q 1.Pyridine is a weak base that is used in the manufacture ofpesticides and plastic resins. It is also a component of cigarettesmoke. Pyridine ionizes in water as follows: C5H5N+H2O⇌C5H5NH++OH−C 5...
- Q TYPED ONLY: Choose an organic compound to describe in depth; donot choose a nonmetal already selected by another student. Includeinformation on whether it is found in nature, how it can...
- Q Is the reduction of benzoin to hydrobenzoin using NaBH4 and EtOHstereoselective: will only meso (cis) product be formed or amixture of meso/racemic products?
- Q Which reactions in the citric acid cycle are irreversible underphysiological conditions, and for each of these reactions, explainwhy the reaction is irreversible.
- Q There are several distinct differences between IR and UV-Visspectroscopy. Discuss the following as they relate to:(a)Â Â The types of interactions responsible for thesignals generated(b)Â Â Source of radiant energy(c)Â Â Signal detection(d)Â Â ...
- Q Synthesis of triphenylmethanol: 1. Start from bromobenzene toproduct, write chemical equations for this experiment stepwise andindicate which steps are water sensitive. 2. What is the majorfactor that increases by product...
- Q Which solids are used to make a solid oxide fuel cell?2. What is/are the fuels operating SOFCs?3. What do we know about the atomic structures, i.e. lattices andunit cells of...
- Q A40 ml sample of .50 M solution of HOCl is titrated with .20 M NaOHa) what is the initial pH of the acidic solution?b) what volume of base is necessary...
- Q using slater rules predict the effective nuclear charge of a4d electron in lead(ii) ion
- Q A beaker with 105 mL of an acetic acid buffer with a pH of 5.000is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer is...
- Q Describe how to separate a mixture containing phenol, aniline,benzoic acid, and toluene.
- Q 1.) A sample of nitrogen gas occupies a volume of 8.30 L at45.0°C and 0.740 atm.If it is desired to decrease the volume of the gas sample to7.22 L, while...
- Q 1. What is the pH at the equivalence point in the titration of a18.7 mL sample of a 0.381 Maqueous hydrocyanic acid solution with a0.496 M aqueous sodium hydroxidesolution?pH =2....
- Q 1) determine the heat of reaction from the bond enthalpies forthe reaction givenH2Â Â Â Â Â +Â Â Â Â Br2Â Â >>Â Â Â 2 HBr436.4Â Â Â Â Â Â Â Â Â 192.5Â Â Â Â Â Â Â Â Â Â Â 366.12) calculate the formal charges in the phosphate ion.3) what elements can have \"expanded...
- Q (1) Boric acid sample (H3BO3) contains boron (Na2B4O7.10H2O)as impurity. The quantity of this sample was dissolved in distilledwater to give 1 liter of A solution.(a) 25.00 cm3 of solution A...
- Q Imagine an alternate universe where the value of the Planckconstant is 6.62607·10^8 J·s.In that universe, which of the following objects would requirequantum mechanics to describe, that is, would show both...
- Q When Iodobenzene (b.p. 188.5 oC) codistills withwater at 760 torr, the boiling point of the mixture is 98.5oC. The vapor pressure of water at 98.5 oC is 714torr.What is the...
- Q What are the empirical formulas of substances with the followingmass percent compositions?(a) aspirin 4.48% H, 60.00% C, 35.52% O(b) ilmenite (a titanium-containing ore) 31.63% O, 31.56% Ti,36.81% Fe(c) sodium thiosulfate...
- Q Calculate the mass of methane that must be burned to provideenough heat to convert 347.0 g of water at 18.0°C into steam at110.0°C.(Assume that the H2O produced in the combustionreaction...
- Q Does the molecule of Succinic acid rotate around its central c-cbond?
- Q In the laboratory you dissolve 13.2 g ofiron(III) acetate in a volumetric flask and addwater to a total volume of 500 mL.What is the molarity of the solution?  M.What is the...
- Q I don't know to do ii) for letter a, as well as letterd, e and the EC . Can you help?The combustion of carbon monoxide is represented by the equationbelow:CO(g)...
- Q identify salts that will dissolve to give an acidicsolution:LiClC6H5NH3ClNaNo2CH3NH3BrCH3COONaKClO4Identify salts that will dissolve to give a nuetralsoultions:LiClC6H5NH3CNaNo2CH3NH3BrCH3COONaKClO4Identify salts that will dissolve to give a basic soultions:LiClC6H5NH3CNaNo2CH3NH3BrCH3COONaKClO4
- Q You are considering two different calcium supplements. Onecontains 1250 mg of Ca3(PO4)2 andthe other is 1500 mg of CaCO3. As a good chemist you areinterested in the percent mass of...
- Q Calculate the percent ionization of arsenous acid(H3AsO3) in solutions of each of thefollowing concentrations (Ka = 5.1e-10.)(a) 0.211 M%(b) 0.497 M%(c) 0.886 M%
- Q Calculate the pH during the titration of 25.00 mL of 0.1000 MHF(aq) with 0.1000 M RbOH(aq) after 15 mL of the base have beenadded. Ka of HF = 7.4 x...
- Q What is the pH of a solution made by mixing 0.514 moles of HBrand 0.299 moles of KOH, where the resulting volume of the solutionis 50.0 L?
- Q Consider an anaerobic process where glucose is fermented tosuccinic acid and ethanol as products (as well as CO2 and H2O),with biomass growth occurring through acetyl-CoA (assume K=5 molATP/C-mol biomass). Determine...
- Q 1) Given the two reactionsH2S(aq)⇌HS−(aq)+H+(aq),  H2S(aq)⇌HS−(aq)+H+(aq),   K1K1K_1= 9.53×10−8, andHS−(aq)⇌S2−(aq)+H+(aq),  HS−(aq)⇌S2−(aq)+H+(aq),   K2K2K_2= 1.13×10−19,what is the equilibrium constant Kfinal for thefollowing reaction?S2−(aq)+2H+(aq)⇌H2S(aq)2) Given the two reactionsPbCl2(aq)⇌Pb2+(aq)+2Cl−(aq),  PbCl2(aq)⇌Pb2+(aq)+2Cl−(aq),   K3K3K_3= 1.80×10−10, andAgCl(aq)⇌Ag+(aq)+Cl−(aq),  AgCl(aq)⇌Ag+(aq)+Cl−(aq),   K4K4K_4= 1.13×10−4,what is the equilibrium constant Kfinal for thefollowing...
- Q Which of the following species is attacked by benzene in theelectrophilic nitration reaction? (a)HNO3(b)NO2- (c)NO2+ (d)NO+Which of the following is the strongest activating group inelectrophilic aromatic substitution reactions? (a)CH2CH3 (b)...
- Q Question 1The lines observed in H-lamp are parts of Balmer Series. Allthese lines are due to a transition from various higher n value toa common n. What is this common...
- Q Predict and calculate the effect of concentration changes on anequilibrium system. Some SO2Cl2 is allowed to dissociate into SO2and Cl2 at 373 K. At equilibrium, [SO2Cl2] = 0.234 M, and...
- Q 1)How many grams of KH2PO4 are needed toprepare 100.0 mL of a 0.100 M buffer with a pH of 7.25 (assume apKa of 6.86)?2)How many grams of K2HPO4 are needed...
- Q Suppose a 480. mL flask is filled with 0.720 mol of N2 and 1.32mol of NO. This reaction becomes possible: N2 (g) + O2 (g) ⇌ 2NO(g)The equilibrium constant Kc...
- Q The fusion of deuterium and tritium produces 2.8×10−12J forevery atom of deuterium and atom of tritium. Part A How much energyis produced per mole of deuterium and mole of tritium....
- Q Determine the [OH−] , pH, and pOH of a solution with a [H+] of0.0018 M at 25 °C.[OH−]=pH=pOH=Determine the [H+] , pH, and pOH of a solution with an [OH−]...
- Q Consider the titration of a 23.0 −mL sample of 0.100 MHC2H3O2HC2H3O2 with 0.125 MMNaOH. Determine each of thefollowing.a.) the initial pHb.) the volume of added base required to reach the...
- Q 9a) A sample of an unknown gas is found to have a density of1.07 g/L at a pressure of 0.783atm and a temperature of 56 °C. Assume idealbehavior. The molar...
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