Chemistry question and answers for August 13, 2023
- Q A water is in equilibrium with CO2 in the atmosphere (partialpressure is 3.16 .10‾â´atm) and with CaCO3(s). The pH is 8.1.Ignoring Ca complexes, what is thesolubility (S) of Ca?
- Q For main-group elements, are outer electron configurationssimilar or different within a group? Within a period? Explain.
- Q In Part B of the experiment you uses a weak base, sodiumbicarbonate to completely convert a weak acid to a salt. Why wassodium bicarbonate able to completely convert the acid...
- Q Calculate the pH of a buffer solution that is obtained when1.727 mL of 3.0 M HCl are added to a 48.273 mL of aqueous solutionin which 0.727 g of Tris...
- Q Match the following aqueous solutions with the appropriateletter from the column on the right. 1. 0.14 m Al(NO3)3 A. Lowestfreezing point 2. 0.17 m Cr(CH3COO)2 B. Second lowest freezingpoint 3....
- Q 2. Balance the first redox reaction in acidic solution and thesecond redox reaction in basic solution.S + NO3- → SO2 + NOCr2O72- + Fe2+ -----> Cr3+ + Fe3+
- Q Determine the Vmax and the Km of the enzyme in the absence andpresence of each inhibitor. Calculate the KI for each inhibitor.Are the inhibitors all the same? Which is the...
- Q 1. draw a mechanism for the conversion of methoxybenzyl alcoholto methoxybenzaldehyde.2.The ethyl acetate layer was extracted with 0.2M NaOH to removetraces of methoxybenzoic acid that result from additional oxidationof the...
- Q The specific rotation, [α]D, for (-)-malicacidis -27. What is the observed rotation for a solutionof 0.75 g of (-)-malic acid in 10 mL of water in asample tube having a...
- Q Given the data:PbO(s), Df Hq = -217.3 kJmol–1, Sq = +68.7 J mol–1K–1PbO2(s), Df Hq = -277.0kJ mol–1, Sq = +68.6 Jmol–1 K–1O2(g), Df Hq= 0.00 kJmol–1, Sq = +205...
- Q Workers in underwater diving suits necessarily breathe air atgreater than normal pressure. If they are returned to the surfacetoo rapidly, N2, dissolved in their blood at the previously higherpressure, comes...
- Q Why is it not possible to assign R or S to a compound if it isdrawn such that the lowest-priority substituent is in the plane ofthe paper? What are some...
- Q   use the steady state approximation2N2O5 (g) → 4NO2 (g) + O2 (g)The mechanism is based on:  N2O5 → NO2 +NO3    ka  NO2 + NO3 →N2O5    k'a  NO2 + NO3 → NO2 +O2 +NO   kb  NO + N2O5 → NO2 + NO2 +NO2   kc
- Q A galvanic cell consists of a iron electrode in 1 M Fe(NO3)2 anda copper electrode in 1 M Cu(NO3)2. What is the equilibriumconstant for this reaction at 25oC? Enter you...
- Q A student reacts 58g of salicylic acid with 10 mL of aceticanhydride producing 3.3g of acetyl salicylic acid. What is thepercent yield of the reaction?
- Q Under what conditions does nickel hydroxide, Ni(OH)2, serve as a pseudocapacitive materials? Explainyour reason.
- Q Consider the reaction IO−4(aq)+2H2O(l)⇌H4IO−6(aq);Kc=3.5×10−2 Ifyou start with 25.0 mL of a 0.905 M solution of NaIO4, and thendilute it with water to 500.0 mL, what is the concentration ofH4IO−6 at...
- Q Acetic Acid Serial DilutionFor part of the experiment, you will need to prepare 100 mL of0.025 M CH3CO2H (acetic acid), starting from commercial “glacialâ€acetic acid, which has a concentration of...
- Q Match each subtype of lipid listed on the right to allstatements on the left that are appropriate to the lipidsubtype.Question 12 options:1234the bi-layer that makes up the plasma membrane around...
- Q The calcium carbonate in limestone reacts with HCl to produce acalcium chloride solution and carbon dioxide gas:CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g)EXPRESS YOUR ANSWER WITH THE APPROPRIATE UNITS.a) How many milliliters of 0.200 MHCl can...
- Q Part AIn the PhET simulation, select the solute in the dropdown menuunder the beaker. The ionic formula of the solute will display onthe beaker. You can click the box adjacent...
- Q Molecular weight: 93910.16 Theoretical pI: 6.03 1.1. Based on the pI of Taq, what pH buffer would you have to useto get Taq polymerase to stick to an anion exchanger?Briefly...
- Q If 42.8 mL of 0.200 M HCl solution is needed to neutralize asolution of Ca(OH)2, how many grams of Ca(OH)2 must be in thesolution?
- Q 1. In a lab, you will run 3 reactions, 2 of which will result inthe formation of the product listed below.Reaction 2: 10 mL of 0.1 M CuSO4 and 10...
- Q What are the major differences you would see in the infraredspectra of an alkane, alkene, and alkyne?
- Q Consider the reaction H2 (g) + F2 (g) <-- --> 2HF (g) .Ata certain temperature, 0.50 moles of hydrogen gas, 0.50 moles offluorine gas and .25 moles of hydrogen fluoride...
- Q Chemical kineticsFor the reaction 2A + B → C + D + 2E, data for a run with[A]0 = 800 mmol/L and [B]0 = 2.00 mmol/Laret/ks81420305090[B]/[B]00.836.745.680.582.452.318and data for a run...
- Q Two identical flasks of the same volume are labeled A and B.Flask A contains NH3(g) at  50ÂÂoC and flask B contains HCl(g) at 50oC. KE=1/2 mv2.a) Which molecule is moving the...
- Q A ground state hydrogen atom absorbs a photon of light having awavelength of 93.03 nm. It then gives off a photon having awavelength of 93 nm. What is the final...
- Q What are the net ionic equations for...- Magnesium and HCl- Iron and HCl- Copper and HCl- Zinc and HCl- Tin and HCl- Lead and HCl
- Q Write equations for the half-reactions that occur at the anodeand cathode for the electrolysis of each of the following aqueoussolutions. a) Ni(NO3)2 (aq) b)KCl (aq) c)CuBr2 (aq)Take into account the...
- Q A. The formation of organic compounds by the reaction (II)sulfide and carbonic acid is described by the following equaition:2 FeS + H_2CO_3 ---> 2 FeO + 1/m (CHOH)_n + 2...
- Q 3) For the case of 4% Al in Cu, why does the roomtemperature strength not decrease, while the hot aged samples showthe increase then decrease in strength with time. Be...
- Q Hello I'm stuck on my chemistry lab report.a. calculate the heat gained by the water in the calorimeter(qwater) after adding the aluminum.b. calculate the heat gained by the calorimeter (qcal)...
- Q Intermolecular forces, heating curves, phase diagrams,Clausius-Clapyron equation, and Unit cell calculations1.    If 42.0 kJ of heatis added to a 32.0 g sample of liquid methane under 1 atm ofpressure at...
- Q Predict whether or not extraction will work for the separationof the following using water and dichloromethane as the twoimmiscible solvents. Give a reason for your prediction.1. Paraffin wax from sodium...
- Q For the reaction3NO2(g)+H2O(l)→2HNO3(aq)+NO(g),What is the mass of HNO3 that is produced when 24.45 g of NO2 and24.45 g of H2O react
- Q When 10.0 mL of 1.00 M AgNO3 solution is added to 10.0 mL of1.00 M NaCl solution at 25.0 ° C in a calorimeter, a whiteprecipitate of AgCl forms and...
- Q Be sure to answer all parts find the value of S . Report thevalue with the appropriate sign.(a) 3 NO2( g ) + H2O( l ) 2 HNO3( l )...
- Q CALCULATE THE NUMBER OF FRENKEL DEFECTS PRESENT IN ACRYSTAL OF AgCl at 300 K, GIVEN THAT THE MATERIAL HAS A CUBE UNITCELL OF EDGE 0.555 nm THAT CONTAINS 4 A...
- Q 1. Write the overall balanced equation corresponding to thisabbreviated cell notation: Cr / Cr3+ // Pb4+ , Pb2+ / Pt (ExplainReasoning)2. Write the abbreviated cell notation for the reaction: 2Al(s)+...
- Q A buffer is prepared by adding 108 mL of 0.48 M NH3 to 143 mL of0.30 M NH4NO3. What is the pH of the final solution?
- Q Discuss the Michael and Aldol reactions mechanism by wordsfrom preparation of an alpha beta unsaturated ketone via Michaeland Aldol reactions
- Q A 3.10 g sample of methane, CH4, is combusted in a calorimeter.The calorimeter and water combined have a heat capacity of 42.30kJ/K. The observed temperature rise is 4.05 °C. Calculate...
- Q Shown below are the 4 reactions involved in the Cu cycle listedin random order.a.Cu(PO)(s) +6HCl(aq) → CuCl(aq) + 2HPO(aq) 
b.CuCl(aq) + Mg(s) →MgCl(aq) + Cu(s) 
c.Cu(s) + 4HNO(aq) →Cu(NO)(aq) +...
- Q 1.Why would it be important to place the same amount of asolution in the polarimeter tube when measuring optical rotation asthe amount of solvent when measuring theblank?a. Only a certain...
- Q A piece of titanium metal was anodized for 30.0 minutes,producing 10.0 g of TiO2. What current was used?
- Q Describe and explain the possible effect on your TLC results ofthe following experimental errors or variations:a) The analyte spots are too large(b) The analyte solution is too dilute.
- Q Look up the Osmotic Pressure in your blood and discuss why seawater will kill you if you drink it. (I know that it is more to dowith kidneys than blood…...
- Q What are the requirements for goodcrystalization/precipitation?
- Q A 20.8 mL sample of 0.304 M triethylamine, (C2H5)3N, is titratedwith 0.341 M hydroiodic acid.(1) Before the addition of any hydroiodic acid, the pH is (2)After adding 7.53 mL of...
- Q 1.how are water moeclues pulled into the sodium polyacrylatepolymer?2.What types of compounds might disrupt the water molecules fromthe sodium polyacrylate polymer? Why do you think this?
- Q Identify the atoms that correspond to each of the followingelectron configurations. Then, write the Lewis symbol for thecommon ion formed from each atom: (a) 1s22s22p5 (b) 1s22s22p63s2(c) 1s22s22p63s23p64s23d10 (d) 1s22s22p63s23p64s23d104p4...
- Q Why is Fourier transform an excellent method for datacollection in the IR range but not as useful for spectroscopy inthe UV range? b) What form does the raw data take...
- Q 2C2H4+O2 => 2C2H4OEthylene oxide is produced by the catalytic oxidation ofethylene. The feed into the reactor contains 1700 g/min ethyleneand 3700 moles/min aira. What is the limiting reactant?b. What is...
- Q There is a ton of good chemistry in Scotch whiskey production.Cooked grains are added to water resulting in a \"mash\". Yeast isadded to the mash and fermentation begins. Sugar in...
- Q Write the balance net ionic equation for:Reaction of V(OH)3 (s) with oxygen in basic solution to producethe final form listed above
- Q Explain the mass fragmentation pattern of (organicspectroscopy)1) Benzene2)Neopentane3)n-butyl alcohol4) Toluene5)1-Butanol6)Benzyl alcohol
- Q Suppose a 250.mL flask is filled with 2.0mol of O2 and 1.6mol ofNO . The following reaction becomes possible: N2g+O2g =2NOg Theequilibrium constant K for this reaction is 0.469 at...
- Q 1.How much water would be needed to completely dissolve 1.79 Lof the gas at a pressure of 720 torrand a temperature of 21 ∘C? Agas has a Henry's law constant...
- Q Propane is mixed with 20% excess air (propane air mixture isinitially at 25 °C and 2.0 atm) and combusted at atmosphericpressure. It is assumed that the heat transfer between the...
- Q Part A: A saturated solution of magnesium fluoride , MgF2 , wasprepared by dissolving solid MgF2 in water. The concentration ofMg2+ ion in the solution was found to be1.18×10−3M ....
- Q Calculate the change in entropy of 144 g ice at -5 oC as it isheated to 0 oC , melted, heated to 100 oC, and then vaporized atthat temperature. Suppose...
- Q What are “hallmarks†of chemical reactions, that is,how can youobserve that a chemical reaction has taken place?
- Q Wrapping double-helical DNA around histone octamers condensesthe DNA by a factor of 7. Higher order chromatin structurescondense this DNA even further. During metaphase, the DNA iscompacted by a factor of...
- Q The degree of unsaturation, or index ofhydrogen deficiency, is the number of pi bonds plus ringsin a molecule.Specify the degree of unsaturation (index of hydrogen deficiency)of the following formulas:(a) C25H28(b)...
- Q Mining companies use this reaction to obtain iron fromiron ore : Fe2O3(s) + 3CO(g) = 2Fe(s) + 3CO2(g). The reaction of167g Fe2O3 with 84.7g CO produces 76.5g Fe. Determine thetheoretical...
- Q Both cyclopentadiene and cyclopentadienyl nion have same valenceelectrons and same 5-membered Carbon ring structure. However,cyclopentadiene adopts \"envelope\" shape with C on right tilted outof the plane of 4 Carbon atoms....
- Q If the specific heat of a solution is 4.18 J/goC, andyou have 206 mL (1.03 g/mL) which increases in temperature by 2.6degrees, how many kilojoules did the solution absorb?
- Q An electrochemical cell is based on the following twohalf-reactions:Ox: Pb(s)→Pb2+(aq, 0.15 M )+2e−Red:MnO−4(aq, 1.70 M )+4H+(aq,1.5 M )+3e−→ MnO2(s)+2H2O(l)Compute the cell potential at 25 ∘C.
- Q Calculate the theoretical yield of acetaminophen:andPercent yieldp-aminophenol: 0.5 gacetic anhydride: .550mLProduct mass 1.297
- Q estimate on the basis of CTST, the pre-exponential factor at 300K for the following types of gas reactions: 1) a bimolecularreaction between an atom and a diatomic molecule with the...
- Q If 36.0 mL of H3PO4 react exactly with80.0 mL of 0.500 M NaOH, what is the concentration of thephosphoric acid?
- Q How can the carbon dioxide content of the atmosphere hundreds ofyears ago be determined today and what substances have been blamedfor the loss of ozone in the atmosphere?
- Q Outline IN DETAIL the procedure you would use to determine thegeometry of a molecule, if you start with just its chemicalformula.
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