Chemistry question and answers for August 19, 2023
- Q If water is pure enough and in a sufficiently smooth container,it can sometimes be “supercooled†so that it remains liquid for atime even when its temperature is lowered below its...
- Q Calculate the pH at the equivalence point for the titration of1.328 M HA (a weak acid with pKa = 6.95) with 1.328 M NaOH.
- Q Calculate the pH at the equivalence point for the titration of0.614 M B: (a weak base with pKb = 4.13) with 0.614 M HCl.
- Q 1) A) A samole of flourine gas is in a 12.56 L cylinder at 41.35degree celsius and 700 torres. What is the kinetic energy and theroot mean square velocity of...
- Q 2A. The label on a 1.00-L bottle of wine states that the alcoholcontent is 12.5% (v/v). How much alcohol is present in thebottle?2B. How do you make 2.50 L of...
- Q Consider the reaction of NH3 with water:NH3 + H2O ↔NH4++ OH-(Kb=Kw/Ka)and alsoNH4+ H2O ↔NH3 + H3O+ (Ka = 5.70×10-10)Including the ICE Tables:a) Find the pH of 50.00 mL of 0.200M...
- Q What is the pH of a 0.445 M ammonia solution? Express youranswer numerically to two decimal places.
- Q One of the substances (ethylene glycol) appeared to increase intemperature as it evaporated (Change in temperature uponcomplete evaporation: +1.4). How can this be the case?What alteration to the experiment could...
- Q 1. What is a peptide bond? 2. How does the primary structure ofproteins differ from the secondary structure? A. Peptide Bonds A.1Structure of glycylserine Structure of serylglycine A.2 Hydrolysisof serylglycineQ.1...
- Q 25.0 mL of a 0.0450 M butylamine solution is extracted with 105mL of solvent. The partition coefficient for the reaction is 2.00and the pKa of the protonated form of butylamine...
- Q Benzoic acid is a weak acid that has antimicrobial properties.Its sodium salt, sodium benzoate, is a preservative found in foods,medications, and personal hygiene products. Benzoic acid ionizes inwater:C6H5COOH⇌C6H5COO−+H+The pKa of...
- Q Whyis it important to compare the solvent height in the developingchamber with the location on the TLC plate where the spots areplaced?
- Q Isolation and characterization of the enzyme alkaline phosphatefrom escherichia coli: protein purification.2) why is it necessary to dialyze the enzyme after ammoniumsulfate precipitation?
- Q Why are aryl and vinyl beta eliminations rare.
- Q Explain what characteristics of functional groups make anorganic compound lipophilic and what ones make a compoundhydrophilic. Explain why these characteristics are lipophilic orhydrophilic.
- Q find the radius of each stable isotopelead- 204lead-206lead-207lead-208using the nuclear theory the average radius of a nucleus isgiven byR=1.2x10^-13 A^1/3 cmB) what is the natural % abundance for each isotope...
- Q In HNMR,- What are non-equivalent hydrogens- What are the \"# of Hydrogens per Peak\"- What is coupling and chemical shifts?
- Q What spin functions are allowed for the inner pair of electrons(1s2) in the 1s22s configuration ofLi? What spin functions are allowed for the outerelectron (2s) in the same configuration?
- Q A 14.585 g sample of CaCl2 was added to 12.283 g of K2CO3 andmixed in water. A 3.573 g yield of CaCO3 was obtained.(1) What is the limiting reagent?(2) Calculate...
- Q What is a lachrymator?What are appropriate precautions and safety equipment touse when working with lachrymators?
- Q Suppose 5.25 mol of each reactant are used for the followingchemical reactions, identify the limiting reactant. Explain.____ C6H6 (l) + ____ O2 (s) → _____CO2 (g) + _____ H2O (g)_____...
- Q Aqueous sulfuric acid (H2SO4) reacts with solid sodium hydroxide(NaOH) to produce aqueous sodium sulfate (Na2SO4) and liquid water(H2O). If 3.37 g of water is produced from the reaction of 13.7...
- Q Explain motions in catalysis
- Q A sample of rainwater is observed to have a pH of 7.4. If onlyatmospheric CO2 at 390 ppm and limestone dust are present in theatmosphere to alter the pH from...
- Q Organic Chemistry : HNMR QUESTIONSWhat is the relationship between the # of scans and the # ofsignals?What are limitations to HNMR?What are \"lock signals\" in HNMR?
- Q What is the pH of a solution made by dissolving 2.81 grams ofcalcium fluoride in enough water to make 450 mL of solution? The Kafor HF is 6.8x10–4.Write a chemical...
- Q 1. Some commercial drain cleaners contain a mixture of sodiumhydroxide and aluminum powder. When the mixture is poured down aclogged drain, the following reaction occurs: 2NaOH(aq) + 2Al(s) +6H2O(l) →...
- Q Predict whether each of the following solvents ismiscible or immiscible with water.ethanol C2H5OHtoluene C7H8trichloroethylene C2HCl3acetic acid CH3COOHPlease show work on how to determine miscibility. Anddetermining how it is polar or...
- Q Suppose that the partition coefficient for an amine, B, is K =3.0 and the acid dissociation constant for BH+ is Ka = 1.0 x 10−9.If 50.0 mL of 0.010 M...
- Q When calcium carbonate is added to hydrochloric acid, carbondioxide, and water are produced.CaCO3(s)+2HCl(aq)--->CaCl2(aq)+H2O(l)+CO2(g)a. How many grams of calcium chloride will be produced when27.0g of calcium carbonate are combined with 12.0g...
- Q In polymer Chemistry, Give description on a specificcharacterization method.
- Q A sample of 0.320 M hydroxylamine (HONH2) is reacted with 0.210M HBr solution. How many mL of the HBr would be required to exactlyneutralize 25.0 mL of the HONH2 solution?...
- Q Part AWatch the video on the explosive decomposition of nitrogentriiodide, NI3, and determine which of the following statements arecorrect.Check all that apply.View Available Hint(s)Check all that apply.The enthalpy of NI3...
- Q Complete the stoichiometry table using the starting valuesprovided. reagent molecular weight mass (g) mmoles equivalentsdensity (g/mL) vol. (mL) bromobenzene 0.355 1.993 magnesium 1.501benzophenone 1 diethyl ether 27.063 theoretical producttriphenylmethanol melting...
- Q How many milligrams of magnesium metal must react with excessHCI to produce 50.50 mL of H2 (g), measured at 25 degrees Celsiusand 775 torr? Show all calculations in this problem.Mg...
- Q DQ 11: Given that the solubility product ofPbI2 is expressed as Ksp =[Pb2+][I–]2, calculate theKsp of PbI2 from the concentrationof Pb2+ found in Step 6 of the Data Analysis. (Hint:Think...
- Q Iron(III) oxide reacts with carbon monoxide according to theequation:Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)A reaction mixture initially contains 22.10 g Fe2O3 and 14.00 gCO.Once the reaction has occurred as completely as possible, whatmass (in g)...
- Q 1. Calulate the %(m/v) ad M of a solution made by dissolving .4gof K2SO4 in water and diluting to a volume of 50.00 ML.2. Show (by use of eq. 5)...
- Q Two 2.0-cm-diameter insulating spheres have a 7.00 cm spacebetween them. One sphere is charged to + 70.0 nC , the other to -79.0 nC . Part A What is the...
- Q Consider the titration of 60.0 mL of 0.100 M NH3 Kb= 1.8 x 10^-5with 0.150 M HCl. Calculate the pH after the following volumes oftitrant have been added: 40.5 mL...
- Q Consider a 0.20 M NH4Cl aqueous solution. Rank the followingspecies in the solution from highest to lowest concentration.NH3, Cl-, H2O, NH4+, OH-, H3O+Consider a 0.10 M aqueous solution of sodium...
- Q Why is the mixture of .033 M of H2SO3 and.033 M of NaSO3 not good buffers?
- Q Although coal is no longer the favored energy source, U.S. coalmines still produced close to a billion short tons of coal. Detail5 different forms of coal, including activated carbon, and...
- Q Phosphoric acid is a triprotic acid (Ka1 = 6.9× 10–3, Ka2 = 6.2×10–8, and Ka3 = 4.8× 10–13). To find the pH of a buffer composed ofH2PO4–(aq) and HPO42–(aq), which...
- Q Glycine, C2H5O2N, is important for biological energy. Thecombustion reaction of glycine is described by the followingthermochemical equation. 4C2H5O2N(s) + 9O2(g) → 8CO2(g) + 10H2O(l)+ 2N2(g) ΔH°rxn=-3857 kj/mol. What is the...
- Q What mass of ammonium chloride should be added to 2.45 L of a0.165 M NH3 in order to obtain a buffer with a pH of 9.65?
- Q For each of the following, what is AE, NE, Lewis structure,VSEPR sketch, VB sketch, geometry description, and bondingdescription? OF2 H3O+ PCL3 H2O2 CH2O N2 CO2 O3 NO3- NO2 PCl5 SiF62-...
- Q Physical Chemistry118.0 g acetylene (ethyne) exists as a liquid T=-84C which isthe liquids boiling point. The liquid boils. The resulting gas(ideal) is heated to 10C and is isothermally compressed from...
- Q (a) A commercial 737 jet transporting 143 passengers and 5 crewmembers from Kansas City to Baltimore burned 11,800 lbs. (about1700 gallons) of Jet A fuel en route. Jet A fuel...
- Q (¶) Provide a component diagram sketch of a typical gaschromatography instrument setup and discuss the importance of eachcomponent.
- Q 9. Which of the following solutions has the greatest bufferingcapacity?  [A] 0.243 M HF and 0.192 M NaF  [B] 0.485 M HF and 0.383 M NaF  [C] 0.970 M HF...
- Q An open tubular column with a diameter of 193 um and a staionaryphase thickness on the inner wall of 0.52 um passes unretainedsolute through in 61 s. A particular solute...
- Q a. What ammonia levels are considered normal in an estuarinesystem? What types of toxic effects can it cause? At whatconcentration levels?b. What effects do fluoride ions have on finfish? At...
- Q (assume all thermodynamic quantities refer to the system, exceptwhere indicated)Carbon dioxide sublimes at -78.5 degrees C at 1 bar pressure.When 1 mole of solid carbon dioxide is converted gas at...
- Q Consider an ionic compound, MX2 , composed of generic metal Mand generic, gaseous halogen X . The enthalpy of formation of MX2is Δ?∘f=−677 kJ/mol. The enthalpy of sublimation of M...
- Q I am asked to create a table of reducing potentials by settingANY of the half-cell potential to 0V. Show calculations.My half-cells and their Eocell is :Ag+ + e- = Ag(s)...
- Q A.) Write the equation which describes the reaction betweencrystal violet and hydroxide ion.B.) A solution is prepared by mixing 25.0 mLs of 4.84*10^-6 Mcrystal violet solution with 20.0 mLs of...
- Q Why is the region of the electromagnetic spectrum between 8 and13 um known as the \"atmospheric window\"? Why are gases that absorbthermal IR in this range of particular concern? What...
- Q 1: Select all of factors that affect the rate of a chemicalreaction:A) activation energyB) configuration effectivenessC) Frequency of collisionsD) kinetic energy of colliding particles2) The initial energy that needs to...
- Q What is the enthalpy of the following reactions? Use theappendix in your text book using heat formatino values.1. SO3+ H2O-----H2SO42. 3K2O2+3H2O----6KOH+O33. Fe3O4+8HCL----2FeCl3+FeCl2+4H2O
- Q 10. How much methanol (CH3OH, in grams) can be formedfrom 49.2 mg of hydrogen? Assume excess CO.CO(g) + 2H2(g) →CH3OH(g)-Consider the following balanced chemical equation:2N2H4(g) +N2O4(g) → 3N2(g)+ 4H2O(g)a. How...
- Q Consider the titration of 25.0 mL of 0.175 M cyanicacid, HCNO, with 0.250 M LiOH. The Ka of HCNO is 3.5 * 10^-4.What is the volume of LIOH required to...
- Q A lead-acid battery uses a redox reaction in which lead(0) andlead(IV) are both converted to lead(II). This reaction isfacilitated by the presence of sulfuric acid, H2SO4, as shown bythe reactionPb+PbO2+2H2SO4→2PbSO4+2H2OSuppose...
- Q 1. An electrochemical cell is based on the following twohalf-reactions:Ox: Pb(s)→Pb2+(aq, 0.18 M )+2e−Red: MnO−4(aq, 1.50 M )+4H+(aq,1.8 M )+3e−→MnO2(s)+2H2O(l) Compute the cell potential at 25∘C.2.A concentration cell consists of...
- Q Methanol (CH3OH) is made industrially in two steps from CO andH2. It is so cheap to make that it is being considered for use as aprecursor to hydrocarbon fuels such...
- Q Sodium nitroprusside is ordered at 0.3 mcg/kg/min for a 220-lbpatient. A vial containing 50 mg of sodium nitroprusside in 2 mL isdiluted to 250 mL with NSI and ordered to...
- Q The atmosphere slowly oxidizes hydrocarbons in a number of stepsthat eventually convert the hydrocarbon into carbon dioxide andwater. The overall reactions of a number of such steps for methanegas is...
- Q B.) Enter the net ionic equation representing aqueous aceticacid neutralized by aqueous barium hydroxide. Â Â Express your answer as a balanced net ionic equation. Identifyall of the phases in your answer.\C.)...
- Q Evaluate the physical and chemical methods of waste treatment?How efficient are they in and what is their effect on theenvironment (positive and/or negative)?
- Q If the weight of an unknwon sample is greater than 1g, as it maybe with pottassium phthalate samples of low percentage purity, whydoes this sample need only to be weighed...
- Q \"monoclonal antibody can be used as a therapeuticagent for the treatment of cancer\"- justify the statement with anappropriate example
- Q Acid base titration determination of Na2CO3 in Soda AshCO32- +H+ = HCO3-HCO3- +H+ = H2CO3Buffer by mixing acetic acid and sodium acetate.The comparison indicator solution should match the analyticalsolution at...
- Q In a constant-pressure calorimeter, 75.0 mL of 0.830 M H2SO4 wasadded to 75.0 mL of 0.400 M NaOH. The reaction caused thetemperature of the solution to rise from 21.85 °C...
- Q 2,2,4-trimethylpentaneA) one retrosynthetic analysisB) a reaction scheme showing each of the synthetic steps withstarting materials, products, reagents and conditionsC) a paragraph or so describing the logic of a syntheticstrategy and...
- Q Match the following1[Ar]4s1A. Anion2a probability map for electronsB. Frequency3[Kr]5s24d105p2C. Electrons4[Kr] 5s24d105p6D. Photon5Number of unpaired electrons in ScE. Ground State6Metals form these when they lose an electronF. Excited state7Electrons in the...
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