Chemistry question and answers for August 26, 2023
- Q 1.Given the following mole fraction and vapor pressures formiscible liquids A and B, calculate the composition (in molepercentage) of the vapor from a distilling an ideal binary solutionat 150°C and...
- Q protein molecules are polypetide chains are made up of aminoacids in their phisologically functoning or native state thesechains fold in a unique manner such that the nonpolar groups of theamino...
- Q In the qualitative analysis scheme, magnesium and nickelprecipitate from solution upon the addition of sodium hydroxide.Once separated from the remaining cations by filtration ordecanting, the solid mixture is acidified and...
- Q QUESTION 6 Complete combustion of 4.5892 a particular compoundthat contains only carbon, hydrogen and oxygen produces 10.4324 gof CO2 and 4.2705 g of H2O. The empirical formula of the compoundis...
- Q Calculate the pH of a solution that contains .03 g ofNaH2PO4*H2O and .01 g of Na2HPO4*7H2O in 10 mLs.
- Q I have to write out a lab plan for an upcoming experiment! andcomplete the table belowExperiment 9: Introduction to Acids, Bases, and pH LearningObjectives» to gain experience with a wide...
- Q A quantity of 6.732 g of an organic compound is dissolved inwater to make 270.0 ml of solution. The solution has an osmoticpressure of 1.43 atm at 27 C. The...
- Q When a molecule absorbs a photon, what is the process called?When a molecule produces a photon, what is the process called?
- Q 3) What 2 effects does an impurity have on the melting point ofa solid?
- Q A 250.0-mL buffer solution is 0.290 molL−1 in acetic acid and0.290 molL−1 in sodium acetate.Ka(CH3COOH)=1.8×10−5Part AWhat is the initial pH of this solution?Express your answer using two decimal places.Part BWhat...
- Q A steel sample weighing 1.000 g is dissolved in acids andtreated with persulfate and periodate to oxidize Mn toMnO4- and Cr toCr2O7-. The solution is finallydiluted to 100.00 mL in...
- Q List the stabilizing forces at tertiary level of proteinstructure. An enzyme containing the amino aspartic acid(pKa of the side chain = 3.65) and histidine(pKa of the side chain= 6) in...
- Q The first reaction in the Ostwald process for the production ofnitric acid involves the combustion of ammonia4NH3(g)+5O2(g)=4NO(g)+6H2O(g)a) Estimate ΔH^o (in kJ) for this reaction using average bondenergies.b) Calculate ΔH^o (in...
- Q Consider the following reaction:2SO2(g)+O2(g)→2SO3(g)What is the theoretical yield of SO3?If 188.5 mL of SO3 is collected (measured at 327 K and 54.5 mmHg), what is the percent yield for the...
- Q Calculate the percent ionization in each of the followingsolutions. a.) 0.10 M NH3 b.) 0.010 M NH3
- Q Calculate the pH of each of the solutions and the change in pHto 0.01 pH units caused by adding 10.0 mL of 2.67-M HCl to 540. mLof each of the...
- Q #1. Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.200 M HClO(aq) with 0.200 M KOH(aq). Theionization constant of HClO is Ka =...
- Q For the reaction below, Kp = 29.95 at 800 K. Calculate theequilibrium partial pressures of the reactants and products if theinitial pressures are P_PCl5 = 0.3900 atm and P_PCl3 =...
- Q List and describe three pieces of data that support the factthat octahedral complexes undergo dissociative substitution.
- Q Calculate the average thickness of copper on the surface of apenny (produced after 1983) in units of a.) mm and b.) atoms of Cu.Show all calculations, including unit analysis.
- Q Q.3. What kind of post-translational modifications are takingplace on collagen? (there are many. So please check the literaturecarefully). Why are they important for its structure? In terms ofpost translational processing...
- Q Three gases (8.00 g of methane, CH4, 18.0 g of ethane, C2H6, andan unknown amount of propane, C3H8) were added to the same 10.0-Lcontainer. At 23.0 ∘C, the total pressure...
- Q notice that \"SO4\" appears in two different places inthe chemical equation SO-2>4 is a poyatomic ion called sulfate.what number should be placed in front of CaSO4 to give the sametotal...
- Q Use the accepted nomenclature to write the name of thiscompound.[Ag(o-phen)2]NO3
- Q Essay: so what is the Cons of pollution and what can people withbig busniess do to help control the pollution and help ourenviorment?
- Q Calculate the hydronium ion concentration and the pH when 50.0ml of0.40M NH3 is mixed with 50.0ml of 0.40M Hcl
- Q A scientist tries to generate a mixture of gases similar to avolcano by introducing 30.0 g of H20 vapor, 7.5 g of SO2, and 2.0 gof CO2 into a 30.0...
- Q The change in enthalpy for a reaction is -25.8kJ. Theequilibrium constant for the reaction is 1400 at 25 degreesCelsius. What is the equilibrium constant at 382 degreesCelsius?
- Q What distance does electromagnetic radiation travel in 10.2 fs ?Express your answer using three significant figures.Part AWhat is the frequency of radiation that has a wavelength of 11μm , about...
- Q The dibasic compound B (pKb1 = 4.00, pKb2 = 8.00) was titratedwith 1.00 M HCl. The initial solution of B was 0.100 M and had avolume of 100.0 mL. Find...
- Q To convert from a given quantity of one reactant or product tothe quantity of another reactant or product: First, convert thegiven quantity to moles. Use molar masses to convert masses...
- Q Using the following balance equation P4 (s) +6F2 (g) ----> 4PF3 (g)What mass of F2 is needed to produce 120. g ofPF3 if the reaction has a 78.1% yield?
- Q Predict the products for the following reactions. If no reactionwill occur, write NR. Remember to balance all reactions and includestates of matter.1.) Cu^2+ (aq) + Au (s) -->2. Ni^2+ (aq)...
- Q When magnesium metal and an aqueous solution of hydrochloricacid combine, they produce an aqueous solution of magnesiumchloride and hydrogen gas. Using the equation, Mg (s) + 2HCl (aq) →MgCl2 (aq)...
- Q NO3-(aq)+4H+(aq)+3e->NO(g)+2H2O(l)E=0.96VClO2(g)+e->ClO2-(aq)E=0.95VCu2+(aq)+2e->Cu(s)E=0.34V2H+(aq)+2e->H2(g)E=0.00VPb2+(aq)+2e->Pb(s)E=-0.13VFe2+(aq)+2e->Fe(s)E=-0.45VUse appropriate data to calculate E?cell for thereaction.3Cu(s)+2NO3-(aq)+8H+(aq)->3Cu2+(aq)+2NO(g)+4H2O(l)Express your answer using two decimalplaces.
- Q 14. Define the following in your own wordsSpecific heat capacityState functionStandard StateEnthalpy changeHeatTemperature
- Q The following questions refer to the following system: 500.0 mLof 0.020 M Mn(NO3)2 are mixed with1.0 L of 1.0 M Na2C2O4.The oxalate ion, C2O4, acts as a ligand toform a...
- Q protein molecules are polypetide chains are made up of aminoacids in their phisologically functoning or native state thesechains fold in a unique manner such that the nonpolar groups of theamino...
- Q 1) Ringer's injection contain 0.86% of sodium chloride, 0.03% ofpotassium chloride, and 0.033% of calcium chloride dihydrate.Calculate the sodium, potassium, calcium, and chloride content inmEq/L.2). If a liter of an...
- Q A solution contains 0.1 m total carbonate (H2CO3 + HCO3- +CO32-).a. If the pH is 6, find the concentration of each carbonatespecies present.b. If the solution contains also 10-4 m...
- Q Use average atomic masses to calculate the number of moles ofthe element present in each of the following samples.(a) 66.76 g of fluorine atoms(b) 405.0 mg of mercury(c) 84.04 g...
- Q 2) The ferrous ion-orthophenanthroline complex can be used toanalyze for Fe(II) by using the absorption of this complex at 508nm. A group of samples is known to contain between 0.1...
- Q i need to design the experiment for 5th and 6th grade students,the experiment also should exciting the student , please do copyand paste from the internet. with all of these...
- Q Starting with 7.2 g of salicylic acid, how many grams ofacetylsalicylic acid (theoretical yield) can be made? Assumesalicylic acid is the limiting reagent and a one to onestoichiometry. Use the...
- Q Ascorbic acid( C6H8O6) is a diprotic acid. (ka1=6.8*10^-5,ka2=2.7*10^-12)What is the pH of a solution that contains 4.4 mg of acid permilliliter of solution?
- Q A sample of THAM primary standard base weighed 0.9180 grams.After dissolving in 100ml deionized water and adding four drops ofbrom-cresol-green indicator, an HCl solution was added graduallyuntil a definite color...
- Q what is thE ph forA. 0.021 M hno2 at 25 degrees with ka of 4.3*10^-4B. .15 M nh2ch5 at 25 with kb of 5.4*10^-5C. .45 m k2so4 at 25 with...
- Q If 500 mg of Fe3+ and 50 mg of OH- areadded to 1L of pure water, what will be the final equilibriumconcentration of Fe3+ and OH-. Assume waterdoes not dissociate.Fe(OH)3...
- Q Hello,In an experiment to determine the concentration of glucose in asample, we are supposed to make a glucose assay with glucosesolutions of known concentration. The absorbance for each solutionof known...
- Q Given the following sequence: LHYEAIAKAWNDAFa. Classify each amino acid into polar, non-polar, & charged(at pH 7.0)–put a letter above each to show if polar (p), non-polar(n), or charged (c).b.What are...
- Q Determine the pH of an HF solution of each ofthe following concentrations.Part A: .280 MPartB : 4.5*10^-2 MPart C: 2*10^-2Part DIn which cases can you not make the simplifying assumption...
- Q Q1. A compound was characterized using UV-visible absorptionspectroscopy. The absorbance spectrum of a 1.00 x 10–4 mol/Lsolution in a 1.00 cm path length cell peaked at the wavelength of345 nm...
- Q Aspirin is produced by the reaction of salicylic acid (C7H6O3 .M = 138.1 g/mol) and acetic anhydride(C4H6O3, M =102.1 g/mol).                 C7H6O3(s) + C4H6O3(l) → C9H8O4(s) + C2H4O2(l)If 2.04 g of C9H8O4...
- Q Describe Chemical stoichiometry, The conversion of grams of anelement and compound to mole, relation of balanced equation withstoichiometric ratio between reactants and products, limitingreagent and percent yield.
- Q Give the hexapeptide sequence that gives the following fragmentson limited acid hydrolysis:Use the single letter abbreviations for amino acids.Fragment 1: Pro-Leu-GlyFragment 2: Arg-ProFragment 3: Gly-Ile-ValHexapeptide:
- Q A student creates 150ml of a buffer that is .018M in formic acidand .016M in sodium formate. What would the pH of the buffer beafter the addition 15ml of .070M...
- Q Solve an equilibrium problem (using an ICE table) to calculatethe pH of each of the following solutions.a) 0.13 mol*L−1 CH3NH2b) 0.13 mol*L−1 CH3NH3Clc)a mixture that is 0.13 molL−1 in CH3NH2and...
- Q A student ran two separate substitution reactions,Reaction A and Reaction B, in lab that utilized an alkyl halide anda nucleophile. However, he did not know if the reactions proceededthrough an...
- Q Carbon monoxide at 25C and saturated steam at 150C are fed to acontinuous water-shift reactor. The product gas, which contains40.0 mole% H2, 40.0 mole% CO2 and the rest H2O(v) emerges...
- Q Complete thestoichiometry table using the starting values provided.reagentmolecularweightmass (g)mmolesequivalentsdensity(g/mL)vol.(mL)bromobenzene0.4482.122magnesium1.358benzophenone1diethyl ether28.161theoretical producttriphenylmethanolmelting point of triphenylmethanol(°C)Select the name of the catalyst used for thisreaction, if there was no catalyst used, select none:bromobenzenemagnesiumbenzophenonediethylethernone
- Q Please post a detailed explaination:Compare and contrast the actions of ribonuclease and restrictionenzymes as to substrate choice and mechanism. Show how theirstrategies are similar, but also why they must use...
- Q Chemical Engineering Question100 mol/minute of propane gas is burned completely in acontinuous reactor with air to form carbon dioxide and water.Develop an Excel spreadsheet to calculate the adiabatic flametemperature if...
- Q Determination of an Equilibrium Constant1.   What is meant bya reversible reaction?2.  True or False :     Thenumerical value of the equilibrium constant for                  a given...
- Q An enzymatic reaction was analyzed for rate versus substrateconcentration. Roughly estimate the Vmax and Km from thesemeasurements. (Hint: Slope = rise/run and remember what Kmrepresents!)vo(nM/s)Â Â Â Â Â Â Â Â Â Â [S] (nM)30Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 100,00029.5Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 10,00029Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1,00028Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 200Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 25Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 15020Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 10010Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 505Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 20a. Vmax = 10 nM/s,...
- Q The combustion of liquid ethanol (C2H5OH) produces carbondioxide and water. After 4.61 mL of ethanol (density=0.789g/ml) wasallowed to burn in the presence of 15.70 g of oxygen gas, 3.71 mLof...
- Q Please use the values in the resources listed below insteadof the textbook values.Balance the following in acidic solution. (Omit states-of-matterfrom your answer. Use the lowest possible whole numbercoefficients.)(a)Ti + Cr2O72−...
- Q Calculate the pH during titration of 25 mL of 0.175 M HCN with0.3 M NaOH after the addition of 0 mL, 7.29mL, 14.5833 mL, and 20mL base. Kb of CN-...
- Q You are given a sample containing a hydrocarbon and an amine -both compounds are very insoluble in water and very soluble indiethyl ether. Describe how you could efficiently separate thesetwo...
- Q If the Kb of a weak base is 3.8 × 10-6, what is the pH of a 0.39M solution of this base?
- Q How many grams of sodium lactate (MW = 112 g/mol) are requiredto prepare 200 ml solution at 1.0 M? Given pKa of lactic acid =3.86, what is the pH of...
- Q A 4.50 mL sample of a 0.100 M solution of an aromatichydrocarbon dissolved in hexane is excited with a flash of light.The aromatic compound emits 19.3 J of energy at...
- Q Explain how the induced, orientation, and dipersion interactionstrend between HCl, HBr, and HI. Why do the dipersion interactionsincrease from HCl to HI? Why do the orientation interactionsdecrease from HCl to...
- Q A certain weak acid, HA, has a Ka value of7.3
- Q At 1 atm, how much energy is required to heat 93.0 g ofH2O(s) at -14.0 degrees C to H2O(g) at 141.0degrees C?
- Q 1)The data below were collected for the followingreaction:CH3Cl(g)+3Cl2(g)→CCl4(g)+3HCl(g)[CH3Cl](M)[Cl2](M)Initial Rate (M/s)0.0500.0500.0140.1000.0500.0290.1000.1000.0410.2000.2000.115ACalculate the value of the rate constant, k.Express your answer using two significant figures.BWhat is the overall order of the reaction?Express...
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