Chemistry question and answers for July 21, 2023
- Q Complete the following acid-base reaction with balancedmolecular, total ioic, and net ionic equations. calciumhydroxide(aq) + acetic acid(aq) =Molecular:Total ionic: ReactantsProductsNet Ionic:
- Q 100 mL of a river water sample took 9.30 mL of 0.01005 M Ag+ totitrate. Calculate the concentration of Cl- in ppm (μg/mL or mg/L)for the river water.
- Q A copper, Cu(s), electrode is immersed in a solution that is1.00 M in ammonia, NH3, and 1.00 M in tetraamminecopper(II),[Cu(NH3)4]^{2+}. If a standard hydrogen electrode is used as thecathode, the...
- Q Which of the following parameters would be different for areaction carried out in the presence of a catalyst, compared withthe same reaction carried out in the absence of a catalyst?ΔG∘,...
- Q The following question is offered in anticipation of ourchapters on metabolism: Assuming that the average weight of anadult is 154 lbs, how many molecules arrive each second at amitochondrion of...
- Q Calculate the concentration of all species in a 0.19 M KFsolution.Please dont do it wrong its been wrong all over the internet andit makes no sense
- Q Basic understanding how double bonds absorb light. Overallchemical reaction of ‘fixing’ carbon dioxide.
- Q The choice of an appropriate solvent is crucial for a successfulrecrystillization. Describe how you will determine the properrecrystillization solvent for the Aldol product.
- Q Combustion analysis of 17.471 g of trioxane produces 10.477 g ofwater and 25.612 g of carbon dioxide. The molar mass of trioxane isapproximately 90. g/mol. Determine the molecular formula of...
- Q Please explain the science behind fuel alternatives; biodiesel,ethanol and MTBE.
- Q state the four quantum numbers then explain the possiblevalues they may have and what they actually represent
- Q Part ACalculate Kc for the reaction below.I2(g)⇌2I(g)Kp=6.26×10−22 (at 298 K)Express your answer using three significant figures.Kc=?Part BCalculate Kc for the reaction below.CH4(g)+H2O(g)⇌CO(g)+3H2(g)Kp=7.7×1024(at 298 K)Express your answer using two significant figures.Kc=
- Q Consider an ideal monatomic gas og N indistinguishableparticles, mass m each and total energy U, confined to a onedimnensional channel of length L.Calculate the multiplicity of the 1-D gas and...
- Q I posted this exact question a few days ago and some doofus saidit wasn't clear. I don't know how to make it any more clear. Thisis all the information the...
- Q In the lab,1. we put sodium oxalate into lead nitrate2. we put sulphuric acid into lead nitrateAfter both solution has precipated, we removed the liquids andpour nitric acid to each...
- Q You prepare a 0.200M solution of a monoprotic buffer at pH 7.22.The pKa of this buffer is 7.53 at room temperature.a. What is the molarity of the acid and conjugate...
- Q Consider the titration of a 28.0 −mL sample of 0.175 M CH3NH2with 0.155 M HBr. Determine each of the following. 1. the inital pH2. the volume of added acid required...
- Q about this time you may be wishing you had an aspirin. Aspirinis an organic acid with a ka of 3.27E-4 for the reactionHC9H7O4(aq) +H2O(L) <--> C9H7O4-(aq) +H3O+(aq) If you havetwo...
- Q Calculate the pH of 100.0 mL of a buffer that is 0.050 M NH4Cland 0.180 M NH3 before and after the addition of 1.00 mL of 5.70 MHNO3.Before =After=
- Q What is the percent dissociation of HX (pKa = 4.30) in a 0.380 Msolution?________ %
- Q Suppose a 500.mL flask is filled with 1.5mol of CO , 0.60mol ofH2O and 1.8mol of CO2 . The following reaction becomes possible:+COgH2Og +CO2gH2g The equilibrium constant K for this...
- Q Rank the following atoms in the order of decreasing electronaffinity. Li, Si, Mg, S
- Q Assume you dissolve 0.235 g of the weak acid benzoic acid,C6H5CO2H, in enough water to make 3.00 ✕ 102 mL of solution andthen titrate the solution with 0.133 M NaOH....
- Q A sample of 7.70 L of NH3 (ammonia) gas at 22 ∘C and 735 torr isbubbled into a 0.400 L solution of 0.400 M HCl (hydrochloric acid).The Kb value for...
- Q Part ACalculate the change in pH that results from adding 0.190 molNaNO2 to 1.00 L of 0.190 M HNO2(aq). (Ka(HNO2)=7.2⋅10−4) Expressyour answer using two decimal places.Part BCalculate the change in...
- Q When creating a titration curve for a weak base, the pH of theinitial solution requires setting up a table showing the initial,change, and equilibrium values for each species and plugging...
- Q 1) Consider thereaction:A (aq) ⇌ B (aq)at 253 K where the initial concentration of A = 1.00 M and theinitial concentration of B = 0.000 M. At equilibrium it is...
- Q Draw a simple molecular orbital diagram for the followingmolecules. O22....N2+.... C22- '''a. Is the ionparamagnetic or diamagnetic? b. What is the bond order in the ion?c. Would these ions have...
- Q When 22.63 mL of aqueous NaOH was added to 1.136 g ofcyclohexylaminoethanesulfonic acid (FM 207.29, pKa =9.39, structure in the table) dissolved in 41.37 mL of water, thepH was 9.24....
- Q Compound A is a D-aldopentose that can be oxidized to anoptically active aldaric acid B. On Kiliani-Fischer chainextension, A is converted into C and D; C can be oxidized to...
- Q Which of the following correctly characterizes the reactivityand/or use of free radicals?Free radicals are used in the conversion of liquid resins intosolid plastics.Free radicals are generally stable molecules found in...
- Q Calculate the PH of 1.00 L of a buffer that is 0.130 M HNO2 and0.170 M NaNO2. What is the PH of the same buffer after the additionof 1.00 mL...
- Q Calculate the change in pH when 0.28 mol H+ is added to 1.00 Lof each of the following buffers:(a) A 0.58 M solution of pyridine (py) containing 0.52 MpyH+(b) A...
- Q In the following problems answer is given in bracket, Ijust want the steps how to get them:(a). Calculate the % of each DRY product whencoal is burned stoichiometrically in air....
- Q How do I calculate the inicial concentration of​​ I^-and S2O8^2- in each mixture, the reaction rate M/s, and the k value(rate constant) from the following data???? IODINE CLOCKREACTIONRun #3% Starch0.012...
- Q TLC (thin layer chromatography), how does it work? How wouldchanging the stationary vs mobile phase effect the movement ofmolecules?
- Q consider the following reaction at equilibrium: 4 NH3 + 5 O2<---> 4 NO + 6 H2O. What would happen to the position of theequilibrium if:a) more oxygen is addedb) the...
- Q Find the ΔG of the following reaction when there is 1.64 M A insolution. The equilibrium concentrations were found to be 1.00 M A,0.97 M B, 1.07 M C, 0.55...
- Q A 19.3-g mixture of oxygen and argon is found to occupy a volumeof 16.2 L when measured at 675.9 mmHg and 43.4oC. Whatis the partial pressure of oxygen in this...
- Q If 1 grams of sodium bicarbonate are decomposed, determine thecombined mass loss (in grams) of water and carbon dioxide that areproduced. When a 1.09g mixture of sodium chlorideand sodium bicarbonate...
- Q 4) In a titration of a 100.0mL 1.00M HA weak acid solution with1.00M NaOH, what is the pH of the solution after the addition of49.5 mL of NaOH? Ka =...
- Q In the titration of 25 mL of 0.100 M N2H2 (Kb=8.9x10-7) with.100M HCl, determine the pH at: Please show all steps/ Help pleaseasapa) the begining of titrationb) after 15 mL...
- Q Describe 2 methods for modifying the biomaterial surface(do not describe grafted polymer layers).For each method, briefly describe thefollowing things:1. How the technique is performed2. Chemistry examples that can be communicated...
- Q Calculate pH of 0.10 M of Na2CO3?
- Q An insultaed container holds 40.30g of water at 23.10celcius.Sample of copper weighing 7.50g is placed in a dry testtube and heated for 30 min in boiling water at 100.10 celsius.given...
- Q classify the following solution as acids, bases orneutral based on their pH valueswatersoda popvomitbattery acidmilkhand soapcoffeebloodorange juicedrain cleanerPart Bclassify each substance as strong acid, strong base, weak acid, orweak baseH2SO4HBrHIH2SO3(CH3)2NHCH3COOHHCLO4H3PO4NAOHLiOHcan(OH)2KOHC6H5COOHNH3
- Q In paragraph form, using 300 to 400 words, discuss the use andvalue of membrane processing in the dairy industry. You need tocite your references here.
- Q How many grams of NaOH are needed to prepare 600.0 mL of asolution with pH = 10.00 at 25 °C?
- Q Balance the half-reactions assuming that they occur in acidicsolution.Express your answer as a balanced half-reaction. Identifyall of the phases in your answer.1) NO3−(aq)→NO(g)2)Zn(s)→Zn2+(aq)3)Te(s)→TeO2(s)4)Sn4+(aq)→Sn2+(aq)
- Q Six halides: 1-chlorobutane, 2-chlorobutane, Allylchloride, 2-chloro-2-methylpropane, 1-chloro-2-methylpropane,2-bromobutane.SN2: w/ sodium iodide in acetoneSN1: w/ silver nitrate in ethanolExplain the order of reactivity under SN2 and SN1conditions by considering alkyl halide structure,...
- Q You are a CEM 262 TA and are preparing a 1.97 M ZnCl2 solutionas an unknown for the EDTA titration experiment. The pH must bebelow what value to avoid precipitation...
- Q Part A) Calculate the solubility (in grams per 1.00×102mL ofsolution) of magnesium hydroxide in a solution buffered atpH = 12. Part B) Calculate the solubility (ingrams per 1.00×102mL of solution)...
- Q 1) At which point along thetitration curve of a weak acid titrated with a strong base does thepH = pKa- At the half equivalence volume- At the equilavence volume- Before...
- Q What is precipitation hardening? Is this a kinetics orthermodynamic process? Explain.
- Q Chemistry 2 Lab question!How is sulfate ion seperated from NO3 - and Cl - ?
- Q Part AThe activation energy of a certain reaction is 39.4kJ/mol . At30 ?C , the rate constant is 0.0190s?1. At what temperature indegrees Celsius would this reaction go twice as...
- Q how many grams of NaOH must be added to 1L of a 0.1 MKH2PO4 to prepare a pH 7.42 buffer. answer given by professor is2.47 I need help understanding how...
- Q how many moles and numbers of ions each type,are present Iin thefollowing aqueous solution? 51.5 ml of 1.55 M magnesiumchlorides
- Q A \"silver\" ring was purchased at a local store. It was stamped\"sterling silver\" which means that it must contain 92.5% by massAg. The remaining 7.5% may technically be any other...
- Q a.1.0.29 mNiSO4A.Lowest freezing point2.0.18 mBaI2B.Second lowest freezingpoint3.0.16 mCuCl2C.Third lowest freezing point4.0.51 mSucrose(nonelectrolyte)D.Highest freezing pointb. Match the following aqueous solutions with theappropriate letter from the column on the right.1.0.16 mCa(NO3)2A.Lowest freezing...
- Q whic of these interactions can be explained by hydrogenbonding.Select all that apply.HF is a weak acid neutralized by NaOH.HF has a higher boiling point than HCl.CH4 molecules interact more closely...
- Q For each of the following solutions, calculate the initial pHand the final pH after adding 0.010 mol of NaOH.a) For 230.0 mL of a buffer solution that is 0.205 M...
- Q The compound sodium thiosulfate pentahydrate,Na2S2O3 · 5 H2O, isimportant commercially to the photography business as \"hypo,\"because it has the ability to dissolve unreacted silver salts fromphotographic film during development. Sodium...
- Q Explain why the addition of a small amount of base to an acidicbuffer solution causes only a small change in the pH of the buffersolution. You should use any appropriate...
- Q Please answer as soon as possible (Chemical Engineering)Given The reactionsC3H8 → C3H6 +H2C3H8 + 2H2 →3CH4The feed contains 90.0 mole% propane(C3H8)and the balance inert. The fractional conversion of propane is0.603...
- Q A well mixed 10m3 closed mixing tank at 18C is usedto dilute 100kg/min of a 2.0% by mass NaClO3 solution toa 0.60% solution by adding water.Part 1) What is the...
- Q The chief compound in marble is CaCO3. Marble has been widelyused for statues and ornamental work on buildings, including suchstructures as the Taj Mahal (Figure 1) . However, marble is...
- Q 1. Where do the typical IR absorption come for the followingfunctional groups.           Alcohol           Alkyl           Alkene           Alkyne           Aromatics           Carboxylic acids2.Where do the typical IR absorption comes for amines?Primary aminesSecondary aminesTertiary amines
- Q Consider the titration of 35.0 mL of 0.260 M HF with 0.215MNaOH. Calculate the pH at each of the following points.Part A.)How many milliliters of base are required to reach...
- Q a. An aqueous solution is made by dissolving18.4 grams of iron(III) bromidein 314 grams of water.  The molality of iron(III) bromide in the solutionis ________m.b.In the laboratory you are asked to...
- Q 1) How many grams of dry NH4Cl need to be added to 2.40 L ofa 0.800 M solution of ammonia, NH3, to prepare a buffer solutionthat has a pH of...
- Q Concentration of acetic acid: 1.041M and concentration of sodiumacetate is 1.071M.The buffer is created by mixing 100mL of acetic acid with 100mLof sodium acetate soluiton.a) What is the pH of...
- Q For one of your trials during the equilibrium experiment at roomtemperature as described in the lab manual. You determine thefollowing for Tube #1 while performing the experiment as describedin the...
- Q Consider the titration of 30.0 mL of 0.0700 M (CH3)2NH (a weakbase; Kb = 0.000540) with 0.100 M HClO4. Calculate the pH after thefollowing volumes of titrant have been added:(a)...
- Q A 71.0 mL sample of 0.0400 M HIO4 is titrated with 0.0800 M RbOHsolution. Calculate the pH after the following volumes of base havebeen added.(a) 10.3 mLpH =(b) 34.4 mLpH...
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