Chemistry question and answers for October 01, 2023
- Q The hypothetical molecular square H4 is in the D4h point group.(a) Use the 4 1s-orbitals on the H’s involved in s-bonding with themetal as a basis for generating a reducible...
- Q When NO2NO2 is bubbled into water, it is completely converted toHNO3HNO3 and HNO2HNO2:2NO2(g)+H2O(l)→HNO3(aq)+HNO2(aq)Part ACalculate the pHpH in a solution prepared by dissolving 0.0360molmol of NO2NO2 in 1.45 LL of water....
- Q 1.You find to your surprise that the reaction of phenol withacetic anhydride and aluminum trichloride gives a mixture of twodisubstituted products. Pick the best reason for why.A.The OH oxygen reacts...
- Q A solution of sodium hydroxide was neutralized by sulfuric acid.The volume of sodium hydroxide solution used was 675.0 mL, and theconcentration was 0.875 M. Calculate the moles of sulfuric acidthat...
- Q Temperature: 96.8 oCÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Concentration of HCl solution: 0.04998 MTrial 1Trial 2Trial 3Initial volume of HCl (mL)0.000.000.00Final volume of HCl (mL)3.153.843.37Volume of HCl used (mL)*Moles of Ca(OH)2 (mol)Volume of Ca(OH)2 titrated (mL)10.0010.0010.00*Molar...
- Q How can you apply the knowledge of molecular orbitals to explainbonding between \"hybridization\" orbitals, especially sp3? in words.. thank you!
- Q A beaker with 1.00×102 mL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
- Q Hypoiodous acid, HIO, has an acid dissociation constant of Ka =2.3 x 10-11 .a) What is the useful pH range of a buffer prepared fromhypoiodous acid and its conjugate base,...
- Q a) From the list below, pick an acid, along with its conjugatebase, that can be used to make a pH 7.40 buffer.H3PO4 Ka = 6.9 x 10-3 H2PO4- Ka =...
- Q If a solution of NaOH has a 20% mass percent of NaOH and adensity of 1.22 g/ml, what is the molarity of this solution ?
- Q What is the pH at the equivalence point in the titration of a22.6 mL sample of a 0.371 M aqueous acetic acid solution with a0.353 M aqueous barium hydroxide solution?pH...
- Q 76What is the total sample size (ingrams) for a sample of ethanol (CH3CH2OH) which contains 2.51 g of oxygen?77.What is the total sample size (in grams) for a sample of...
- Q Use your calculated value of Ksp (1.35 x 10^-7) and Kf (1140) toexplain why CdC2O4 is dissolved by ammonia.How would the formation constant for [Cd(NH3)4 +2] be affected(increase, decrease, or...
- Q Draw a schematic diagram for a PerkinElmer ultraviolet-visible spectrophotometer, clearly andspecifically identifying each important part.       b. Drawa schematic diagram for a Shimadzu spectro-fluorometer, clearly andspecifically identifying each important part.     c.Compare a PM...
- Q Calculate the mean activity coefficient(g±) for a 2.0 x 10-3mNa3PO4 solution at 25 ºC.Calculate the activity coefficients (g+ andg-) of each ion for a 2.0 x10-3m Na3PO4 solution at25 ºC...
- Q The decomposition of XY is second order in XY and has a rateconstant of 6.94×10−3 M−1⋅s−1 at a certain temperature.If the initial concentration of XY is 0.160 M , how...
- Q Reaction enthalpy for ethanol oxidation,C2H5OH+3O2 -> 2CO2 +3H2O is 1257 kJ/mole.Energy content per mol fuel______kJÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Energy content per gram fuel = ____________ kJEnergy released per mol CO2formed ________ kJÂ Â Energy released...
- Q a) Explain oxidative addition and carbonyl insertion reactionsin organometallic chemistry withappropriate examples.b) Explain pictorially the σ- and π-bonding in metal-carbonylcompounds and comment on the synergistic effect.c) What are the experimental...
- Q Explain the sublimation and vaporization processes. How does thecondensation process relate to vaporization and how does depositionrelate to sublimation? Give an example of each process
- Q 1. Use this data table for the bromination of acetone to answerthe following questions;Experiment[CH3COCH3] (M)[Br2] (M)[H+] (M)Rate (M s-1)10.30.050.050.00005720.30.100.050.00005730.30.050.100.00012040.40.050.200.00031050.40.050.050.000076a) Determine the reaction order with respect to each of thethree reactants...
- Q For each of the transition metal complex ions(a) [Ti(NH3)6]2+(b) [Cr(H2O)4(OH)2]1-(c) trans–[Pt(CN)2(en)2]2+(i) Draw the structure of the transition metal complex ion. Showthe charge on thecomplex.(ii) Determine the number of d electrons.(iii)...
- Q 1. For the reaction: 2Mg(s) + O2(g) → 2MgO Calculate the percentyield if 10g of Mg and 15g of O2 react, and 15.0g MgO was actuallyobtained.2. For the reaction: H2(g)...
- Q 1) A) Draw the dipeptide Y-C at pH 7 and clearly label thepeptide bond to be broken in the presence of chymotrypsin.B) Draw the five-step mechanism for the chymotrypsin clevage...
- Q calculate the mass percent of oxalate ion in H2C2O4*2H2O and(NH4)2C2O4*H2O
- Q 3. Which of the following is an ortho andpara-director and a deactivator? (10 pts)a. —NHCOCH2CH3 b. —CH2CH2CH3c. —CH2CCl3 d. —COCH2CH2Cle. none of the above
- Q 2.In order to generate charge carriers (charge separation) in organicsemiconductors, why strong donor/acceptor coupling will not workbut weak donor/acceptor coupling is needed (feel free to usediagrams of frontier orbitals)?
- Q When 5.00 g of acetone (C3H6O) burns in air, carbon dioxide gasand liquid water are formed. Enough heat is liberated to increasethe temperature of 1.000 kg of water from 25.0â—¦C...
- Q which of the following yields a buffer solution when equalvolumes of the two solutions are mixed?  A.) 0.10M HCland 0.10M NaCl B.) 0.15M HNO3 and 0.15M NaNO3 C.) 0.10M HF...
- Q A buffer solution contains 0.29 mol of phenol(HC6H5O) and 0.75 mol of sodium phenoxide(NaC6H5O) in 5.20 L.The Ka of phenol (HC6H5O) isKa = 1.3e-10.(a) What is the pH of this...
- Q A Photomultiplier tube can detect a single photon, but aphotodiode cannot. Why is this? As part of your answer sketch themain components of both devices and describe how they work.
- Q Here are the answers for the previous part of this question, ithas multiple parts (these are all at 25 degrees):A) 2CH4(g)→C2H6(g)+H2(g)ΔH∘rxn 64.6 kJB) 2NH3(g)→N2H4(g)+H2(g)ΔH∘rxn 187.2 kJC) N2(g)+O2(g)→2NO(g)ΔH∘rxn 182.6 kJD) 2KClO3(s)→2KCl(s)+3O2(g)ΔH∘rxn...
- Q You can smell the odor of cooking onions from far away. You cansmell the odor of cooking onions from far away. As onions areheated the volume of the gas causing...
- Q Find a specific example of where nuclear power/energy/technologyis being used and write and telling us about your example. Makesure to include the specific element information. State the Isotopename. When was...
- Q Gastric juice (pH 1.5) is produced by pumping HClfrom bloodplasma (pH 7.4) into the stomach. Calculate the amount of freeenergy required to move H+ at 37 °C under cellular conditions?...
- Q Use the table of thermodynamic data in your text, aChemistry/Physics CRC, or the internet (but be careful with dataoff the internet), to calculate the molar enthalpy of the followingreactions:1) An...
- Q Calculate the pH of 0.1 mol/L H2SO4 ; you are given the seconddissociation constant of the acid to be 0.01.
- Q The reaction A(aq) ---> B(aq) + C(aq) is a first orderreaction. The half-life of A(aq) is 86.6 s at 25.0oC andits half-life is 66.2 s at 45.0oC. What is its...
- Q The force constants for the diatomic molecules CO and HI are1860 N/m and 320 N/m respectively.Plot the potential energy curves for these two in a way thathighlights their differences (i.e....
- Q Calculate the pH for 0.80 M N(CH3)3, Kb=2.4x10^-7
- Q 10. Potassium oxalate is a monohydrate salt that formscolorless, odorless crystals. Oxalic acid is a diprotic acid withKa1 = 5.4 x 10-2 and Ka2 = 5.3 x 10-5. (a) If...
- Q A 1.500 Liter vessel is filled with 1.500 moles of hydrogen gas,and 2.500 mol of iodine gas to form hydrogen iodide gas at 448 oC.The reaction has an equilibrium constant...
- Q Draw the titration curve (pH versus mL of NaOH added) that wouldbe obtained from the titration of 30 mL of a 0.10 M solution of anunknown triprotic acid, H3A (Ka1...
- Q 5) A 100.0 mL sample of 0.18 M HClO4 is titrated with 0.27 MLiOH. Determine the pH of the solutiona) before the addition of any LiOH.b) after the addition of...
- Q pH of saltsDetermine if the following salts will raise, lower, or notchange the pH of pure water when dissolved in the water.a) NaCNb) FeCl3c) HCOOHd) K2SO4e) K3PO4f) SrCl2g) (CH3)2NHh) Al(NO3)3i)...
- Q Please define each with credible references:Pauli’s Exclusion Principle:Aufbau Principle:Hund’s Rule:Periodic TrendsAtomic Size:Ionization Energy:Electron Affinity:Metallic Character:
- Q What is the purpose of adding cold water in williamson etherreactions
- Q How would you prove that a silica microsphere made by theStobber process is actually spherical? What affect might deviationsfrom an exact spherical shape have on crystallizing opals and theiroptical properties?
- Q What is the pH for a 400 ml solution of 1.6 M Benzoic Acid?If you added 75 grams of conjugate base (NaC6H5CO2) to thesolution, what would the new pH be?If...
- Q 60.0 mL of 0.100M KOH(aq) is mixed with 40.0 mL of 0.250MHCl(aq) at 25 oC. Assuming that volumes are additive, the pH ofresulting solution is
- Q typing only...Describe how nitrogen can be separated from the other componentsof air.
- Q 3.  (15 pts) For the following calibrationtechniques:  (a) Standard addition, (b) Externalcalibration, and (c) Internal calibration:  Draw apicture of what each graph would look like, describe eachtechnique, and give a reason why each...
- Q What are the experimental procedures for conducting a standardaddition method in analytical chemistry. Why such a method is sopopular in complex sample analysis? Use equations and plots andfigures to explain...
- Q 8H2S(g)+4O2(g)→8H2O(g)+S8(g) Δ[H2S]/Δt = -0.012 M/sa)Find Δ[O2]/Δt.b)Find Δ[H2O]/Δt.c)Find Δ[S8]/Δt.d)Find the rate of the reaction.
- Q 1.00atm of H2 and 1.00atm of Br2 were mixed in a 1.00Lflask at 25°C. Under the appropriate conditions, gaseous HBr willform. At equilibrium, 1.10×10^13 molecules of H2 were found. Giventhe...
- Q A student is asked to determine how many different dyes awater-soluble food coloring contains. Which technique is bestsuited to this task?    (A) paper chromatography    (B) distillation    (C) column chromatography    (D)...
- Q A fuel gas containing 77% methane, 7% ethane and rest propane byvolume. The fuel flows to a combustion chamber at the rate of 1321m^3/h at 15C and 150 kPA (gauge)...
- Q Discuss the results and observations of the data obtained foreach acid. Specifically, discuss how the equivalence point volumesobtained from the different graphs compare to each other and to theendpoint volume...
- Q 1) The boiling point of an aqueous solution is 101.98 ∘C. Whatis the freezing point? Consult the table of colligativeconstants.freezing point:   °C2)Quinine is a natural product extracted from the bark...
- Q When 22.0 mL of a2.08×10-4M ammoniumiodide solution is combined with 18.0 mLof a 5.92×10-4M leadacetate solution does a precipitate form? _____ (yes orno)For these conditions the Reaction Quotient, Q, is...
- Q Consider the following reaction:A(g)⇌2B(g)Find the equilibrium partial pressures of A and B for each of thefollowing different values of Kp. Assume that the initial partialpressure of B in each case...
- Q A15.6g sample of C6H6 reacts with an excess of HNO3. After thelaboratory process, 18.0g of C6H5NO2 are obtained, what is the%yield of the reaction?C6H6 + HNO3 → C6H5NO2 + H2O
- Q calculate the pressure in both atmand mmHg exerted if 20.0 mL of 0.10 M HCl reacts with excessmagnesium in a 125 mL flask at 298 K. What mass of magnesiumreacts?...
- Q Given the following information about Fe in aqueous solutions,what will be the ratio of (Fe(OH)2+) to(Fe(OH)30) in solution at pH 6.0, 6.5, 7.0,7.5, 8.0, 8.5?Fe3+ + 2H2O =Fe(OH)2+ +2H+ logK...
- Q a.A peanut consists of 49.2% oil and 20.8% carbohydrate. (Theremaining mass of the peanut is not combustible.) An average peanuthas a mass of 0.75 grams. Determine the mass of oil...
- Q Give the approximate chemical shifts, the expected peakmultiplicities, and therelative integration for methyl 2-bromopropionate(CH3CHBrCO2CH3).      chemicalshift                  multiplicity                relative integration
- Q 1.) The total pressure (PT) os a sample of a gascollected over water at 13.0oC is 0.588 atm. Determinethe partial pressure (Pi) of the gas.2.) Rearrange the ideal gas equation...
- Q 1.00 g mixture of Na2CO3and K2CO3was titrated with HCl. Theanalysis shows that there are 8.00x10-3moles of CO3-2 ions.Calculate the w/w% Na2CO3in the mixture.please shows the steps
- Q Use Examples 4.16 to determine the  hybridization foreach central atom ( respectively C, C, O, N)in the followingmolecule:CH3COONH2Group of answer choicessp3, sp2, sp2, sp3sp3, sp2, sp, sp2sp3, sp2, sp , sp3dsp3,...
- Q SolutionVoltageTin sulfate-0.010Aluminum sulfate-0.20Ferrous Sulfate-0.60Zinc sulfate-1.01Cell TypeExperimental Potential, VTheoretical Potential, VPercent ErrorCopper-TinCopper AluminumCopper-IronCopper-ZincStandard copper potential = 0.339 V% Error = [100 – (Theoretical/Experimental)] x 100Please help me complete the table above.
- Q Write a balanced ionic equation for 1) the first acid-basereaction of maleic acid and sodium hydroxide, 2) the secondacid-base reaction between C4H3O4-and sodium hydroxide. Finally 3)add the two equations together...
- Q How many ml of both 75% and 5% stock must be combinedto prepare 16 ounces of a 25% product?Answer:Â [a]Â ml of 75% stock (#ml)Round to the nearest whole numberAnswer:Â [b]Â ml of 5%...
- Q Which is the best HPLC mobile phase solvent to use if theanalytes absorb in the UV region of 210 nm? Briefly describe twoother mobile phase characteristics that should be considered...
- Q If the sollubility of sodiym acetate (Molar Mass = 82 g/mol) is76 grams per 100 grams of water, which of the following solutionswould be considered supersaturated (holding more than the...
- Q Difine the Emperical Formula. Draw the set up for thefiltration.
- Q Consider the following equilibrium:Fe(OH)3(s) D Fe3+(aq) +3OH–(aq) with Ksp = 1.6 x10-39. The activity coefficients forFe3+(aq) and 3OH–(aq) are0.445 and 0.900 in a solution with an ionic strength of 0.01M....
Get Answers to Unlimited Questions
Join us to gain access to millions of questions and expert answers. Enjoy exclusive benefits tailored just for you!
Membership Benefits:
- Unlimited Question Access with detailed Answers
- Zin AI - 3 Million Words
- 10 Dall-E 3 Images
- 20 Plot Generations
- Conversation with Dialogue Memory
- No Ads, Ever!
- Access to Our Best AI Platform: Flex AI - Your personal assistant for all your inquiries!