Chemistry question and answers for August 25, 2023
- Q Using ICE tables and acid-base equations, compare the change inpH that occurs when 10 mL of a 0.10 M NaOH is added to 100 mL ofpure water, and when it...
- Q A 500 mL saturated solution of MgCO3 (MM =84.3 g/mol) is reduced to 120 mL by evaporation. What mass of solidMgCO3 is formed? Ksp = 4.0 x 10-5for MgCO3.EDIT: If...
- Q 1. a. What is the pH of a solution formed by combining 50.00 mLof a 0.0855 M acetic acid solution, 25.00 mL of 0.1061 M NaOHsolution and 25.00 mL of...
- Q The following are some calculation questions related to theexperiment. Please include the questions and their answers in yourreport:a) A 0.05 L solution of 0.5 mol/L NaOH was titrated untilneutralized into...
- Q For analysis of a calcium sample, it is desirable to obtain aprecipitate weighingabout 0.50g. What size sample should be takenfrom a mixture which isapproximately 56% CaO?
- Q Calculate the pH of a solution composed of 0.50 M NH3 and 0.20M NH4Cl. Kb NH3 = 1.8 x 10-5
- Q The titration process is used to analyze the content of somefood product. Let's say you are analyzing the concentration ofacetic acid in the vinegar. Answer the following question:• What would...
- Q A) Consider the reaction2N2(g) +O2(g) --->2N2O(g)Using the standard thermodynamic data in the tables linked above,calculate deltaGrxn for this reaction at 298.15K if thepressure of each gas is 35.48 mm Hg.______...
- Q The chief compound in marble is CaCO3. However, marble isreadily attacked by acids.[Ca2+] in normal rainwater of pH 5.0 = 0.024 Ma) Determine the molar solubility of marble (that is,...
- Q Draw the molecular orbital diagram for the valence electrons inH2O. Using the electron configuration and the Walsh correlationdiagram, explain why H2O is bent and not linear.
- Q What is the glycal assembly method?
- Q 5. How many kJ of energy are required to change 1.00 m^3 of purewater by 1.0*C? Assume a perfect system. The specific heat of thewater is 4.184 J/g*C. The density...
- Q A liter of pH 7.20 phosphate buffer is needed for a certainexperiment. The Henderson-Hasselbach equation will be sufficientlyaccurate for your determination of pH. The pK’s for possiblyrelevant phosphate species are:H3PO4...
- Q 3. Consider the following possible ligands. For which ofthese do you expect back-bonding to be significant in theircomplexes? For those that you do not expect to participate inback-bonding, explain why.H2Â Â ...
- Q What is the pH of a 0.136 M monoprotic acid whose Ka is 5.710-4?
- Q he decomposition of ozone in the upper atmosphere is facilitatedby NO. The overall reaction and the rate law are O3(g)+O(g)→2O2(g)Rate=k[O3][NO] Write a mechanism that is consistent with the ratelaw.
- Q Dinitrogen Pentoxide (N2O5) decomposes in chloroform as asolvent to yield NO2 and O2. The decomposition is first order witha rate constatnt at 50 degrees Celcius 1.75 x 10-5 s-1.Calculate the...
- Q Calculate the pH of the 0.250 M NH3/0.5 M NH4Cl buffer system. Whatis the pH after the addition of 2.0 mL of 0.250 M NaOH to 18.0 mLof the buffer...
- Q A 25.0 mL sample of 0.125 molL−1 pyridine (Kb=1.7×10−9)is titrated with 0.100 molL−1HCl.Part ACalculate the pH at 0 mL of added acid.Express your answer using two decimal places.Part BCalculate the...
- Q I have to estimate, to the nearest degree, the temp. at whichthe vapor pressure of a solution (3.9g benzene, 4.6g toluene)reaches 1 atm. I believe the mole fractions are .73...
- Q _____1.0.15 mNa2SÂ Â A.Highest boiling point_____2.0.11 mCr2(SO4)3B.Second highest boilingpoint_____3.0.17 mMnCl2C.Third highest boiling point_____4.0.47 mGlucose(nonelectrolyte)D.Lowest boiling point
- Q The pKb values for the dibasic base B are pKb1 = 2.10 and pKb2 =7.59. Calculate the pH at each of the following points in thetitration of 50.0 mL of...
- Q Consider a hydrogen atom following the Bohr model.A) What are the four lowest energy levels?B) How many different types of photons are observed astransitions between these levels?C) What are the...
- Q Calculate the theoretical and percent yield of terephthalicacid, based on PET being the limiting reagent.MW terephthalic acid= 166.13 g/molMW PET= 192 g/molMass of product = 0.76 g
- Q Why is H2 more acidic than NH3?
- Q BIOCHEMPLEASE ONLY ANSWER IF YOU TRULY UNDERSTAND IT!! I postedthis many times, and people have been giving wrong answers. AlsoONLY answer if you can answer it correctly and FULLY. Also...
- Q The reaction of nitric oxide (NO(g)) with molecular hydrogen(H2(g)) results in the formation of nitrogen and water as follows:2NO (g) + 2H2(g)...> N2(g) + 2H2O(g) The experimentallydetermined rate-law expression for...
- Q PLEASE DO ALL .The solubility of silver bromate (mm( AgBrO3) = 235 g/mole)is determined to be 0.0072g/lA.write the equation for the dissociation of silver bromatein waterB. Predict the sign for...
- Q If the volumetric procedure yields more accurate results, whyperform the gravimetric procedure at all?
- Q Hydrogen with 1s^2 would be similar to what other elements? Isthis element paramagnetic?
- Q Consider the combustion of methane in oxygen (a reaction we'veseen when we've lit soap bubbles on fire), which is a highlyexothermic reaction.True or False - Once the activation energy has...
- Q Consider the reaction of I2 (g) described by I2 (g) = 2 I (g).The total pressure and partial pressure of I2 (g) at14000C have been measured to be 36.0 torr...
- Q To a 150.0mL volumetric flask are added 1.00 mL volumes of threesolutions: 0.0100 M AgNO3, 0.225 M NaBr, and 0.100 MNaCN. The mixture is diluted with deionized water to the...
- Q A 150.0 mL gas tank contains 51.2 g of oxygen gas and 32.6 ghelium gas. What is the total pressure in the tank? What is thepartial pressure of oxygen?
- Q NADH and FADH2 are often considered “energy currency†incellular metabolism because they are generateddirectly from Glycolysis and the TCA cycle. Using the followinghalf-cell potentials, calculate the Gibbs Free Energythat can...
- Q A. Calculate the solubility of silver chloride in a solutionthat is 0.150.B. 120.0 −mL sample of a solution that is 2.8×10−3 M in AgNO3 ismixed with a 225.0 −mL sample...
- Q How do you calculate the molarity of 40 mL of 0.1M acetic acid(HC2H3O2) solution if 12.76 mL 0.35 NaOH was added to reach theequivalence point?
- Q What is the molar concentration of Na+ ions in 0.015M solutions of the following sodium salts in water?(a) NaBr(b) Na2SO4(c) Na3PO4
- Q I need some practice questions for Stoichiometry. The softwaremy class uses for reviewing is mediocre at best. HELP! pleaselol
- Q Explain why mixing of a D4h component in with aTd ground state lowers the magnetic moment in nickel(II)complexes.
- Q 3. Recall the steel phase diagram where ferrite iron had a max Csolid solubility of 0.022 wt% Cbut austenite could take up to 2.14wt% C! The carbon solubility in iron...
- Q Calculate the [Ag+] in a solution prepared bydissolving 1.00g of AgNO3 and 10.0g KCN in enough waterto make a 1.00 L of solutionKf[Ag(CN)2]1-=1.0 x 1021Answer: [Ag+] = 2.9 x 10-22M
- Q Given: 50 ml of 0.2 M weak acid is titrated with 0.2M NaOH. Thepka of the acid is 4.71. What is the pH at the equivalence point?2. What is the...
- Q What mass of Cu(OH)2 (MM= 97.56 g/mol) will dissolve in ,500 Lof a pH solution (Ksp=2.2*10 ^=20). In which solution is Cu(OH)2most soluble and least soluble: A. .01 M NaCl,...
- Q How much heat is required to convert 84.9 g of ice at -17.0 C tosteam at 114 C?
- Q For a magnesium fluoride, MgF2, Ksp= 6.4x10^-9, calculate themolar solubility in pure water.Calculate the molar solubility in 0.050 M NaF solution.Please show step by step instructions, thank you!
- Q 1. The carboxylic acid group of an amino acid has a pKa ofapproximately 2. However, carboxylic acids like benzoic acid andacetic acid have pKas in the range of 4-5 pKa...
- Q Mass spectrometryYou examine the MS data from a GC-MS analysis. You notice thereis quite a lot of fragmentation but are ansure if the molecular ionis visible.Explain,in detail,why this might be...
- Q 500kgh-1 of a 10% w/w solutionof a compoun X(OH)2 is to betreated using a 5% excess of 20% w/w solution of Na2CO3 toprecipitate the X as its carbonate according to...
- Q Consider the equation:3CuO(s)+2NH3(g)--->N2(g)+3Cu(s)+3H2O(l)How many moles of nitrogen gas could be made from:a) 5.00 Mol CuO and 2.00 mol NH3b) 6.00 mol CuO and 6.00 mol NH3
- Q A.)Use the steady-state approximationB.)And the rate determining step approximation to derive the rate equation.The gas-phase decomposition of ozone,2O3 ->3O2, is believedto have the mechanism. M is any molecule.  Compare thethe...
- Q Inorganic Chem: Please show neat, well explainedanswerHomogeneous CatalysisExplain why Rh(PPh3)3Cl rapidly undergoesoxidative addition reactions.There is 50,000 times more cobalt available in the Earth’scrust. Why don’t we use Co(PPh3)3Cl foralkene hydrogenation?
- Q Prelab to accompany bromination of trans-cinnamic acid(4 pts each)The stoichiometry of the addition is 1:1, meaning that for everyone mole of transcinnamic acid, one mole of Br2 is needed to...
- Q Over the course of the semester, we studied several techniques(spectrophotometry, acid-base titrations, redox experiments) toanswer questions related to quantification and identification ofcompounds, kinetics of chemical reactions,and equilibriumconstants. With some background...
- Q If you add a 1 cm3 (1 ml) cube of salt (density 2.16g/cm3) to 10 ml of water (1 g/cm3) what is areasonable total volume?If you add a 1 cm3...
- Q Please describe in detail the mechanism for the formation of2R,3S/2S,3R-2,3-dibromo-3-phenylpropanoic acid. Based on thestereochemistry of bromine addition.Please, don't only use drawings (although they can be of help),i would pefer it...
- Q Ammonium nitrate is the most commercially important chemicalproduct containing the ammonium ion.1.List and describe at least two grades of commerciallyavailable ammonium nitrate..2.Why does OSHA require employers to store bulk quantities...
- Q A voltaic cell consists of a Pb/Pb2+ half-cell and a Cu/Cu2+half-cell at 25 ?C. The initial concentrations of Pb2+ and Cu2+ are5.30
- Q A gas mixture in a 1.00L reaction vessel at 100ºC contains 4.5mol of Br(g) and 33.1 mol F2(g). Compte the mole fraction of eachgas in this mixture.When this mixture is...
- Q In a titration of 47.76 mL of 0.3886 M nitrous acid with 0.3886M aqueous sodium hydroxide, what is the pH of the solution when47.76 mL of the base have been...
- Q Calculate ΔG° for the following reaction as writtenNi2+ (aq) + Sn (s) → Ni (s) + Sn2+(aq)given the following reduction half-reactions and standardreduction potentials.Sn2+ (aq) + 2 e- → Sn...
- Q A rigid container whose volume can be varied with the use of apiston contains 2.53 mol H2 gas at STP.(a) What is the volume of the gas?_____L(b) The container is...
- Q What is the molar solubility of AgCl in 0.1 M HCl? How manygrams of silver chloride will dissolve in 500 mL of 0.1 M HCl? showall calculations
- Q Calculate the density of oxygen, O 2 , under each of thefollowing conditions: STP 1.00 atm and 35.0 ∘ C Express youranswers numerically in grams per liter. Enter the density...
- Q identify and then write the balance chemical equation for eachsalt below that will yield a basic solution in wateri. NH4Br ii. NaCN iii. BaF2 iv. NaNO3
- Q You are shoveling bituminous Pennsylvania coal (with an energycontent of 13,870 Btu/lb) from a coal box into a furnace. Onaverage, with each lift and throw, you raise a 1.8 kg...
- Q a. Use standard cell potentials to show what reaction wouldoccur if you placed a strip of Cr in a solution of equalconcentrations of NiCl2 and Al(NO3)3.b. Zinc is plated onto...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). Theionization constant for HClO can be found here.(a)...
- Q NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl actsas a weak acid. What is the pH of a solution that is 0.038 M...
- Q A total volume of 33.15-mL of 0.1053-M NaOH is needed to titrate24.5-mL of benzoic acid. (Benzoic acid is a monoprotic acid with apKa = 4.20). Determine the pH when the...
- Q What is the E cell for the following1.) magnesium and zinc2.) magnesium and copper3.) copper and zinc4.) 1 M Cu2+ and 0.01 M Cu2+
- Q If a solution containing 39.544 g of mercury(II) perchlorate isallowed to react completely with a solution containing 13.180 g ofsodium dichromate, how many grams of solid precipitate will beformed?How many...
- 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 2.05-M HCl to 570. mLof each of the...
- Q Benzene and ethylbenze are to be separated in a single-stageflash vessel. The resulting liquid stream must have a compositionof x1= 0.35 and the resulting vapor stream must have acomposition of...
- Q When a bicyclic (or even polycyclic) compound such as ß-Naphtholis being brominated via EAS, how do I determine the locations onthe molecule that will be substituted with bromine in the...
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