Chemistry question and answers for September 26, 2023
- Q How many unpaired electrons are in the following transitionmetal ions in an octahedral crystal field? Part 1(1 pt) High-spinFe3+ unpaired electron(s) Part 2(1 pt) Cu+ unpaired electron(s)Part 3(1 pt) V3+...
- Q Match the following aqueous solutions with the appropriateletter from the column on the right. Assume complete dissociationof electrolytes.1.0.16 mZn(NO3)2A.Highest boiling point2.0.22 mAgCH3COOB.Second highest boiling point3.0.17 mMn(NO3)2C.Third highest boiling point4.0.46 mUrea...
- Q Rank the following molecules or ions in order of decreasing bondlength using their bond order to predict relative lengths.- oxygen difluoride (bond order = 1)- O2 (bond order = 2)-...
- Q You have available the buffer ADA: disodium salt a) using thebuffer, explain, in some detail including numerical calculations,how to prepare 500ml of a buffer with a pH=6.50 and a totalconcentration...
- Q A-CH3SH reacts with CO according to the following unbalancedchemical equation:CH3SH + CO → CH3CO(SCH3) + H2SCalculate the mass in grams of the excess reagent remainingafter the complete reaction of 2.17...
- Q 13.) Redox chemistry isn’t only for chemists, it’s important inbiology as well. Below are two different redox forms of Vitamin C.Oxygen lone pairs are omitted for clarity. a) Identify theoxidation...
- Q \"Draw the first 5 Brillouin zones of a two-dimensional cubicprimitive reciprocal lattice.\"When we covered this in in an engineering class lecture itseemed like we were just drawing lines on a...
- Q Fe2+ is present at very low concentrations inseawater. The primary source of this iron is Fe(OH)2.The pH of seawater is between 7.4 and 8.3. For this problem assumethat the pH...
- Q Will a precipitate occur when 12.0 mL of 0.00035M silverchlorate and 15.0mL of 0.00150M sodium carbonate are mixed?
- Q Explain, briefly one of the phenomena below and describe how itrelates to quantization of energy. (a) the photoelectric effect OR(b) line (emission) spectra
- Q 1. Use the Henderson-Hasselbalch equation to determine the ratioof base/acid in a formic acid-formate buffer with a pH of 3.002. Assume that the human blood buffer includes, at any onepoint,...
- Q The constant pressure molar heat capacities of linear gaseousmolecules are approximately (7/2)R and those of non-linear gaseousmolecules are approximately 4R. Estimate the change in the standardreaction entropy of the reaction...
- Q What are the critical differences among spectroscopy,spectrometry and spectrophotometry?What kinds of parameters are critical for the physicalproperties of electromagnetic wave radiation?What is the dual property of the light (electromagneticwave)?
- Q The chemical reactions:CuSO4(aq) + Zn(s) → ZnSO4(aq) + Cu(s) Zn(s) + H2SO4(aq) → ZnSO4(aq)+ H2(g) The copper on the surface quickly reacts with oxygenaccording to the following reaction: 2Cu(s) +...
- Q In the laboratory you dissolve 15.0 g ofiron(III) nitrate in a volumetric flask and addwater to a total volume of 250mL.  What is the molarity of the solution?   M.What is the concentration...
- Q 14. Consider the following reaction:2AgCl(s) ï‚® 2Ag(s) + Cl2(g) ï„H° = 127.1 kJ; ï„S° = 115.7 J/K at 298KSuppose 41.0 g of silver(I) chloride is placed in a 70.0 L...
- Q How do you solve the molarity of H2O2 after mixing? There are 2mL of H2O2, 1 mL of KI, and 2 mL of H2O?Also how would you solve for the...
- Q How does indicator works and how does one select anindicator?
- Q What is titration and why titrations are useful?
- Q 1. Explain how the pH of the solution is changing using thetitration curve.2. Describe the process in which you would titrate a weak acid witha strong base. Include an image...
- Q Balance each of the following redox reactions occurring inacidic solution.PbO2(s) +I?(aq) ?Pb2+(aq) +I2(s)SO32?(aq) +MnO4?(aq) ?SO42?(aq) +Mn2+(aq)S2O32?(aq) +Cl2(g) ?SO42?(aq) +Cl?(aq)
- Q This is a two part question. Calculate either [H3O+] or[OH−] for each of the solutions at 25 °C.Solution A: [OH−]= 2.91×10−7 M Solution A: [H3O+]=MSolution B: [H3O+]=9.81×10−9 M   Solution B:[OH−]=...
- Q What is theoretical yield
- Q A 1.912-g sample of calcium chloride is decomposed into itsconstituent elements and found to contain 0.690 g Ca and 1.222 gCl. Calculate the mass percent composition of Ca and Cl...
- Q Find the concentration of all species in solution for a 0.25 Maqueous solution ofH2CO3.        Hint (which would NOT be given for an exam): all species includesH2CO3, HCO3-,CO32-, H3O+, ANDOH-.
- Q 4. 62.4 mL of 0.39 M NaCl solution was added to 26.8 mL of 058 MPb(NO3)2 solution. a. Write the full balanced reaction, themolecular ionic equation and the net ionic...
- Q 15. What does the term quantized energy mean?How many quantum numbers are known with respect to atomicorbitals?Name them and provide their key properties
- Q What are the freezing point and boiling point of a solutionprepared by dissolving 18.6g of CaCl2 in 200.0g ofwater? (kf = -1.86�/m and kb= 0.512�/m)?
- Q For each of the following strong base solutions,determine [OH],[H3O+], pH, pOH:0.18M NaOH1.7*10^-3m Ca(OH)25.0*10^-4M Sr(OH)28.8*10^-5M KOH
- Q Find the pH of each of the following aqueous solutions.           a.        0.25 MCH3COOH           b.        0.25 MHNO3           c.         0,25 MKCH3COOd.        0.25 MKOH           e.        0.25 MNH3           f.         0.25 MNH4Cl
- Q 1) Which of the following can behave as Bronsted-Lowry bases inaqueous solution?HNO2H2SO3Ca2+I-None of the Above2) Which of the following can behave as Bronsted-Lowry bases inaqueous solution?Ba(OH)2KOHCN-NH3None of the Above
- Q 1) Calculate the ∆H value for the following unbalanced reactionusing equations 1 and 2.    C (s) + H2 O (g) → CO 2 (g) + H 2 (g)Equation 1: C (s)...
- Q Prelab 9: Due at the start of Lab 9Name:________________________Â Â Lab day________Show all work, even simple addition and include unitsand sig figs where applicable.To make solutions for the Beer's Law graph,...
- Q When the following reaction was carried out, the studentobtained 5 g of CO2. If the student started with 10 g ofCH4 and 10 g of O2, what is the %...
- Q When the following reaction was carried out, the studentobtained 5 g of CO2. If the student started with 10 g ofCH4 and 10 g of O2, what is the %...
- Q Calculate the number of milliliters of 0.469 MBa(OH)2 required to precipitate all ofthe Al3+ ions in 179mL of 0.565 M AlCl3solution as Al(OH)3. The equation forthe reaction is:2AlCl3(aq) +3Ba(OH)2(aq)Al(OH)3(s) +3BaCl2(aq)
- Q can u pls tell me how much it will cost to make 1 g ofC2H5Br by using this reaction : ethane + Br2& heat = CH3CH2BRwe have 398 grams of...
- Q For 200.0 mL of a buffer solution that is 0.2975 M in CH3CH2NH2and 0.2730 M in CH3CH2NH3Cl, calculate the initial pH and the finalpH after adding 0.0100 mol of NaOH(Kb=6.46⋅10−4).
- Q 1a) A buffer solution is composed of 1.036 g of KH2PO4 and 4.424g of na2hpo4. ( for dihydrogen phosphate ion is 6.2*10^-8.) What isthe pH of the buffer solution?b) What...
- Q is the pka of a histidine side chain always the same as that ofthe free amino acid? Why?how do titration curves differ between non ionizable andionizable r groups? why?Biochemistry
- Q Draw a molecular and particulate view of what is happening inthe steep part of a general acid-base titration curve.Please show picture!
- Q A hydrocarbon of unknown structure has the formulaC9H11N. If we hydrogenate the unknowncompound over Lindlar catalyst, only 1 equivalent of H2is absorbed. If we hydrogenate the unknown compound over a...
- Q Provide the IUPAC names of thesehydrocarbons.CH3CH=CHC(insert triplebond)CCH=CHC(insert triplebond)CH3CH=CHCH2C(insert triplebond)CCH2CH=CHCH3
- Q What is the lifetime of OH at the sea level, assuming that thefollowing reactions are the principal sinks for OH in thetroposphere. Answer in sec to two significant digits.OH +...
- Q The rate constants for the reactions of atomic chlorine and ofhydroxyl radical with ozone are given by 3 x 10-11 e-250/T and 2 x10-12 e-940/T, where T is the Kelvin...
- Q Autokinesetic events associated with a single point light sourceand optical illusions brought on by a lack of a reference horizonare common occurrences on moonless, overcast nights.Describe a documented autokinesetic incident...
- Q 145&146&147. The potential of a silver electrode ismeasured relative to an Ag-AgCl electrode for the titration of100.0 mL of 0.100 M Clï€ with 0.100 M Ag+. What is the potentialafter...
- Q ***Part1: Balance the following chemical equation using thelowest possible whole number coefficients. (Enter coefficients ofone - blanks will be marked incorrect.)( )CO2 + ( )H2O →( ) CH4 + (...
- Q If a TLC plate was done in acetone and hexane which would have ahigher rf value:1. Benzenaldehyde or 1,4-Pentadien-3-one, 1,5-diphenyl-?2.Benzenaldehyde or2,2’-(phenylmethylene)bis(5,5-dimethylcyclohexane-1,3-dione)?3. Benzenaldehyde or3,3,6,6-tetramethyl-9-phenyl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione?
- Q You carry out the titration of 35.00 mL of 0.1750 M pyridineusing a 0.275 M HCl solution. Pyridine has a pKb = 8.77What is the pH at:0 ml HCl added5.0...
- Q Parts of modern instruments and their uses The followinginstruments ( mass spectrometry , potentiometer, polarimetet)
- Q Which of the following compounds, when added to a 1.0-Msolution of HClO4, has a solubility greater than in purewater? Select all that apply.Group of answer choicesCr(ClO4)3Ca3(PO4)2PbI2ZnSAgBrBaF2
- Q can you explain and compare chain polymerization can you giveexamples of each case
- Q Question 4.Draw a simple molecular orbital diagram for the carbon monoxide(CO) molecule and explain, using an accurate bonding description,how this molecule can act as a ligand within metal carbonylcompounds.Explain why...
- Q A 77.0 mL sample of 0.0400 MHNO3 is titrated with 0.0800 MCsOH solution. Calculate the pH after the followingvolumes of base have been added.(a) 10.0mLpH =(b) 37.3mLpH =(c) 38.5mLpH =(d)...
- Q Calculate the freezing point and boiling point of each aqueoussolution, assuming complete dissociation of the solute. UseKf=1.86∘C/m and Kb=0.512∘C/m.Part ACalculate the freezing point of the solution containing 0.118 mK2S.Part BCalculate...
- Q Rank the following five salts in order of decreasing solubility,in terms of mass per unit volume.(The most soluble gets rank 1, the least soluble gets rank 5.)Hg2CO3    (Ksp =9.00×10-15; Note: The...
- Q 20.0 mL of 4.00 M HF and 40.0 mL of 2 M HCL are mixed.What is the PH of the solution if the Ka of HF is 6.8 x10^-4
- Q A 16.0 gram sample of propane gas(C3H8) is burned according to the equationC3H8(g) + 5O2(g) →3CO2(g) + 4H2O(g).In an enclosed container with a volume of 2.25L at atemperature of 322K.If...
- Q Assign NMR peaks to the following Structure. And desribe theSpectra as you would for a formal report. Please help at least givesome advice on how to start this, although full...
- Q a) Increasing the flow rate of the mobile phasewould1. increase longitudinal diffusion.2. increase broadening due to mass transfer.3. increase broadening due to multiple paths.b) How many 50 mL extractions will...
- Q A single extraction with 100 mL of CHCl3 extracts orremoves 88.5% of the weak acid, HA, from 50 mL of aqueous solution.What is the Distribution coefficient, D, for HA at...
- Q Q-2) write down the process of iodine manufacture in detail?
- Q Assign oxidation states to all atoms in each compound. (Enteryour answer using the format +1 and -2.)(a) Na2Cr2O7NaCrO(b) PCl3PCl(c) K2Ni(CN)4 (Ni only)Ni(d) C2H2O4CHO(e) HClHCl(f) Fe2O3FeO(g) NH4ClNHCl(h) N2O4NO(i) CrO3CrO(j) NaH2PO4NaHP O
- Q The calcium supplements taken by many women are composedprimarily of powdered calcium carbonate, CaCO3, which isalso the primary compoent of marble.(a) Briefly expain whyCaCO3 would be agood source for a...
- Q What are Nucleic acids? Why are they important? What are some ofthe important functions of nucleic acids? Give a list of someimportant nucleic acids.
- Q The developing chamber is not covered with plastic wrap duringthe development of the chromatogram. Will the Dion value for thecation be greater than or less than the actual value as...
- Q 1. You dissolve 5.00 g sodium hydrogen oxalate (NaHC2O4 ) insuffircient water to produce a final solution volume of 100.0 mL.Assuming all of the solid dissolves, calculate the pH of...
- Q 1. An aqueous solution is prepared such that pH = 8.2. Determinethe [H+] [OH–], and pOH of this solution. Show work.2. Below are the relative fraction of species versus pH...
- Q Two water samples were analyzed for their copper content byatomic absorption spectroscopy. After 5 replicate analyses, thefirst water sample was found to have 12.6± 0.9 mg/L copper. After 6replicate analyses,...
- Q (PH2)(PN2)/(PNH3)Be sure to answer all parts.Write the KP expression for thefollowing reaction:N2(g) + 3H2(g) ⇌2NH3(g)Use a format similar to this:KP = (PH2O)^2/(PO2)(PH2)^2KP =
- Q Consider the half-reaction below (in an acidic solution).NO3??(aq) ? NO(g)Which of the following is needed to balance this half-reaction?A) 3e?? are needed on the reactantsside.B) 4H?+ are needed on the...
- Q Provide the structure of the Diels-Alder product that would beformed if maleic anhydride were to react with napthalene:
- Q 0.1200 g of potassium dichromate primary standard is dissolved,quantitatively transferred into a 250-mL volumetric flask anddiluted to volume. 0.3000 g an unknown iron ore sample wasdissolved in hydrochloric acid, treated...
- Q Enantiomers are identical in their physical properties. Explainwhy we can still see a difference in smell and taste in 5 points ormore.
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