Chemistry question and answers for September 20, 2023
- Q What is the wavelength in meters of 91.0 kJ/mol
- Q A solution contains 0.026 M  Hg2+2 and 0.019 M Pb2+.If you add Cl−, Hg2Cl2 and PbCl2 will begin to precipitate.A) What is the concentration of Cl− required, in molarity, whenHg2Cl2 precipitation...
- Q Lactic acid, C3H6O3, occurs in sour milk as a result of themetabolism of certain bacteria. Calculate the pH of a solution of56 mg lactic acid in 250.0 mL water. Ka...
- Q Calculate the pH of the solution that results from each of thefollowing mixtures.1. 160.0 mL of 0.27 M HF with 230.0 mL of 0.32 M NaF2. 185.0 mL of 0.10...
- Q Calculate the concentration of all species(H2SO3),(HSO3),(H3O+),(SO3-2),(OH-),pH and pOH in a 1.41M Na2SO3 (sodium sulfite)solution. The ionization constant for sulfurous acid areH2SO3+H2O->HSO3-+H3O+Â Â Ka1=1.4x10-2HSO3-+H2O->SO3-2+H3O+Ka2=6.3x10-8
- Q 1. In a Diels-Alder reaction, electron-withdrawing groups in thedienophile end up preferentially inthe _________ position, and the diene must be in the____________ conformation.A) Endo; s-cis C) Exo; s-transB) Endo; s-trans...
- Q What volume of a 12.0 M KOH solution needs to be diluted toproduce 475 mL of 3.10 M KOH solution?Chemistry
- Q Why ice is less dense as a solid than as a liquid?why is this property so important for the fish and otherwildlife that live in the lakes and ponds of...
- Q Answer the following questions (a through f) based upon apeptide sequence with the following amino acids (one-letter symbolsare given): EHSGLR(a) What are the full names and three-letter abbreviations ofthe amino...
- Q Which of the following statements are correct?a) HCFCs are used as the replacement of CFCs because they do notreach the Stratosphere.b) HFCs are used as the replacement of CFCs (and...
- Q In a chemical reaction, exactly 2 mol of substance A react toproduce exactly 3 mol of substance B.2A = 3BHow many molecules of substance Bare produced when 28.2 g of...
- Q 1)Determine the pH of each solution.Part A0.20 M KCHO2Express your answer to two decimal places.Part B0.21 M CH3NH3IExpress your answer to two decimal places.Part C0.22 M KIExpress your answer to...
- Q Information regarding the question:Concentration of NaOH=0.05138 MConcentration of Crystal Violet Dye Solution=0.001 MRoom Temperature=25 degree CelciusAbsorbance from the device- spectrovis(spectrophotometer)Time: Trial 1 Trial 20 0.089 0.43030 0.106 Â Â Â 0.32360 0.121 Â Â ...
- Q ammonia is a common constituent of many natural waters andwastewaters. when water containing ammonia is treated at a watertreatment plant, the ammonia reacts with the disinfectanthypochlorous acid (HOCl) in solution...
- Q Which reaction type is each chemical reaction, Precipitation,Acid-base, or Oxidation-reduction(redox)1.CuSO4(aq)+Ba(ClO4)2(aq)-->BaSO4(s)+Cu(ClO4)2(aq)2.4Mn2++5BiO-3(aq)+2OH-(aq)-->H2O(I)+4MnO-4(aq)+5Bi+(aq)3.NH4OH(aq)+HCl(aq)-->H2O(l)+NH4Cl(aq)4.H2C2O4+2NaOH(aq)-->H2O(l)+Na2C2O4(aq)5.MgCl2(aq)+Pb(NO3)2(aq)-->PbCl2(s)+Mg(NO3)26.4Zn(s)+NO-3(aq)+7H2O(l)-->4Zn2+(aq)+NH+4(aq)+10OH-(aq)7.Hg2(OOCCH3)2(aq)+SrI2(aq)-->Hg2I2(s)+Sr(OOCCH3)2(aq)8.2HCl(aq)+K2S(aq)-->H2S(g)2KCl(aq)9.2H3PO4(aq)+3Ca(OH)2(aq)-->3H2O(l)+Ca3(PO4)2(aq)10.4Fe(s)+3O2(g)-->2Fe2O3(s)
- Q CO (g)CO2 (g)H2O (g)H2O (l)â€137.1â€394.01â€228.4â€274.4Given the above standard free energies of formation at 25oC inkJ/mole,(a) Find ΔGo and the equilibrium constant Kp for the reaction CO(g) + H2O (g)CO2 (g)...
- Q Kp = 6.5 × 104 at 308 K for thefollowing reaction:2 NO (g) + Cl2(g) ⇌ 2NOCl(g)At equilibrium,  PNO = 0.35 atm andPCl2 = 0.10 atmWhat is the equilibrium partial pressure...
- Q If the solution was not continuously stirred while performingthe freezing point determination, what effect might that have onthe experimental results? Briefly explain.
- Q Given the following equilibrium system:2SO2(g) + O2(g) ↔ 2SO3(g) +99.1 kJIf additional SO2(g) is added to the system while thetemperature and pressure are kept constant. Compared to itsoriginal concentration, how...
- Q 1. In the Deacon process for the manufacture of chlorine, HCland O2 react to form Cl2 andH2O. Sufficient air (21 mole% O2, 79% N2) is fed to provide 35%excess oxygen,...
- Q 4. Cr has four isotopes:Cr 50Cr 52Cr 53Cr 54A) Determine how many protons, neutrons and electrons eachisotope has.B) The atomic mass reported for Cr is 54.94. What does this tellus...
- Q The formation of tetrafluoroethylene from its elements is highlyexothermic:2F2(g) + 2C(s) ↔ F2C=CF2(g)(a) If a mixture of F2, graphite, and C2F4 is at equilibrium ina closed container, will the reaction...
- Q what is the maximum mass (in grams) of each of the followingsoluble salts that can be added to 160 mL of 0.050 MBaCl2 without causing precipitate to form? (assume theaddition...
- Q Determine the pH during the titration of 33.6 mL of 0.295 Mmethylamine (CH3NH2, Kb = 4.2×10-4) by 0.295 M HClO4 at thefollowing points. (Assume the titration is done at 25...
- Q Explain how polarity P' is related to retention of the sampleanalytes on the silica column for both the normal-phase andreverse-phase procedures.
- Q Identify the Bronsted acid and base in each of the followingequations: Please show all work on how you got the answer so I canunderstand.HNO3 + H2O
- Q Consider the reaction A -> 2 B. Initially 1.50mol A ispresent and no B. What are the amounts of A and B when the extentof reaction is 0.60mol?
- Q Benzene [C6H6] and toluene [C7H8]  form a solutionthat is nearly ideal. At 30 ℃ the vapor pressure of an excess ofpure benzene is 120.2 mmHg and that of toluene is 36.7...
- Q Identify the number of core and valence electrons for each atom.Xe : core electrons Xe : valence electrons Be : core electrons Be :valence electrons Br : core electrons Br...
- Q If a 0.100 M solution of NaOH is added to a solution containing0.200 M Ni2+, 0.200 M Ce3+, and 0.200 MCu2+, which metal hydroxides will precipitate first andlast, respectively? Ksp...
- Q Iron (III) oxide reacts with carbon monoxide to produce iron andcarbon dioxide:Fe2O3 (s) + 3CO(g) ïƒ 2Fe (s) + 3 CO2 (g)54.4 g of Fe2O3and 24.7 g of CO react...
- Q Enzyme UsedLysozymeThermal DenaturationTemp (Celsius)Abs (325 nm)400.106500.086600.109650.161700.409752.06802.173900.821Urea DenaturationMof ureaAbs (325 nm)00.46410.0720.05640.0560.03580.028Please help me Calculate fraction denatured and equilibriumconstant at each temperature and plot ln K vs T-1 graph, onceplotted Find ΔH,...
- Q During a titration, it took 35.8mL of 0.10 M Be(OH)2to neutralize 65mL of HCl.Write the balanced chemical reaction.How many moles of beryllium hydroxide are needed to neutralize2 moles of HCl?What...
- Q An engineer is designing a product in which a copper wire willcarry large amounts of electricity. The resistive heating of a 66 gcopper wire is expected to add 550 J...
- Q Choose an organic compound to describe in depth; do not choose anonmetal already selectedby another student. Include information on whether it is foundin nature, how it canbe synthesized, its physical...
- Q Aqueous potassium phosphate is added to 545 mL of a solutioncontaining calcium chloride to precipitate all of the Ca2+ ions asthe insoluble phosphate (310.2 g/mol). If 4.51 g calcium phosphateis...
- Q Put the elements 14 N, 16 O, and 40Ar in order of increasingnuclear stability and justify your answer mathematically.please show all work, units, and equations!
- Q Two 20.0 g ice cubes at −12.0 ∘C are placed into 255 gof waterat 25.0 ∘C. Assuming no energy is transferred to or from thesurroundings, calculate the final temperature, Tf,...
- Q At a certain temperature, 0.860 mol of SO3 is placed in a 1.50-Lcontainer. At equilibrium, 0.100 mol of O2 is present. CalculateKc.
- Q Forethanol/water (70;30) determine;A) the bubble point temperature if p=10 barB) the bubble point temperature if p=100 bar
- Q The data in the table below were obtained for the reaction:2ClO2(aq) + 2OH-(aq) ---> ClO3-(aq) + ClO2-(aq) + H2O(l)Experiment number [ClO2](M) [OH-](M) Initial Rate (M/s)1 .020 .030 .002762 .060 .030...
- Q What is the coordination number for each of the followingcomplexes or compounds?[Co(NH3)4(H2O)2]3+[Co(NH3)4(H2O)2]3+[Mg(EDTA)]2−[Mg(EDTA)]2−[Cu(NH3)4]2+[Cu(NH3)4]2+[Ag(NH3)2]NO3[Ag(NH3)2]NO3Enter the coordination numbers, in the order that the complexesare listed, as four integers separated by commas (e.g.,1,2,3,4).View Available...
- Q In glucose, which carbon is the anomeric carbon?
- Q Indicate whether each of the following compounds will gave anacidic, basic or neutral solution when dissolved in water.Clear Allammonium bromidebarium cyanidepotassium chloridepotassium bromideThe pH will be less than 7.The pH...
- Q Consider this gas phase equilibrium system:PCl5(g) equilibrium arrow PCl3(g) + Cl2deltaH = +87.8 kJ/molWhich of these statements are false?A) increasing the temperature causes the equilibrium constantto increaseB) increasing the system...
- Q Question 5aOxygen gas dissolves in lake water. (This is how fish get theoxygen they need to survive.) What happens to the solubility ofoxygen gas when it is cold outside? Why...
- Q what is the mechanism through which water activity preventsmicrobial proliferation?
- Q A 0.100 g sample of an organic compound of an organic acidcontains C, H, and O was combusted to determine the empiricalformula. The combustion produced 0.2921 grams of CO2 and...
- Q PLEASE ANSWER ALL 4 THANK YOU VERY MUCH!!!!1. How was the Periodic Table originally organized? Explain thecurrent organization of the Periodic Table and why it is a moreaccurate layout of...
- Q While OLEDS are useful, sometimes they can be hard to convert toregular devices.1)Are OLED's more or less robust than inorganic LEDS andwhy?2) If a defect, for example a disruption in...
- Q A gas with 65% hydrogen exits a reactor at 2310 psia and 700°F.Select an appropriate material for the piping at the exit of thereactor. (Hint: Find a good version of...
- Q If a solution containing 17.91 g17.91 g of mercury(II)perchlorate is allowed to react completely with a solutioncontaining 5.102 g5.102 g of sodium dichromate, how many grams ofsolid precipitate will be...
- Q One can argue that both nitric oxide and sulfur dioxide arenatural, and hence, harmless. Would you agree or disagree with thisstatement? Explain using the concept of equilibrium andbiogeochemical cycles, and...
- Q Explain the strengthening mechanism in the large particle anddispersion strengthen composites with their differences.
- Q Describe how you would design the experiment, what you wouldmeasure, and how you could determine the specific heat capacity ofwater.
- Q For a solution of Ni2+ and ethylenediamine, the followingequilibrium constants apply at 20° C: Ni2+ + H2NCH2CH2NH2 <->Ni(en)2+ log K1 = 7.52 Ni(en)2+ + en <-> Ni(en)22+ log K2 =6.32...
- Q carbonyl fluoride, COF2, is an important intermediate used inhe production of fluorine of fluorine-containing compounds. Forinstance, it is used to make the refrigerant carbon tetrafluoride,CF4 via the reaction2COF2 = CO2...
- Q a. Compare the interactions of protons/alpha particles toelectrons with absorber materials? What properties are factors inslowing down and ultimately stopping these particles?b. Do you expect neutrons to slow down as...
- Q Define Le Chatelier’s Principle in your own words:If concentration of a reactant is increased, explain which way(and why) the equilibrium will shiftIf product is removed from a reaction at equilibrium,...
- Q How many lysine residues become aldehydes in the Schiff basecrosslink?How many hydrogen atoms are on a proline nitrogen atom at pH = 7when the proline nitrogen forms a pepetde bond...
- Q High levels of which compound will inhibit the operation of thecitric acid style? a) ATP b)ADP c)NADH d) more than one correctchoice
- Q Calculate the pH of a polyprotic acid give and sketch thetitration curve for the following reaction: A 10.0-mL aliquot of0.100M Na3AsO4 titrated with 0.100M HCl. pK1 = 2.25, pK2 =...
- Q The differential for the Internal energy, U, at constantcomposition is?U = −P?V + T?S(a) What are the natural independent variables of U? [2](b) Derive an expression for the change in...
- Q Saccharin, an artificial sweetener that is 300 times sweeterthan sugar, is composed of 45.9% carbon, 2.73% hydrogen, 26.23%oxygen, 7.65% nitrogen, and 17.49% sulfur. Each packet of Sweet
- Q The reaction SO2Cl21g2 ¡ SO21g2 Cl21g2 is firstorderin SO2Cl2. Using the following kinetic data, determine themagnitude and units of the first-order rate constant:Time Pressure0 1.0002500 0.9475000 0.8957500 0.84810000 0.803k=
- Q In the laboratory a student combines 49.7 mL ofa 0.133 M magnesium iodidesolution with 28.0 mL of a 0.562M nickel(II) iodide solution.  What is the final concentration of iodide anion?___ M
- Q Calculate the enthalpy change for the reaction below given thestandard heat of combustion for ammonia, NH3, is -226 kJ/mol. 4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(g)
- Q Write in brief about the side effects of using (Benzoic Acid) aspreservative.....?Which additive does convert (Sodium Benzoate) to (Benzene) in humanbody?Explain briefly, Why (Benzoic Acid) cannot be dissolved inwater?
- Q Predict the bond order in the following: Ca2
- Q 1.what is 'polarization'?2.explain the diffrence between 'orientation polarization' and'distortion polarization'.
- Q In need of a numbered, styrofoam cup calorimetry laboratoryprocedure. This experiment will utilize redox chemical process.Basic materials include:Styrofoam cupsDigital thermometersCardboard3M HCL, H2SO4, C2H4O2, NAOH, NH4ClMg, Al, Zn, Fe, Cu
- Q A .435 g sample of a nonvolatile, nonionizable solute with amolar mass of 67.4 g/mol is dissolved in 15.1 g of cyclohexane.Calculate the molar concentration of solute in the solution.Calculate...
- Q RESONANCE STRUCTURES how do you know which elements has positvecharge or negative
- Q Identify the charge on the transition metal center and thenumber of valence d electrons it has.1.[Cu(en)2(H2O)2]I22.[Co(NH3)5(NO2)]Cl23. [Co(en)2Cl2]Cl-4. Mo(bipy)(pph3)(CO)3
- Q There is a large difference between Ionization potentials ofOxygen and Nitrogen, whereas the Ionization potentials ofPhosphorous and Sulfur are very Close - Explain.
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