Chemistry question and answers for September 01, 2023
- Q •The persistent presence of O2 in the atmosphere is intimatelyconnected with the removal of CO2 from the atm as part of theinorganic C cycle.•What is the chemistry behind it?•How is...
- Q Briefly discuss any source of errors in the HPLC Lab ''LiquidChromatographic Analysis of Analgesic Powders''
- Q What volume of CO2(g)will be formed when 2.0 gCaCO3(s) is heated and the gas iscollected at 700 mm pressure and 20oC? The reaction is:CaCO3(s) → CaO(s) +CO2(g)A. 0.44L                    B. 0.52L                    C. 52L                                   D....
- Q calculate the wavelengths of the following: A) a muon (asubatomic particle with a mass of 1.884x10^-25g) traveling at2.30x10^2 m/s B) an electron (m=9.10939x10^-28g) moving at3.80x10^6 m/s in an electron microscope
- Q A. 100ml of 0.5M acetic avid is titration with 20ml of 0.5M KOH.What is the pH of the acid before titration? (ka acetic acid is 1.8x 10^-5)B. What is the...
- Q Explain how solubility tests could be used to differentiatebetween:a. a phenol and a carboxylic acid.b. a phenol that contains electron-withdrawing groups and aphenol that contains electron-donating groups.c. a carboxylic acid...
- Q Light from three different lasers(A, B, and C), each with a different wavelength, was shined on thesame metal surface. Laser A produced no photoelectrons. Lasers Band C both produced photoelectrons,...
- Q what are the different factors thar alter the rates of chemcialreactions?
- Q What is a possible procedure I can use to determine the directsolubility of KHT following these guidelines?1. Based on the principle of making a saturated solution, KHT isadded until excess...
- Q The line spectrum of helium has many more lines in it than theline spectrum of hydrogen. Draw orbital energy diagrams for both Hand He, showing all orbitals up through n...
- Q Using electron configurations, shielding, and effective nuclearcharge, explain why Mg has a higher ionization energy than Na andAl.
- Q How many grams of each of the following per 1000g of water inyour car radiator are needed to give equal protection againstfreezing down to -10.0°C? (a) Methyl alcohol (CH3OH) b.pis...
- Q The half-equivalence point and the equivalence pointshould not be noted when measuring pH changes during atitration. True or False ?
- Q 1.) Acetic acid is a weak monoprotic acid with Ka=1.8*10^-5. Inan acid base titration, 100 mL of 0.100M acetic acid is titratedwith 0.100M NaOH. What is the pH of the...
- Q Which one of the following will act as a buffer solution?A.25 ml of 0.1 M NH4Cl solution mixed with 12.5 mL of0.1 M NaCl solutionB.25 mL of 0.1 M NH4Cl...
- Q 14a. Potassium hydrogen phthalate is a solid,monoprotic acid frequently used in the laboratory to standardizestrong base solutions. It has the unwieldy formula ofKHC8H4O4. This isoften written in shorthand notation as...
- Q The Winkler method for dissolved oxygen in water is based on therapid oxidation of solid Mn(OH)2 to Mn(OH)3in alkaline medium. When acidified, the Mn (III) readily releasesiodine from iodide. A...
- Q A) Calculate the mass defect of the helium nucleus 52He. Themass of neutral 52He is given by MHe=5.012225amu. Answerin amuB) Calculate the binding energy E of the helium nucleus52He (1eV=1.602×10−19J)....
- Q A sheet of gold weighing 12.0 g and at a temperature of 20.0°Cis placed flat on a sheet of iron weighing 21.5 g and at atemperature of 59.4°C. What is...
- Q what is the molar concentration of 2-methylbutanol in its neatsolution?
- Q Although the formula of this new chemical is a trade secret, itcan be revealed that the formula for Herbigon is X-acetate(XCH3COO, where \"X\" represents the top-secret cation of the salt).It...
- Q Hydrazine, N 2 H 4 , reacts with oxygen to form nitrogen gas andwater. N 2 H 4 ( aq ) + O 2 ( g ) ⟶ N 2...
- Q 1) Determine the volume (liters) of 0.500 M NaOH solutionrequired to neutralize 1.75 L of 0.250 M H2SO4. The neutralizationreaction is: H2SO4 (aq) + 2NaOH (aq) → Na2SO4 (aq) +...
- Q A 1.20-L contains 1.10 g of an unknown gas at STP .what is the molecular weight of the unknown gas?
- Q What important physical chemical property of drug polymorphstrictures dictates whether a particular polymorph will be viableas a marketed therapuetic agent? There are multiple such propertiesbut think about the example given...
- Q 1)Vinyl Chloride , C2H3Cl is used to make polyvinyl-chloride (PVC), aplastic from which many useful itmes are made. If you have 12.8pounds of vinyl chloride, how many moleculesof the compound...
- Q An organic liquid is a mixture of methyl alcohol (CH3OH) andethyl alcohol (C2H5OH). A 0.220-g sample of the liquid is burned inan excess of O2(g) and yields 0.376 g CO2(g)...
- Q Which of the following will increase the amount of productpresent at equilibrium for the reaction: 2A(g) B(g) AH 84 and K 1.3x 103. (Chhose all correct answers) A) decrease the...
- Q Explain how Clâ» can be determined by cathodic strippingvoltammetry at a silver-working electrode.
- Q 6.Open the PhET States of Matter Simulation to answer thefollowing questions:(a) Select the Solid, Liquid, Gas tab. Explore by selectingdifferent substances, heating and cooling the systems, and changingthe state. What...
- Q You may have heard that ice skaters actually skate on a thinlayer of water rather than solid ice (which reduces friction on theblade and allows them to skate faster). Let’s...
- Q Indicate whether or not each of the following ionic compoundswill undergo hydrolysis and predict whether the resulting solutionpH will be acidic, basic, or indeterminate (both ions undergohydrolysis).(a) NH4ClO4acidic hydrolysisbasic hydrolysisindeterminate...
- Q A beaker with 115 mL of an acetic acid buffer with a pH of 5.000is sitting on a bench top. The total molarity of acid and conjugatebase in this buffer...
- Q A) What is the rate constant for the reaction with an averagetime of 48.6 seconds, between 3.00 ml of 0.1 M t-butyl chloride, 3ml 0.01 M NaOH, 4 ml water...
- Q For each of the following five reactions,circle the specific chemical species that is:reduced, and draw a box around thespecific chemical species that is oxidized:a) MnO2 (s) + 2 I- (aq)...
- Q Chelating agents are important for many biological processes.List and describe three such processes.
- Q Suppose you start with a solution of red dye #40 that is 4.0 ✕ 10−5M. If you do three successive volumetric dilutions pipetting 5.00mL of solution and diluting with water...
- Q Consider the titration of a 28.0-mL sample of 0.180 M CH3NH2with 0.145 M HBr. (The value of Kb for CH3NH2 is4.4×10−4.)Determine the pH after adding 6.0 mL of acid beyond...
- Q a. explain in structure and words the observation that soap doesnot work properly in very low PH water or hard water which hascalcium and magnesium ions.b. would a soap made...
- Q A generic solid, X, has a molar mass of 80.4 g/mol. In aconstant-pressure calorimeter, 16.0 g of X is dissolved in 337 g ofwater at 23.00 °C.The temperature of the...
- Q Name the kinds of attractive forces that must be overcome inorder to perform the following tasks. Select all thatapply.1) Dissolve CsI in liquid HF:Dipole-dipole interactionsIonic BondingIon-dipole interactionsDispersion ForcesHydrogen Bonding2) Melt...
- Q Chemistry Charles's Law Post-Laboratory Questions1. Serveral students performed this experiment without payingadequate attention to the details of the procedure. Briefly explainwhat effect each of the following procedural changes would have...
- Q Describe the preparation of 3.00 L of 0.150 M glycine buffer, pH8.1, from glycine and 1.00 M NaOH. What mass of glycine isrequired? The appropriate pKapKa of glycine is 9.6....
- Q Explain what Vmax and Km describe
- Q Calculate the pH of a solution made by mixing 100.0 mL of 0.044M NH_3 with 100.0 mL of 0.126 M HCl. (Kb for NH_3 = 1.8 x10^-5)
- Q 1.Write the equilibrium expression for the dissociation of KHT(s) in water. B. Develop an ICE chart for the dissociation of KHTin water.
- Q Calculate the concentration of free mercury (II) ion,[Hg2+], in an aqueous solution that is initially 0.16 MHg(NO3)2 and 3.2 M NaCl given that theKf of HgCl42- is1.7*1016.The answer is 2.2*10-19...
- Q For a particular process q = 20 kJ and w = 15 kJ. Which of thefollowing statements is true?A. The system does work on the surroundings.B. Heat flows from the...
- Q Which is (are) the spectator ion(s) in the followingprecipitation reaction (equation not balanced)? (NH4)3PO4(aq) +Al2(SO4)3(aq) --> AlPO4(s) + (NH4)2SO4(aq)
- Q Explain why using deionized water to rinse the walls of theflask have no effect on the reported results of titrationsperformed.
- Q Show calculations and briefly describe how you will makethe following solutions:50.00 mL of 0.200 M Fe(NO3)3(aq) solution from iron(III)nitrate nonahydrate200.00 mL of a 2.00 mM KSCN(aq) solution from potassiumthiocyanate.100.00 mL...
- Q At a certain temperature and total pressure of 1.2 atm, thepartial pressures of an equilibrium mixture for 2A(g) <==>B(g) are Pa = 0.60 atm and Pb = 0.60 atm. After...
- Q What is the ratio[CH3COOH]/[CH3COO-] in a solutionmade by mixing 100 mL of 0.500 M CH3COONa with 50.0 mLof 0.0500 M NaOH? (CH3COOH Ka = 1.8 x10-5)A.) 4.1 x 10-5B) 2.2...
- Q A) Calculate E° for the reaction:2 MnO4- + 10 Cl- + 16H3O+ →2 Mn2+ + 5 Cl2 +24 H2OE°MnO4-/Mn2+,H3O+ = +1.507,E°Cl2/Cl- = +1.358Round your answer to 3 significant figures.-------------------------------------------------------------------------------------B) Use...
- Q Consider the titration of a 23.4 −mL sample of 0.125 M RbOH with0.105 M HCl. Determine each quantity:the pH after adding 4.1 mL of acid beyond the equivalencepointExpress your answer...
- Q 1. A certain proton NMR spectrum (recorded on a 400 MHz NMRspectrometer) consists of one singlet and one doublet. The singlethas a chemical shift of 5.0 ppm. The doublet is...
- Q outline two synthesus routes to make the tripeptide M-A-N.Biochemistry question
- Q Question #48. In a titration experiment, 50 mL of 0.1 M aceticacid (Ka = 1.75 x 10-5) was titrated with a 0.1 M NaOH (formalconcentration) at 25 ºC. The pH...
- Q suppose you dissolved 2000 U of enzyme in 1 ml ofbuffer. you take a 20 microlitre of diluted enzyme and add it to 1ml of substrate solution with a concentration...
- Q In a constant‑pressure calorimeter, 60.0 mL of 0.920 M H 2 SO 4was added to 60.0 mL of 0.360 M NaOH . The reaction caused thetemperature of the solution to...
- Q A 2.250×10−2 M solution of glycerol (C3H8O3) in wateris at 20.0∘C. The sample was created by dissolving a sample ofC3H8O3 in water and then bringing the volume up to 1.000...
- Q 1. Explain how an emulsifier can combine a nonpolarsubstance with a polar substance.2. Mayonnaise is a thick mixture containing oil, vinegar(water-based), and a phospholipid molecule called lecithin found inthe yolks...
- Q Complete the stoichiometry table using the starting valuesprovided.reagentmolecularweightmass (g)mmolesequivalentsdensity (g/mLvol.(mL)bromobenzene0.4052.248magnesium1.397xxxxxxxxxxxxxxbenzophenone1xxxxxxxxxxxxxxdiethyl ether22.724theoretical producttriphenylmethanolmolecularweightmass (g)mmolesxxxxxxxxxxxxxxxxmelting point of triphenylmethanol...................... in degree celsiusSelect the name of the catalyst used for this reaction, if therewas...
- Q Sulfuryl chloride, SO2CL2, is a compound with very irritatingvapors; it is used as a reagent in the synthesis of organiccompounds. When heated to a sufficiently high temperature, itdecomposes to So2...
- Q Calculate the pH of a buffer that is 0.10 M in KH2PO4 and 0.050M in Na2HPO4. What is the pH after adding 5.0 mL of 0.20 M HCl to0.10 L...
- Q 2. Which of the following gases could have the same pressure andtemperature? All of the containers are rigid and have the samevolume.A.Ne and N2B.O3 and H2OC.N2 and O3D. Ne, N2,...
- Q 14) you are titrating 10.0mL of a solution of 0.25M acetic acid(Ka=1.8 x 10 ^-5). you are using a solution of 0.10M KOH tocomplete the titration curve. create the graph...
- Q What does the titration curve for 5ml pH 5.6 acetate bufferbeing titrated with 1.5M NaOH look like?What is the buffer capacity?What volume is needed to change pH from initial pH...
- Q If the gas-solid equilibrium amounts to a monolayer capacity of150cc(STP)/g of N2 (16.2e -20 m^2/ molecule), the surface area of1g of the solid adsorbent exceeds 850 m^2. True or False?
- Q About soap synthesis. Liquid plant contain mostly unsaturated fattyacids chains while semisolid animal fats contains mostly saturatedfatty acid chains. Explain how this relates to any differences thatobseved in appereance or...
- Q Amixture contains 1.37x10^23 molecules PCl3 and 0.385 mol PCl5- howmany grams of chlorine and how many moles of phosphorous arethere?
- Q 10) You want to create a buffer using phosphoric acid and SodiumDihydrogen Phosphate. what is the best pH at which to make thebuffer? using that pH and a concentration of...
- Q Calculate the solubility of LaF3 (Ksp = 2 x 10-19) in gramsper liter in: a) pure water b) 0.010 M KF solution
- Q Assuming complete dissociation, what is the pH of a 4.21 mg/LBa(OH)2 solution?pH=
- Q Often you may have seen results of an experiment, such as bloodanalysis, reported as “countsâ€. (a) What type of results may berepresented by counts? Hint: there’s more than one type.
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