Chemistry question and answers for July 06, 2023
- 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 initialpartial pressure of B in each...
- Q Determine the pH of each of the following solutions. 7.00×10−2 MHNO3, 0.160 M HNO2, 2.10×10−2 M KOH, 0.245 M CH3NH3I, 0.318 MKC6H5O.I am not getting the correst answer to these.......
- Q In a factory in which metal parts are degreased with organicsolvents, the intern breaks a bottle containing a mixture of 5liters of tetrachloroethylene (PER, MW = 166 g/mol, Ï =...
- Q please answer the following questions1- Assuming the partial pressure of oxygen gas is that ofatmospheric oxygen 0.021 atm, rather than the 1.00 atm assumed inthe derivation of Equation down, derive...
- Q When 14.3 g of an organic compound known to be 55.81% C, 7.02%H, and 37.17% O by mass is dissolved in 883.2 g of cyclohexane, thefreezing point is 3.98 °C....
- Q Assume an atom has K, L, and M electrons and the energies for K,L, and M shells are -5000, -500, and -50 eV. Please give allpossible energies of Auger electrons...
- Q In a particular redox reaction, MnO2 is oxidized to MnO4– andFe3 is reduced to Fe2 . Complete and balance the equation for thisreaction in acidic solution. Phases are optional.
- Q A 5.50 −g sample of a weak acid with Ka=1.3×10−4 wascombined with 4.90 mL of 6.20 M NaOH and the resulting solution wasdiluted to 750 mL. The measured pH of...
- Q As with amino acids and peptides, various classes ofsaponifiable lipids can often be separated by electrophoresis.a. Could a mixture of phosphatidylcholine and phosphatidylserinebe separated by electrophoresis at pH 7? Explain.b....
- Q ethanol(C2H5OH)and gasoline(assumed to be octane,C8H18) are bothused as automobile fuel.if gasoline is selling for $4.50/gal,whatwould the price of ethanol have to be in order to provide the sameamount of heat...
- Q Enter your answer in theprovided box.How many grams of solid barium sulfate form when 45.0 mL of 0.160M barium chloride reacts with 69.0 mL of 0.065 Msodium sulfate? Aqueous sodium...
- Q Standardized NaOH solutions are typically restandardized if leftunused for more than a week or two. The main concern is exposure tothe atmosphere (thus it is important to seal the bottle...
- Q Discuss the relationship between the location of an atom in theperiodic table and its electron configuration.
- Q You plan on isolating a protein of interest by cutting a bandout of a gel. Your protein is a phosphatase (a certain type ofenzyme) and you hope to measure its...
- Q If 0.291 g of Mg is reacted with excess HCl and 301 mL of H2 gasis collected in a gas collection tube over water at 25oC and 1 atmof pressure....
- Q Determine the freezing point of a solution that contains 78.8 gof naphthalene (C10H8, molar mass = 128.16 g/mol) dissolved in 722mL of benzene (d = 0.877 g/mL). Pure benzene has...
- Q Find the pH and [SO42-] of a 0.0050 M sulfuric acid solution
- Q Calculating equilibrium concentrations when the net reactionproceeds forwardConsider mixture B, which will cause the net reaction to proceedforward.Concentration(M)initial:change:equilibrium:[XY]0.500−x0.500−xnet→⇌[X]0.100+x0.100+x+[Y]0.100+x0.100+xThe change in concentration, x, is negative for thereactants because they are consumed...
- Q Ligand X forms a complex with both cobalt and copper, each ofwhich has a maximum absorbance at 510 nm and 645 nm, respectively.A 0.263-g sample containing cobalt and copper was...
- Q In a hydrogen atom, how might an electron move from one energylevel to another?
- Q List and describe the significance of the quantum numbers neededto specify the internal state of hydrogen-like atoms.
- Q Describe the challenge that rooftop solar energy presents toelectric grid operators in California.
- Q A mixture initially contains A, B, and C in the followingconcentrations: [A] = 0.300 M , [B] = 1.30 M , and [C] = 0.400 M .The following reaction occurs...
- Q The Kb for an amine is 2.105 × 10-5. What percentage of theamine is protonated if the pH of a solution of the amine is 9.788?(Assume that all OH– came...
- Q a. If a Bragg angle of 41.31o 2-theta is observed fora first order peak from a {110} plane in a pure BCC element usingCu K-alpha radiation (1.54 A wavelength), what...
- Q Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is animportant compound in industry and agriculture.Calculate the pH for each of the following points in thetitration of 50.0 mL of a...
- Q Explain why atomic emission spectroscopy can be used formulti-elemental analysis, but atomic absorption is used mostly forquantification of single element.
- Q Part A) 525mL of 1.50M NaCl is added to abeaker containing 378mL of 2.22M AgNO3, resulting in the formationof AgCl precipitate. What is the limiting reactant?NaClAgNO3AgClNaNO3Part B) How manygrams of...
- Q Calculate the volume of 0.20 MNaOH required to bring the pH of 20 mL of 5% acetic acid to 4.74,the pKa of acetic acid.Please and thank you in advance :)
- Q Consider a tank initially containing 3L of 1M HCl. To this tank,we add 3L of 2M Ca(OH)2, and allow the acid-basereaction to proceed to completion.(a) At the end of this...
- Q What are the differences between MRI spectra of bodytissue against that of an organic compounds ?
- Q Assuming that you are limited to the standard glassware andequipment available in the Chemistry lab room, write a procedure todetermine the density of an oil.
- Q Assign the molecules CCl2CCl2,CCl2CF2, SeO3, PCl3,C2O42-, CH3Cl,CH3CH2Cl,SO to point groups withexplantion.
- Q Consider the reaction of nitrous acid in water where Ka =4.0 ✕ 10−4. HNO2(aq) + H2O(l) equilibrium reaction arrow NO2−(aq) +H3O+(aq) (a) Which two bases are competing for the proton? (Selectall that...
- Q 1.Calculate the solubility (in grams per 1.00×102mL of solution) ofmagnesium hydroxide in a solution buffered at pH = 12.S1=_____2.Calculate the solubility (in grams per 1.00×102mL ofsolution) of magnesium hydroxide in...
- Q A substitutional solid solution is formed between silver andgold. Calculate the weight percent of gold that should be added tosilver to obtain an alloy with 5.5 x 1021 gold atoms...
- Q A chemist at a pharmaceutical company is measuring equilibriumconstants for reactions in which drug candidate molecules bind to aprotein involved in cancer. The drug molecules bind the protein ina 1:1...
- Q A solution containing a mixture of the compounds X and Y had anabsorbance of 1.00 at 443 nm and an absorbance of 0.861 at 520 nmwhen measured with a 1.00...
- Q Discuss proper operation and maintenance of glass pHelectrodes.
- Q What were some error's in Millikan's oil drop experiment andwhat were their sources. This deals with his finding charge ofelectron experiment .
- Q Determine the pH of each of the following solutions., 3.6×10−2 MHI,9.23×10−2 M HClO4, a solution that is 4.0×10−2 M in HClO4 and4.8×10−2 M in HCl, a solution that is 1.01%...
- Q 6. Sometimes it's hard to tell which thing is the solvent andwhich the solute – for example you can make mixtures of water andmethanol at any proportion. Fortunately, Raoult's law...
- Q (a) Do you expect the surface energy to be greater than, thesame as, or less than the grain boundary energy, why? (b) A smallangle grain boundary has a less grain...
- Q Which of the following actions will cause the equilibrium toshift such that the partial pressure of NO gas will increase?2NO(g) + O2(g) ⇌ 2NO2(g)  ΔH = −13.1 kJIncrease the pO2(g)Increase the...
- Q Consider the titration of 10.00 mL of 0.10 M acetic acid(CH3COOH) with 0.10 M NaOHa. What salt is formed during this reaction?b. do you expect the salt solution at the...
- Q Use the data below from an electron impact mass spectrum of apure compound to deduce its structure. Draw your structure in thedrawing window.1.m/zRelative intensity460.54519442030100283227142.m/zRelative intensity731.072255784310029173.m/zRelative intensity523150100152Thanks
- Q Write the balance molecular and net ionic equations for thefollowing meathesis reactions, if they occus.a. barium nitrate + sodium carbonateb. lead(II) nitrate + sodium carbonatec. zinc acetate + sodium carbonated....
- Q What is a completeness of preciptation and why is itimportant?
- Q A 12.0 L solution contains 4.15 M Ba(NO3)2. Adding a sufficientamount of Na3PO4 to the solution will precipitate Ba3PO4. Will aprecipitate form if 15.00 mg Na3PO4 is added to a...
- Q Write balanced molecular and net ionic equations for thereaction of (identify phases):1. sulfuric acid with iron (assume iron(II) compoundformation)2. hydrobromic acid with magnesium3. acetic acid,HC2H3O2, withzincI don't understand how to...
- Q 1. Whereas the excitation scan showed two features (bands, orpeaks), the emission scan only showed one band. Why is this?
- Q Part A) Determine the [OH−] of a solution that is 0.150 M inCO32−. Express your answer using two significant figures.Part B) Determine the pH of a solution that is 0.150...
- Q Explain thesimilarity between a hydrogen bond and a covalent bond. Explain asimilarity between a hydrogen bond and an electrostaticinteraction. Explain a difference between an electrostaticinteraction and a hydrogen bond.
- Q 1. From the Kb values for arsenate in the following equations,calculate the three Ka values of arsenic acid. (Assume that Kw is1.01???10?14.)a) Kb1 = 3.19???10?3b) Kb3 = 1.76???10?122. A solution...
- Q You are the lead engineer at a bioremediation field site that iscontaminated with 330 mg/L PCE, which has a molecular formula ofC2Cl4. The other available electron acceptors are: oxygen at...
- Q A student reacts 37g of salicylic acid with 60 mL of aceticanhydride producing 26.7g of acetyl salicylic acid. What is thepercent yield of the reaction
- Q howto increase a binding between a ligand ( etravirine) and a protein( Human immunodeficiency virus type 1 HIV-1). disscusion should bebased on thermodynamic theory
- Q Which compound will have the larger Rf value on a SiO2 TLC plateusing 10% ethyl acetate/hexane as eluent: 3-decanone or 3-decanol,toluene or benzoic acid, cyclooctane or cyclooctanone? Why?
- Q What role does thetrans-1,2,-diaminocyclohexane-N,N,N’,N’-tetraacetic acid play in anexperiment testing Fluorine ion concentration in local tap water?Does the composition of the TISAB play a role?
- Q 1. What are the advantages and disadvantages to the method ofinternal standards?2. If someone made a mistake while preparing the unknown byadding too much solvent and going over the mark...
- Q Q4. A beta emission has a wavelength of 1,280 nm, what energylevel (n) did the electron fall from?Q5. The gamma Lyman emission of hydrogen corresponds to anelectron dropping from which...
- Q Propose a detailed, step-by-step procedure for making 100-mLbuffer solutions from the following: 0.100 M NaCH3CO2 and 0.100 MHCH3CO2 0.100 M HCH3CO2 and 0.100 M NaOH
- Q A.Neglecting activity coefficients, calculate the pH of anaqueous solution of 5.0 x 10-7 M KOH.B. What fraction of the total [H+ ] is derived from theautoionization of water?
- Q  A wastewater contains 8 mg/L O2, 10-3 mol/L NO3 - , and 10-2mol/L organic matter [CH2O] (no significant exchanges withatmosphere occur) After bacterial metabolism is complete, which ofthe following...
- Q Briefly compare and contrast the S N 1 and S N 2 mechanisms interms of kinetics, steric effect, nature of the nucleophile, andthe nature of the leaving group.
- Q Consider the following reaction: H2(g)+I2(g)⇌2HI(g) A reactionmixture in a 3.74 L flask at a certain temperature initiallycontains 0.767 g H2 and 96.8 g I2. At equilibrium, the flaskcontains 90.2 g...
- Q 20 g of CaCl2 is added to a small amount of water in the flask.Additional water is added to bring the total volume of solution to0.75 L.(a) Calculate the concentration...
- Q A student ran the following reaction in the laboratory at 684 K:N2(g) + 3H2(g) 2NH3(g) When she introduced 3.26×10-2 moles of N2(g)and 6.07×10-2 moles of H2(g) into a 1.00 liter...
- Q how many kj of heat are absorbed when 455g of water at 80.0C areheated to 100.0C and then completely evaporated at thistempertature? The Specific heat of water 4.184j/C, g and...
- Q Under which conditions will astream of bullets display an interference pattern in a two-holeexperiment?the bullets have enough speedthe holes are the appropriate distancethe distance to the target is greatenoughThe holes...
- Q You want to prepare 450.0 mL of a 145 ppm K+ ion solution. Thedensity of the solution is 1.01 g/mL. You have at your disposal asolution that is 0.728 M...
- Q At 25 oC a 0.50 g sample of polyisobutylene (apolymer used in synthetic rubber) in 100.0 mL of benzene solutionhas an osmotic pressure that supports a 5.1 mm column of...
- Q A mixture of 6.92e-02 mol of Cl2, 2.15e-02 mol of H2O, 6.78e-02mol of HCl, and 5.04e-02 mol of O2 is placed in a 1.0-L steelpressure vessel at 1447 K.The following...
- Q 1. A mixture containing 2.81 g each of CH4 (g), C2H4 (g) andC4H10 (g) is contained in a 1.50 L flask at a temperature of 35 oC.What is the partial...
- Q 1) Offer a reasonable explanation of why nitration of1,4-dichlorobenzene yields mononitro derivative while N,N'diacetyl-1,4Phenylene- diamine forms dinnitro compound.2) Explain why p- nitrophenol is a stronger acid than phenolitself. Would P-methoxyphenol...
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!