Chemistry question and answers for October 04, 2023
- Q A student conducted an experiment to determine what factors areimportant in the rate of a reaction between potassium carbonate andhydrochloric acid. The student diluted 2.000 mL of 4.000 M K2CO3...
- Q calculate the ph of a solution when 15ml of 0.5M naoh is addedto 30ml of a 0.8 M benzoic acid (Benzoic acid is a monoprotic acidand has a ka of...
- Q Explain the IMFs for theFollowing and wether they are soluble, insoluble or partiallyinsoluble:-Acetone and Butanol, acetone and ethanol, acetone and CCl4,acetone and hexane, acetone and H2O-Butanol and ethanol, butanol and...
- Q Which of the following aqueous solutions are good buffersystems? and Why?.0.19 M potassium hydroxide +0.27 M potassiumbromide.0.28 M hydroiodic acid +0.18 M sodiumiodide.0.30 M ammonia +0.37 M ammoniumnitrate.0.17 M hypochlorous...
- Q Part AA solution of water (Kf =1.86 ∘C/m) and glucosefreezes at − 4.75 ∘C. What is the molal concentration of glucose inthis solution? Assume that the freezing point of pure...
- Q Can someone please give me the chemical equation and directionson how to test for each individual solution below and how to tellif my solution has one of each category? So...
- Q What is the first f element in the 6th period towhich Hund's rule must be applied when writing the orbitaldiagram?
- Q calculate the partial pressure of CO2 over calcium carbonate at1000K
- Q Q1)A compound of molar mass 213 contains only carbon, hydrogen,iodine, and oxygen. Analysis shows that a sample of the compoundcontains 6 times as much carbon as hydrogen, by mass.Part ACalculate...
- Q Cu(II) sulfate exists as a hydrate. It has many practical usesincluding use as a fungicide and pesticide. When mixed withchromium and arsenic it forms the wood preservative called CCA. CCAwas...
- Q Derive planar density expressions for BCC (110) planes interms of the atomic radius R.
- Q 2. Which gas has the lowest density at 25 °C and 1 atm?Select one:a. O2b. Arc. N2d. F2e. C3H84. If the volume of a confined gas is expanded to four...
- Q Write the balanced complete ionic equations and net ionicequations for the reactions that occur when each of the followingsolutions are mixed. (Type your answers using the format [NH4]+ forNH4+ or...
- Q FAST ANSWER PLEASE FOR BUFFER SOLUTION QUESTION. Wouldappreciate full working out thanks.Solution C is made by mixing 55.6 mL of 0.16 M ammonium chloride(NH4Cl) with 60.3 mL of 0.26 M...
- Q Which reactant, and how much of it, remains after the reactionof 40.0g of V2O5 (FW=181.9g/mol) with 40.0gof calicuim based on the following chemical equation?V2O5 + 5Ca----> 2V+5CaOPossible Answers0.810g Ca3.6g Ca.801g...
- Q The following question deals with nickel(II) nitratehexahydrate.a) What is the molecular formula for nickel(II) nitratehexahydrate?b) What is the molar mass of nickel(II) nitrate hexahydrate?c) What is the concentration of a...
- Q A student dissolved 5.05 g of KNO3 in 100.302 g ofwater. The temperature changed from 25 to 21.7°C. Calculate theenthalpy of solution the student experimentally found in kJ/mole ofKNO3. Is...
- Q Calculate the equilibrium concentration of [FeSCN2+] in Part Aif 10.0mL of 2.0x10-3M KSCN and 25.00mL of 0.0020M Fe(NO3)3 arediluted to 100.0mL.Hint: Answer includes 2 significant figures.Hint: See \"PREPARATION OF STANDARD...
- Q Consider the following reaction:CO(g)+2H2(g)⇌CH3OH(g)A reaction mixture in a 5.15 −L flask at a certain temperaturecontains 26.5 g CO and 2.34 g H2. At equilibrium, the flaskcontains 8.65 g CH3OH.Part ACalculate...
- Q Write the balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous Nal. Include phasesWhat mass of precipate will form if 1.50L of highly concentratedPb(ClO3)2 is mixed with 0.400L of...
- Q Part A: Using your graduated cylinder, you calibrate the pipetyou will be using and the values you collect are as follow. What isthe average number of drops per mL of...
- Q closed
- Q How would you prepare a 1.50 molal solution of sucrose in water?At what temperature would the solution begin to boil?thank you
- Q Determine pH for a solution containing 0.7 M HBr and 1.4 MHC3H5O2.
- Q In the Bohr model, when an electron leaves one n orbit andenters another n orbit, a photon is either emitted or absorbed.Derive a relationship between the wavelength of the emitted...
- Q What are open tubular columns and give somedifferences between open tubular column and packed column
- Q Perform each of the following conversions.Part A1.3 in to mmExpress your answer using two significant figures.Part B115. ft to cmExpress your answer using three significant figures.Part C1740. kg to lbExpress...
- Q You are asked to prepare 1.1L of a HCN/NaCN buffer that has a pHof 9.77 and an osmotic pressure of 1.97atm at 298 K.What masses of HCN and NaCN should...
- Q Methanol’s toxicity is related to theway the body metabolizes it. Describe what happens and what theeffects of exposure to methanol are?
- Q Discuss differences in ordering of the aluminum in thetetrahedral site of each of the potassium feldspars and how this isreflected in the crystal system of each. What is ordering in...
- Q Give the IUPAC name for the following compound:Interactive MarvinView
- Q Part A) Balance the following using the ½reaction methodPermanganate ion plus bromide ion yields manganese oxide andBrO3 -      (basic solution)Part B) Given the following data and usingHess’ Law, Calculate change...
- Q At a particular temperature the equilibrium constant for thereaction: H2(g) + F2(g) ⇔ 2HF(g) is K = 81.0. A reaction mixture ina 10.00-L flask contains 0.25 moles each of hydrogen...
- Q Consider the following balanced equation.SiO 2 (s)+3C(s)→SiC(s)+2CO(g) Complete the following table, showingthe appropriate number of moles of reactants and products. If thenumber of moles of a reactant is provided, fill...
- Q You prepare 50 mL of 50 mM HEPES buffer at pH 7.4. Indicate theamounts of each of the following reagents you would use (ifapplicable)?HEPES ______(g); 10 M NaOH______(mL); 1 M...
- Q A) For Gorilla glass, Xensation, Sapphire glass, and Dragontrailglass, tabulate their composition, how they are made and processed,their hardness, strength, and cost.? Please, noEnglish (Merican) units..Answer the question in clear...
- Q It is written as 3.0 M HCl. What does the “M†mean for “3.0 MHCl�In the reaction, bubbles form which indicates that the reactionis going. What are those bubbles of...
- Q Calculate the pH after addition ofa) 0.00 mLb) 25.00 mLc) 50.00 mLd) 60.00 mLof 0.1000 M HCl in the titration of 50.00 mL of 0.1000 Mhydrazine.Ka(N2H5+)=1.05×10−8.Please show all steps thank...
- Q 1) When 2.69g of a nonelectrolyte solute is dissolved in waterto make 655 mL of solution at 23 C, the solution exerts an osmoticpressure of 877 torr.What is the molar...
- Q You have a flask in your laboratory on which the label issmudged. From what you are able to read, it is a solution of amonoprotic acid (we�ll call it HX)...
- Q The following information is to be used for the next twoquestions. Molar absorptivity data for the cobalt and nickelcomplexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi =5520 at 510...
- Q Indicate whether the entropy of the system increases, decreases,or is unchanged for each of the following processes:a) water evaporates at room temperatureb) a gas condenses at its normal boiling pointc)...
- Q What are chemicals? List three chemicals and explain how theymay be beneficial or detrimental to humans or the environment.
- Q Calculate the standard enthalpy change for the reaction2A+B⇌2C+2DUse the following data:SubstanceΔH∘f(kJ/mol)A-243B-397C191D-525
- Q The Ka of a monoprotic weak acid is 8.6x 10-6, what is the pH ofa 0.38 M solution of this acid?
- Q Using 1.0 nM enzyme X for the enzyme kinetics experiments, youobtained the reaction rates at different concentrations ofsubstrate (shown in the following table). Assume that the enzyme Xfollows a typical...
- Q Determine the molar enthalpy ofneutralization(DeltaHneutralization); where, Volume of HCl=100mL,Molarity of HCl=2.00M, Volume of NaOH=100mL, Molarity ofNaOH=2.00M, Average initial temperature of acid and base=22.50 C,Final temperature=35.50 C, Heat capacity of the...
- Q Calculate the percent ionization of propionic acid (C2H5COOH) insolutions of each of the following concentrations (Ka is given inAppendix D in the textbook). Ka=1.3*10^-5 Part A 0.250 M . Expressyour...
- Q An electron in a Hydrogen atom originally at n=5energy level absorbs a photon with a frequency of 6.54×10^13 andthen proceeds to emit another photon with a frequency of2.98×10^14. To what...
- Q during cation exchange chromatography, what is the pattern in whichthese amino acids would be eluted? please explain the reason behindthe elution pattern.amino acids are leucine, aspartic acid, alanine, lysine andphenylalanine.
- Q : Let’s consider second-law thermodynamics again, we defineï„Suniv=ï„Ssys + ï„SsurrExplain the physical meaning of three symbols here:ï„Suniv, ï„Ssys , ï„SsurrWhich of these three determines if a proposed process isspontaneous or...
- Q What is the percent water by weight of lithium perchloratetrihydrate?
- Q What difference in the properties of 0.1 M HCl and 0.1 M aceticacid caused the pH's of equal volumes of each to differ?
- Q 1. Glucose has a solubility of 125 g /100 mL. What is theapproximate concentration of glucose in asaturated solution? How much glucose can be dissolved in 745 mL ofwater?[glucose] _________...
- Q 1. An enzyme has a molecular weight of 25,000. IfVmax= 80umol/min and you use 500uL of a 1mg/mL solutionof enzyme, what is the turnover number?2. In an enzyme activity assay,...
- Q Calculate the theoretical amount of NaBH4, needed to convert 100 mgquantities of benzil to benzoin, and benzil to hydrobenzoin.
- Q Discuss how screening can be used for mass spectra
- Q Calculate the pH of each of the following strong acidsolutions.(a) 0.00512 M HBrpH =Â Â (b) 0.633 g of HI in 18.0 L of solutionpH =Â Â (c) 44.0 mL of 3.90 M HBr...
- Q #3 R&D Exp. 26Should Cu(OH)2 precipitate in 3 M NH3 ifthe original [Cu2+] is 0.1 M ( the Kb forammonia is 1.6x10-5)?Please show work and explain a little of how...
- Q Assuming 100% dissociation, calculate the freezing point andboiling point of 2.79 m K3PO4(aq). Constants may be found here.SolventFormulaKfvalue*(
- Q Can anyone explain the complete mechanism of a nitrile with agrignard reagent to form a ketone?
- Q Identify the incorrect statementA) At equilibrium the concentration of the rectants is equal tothe concentration of the productsB) A change in temp will change the value of the equilibriumconstantC) Removing...
- Q which species will have the greatest absolute entropy at 25degrees celcius Ne (g),C2H2(g)Ne (g)H2O(l)C2H5OH (l)C4H10 (g)thanks
- Q Here are some problems and their answers. I would appreciate ifsomeone could please explain step by step how to get these answers?I need to understand this concept.The following questions refer...
- Q 1. Write the solubilityequilibrium and the solubility product expression for the followingsparingly soluble salts.CaCO3Cu2SSb2S32. The solubility of silver bromide, AgBr, at 25
- Q show me step by step calculations on enthalpy of formation ofhydrogen peroxide
- Q determine the balanced thermochemical equation for the oxidation ofone mole of sucrose. is the reaction gaining or losing energy?(Show this with an equation)Determine the energy generated by eating one serving...
- Q I recall on more than one occasion when our kids were small, wewould come inside from playing in the snow and I would make hotchocolate by heating the milk in...
- Q How would you do the problem... What is the concentration inmmole/L of a Ca2+ solution that is 2.10 mEq/L ?
- Q 1. When crotyl chloride is treated with sodium iodide inacetone, it reacts much faster than n-butyl chloride, even thoughboth are primary alkyl halides. Explain the rate difference.2.The most significant difference...
- Q a 2.00 mL sample of vinegar is titrated with 15.86 mL of 0.350M NaOH to a phenolphthalein end pointA) calculate the molar its of acetic acid in the vinegarsolutionB) calculate...
- Q A galvanic cell (battery) is represented by the shorthand below.Look up the standard half cell potentials in your textbook or onthe internet. (Make sure you select the half reactions thathave...
- Q Peak intensity from a mass spectrum gives you what informationabout a compound?-The relative abundance of each ion proportional to the mostintense (base) peak-The mass of each fragment-The total number of...
- Q Hi,I have some Organic Chemistry lab questions that I'm stuck on.Please explain in complete sentencesThanks in advance1. Describe the likely cuase and a reasonable solution for eachproblem encountered:A. After spotting...
- Q 1. Balance the following oxidation-reduction reactions using thehalf-reaction method and tell the number of electrons transferredin the balanced oxidation-reduction reactiona) S2-(aq) + NO3-(aq) --->S8(s) + NO2(g) acidic solutionb) MnO4-(aq) +...
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