Chemistry question and answers for August 05, 2023
- Q 8.81) How many moles of a gas will occupy a volume of 0.61 L ata temperature of 331 K and a pressure of 3.0 atm ?8.112) Part A. When fully...
- Q Please answer in atleast 1 paragraph...1. Please explain the principle of affinity chromatography andthen provide many (two or three) specific examples.2. Describe the difference b/t step-gradient and the lineargradient. What...
- Q A desert experiences much wider daily temperature variationsthan does a humid environment. Explain why this occurs.
- Q A particular orange light has a wavelength of 592.0 nm. a. What isthe frequency (in Hz) of this light? b. What is the energy (in J)of exactly one photon of...
- Q Calculate the Eocell for: Fe(s) + Br2(g)→  Fe2+(aq) +Br-(aq) ; is thiselectrolytic or voltaic?A.-1.52V ; voltaicB.1.52V ; electrolyticC.-1.52V ; electrolyticD.1.52V ; voltaic
- Q A 125.0 −mL sample of a solution that is 2.8×10−3 Min AgNO3 is mixed with a 220.0 −mL sample of a solution that is0.10 M in NaCN . After the...
- Q A cylinder with a movable piston is filled at 24oCwith a gas that occupies 36.2cm3. If the maximumcapacity of the cylinder is 65.2cm3, what is the highesttemperature to which the...
- Q Calculate the molar absorptivity of crystal violet using theabsorbance value of the crystal violet solution determined in thelab and Beer’s law. How does this value compare with the value of87,000...
- Q I) Approximately 10 g of iron filings has been placed into awaste container of approximately 2L of 6M HCl.1. Assuming 1 mole of H2 evolved will have the volume of...
- Q A scientist wants to make a solution of tribasic sodiumphosphate, Na3PO4, for a laboratory experiment. How many grams ofNa3PO4 will be needed to produce 550. mL of a solution that...
- Q 5. In Procedure II of Part 2 of the lab you will add the correctratio of water to ice so that the final temperature of the water inthe calorimeter is...
- Q A fajans titration of a 0.9628 g sample containing chloriderequired 31.32 ml of 0.1001 M AgNO3. Express the resultof this analysis in terms of the percent AlCl3 (FW=133.34) in the...
- Q Among Gas Chromatography, NMR spectroscopy, and distillation,which is better at identifying the unknown solvents? Which isbetter at determining % composition? Explain your answers about whyis one better than other two...
- Q The Kc for the following reaction at 225 ∘C is1.7×102.3H2(g)+N2(g)⇌2NH3(g)If the equilibrium mixture contains 0.22 M H2 and 0.017 M N2, whatis the molar concentration of NH3?Express your answer to...
- Q You are given a 5M solution and you need to make the followingdilutions: 1 M, 100 mM, and 25 mM.4A. What is the dilution factor for each of these dilutions?4B....
- Q Which of the following set of quantum numbers (ordered n, â„“, mâ„“,ms) are possible for an electron in an atom? Check all that apply.Check all that apply.5, 3, 0, 1/2-3,...
- Q A 76.00-pound flask of mercury cost $146.00. The density ofmercury is 13.534 g/cm^3.A) Find the price of one cubic inch of mercury by calculatingthe following intermediate values.What is the price...
- Q Justify the following with clear hand writing anddetails: I'll be thankful.- What is the mole fraction of HCl in a 36% by weight aqueoussolution of HCl?- A solution contains 4.00...
- Q How many liters of H2 at STP can be produced from theelectrolysis of aqueous NaCl using a current of 50.0 mA for 1.0hour?
- Q Part A:How much work (in J) is required to expand the volume of a pumpfrom 0.0 L to 2.8 L against an external pressure of 1.2 atm ?Express your answer...
- Q Prescription drugs are important to the health and welfare ofmany. Understanding the behavior of medicines is important toproper use. This assign will explore over the counter (OTC)medicines at a pharmacy....
- Q Calculate theoretical yield, actual yield and percentyield.Data:mass recovered: 12.1188 g.2-methylcyclohexanolMM: 114.2 g/molD: 0.930 g/mLBP: 166 C1-methylcyclohexeneMM: 96.2 g/molD:0.813 g/mLBP: 110 C
- Q Calculate the pH for each of the following cases in thetitration of 25.0 mL of 0.150 M pyridine, C5H5N(aq) with 0.150 MHBr(aq): (a) before addition of any HBr (b) after...
- Q in this example, 2.5 mol of an ideal gas with CV,m=12.47Jmol-1K-1 is expanded adiabatically against a constantexternal pressure of 1 bar. The initial temperature and pressure ofthe gas are 325...
- Q If the surface area of the Pacific Ocean is 1.6176 x 10^8 km^2and the average depth is 4,080 meters, how many moles of water inthe Pacific?
- Q At a certain temperature, the equilibrium constant Kc for thisreaction is 53.3H2 + I2 ---> 2HI<---at this temperature, 0.500 mol of H2 AND 0.500 mol of I2 wereplaced in 1.00L...
- Q 1.The atomic mass unit is presently based on assigning amass of exactly 12 amu to:(a) an atom of carbon isotope13CÂ Â Â Â Â (b) an atom of carbonisotope 12CÂ Â Â Â (c) all carbonatoms(d) the...
- Q I have ONE question for homework that is separated intodifferent parts.1)a) Assume that the kinetic energy of a 1300 kg car moving at 120km/h could be converted entirely into heat.What...
- Q 1)Calculate the pH during the titration of 20.00 mL of 0.1000 MHF(aq) with 0.2000 M LiOH(aq) after 4 mL of the base have beenadded. Ka of HF = 7.4 x...
- Q Using molecular deuterium in the presence of the metal catalystpalladium hydrogenate this alkene: 2,3-dimethylbut-1-ene
- Q We are using 0.75 g of 1,2-dibromo-1,2-diphenylethane adnreacting with 0.75g KOH and 5 mL triethylene glycol to producediphenyl acetylene.What is the theoretical yield?
- Q Balance the following redox reaction if it occurs in basicsolution. What are the coefficients in front of Br2 and OHâ» in thebalanced reaction? Br2(l) → BrO3â»(aq) + Brâ»(aq)
- Q You want to make 750.00 mL of a 0.9550 M aqueous solution ofCr(NO3)2. You have available in lab a bottle of pure Cr(NO3)2 ∙ 6H2O (s), a bottle of 1.672...
- Q A 46.0%/54.0% by volume propane/n-butane mixture is cooled from255°C to 193°C. FInd the change in ethalpy of this mixture byfollowing the steps below. Assume ideal behavior. a) What is theaverage...
- Q How much heat is released when 28.0 g of lithium metal reacts asshown below? (Answer should come out to 448 kJ)2 Li (s) + 2 H2O (ℓ) → 2 LiOH...
- Q Vapour Pressure of Solutions of Non-Volatile or Volatile Solutes22.555 g of a non-volatile solute is dissolved in 215.0 g of water.The solute does not react with water nor dissociate in...
- Q Which of the following about covalent bonding are true?1.There is free rotation around a pi bond2.There is free rotation around a sigma bond3. The electron density in a pi bond...
- Q home / study / science / biology / questions and answers / whichof the following best explains why atp is ... Question: Which ofthe following BEST explains why ATP is...
- Q Mutliple step synthesis for 4-bromoacetanilide from aniline1. during the synthesis of aniline from nitrobenxe, explain whyit was necessary to make the solution alkaline (addition ofNaOH)2. During filtration, why is it...
- Q a)What is the mass (in grams) of the solid product when 7.5 g ofsilver nitrate reacts in solution with excess sodiumcarbonate?AgNO3(aq) + Na2CO3(aq)--> Ag2CO3(s) + NaNO3(aq)[unbalanced]b)What is the mass (in...
- Q Can somebody explain to me the miscibility of isopropanolalcohol and ethanol alcohol in a NaCl solution and why higherlevels of concentration of salt solution make the alcohol lessmiscible (homogeneous)?
- Q During a Structure and Solubility experiment how do youdistinguish between the following:a.) butane and 2-chlorobutaneb.)butane and 1-butanolc.)1-butanol and 2-butanold.)1-butanol and butanoic acid
- Q Which one of the following has the lowest vapor pressure at 25degrees celsius? a) CH3OH b) HOCH2CH2OH c) CH3OCH3 d) CH3CH2OH
- Q Refer Appendix G in the text in order to determine the standardfree energy change for each of these reactions. Determine whetheror not the reaction is spontaneous under standard conditions (298K,...
- Q Ethyl alcohol has a vapor pressure of 20.0mm Hg at 8.0 ° C and anormal boiling point of 78.4 ° C.Estimate the vapor pressure at 45° C using (a) the...
- Q What mass of propane will occupy the same volume as 0.057 mol ofbutane at 1.00 atm and 298 K?My answer: 0.057m x 0.0821Latm/Kmol x 298K =1.4 LSuppose a student performed...
- Q calculate the molar mass? calculate the value of the freezingpoint depression constant, Kf, for acetic acid.Trail 1Trail 2Mass of acetic acid1.735g2.195gMass of acetylsalicylic acid0.06g0.09gFreezing point14.247C14.247Change in temperature0.852C0.852C
- Q A 0.5072 g solid sample containing a mixture of LaCl3 (molarmass = 245.26 g/mol) and Ce(NO3)3 (molar mass = 326.13 g/mol) wasdissolved in water. The solution was titrated with KIO3,...
- Q How many mL of 12 M HCl will be needed to prepare 500 ml of 1.2ppm HCl solution? What is the pH of this 1.2 ppm HCl solution?Using the right...
- Q Assuming you use 2.5 g vanillin and 5.0 mL of a 3.42 M NaBH4solution, what is the theoretical yield of vanillyl alcohol inmoles? in grams?
- Q A 10.00 mL sample of 0.150 M sodium azide, NaN3, a weakbase, is titrated with 0.100 M HCl. Calculate the pH afterthe addition of the following volumes of acid:(a) 0.00...
- Q A gas cylinder contains 2.30 mol He, 1.35 mol Ne, and 1.75 molAr. If the total pressure in the cylinder is 2290 mmHg, what is thepartial pressure of each of...
- Q 6. Calculate the concentration of H3O + or HO- , as indicated,when each of the strong acids below is dissolved in the indicatedtotal volume of water.a) 1.5 moles of HBr...
- Q Calculate the ph of 0.125M of NaAc
- Q PART A: 137 nmol of an antibody that binds strongly to theantigen protein G is covalently bound to the support of an affinitycolumn with a void volume of 1.95 mL....
- Q 20#15Given the following half-reactions and associated standardreduction potentials:AuBr−4(aq)+3e−→Au(s)+4Br−(aq)E∘red=−0.858VEu3+(aq)+e−→Eu2+(aq)E∘red=−0.43VIO−(aq)+H2O(l)+2e−→I−(aq)+2OH−(aq)E∘red=+0.49VSn2+(aq)+2e−→Sn(s)E∘red=−0.14Va) Write the cell reaction for the combination of thesehalf-cell reactions that leads to the largest positive cellemf.b) Calculate the value of this...
- Q A heater burns normal octane(n-C8H18)using 20.0 percent excess air. Combustion is complete. The flue gasleaves the stack at a pressure of 100 kPa and a temperature of1600C.a) Calculate the complete...
- Q A 2.55 L sample of gas at STP contains hydrogen and oxygengases. The mole fraction of hydrogen is 0.60. When the sample iscombusted to form water, calculate the mass of...
- Q A 12.0 % NaCl(aq) has a density of 1.05 g/mL. What isthe molality of the solution?
- Q Upon heating, potassium chlorate decomposes to potassiumchloride and oxygen gas. The oxygen gas is collected over water at14.0 °C in a 500.-mL container. If the total pressure is 766torr,How many...
- Q 1. What is the principal use of calcium proprionate (the calciumsalt of propionic acid) based from The Merck Index?2. What is the result of treating calcium chloride with oxalicacid?3. Explain...
- Q At 1 atm, how much energy is required to heat 73.0 g of H2O(s)at –22.0 °C to H2O(g) at 121.0 °C?
- Q What is the pH at the equivalence point 10.0 mL of 1.00 MNH3 (Kb = 1.8 x 10-5) is titratedagainst 2.00 M HCl?
- Q Calculate the following quantities for the reaction in whichammonia is formed from its atomic components:a) The stoichiometric coefficients of the reactants andproducts.b)The stoichiometric ratio ofN2 to H2.c)(moles NH3produced)/(mole N2 reacted)d)(lbm...
- Q What is the molar solubility of CaF2 in 0.10 M NaFsolution 25 degrees C?The Ksp for CaF2 is3.4x10-11.The answer is 3.4x10-9 M. Please explain how to getto that answer. Thank...
- Q 1. Listed below are the atomic weight, density, and atomicradius for three hypothetical alloys. For each determine itscrystal structure and then justify your determination.Alloy // Atomic weight (g/mol) // Density...
- Q Cyanide recovered from the refining of gold orecan be determined indirectly by EDTA titration. A knownexcess of Ni2 is added to the cyanide to formtetracyanonickelate(II):4CN + Ni ---> Ni(CN)4When the...
- Q How many unique 1 H NMR signals exist in the spectrum of thefollowing compound: 1,3-dibromobenzene?
- Q calculate the ph of a solution made by mixing 20.0 ml of 0.200 mh2so3, 10.0 ml of 0.120m naoh, 10.0ml of 0.150 m hcl, and 10.0ml of0.200 m na2so3. (pka1:...
- Q Saturdated water vapor (steam) is commonly used as a heat sourcein heat exchanger applications. Why saturated vapor? Whysaturated water vapor? In a plant of any reasonable size,several varieties of saturated...
- Q 1. Write a balanced equation for the complete combustion of eachof the following:a. 2,2-dimethylbutaneExpress your answer as a chemical equation. Identify all of thephases in your answer.b. Â Â cyclopentaneExpress your answer...
- Q 1. A coupon of very pure Gold and highly clean surface isexposed to an Argon Fluoride (ArF) excimer laser beam of wavelength193.4±0.2 nm inside an ESCA (Electron Spectroscopy for ChemicalAnalysis)...
- Q The fundamental vibrational transition of the 12C16O in theelectronic ground state from v=0 to v=1 occurs at 2,170 cm-1. Thebottom of the Morse potential for the anharmonic oscillator is wellapproximated...
- Q 5. Surface energy (2 pts). Let’s use the concept of surfacetension as surface energy per unit area to see if we can estimate,at least to the correct order of magnitude,...
- Q Draw a titration on a molecular level. Clearly indicate thetitrant and substance being titrated as well as the products of thereaction.
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