Chemistry question and answers for August 14, 2023
- Q A student finds that a mixture of acetone and water at 740 mmHgboils at 68 Celcius. Pure acetone has a vapor pressure of 1200 mmHgand water has a vapor pressure...
- Q The acid dissociation constant of the 1,10-phenanthrolium ion(phen) was meeasured at different temperatures using spectroscopicmethods.The values of pKa measured at 298K and 308K were 4.812 and4.731, respectively.Part A:Calculate  ΔrGo at 298K.Express...
- Q Exercise 2.58. Part A:Determine the number of Kr atoms ina 5.55 −mg sample of krypton.Part B:Determine the molar mass, M, of anelement if the mass of a 2.80×1022−atom sample of...
- Q QuestionsA.     Use your results to determineif the forward reaction in the potassium chromate/HCl reactionendothermic or exothermic. Explain your answer, using Table 1 tohelp construct your thoughts.B.     Write the equation for...
- Q For the reaction SO2(g) + NO2(g) == NO(g)+ SO3(g), Kc = 85.0 at 460
- Q give us your version of Emil Fischer's proof of the structure ofglucose. You do not need to flesh out Fischer's proof to reveal thestructures of all the D-aldopentoses and D-aldohexoses,...
- Q The molecular weight of anhydrous calcium chloride is 110.99grams/mol. How many grams do you need for 750 ml of 250uM calciumchloride?2. Ethanol is supplied in a 90% solution. You need...
- Q Calculate the free-energy change for ammonia synthesis at 25 ?C(298 K) given the following sets of partial pressures:a.1.0 atm N2, 3.0 atm H2, 0.020 atm NH3b. 0.010 atm N2, 0.030...
- Q A 0.100 M solution of a weak base has a pH of 9.95. What is thebase hydrolysis constant, Kb, for the weak base?
- Q I am wondering what the rule is for determining functional grouppositions for the most stable chair and boat conformations ofcyclohexanes; meaning basically is there a pattern as to whetherthe functional...
- Q When 2.65 g of an unknown weak acid (HA) with a molar mass of85.0 g/mol is dissolved in 250.0 g of water, the freezing point ofthe resulting solution is -0.257...
- Q After recrystallizing an impure sample of benzoic acid, astudent scratched it off the filter paper and took a melting point.Most of the compound melted between 121 and 122 degrees Celsius....
- Q What volumes of 1.0 M NH4NO3 and 1.0 M NH3 would be required toprepare 2.00 L of a bufferwith a pH of 9.00? The Kb of NH3 is 1.8 ×...
- Q 1. Calculate the pH of a solution prepared by mixing 2.50 L of2.35 M HF with 4.50 L of 1.56 M NaF.2. A 4.00-g sample of NaOH is added to...
- Q A)Titration of an acidic solution of Na2C2O4 withKMnO4(aq).Which species is the reducing agent?Express your answer as an ion.I know the reducing agent is the Na2C2O4 but I need the IONform.B)A...
- Q A 40.0 mL of 2.00 M Fe3+ (aq) solution are mixed with60.0 mL of 3.00 M SCN- (aq) solution. What is theequibrium concentratio of FeSCN2+ (aq), if the complexformation constanst...
- Q The automobile fuel called E85 consists of 85% ethanol and 15%gasoline. E85 can be used in so-called flex-fuel vehicles (FFVs),which can use gasoline, ethanol, or a mix as fuels. Assume...
- Q Ionization energy is an inconsistent trend. For instance, theionization energy of oxygen is lower than that of nitrogen and theionization energy gallium is less than that for zinc. Suggestreasons this...
- Q 1) A first-order reaction has a half-life of 15.5 s . How longdoes it take for the concentration of the reactant in the reactionto fall to one-eighth of its initial...
- Q With an H2SO4 concentration of 85% how many moles of water willbe available to the reaction when 9.0 mL of 85% H2SO4 is used?(Density of 85% H2SO4 is 1.7 g/mL)...
- Q A) 7mL of a 0.1M CaCl2 solution was diluted to a final volume of150mL. Please determine the concentration of Cl- in thissolution.B) Explain why creating astandard curve is better than...
- Q Aballoon has a volume of 2.33 L at a temperature of 25.0 C and apressure of 1.06 atm. If the balloon is allowed to rise to a highaltitude, where the...
- Q QuizPage 10 of 10A sample of an unknown metal with a mass of 17.8 grams is heatedin boiling water to a temperature of 98.0°C. The piece of metal istransferred to...
- Q H2A is a diprotic acid with Ka1+1.43 x 10^-3 and Ka2=2.01 x10^-6. Consider the titration of 50.0mL of 0.300 M Na2A with 0.150M HCL. Find the pH at the following...
- Q The experiment is Determination of Acetic Acid inVinegar. Please answer as many questions as you can.What are primary and secondary standards? Give examples.What is KHP and why was it used...
- Q How many grams of dipotassium succinate trihydrate(K2C4H4O4�3H2O, MW = 248.32 g/mol) must be added to 540.0 mL of a0.0306 M succinic acid solution to produce a pH of 5.969? Succinicacid...
- Q A 21.31 gram sample of cobalt is heated in the presence ofexcess fluorine. A metal fluoride is formed with a mass of 41.93 g.Determine the empirical formula of the metal...
- Q You are given a solution and asked to analyze it for the cationsAg+, Ca2+, and Zn2+. You add HCl and a white precipitate forms. Youfilter out the solid and add...
- Q The experiment is Gravimetric Determination ofCa2+. Please answer as many questions as youcan.Write all the balanced equations involved in thisexperiment.What is the purpose of urea? Can another base like NH4OH...
- Q For a Michaelis-Menten reaction, k1=5*107 M-1S-1, k-1=2*104 S-1and k2=4*102S-1. Calculate the Km and Ks for this reaction. Does thesubstrate achieve equilibrium? How would inspection of the rateconstant immediately have given...
- Q 4) a) Describe, in detail, why metals are good conductors ofelectricity.b) How are semiconductors different from “regular†metals, andhow can this be controlled to allow for modern electronics.
- Q A 50 mL solution of 0.02500 M maleic acid (ka1=1.3e-2,ka2=5.9e-7) was titrated with 0.100 M NaOH. Calculate the pH afterthe adiition of a) 0.00 mL, b) 9.00 mL, c) 12.50...
- Q Calculate [Ag1+] in solution at equilibrium when 2.39x 10-2 M AgNO3 is added to 1.00 L of a 1.65 MNH3 solution, assuming no volume change? (Kffor Ag(NH3)21+ is 1.1 x107)a)...
- Q first, discussion about Essential ElementsSome elements are essential to our health, like oxygen thatmakes up carbohydrates, fats, proteins, and DNA. Mention anothertwo elements (essential or non-essential) and discuss theirfunction in...
- Q Explain resonance stabilization from the MO perspective
- Q What is the mole fraction of ethanol in a solution made bydissolving 29.2 g of ethanol, C2H5OH, in 53.6g of water?0.1760.2130.5450.352
- Q Balance the following skeleton reactions and identifythe oxidizing and reducing agents:MnO4-(aq) + CN-(aq) --> MnO2(s) + CNO-(aq) [basic]
- Q 1.) Explain the following observations in terms of shiftingequilibria by Le Chatelier's Principle. Write the equation for theequilibrium involved in each case.a.) barium chromate, BaCrO4, is insoluble in basic solution...
- Q You wish to prepare 50.00 mL of 0.0600 M NH3 fromconcentrated ammonia (15.28 M) by serial dilution using a 50 mLvolumetric flasks, a 1.00 mL volumetric pipet, and a 10.00...
- Q in step 32 a student added 150 mL of water to the beakercontaining 10 mL of unknown metal nitrate solution instead of 100mL of water as instructed? will this experiment...
- Q Clearly and concisely explain how ionic (ion exchange)tempering of glass increases its strength (note that this is reallytwo questions-1) what is ionic tempering? and 2) how does it affectglass properties?)Please...
- Q 3. Calculate the density of NO at STP and at 20.0 ï‚°C and 720torr.4. The volume of a mass of gas is 300 ml at 25 ï‚°C and 685 torr.What...
- Q Tungsten trioxide (WO3) has a rich yellow color and is oftenused as a pigment in ceramics and paints. In order to test aceramic vase for its WO3 content, a 10.05...
- Q Can you balance these redox equations? I am having troublefiguring out the process of adding extra products to make themwork.ClO3- + Cl- ----->Cl2 + ClO2-Cr2O72- +C2O42- -----> Cr3+ +CO2
- Q 1. Vinegar consists of acetic acid, CH3COOH, and water. Writeout the equilibrium expression for acetic acid reacting withwater.2. Citric acid, H3C6H5O7, contributes to the acidity of manyfoods. Write out the...
- Q how many moles of water are produced when 24.3 mL of .100 MNaOH is mixed with 22.4 mL of .08 M acetic acid
- Q The compound known as butylated hydroxytoluene, abbreviated asBHT, contains carbon, hydrogen, and oxygen. A 1.126 g sample of BHTwas combusted in an oxygen rich environment to produce 3.373 g ofCO2(g)...
- Q A scientist would like to use thermal diffusion to dope thesilicon wafer. He decides to deposit 10 nm Boron on the surface andheat up the wafer to allow Boron to...
- Q Nickel metal reacts with sulfuric acid in a redox reaction. Inan experiment, 1.25g of nickel reacted with 55.0ml od 0.110Msulfuric acid. Hydrogen gas was collected in a 150.0ml container.The reaction...
- Q Using theMichaelis-Menten equation, derive an expression that willdetermine Kmas a function or interms of Vmax,V0and [S]. With thisderived equation then calculate:a)KmB) Indicate ateach substrate concnetration whether this Km changes with...
- Q thanksFe+3 + SCN-----><----FeSCN+2You mix the following:Volume of KSCN solution 4.27 mLOriginal concentration of KSCN solution 0.00495 MVolume of ferric ion solution 4.74 mLOriginal concentration of ferric ion solution 0.02488 MVoluume...
- Q 1) A bottling plant has 1.26521×105 bottles with acapacity of 355 mL , 1.08937×105 caps, and4.8740×104 L of beverage.-How many bottles can be filled and capped, how many bottlesleft over,...
- Q A 75 watt incandescent light bulb and an 18 watt compactfluorescent bulb are equally bright. How much warmer will aninsulated closed 12 by 11 by 8.0 foot room get in...
- Q ​When a 1.50 g sample of aluminum metal is burned in an oxygenatmosphere, 2.83 g of aluminum oxide are produced. However, thecombustion of 1.50 g ultrafine aluminum in air results...
- Q Calculate the standard heat of reaction for the dehydrogenationof cyclohexane to benzene in the vapor phase.C6H12 = C6H6 + 3H2The reactor for this system operates at 70% conversion ofcyclohexane. If...
- Q A certain weak acid, HA, has a Ka value of2.0×10−7.Part A: Calculate the percent ionization of HA in a 0.10M solution.Part B: Calculate the percent ionization of HA in a...
- Q Use the information provided in appendix to answer the followingquestions:a) Calculate the Kb of Acetateionb) Calculate the pKa of theanilinium ion(C6H5NH3+)c) Calculate the Kb ofNO2-d) Calculate the pKb of the...
- Q 20 microliters of 1% H2O2 (weight by volume) was added to 2980microliters of water to make 3000 microliters of solution.(a) What is the concentration of H2O2 for this scenario?(b) What...
- Q Half-reaction E° (V) Br2(l) + 2e- 2Br-(aq) 1.080VSn2+(aq) + 2e- Sn(s) -0.140VAl3+(aq) + 3e- Al(s) -1.660V(1) The weakest oxidizing agent is: enter formula (2) Thestrongest reducing agent is: (3) The...
- Q 2. Which of the following statements is true (explainwhy)?a. A sample of oxygen gas at 273K will have a higher urms than asample of oxygen at 1000Kb. A sample of...
- Q Decide which of the following statements are true and which arefalse.1. Real gas molecules behave most ideally at high temperatureand low pressure.2. At constant temperature, the heavier the gas molecules,...
- Q A compound has a pKa of 7.4. To 1 L of a 0.1 M solution of thiscompound at pH 8.0 is added 10 mL of 3.0 M hydrochloric acid. Whatis...
- Q 1. (I)- Calculate pH and pOH to 2 decimal places for thefollowing:a) 1.43×10-1 M CaH2b) 8.77×10-3 MKH(II)- Determin pH&pOH to two decimal places for a solutionthat is produced by:c) by...
- Q Calculate the [H3O+] of each aqueous solution with the following[OH-]. 1) NaOH, 1.6x10^2 M. 2) milk of magnesia, 1.0x10^-5 M. 3)aspirin, 2.2x10^-11 M. 4) seawater, 2.5x10^-6 M.
- Q Propranolol is an adrenergic antagonist. Compare thestructure of propranolol with noradrenaline and identify whichfeatures are similar in both molecules. Suggest why this moleculemight act as an antagonist rather than an...
- Q Given the following solution, 50.00 mL 0.10M Potassium Chlorate,K2CrO4 answer the following.1) What volume(mL) of the solution contains 5.00 x 10^-4 milesof the solute?2) What volume of the solution contains...
- Q Use both the van der Waals and the Redlich-Kwong equations tocalculate the molar volume of CO at 200K and 1000bar. Compare yourresult to the result you would get using the...
- Q How much energy (in kJ) is required to convert a 2.56 lb blockof ice at -12.5oF to steam at 234oF? Use the space provided on thispage to draw a complete...
- Q Part BA 50.0-mL volume of 0.15 M HBr is titrated with 0.25 M KOH.Calculate the pH after the addition of 13.0 mL of KOH.Express your answer numericallyPart CA 75.0-mL volume...
- Q 1- Brief discussion of column chromatographic separation(solvent polarity, elution of compounds etc.)2- Relationship between polarity and thin layerchromatography​.
- Q 1- Brief discussion of column chromatographic separation(solvent polarity, elution of compounds etc.)2- Relationship between polarity and thin layerchromatography​.
- Q for each of the following electromagnetic radiation sources,tabulate the frequency (Hz), the wavenumber, the energy (eV), andthe region of the electromagnetic spectrum (IR, vis, etc.)a. frequency doubled Nd:YAG laser at...
- Q Ammonia gas will react with oxygen gas to yieldnitrogen monoxide gas and water vapor. write balanced chemicalequation, how many moles of ammonia will react with 6.73goxygen?
- Q At what pressure does the boiling point of water become 350°C?If oceanic pressure increases by 0.5 atm for every 5 m, to whatocean depth does this pressure correspond? ΔHvap,m for...
- Q MW (g/mol) / MP ( oC) / Solubility in cold H2O (g / 100 mL) /Solubility in boiling H2O (g / 100 mL)Acetanilide 135.2 / 114 / 0.54 / 5.0Phenacetin...
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