Chemistry question and answers for October 07, 2023
- Q How do I identify HOMO and LUMO when given orbitals
- Q A 1.000-mL aliquot of a solution containing Cu2 and Ni2 istreated with 25.00 mL of a 0.05832 M EDTA solution. The solution isthen back titrated with 0.02380 M Zn2 solution...
- Q Silver bromide is used to coat ordinary black-and-whitephotographic film, while high-speed film uses silver iodide.(a) When 96.0 mL of 5.0 g/LAgNO3 is added to acoffee-cup calorimeter containing 96.0 mL of...
- Q The combustion of acetylene C2H2 is a spontaneous reaction givenby the equation: 2C2H2 (g) + SO2(g) --> 4CO2 (g) + 2 H2O(l)As expected for a combustion the a combustion the...
- Q Dinitrogen pentoxide (N2O5) decomposes in chloroform as asolvent to yield NO2 and O2. The decomposition is first order witha rate constant at 45 oC of 1.0 x 10–5 s–1. Calculate...
- Q In a study designed to prepare new gasoline-resistant coatings,a polymer chemist dissolves 6.077 g poly(vinyl alcohol) in enoughwater to make 100.0 mL of solution. At 25
- Q Suppose you titrate 80.0 mL of 2.00 M NaOH with 20.0 mL of 4.00M HCl. What is the final concentration of OH- ions.
- Q Calculate the equivalence point potential for the titration offerrous ion with dichromate ion in H2SO4
- Q Show the complete mechanism for the acid-catalyzed reaction ofacetaldehyde with ethanol to form an acetal.
- Q Freezing point depression can be used to experimentallydetermine the van't Hoff factor of a solute in solution. Given thedata in the table, please answer the questions below and determinethe \"real\"...
- Q Given the following solubilities in grams/100ml of water (theseare the amounts that stay in solution at these temperatures):caffeine 1.35g (16 degrees Celcius) 45.5g (65 degreescelcius)NaCl 35.7g (0 degree celcius) 39.1g...
- Q If you start with 3.0×10^10 I−131 atoms, how many are left afterapproximately 1month? I−131 has a half-life of 8.0 days. Expressyour answer using two significant figures.
- Q An unidentified covalent molecular compound contains onlycarbon, hydrogen, and oxygen. When 7.40 mg of this compound isburned, 21.98 mg of CO2 and 3.00 mg of H2Oare produced. The freezing point...
- Q I have a few questions relating to ph and whatnot..1) Calculate the pH of 0.0010 M Ca(OH)2 solution. (to2 decimal places)2) Determine the pH of a KOH solution made by...
- Q Draw an example of an octahedral complex that takes part in aligand to metal charge transfer.
- Q Whymetals do not fracture?
- Q A solution contains 12.00 g of unknown compound(non-electrolyte) dissolved in 50.0 mL of water. (Assume a densityof 1.00 g/mL for water.) The freezing point of the solution is-4.95 ∘C. The...
- Q If I want to make 12 g of XeO2 from the elements, how much Xe doI need, in grams
- Q What percentage reduction in carbon emissions do thefollowing natural gas-fired CHP systems provide compared to thespecified separately generated electricity and heat systems? Forcarbon emissions, assume natural gas emits 53 g...
- Q At 650 K, the reactionMgCO3(s)<->MgO(s)+CO2(g) hasKp=0.026. A 10.1L container at 650 K has 1.0g ofMgO(s) and CO2 at P = 0.0260 atm. The containeris then compressed to a volume of0.500L...
- Q The parameter g varies with temperature for molecular gasesbecause of the varying contributions from molecular vibrations.Determine g in the low-temperature and the high- temperature limitsfor (a) CO2 (g) and (b)...
- Q Isdensity by calculation more accurate than density by immersion, whyor why not?
- Q a) If 42.1 mL of 1.02 M sodium hydroxide, measured using agraduated cylinder, is placed in a beaker filled with 300 mL of DIwater, what is the concentration of the...
- Q What is the equilibrium concentration of PO4 in a 0.511 M solutionof H3PO4 (Ka1 = 7.5E-3, ka2= 6.2E-8, ka3= 4.8E-13) I troes usingthe 5% rule but when i checked my...
- Q To convert from a given quantity of one reactant or product tothe quantity of another reactant or product:First, convert the given quantity to moles. Use molar masses toconvert masses to...
- Q Ethane (CH3CH3) andFluoromethane (CH3F) have the same number of electrons and areessentially the same size. However, ethane has a boiling point of184.5C and fluoromethane has a boiling point of 194.7C....
- Q 15- Propane gas flows into a combustion chamber at a rate 250L/min at 2.0 atmand ambient temperature. Air is added to thechamber at 1.0 atm and the same temperature. The...
- Q What is the pH of the buffer that results when 0.235 mol of NH3and (2.46x10^-1) mol of NH4Cl are dissolved in water to a volume of0.50 L? (Ka of NH4(+)...
- Q Why is there more than one definition of acid-base behavior?Which definition is the right one?
- Q 8.0g of aluminum at 200?C and 21g of copper are dropped into45cm3 of ethyl alcohol at 15?C . The temperature quickly comes to27?C.What was the initial temperature of the copper?
- Q When a 0.860 g sample of an organic compound containing C, H,and O was burned completely in oxygen, 1.64 g of CO2 and1.01 g of H2O were produced. What is...
- Q Complete and balance the precipitation reactions. Includephysical states in your equations. Click here for solubilityrules.A.) AgNO3(aq)+NaCl(aq)----->B.) K3PO4(aq)+MgCl2(aq)----->
- Q For each of the following pairs of aqueous solutions (all are at300 K, unless otherwise stated), circle the one that has a higherconcentration of solute:1. 1.75 M NaCl or 1.75...
- Q A volume of 84 mL of 0.060 M NaF is mixed with 28 mL of .15 MSr(NO3)2. Calculate the concentrations of the following ions in thefinal solution (Ksp for SrF2...
- Q 2C2H2(g) +5O2(g) --->4CO2(g) +2H2O(l)A. Write the standard enthalpy of formation equations for thosethat apply:B. Manipulate these equations and calculate the enthalpy ofreaction:C. Use the enthalpy of reaction equation and the...
- Q #1. Estimate ΔH for the reaction using bond dissociationenergies. Give your answer in kcal. C6H12O6 has five C−C bonds,seven C−H bonds, seven C−O bonds, and five O−H bonds.#2. Is the...
- Q Consider the titration of a weak base (B- ) with a strong acid(HCl). Draw (this can be hand drawn) a pH (not pOH) vs mL HCl graph(it will not look...
- Q Constant boiling HCl has a concentration of 11.6 M. Yourlaboratory assistant is going to dilute this acid for you to createa stock solution of HCl for you to use in...
- Q A layer of peat beneath the glacial sediments of the last iceage had a carbon-14 content of 25 % of that found in livingorganisms. How long ago was this ice...
- Q Different manufacturers claim to have the best antacid. Which ofthe following tablets would neutralize the most acid for themoney?A. Rolaids (550 mg CaCO3 and 110 mg Mg(OH)2 per tablet) –...
- Q What are the three basic types of solids and the composite unitsof each? What types of forces hold each type of solid together?
- Q Air. Write in reasonable detail, using the macroscopic nature(our experience) and microscopic nature (molecular level) thecomposition of air, pollutants in air, where pollutants come from,how they impact health and environment,...
- Q At 25 C, you conduct a titration of 15.00 mL of a 0.0400 M AgNO3solution with a 0.0200 M NaI solution within the followingcell:Saturated Calomel Electrode || Titration Solution |...
- Q What is the half-life (T1/2) of a radioactive element with thefollowing conditions?-Initial Activity = 1000 milliCuries-Final Activity = 400 milliCuries-Elapsed Time= 20.0 days
- Q Why can Hydrogen and helium only hold two electrons in therevalence shell, but Neon can hold 8?(You will receive extra creditif you can explain this with quantum numbers)
- Q i keep getting 1 wrong.. its says the total V is hcland water added together but i did it and its not right. thanks1. You add Hydrochloric Acid to distilled...
- Q Please show how you got the answers so that I can learn how todo this!200.00mL of 2.00 M solution of a weak acid is mixed with 300.00mL of a 2.00...
- Q A solution is made containing 48.7g of methanol (CH3OH) in433.3g of water (H2O). What is the mole fraction of water? What isthe mass percent of methanol? What is the molality...
- Q Acodofocation of sodium bicarbonate(NaHCO3) producescarbon dioxide in a two-step process. The first step producescarbonic acid (H2CO3). Write and balance themolecular equation for the first step of the reaction of sodiumbicarbonate...
- Q Three bulbs are connected by tubing, and the tubing isevacuated. The volume of the tubing is 40.0 mL. The first bulb hasa volume of 72.0 mL and contains 6.00 atm...
- Q Flag this QuestionQuestion 1 1 ptsCalculate the molarity of 2.45 mol CaCl2 in 0.3 Lsolution.8.16 M0.735 M0.122 M5.42 MFlag this QuestionQuestion 2 1 ptsWhat are the products of this acid-base...
- Q Write the balanced chemical equation for Dodecane andair in terms of major stable species with the fuel to air ratio f/a= .03.Calculate the molecular weight of the product mixture.For a...
- Q Match the pollutants on the left with effects or othersignificant aspects on the right:PollutantsEffects or Other Significant AspectsA. Salinity1. Excessive productivityB. Alkalinity2. Can enter water from pyrite or from the...
- Q What mass of nitrogen is needed to fill an 855 L tank atSTP?
- Q Arsenious acid is a weak acid:HAsO2<->H++AsO2- pKa=9.22If 10-3 moles of the herbicide NaAsO2 areadded to 1 liter of water at 25 degrees Celsius, what is theresulting pH? Determine your answer...
- Q How many grams of silver chloride can be prepared by thereaction of 107.0 mL of 0.21 M silver nitrate with 107.0 mL of 0.14M calcium chloride?Calculate the concentrations of each...
- Q For the reaction2Co3+(aq)+2Cl−(aq)→2Co2+(aq)+Cl2(g).  E∘=0.71Vwhat is the cell potential at 25 ∘C if the concentrations are[Co3+]= 0.634 M , [Co2+]= 0.385 M , and [Cl−]=0.491 M and the pressure of Cl2 is...
- Q For the reactionA + B + C → DThe following data were obtained at constant temperature:TrialInitial [A] (mol/L)Initial [B] (mol/L)Initial [C] (mol/L)Initial Rate (mol/L . s)10.27900.16700.03341.19020.55800.16700.03342.38130.55800.33400.03349.52440.27900.16700.06681.1901. What is the order...
- Q 1)Draw the mechanism and product of: basic hydrolysis ofpropanenitrile.2) Tylenol (acetaminophen) has a much longer shelf life thanaspirin. Explain.
- Q please read the material underneath is not clear to me how toaproach this am not a chem major so its kind of hard. thanks forthe helpIn Part I, when the...
- Q Exercise 15.82For each of the following strong base solutions, determine[OH−],[H3O+], pH, andpOH.Part A8.74×10−3 M LiOHExpress your answer using three significant figures. Enter youranswers numerically separated by commas.[OH−],[H3O+] =Part BExpress your...
- Q Please Show working for the following clearly4.) Barium hydroxide is reacted with calcium iodide. Calculatehow many mL of .30M Ba (OH)2 needed to react with 250mL of .50MCal2 (Write balanced...
- Q What is the significance of the Fermi wavelength in terms of theoptical property of the nanomaterial?
- Q Imagine that a polluter starts dumping sodium chloride into LakeCharles at a rate of 1413.7 kg per day, that the backgroundconcentration of NaCl in the lake was 8.3 ppm, and...
- Q Describe and explain the bonding (sigma and/or pi interactions)in Fe(NO)2(CO)2
- Q the following equilibrium reaction occurs in aqueous solutionswhen 0.1 M KSCN is mixed with 0.1 MFe(NO3)3. Fe(SCN)2+(aq) <----> Fe3+(aq) + SCN-(aq)Predict whether the following statements (in relation to theabove equilibrium...
- Q Glucose Metabolism can be represented by the following chemicalreaction:C6H12o^(aq) + 6 02 (g) -------------- 6C02 (g) + 6 H20 (i)H for the reaction is -2837 kj/mole.A: Is this reaction endothermic...
- Q The sequence of a polypeptide X is as follows:THCARKEDSGYPEWANVRDECW1. The Optical Density (O.D.) at 280 nm of a solution of the abovepolypeptide X is 0.51 at the standard experimental conditions...
- Q How many grams of glucose,C6H12O6, must be dissolved into394.7 g of water at 100°C to reduce the pressure of water above thesolution to 686.4 mm Hg? The solute is a...
- Q Calculate the enthalpy of the reaction 2NO(g)+O2(g)→2NO2(g)given the following reactions and enthalpies of formation:12N2(g)+O2(g)→NO2(g), ΔH∘A=33.2 kJ 12N2(g)+12O2(g)→NO(g), ΔH∘B=90.2kJ
- Q A. Draw a seperatory funnel withisopropyl acetate and aqueous solution in it. Label the layers.Which is the top and which is the bottom and why is this so? Whatproperty of...
- Q Why is it possible for more than one mechanism to be consistentwith the experimentally determined rate law for a hemicalreaction?
- Q A 10.0 mL solution of 0.030 M AgNO3 was titrated with 0.015 MNaBr in the cell. S.C.E. || titration solution | Ag(s) Find thecell voltage for 0.4, 10.0, 20.0, and...
- Q A 35.0-mL sample of 0.150 M acetic acid (CH3COOH) istitrated with 0.150 MNaOH solution. Calculate the pH afterthe following volumes of base have been addePart A35.5 mLExpress your answer using...
- Q A solution is prepared by dissolving 32.5 g of a nonvolatilesolute in 200 g of water. The vapor pressure above the solution is21.85 Torr and the vapor pressure of pure...
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