Chemistry question and answers for July 11, 2023
- Q In a tropical country, it is desired to provide processing airconditions of 15°C and 80% RH. The ambient air is at 31.5°C and 90%RH. If the chosen method is to...
- Q The extinction coefficients of the four naturalnucleoside-5’monophosphates pdA, pdG, pdC and pdT at 260 nm are1.506*104 , 1.218*104 , 7.10*103 ,and 8.56*103 L/mol/cm, respectively (Cavaluzzi, M.J.,Nucleic Acids Res., 2004, 32,...
- Q What would be the appropriate equilibrium temperature of asystem obtained by adding 25.0 g of ice at 0°C to 250.0 mL of \"hot\"(80°C) coffee, assuming that the heat capacity and...
- Q How much heat (in kJ) is required to warm 11.0 g of ice,initially at -10.0 ∘C, to steam at 112.0 ∘C? The heat capacity ofice is 2.09 J/g⋅∘C and that...
- Q Please i am writing up a practical report for the ;Reduction ofbenzophenone to corresponding alcohol(diphenylmethanol)using sodiumborohydride,and the need the following;1.Please state possible observations you are likely to get fromthese experiment2.State...
- Q A solution was prepared by dissolving 0.1937 g of HgO (table) in20 mL of water containing 4 g of KBr. Titration with HCl required17.98 mL to reach a phenolphthalein endpoint....
- Q Howdoes an amino acid side chain hydrogen bond with RNA?Which residues are most likely to hydrogen bond?Which residues are most likely to be in the hydrophobiccore?
- Q Density of plasticYour challenge in this experiment is to determine the density ofa mystery plastic, using two different step-by-step procedures. Forsufficient error analysis, each method should be completed at leasttwice...
- Q Calculate the pH for each of the following cases in thetitration of 50.0 mL of 0.240 M HClO(aq) with 0.240 M KOH(aq).The ionization constant for HClO can be found here.https://sites.google.com/site/chempendix/ionization(a)...
- Q 1- How far you can go in a car in 1 1/2 hours if you aretravelling at 60 miles per hour?2- How much acetic acid, CH3COOH(MWou 60.06 G/MOL) should youweight...
- Q At 1 atm, how much energy is required to heat 47.0 g of H2O(s)at –22.0 °C to H2O(g) at 119.0 °C?
- Q Part IA) The solubility of silver bromide can be increased by dissolvingit in a solution containing the thiosulfate anion.AgBr(s) Ag+ (aq) + Br-(aq)Â Â Â K1 = 7.7 x 10-13Ag+(aq) + 2S2O32-...
- Q A derivative of the polysaccharide chitosan is being utilized ina spray to treat severe wounds. The chitosan aids in quicklystopping the flow of blood by forming a gel at the...
- Q when a mixture of 10.0g of acetylene, C2H2 and 10.0g of oxgyen,O2 is ignited the resulant combustion reaction procedures CO2 andH2O2C2H2 + SO2= 4Co2 + 2H2Owhat is limiting reactant?what is...
- Q The final volume of buffer solution must be 100.00 mL and thefinal concentration of the weak acid must be 0.100 M. Based on thisinformation, what mass of solid conjugate base...
- Q An aqueous solution is 0.10 M in Na2SO4and also 0.15 M in KBr.(a) What is the ionic strength of the mixture?(b) Which salt makes a greater contribution to the ionicstrength?...
- Q I'm confused when I can use Henderson equation for pHcalculation? it seems my professor use it for both calculating ph oftitration and for buffer solution too. but can I use...
- Q For the diprotic weak acid H2A, Ka1 = 2.8 × 10-6 and Ka2 = 8.7 ×10-9. What is the pH of a 0.0500 M solution of H2A? What are theequilibrium...
- Q In a 100.0 mL sample of a different buffer solution, thepropanoic acid solution is 0.350 M and the propanoate concentrationis 0.809 M. 0.00400 moles of solid KOH are added to...
- Q Cu(s)+HNo3(aq)- Cu(NO3)2(aq)+NO2(g)+H2O 1. which chemicalspecies is the limiting reaggent? 2.which chemical spcies is thenon-limiting reagent? 3.Theoretical Volume amount of nitric acidneeded used. 4Experimental Volume amount of nitc acid used.5.Experimental Volume...
- Q Calculate the percent ionization and the expected intial pH forthe 0.10 M acetic acid solution
- Q Aluminum reacts with chlorine gas to form aluminum chloride viathe following reaction:2Al(s)+3Cl2(g)→2AlCl3(s)What is the maximum mass of aluminum chloride that can be formedwhen reacting 26.0 g of aluminum with 31.0...
- Q The following reactions can be coupled to give alanine andoxaloacetate: glutamate + pyruvate ↔ ketoglutarate + alanine ∆Go’rxn,303 = − 1004 J/mol glutamate + oxaloacetate ↔ ketoglutarate +aspartate ∆Go ’rxn,303...
- Q a) For a particular redox reaction BrO- is oxidized to BrO3- andFe3+ is reduced to Fe2+. Complete ad balance the equation for thisreaction.BrO- +Fe3+ => BrO3- +Fe2+B) Rank the species...
- Q Consider two interconnected tanks. Tank 1 initial contains 40 L(liters) of water and 160 g of salt, while tank 2 initiallycontains 20 L of water and 250 g of salt....
- Q Create and energy diagram for these 8 Bohr energy levels. Usingthe Bohr equation (E=-2.18X10^-18 J (1/n^2) for any of the energyof any level in a hydrogen atom. Calculate the energy...
- Q A) write the correct charge balance equation for a solutioncontaining 0.2 M AlPO4 and 0.1 M BaCl2B) write the correct mass balance relationship for CH3CO2Na
- Q 1a. The pi bond in benzene reacts with a ____ to form a ____intermediate. This intermediate undergoes a ___ reaction to formthe substituted benzene. nucleophile electrophile radicalcarbocation carbanion substitution elimination...
- Q Quantum numbers arise naturally from the mathematics used todescribe the possible states of an electron in an atom. The fourquantum numbers, the principal quantum number (n), the angularmomentum quantum number...
- Q Indicate which of the following statements are true regardingfats.Question options: (all that apply)In a fat the three carboxylic acid moieties have to beidentical.A fat containing unsaturated fatty acids will have...
- Q If the pressure of O2 in a 1.0-L container at 20 degrees Celsiusis 0.37 atm, what will be the pressure on the container if 0.10 molCO2 is added to it?
- Q What is the overall order of the reaction below2 NO(g) + O2(g) → 2NO2(g)if it proceeds via the following rate expression?a)zero-order         b)first-order         c) second-order    d)third-order       e)fourth-order
- Q Inthe reaction between acetic acid and salicylic acid for theformation of the ester, why is acetic anhydride used instead ofacetic acid to attach this group?
- Q At 1.00 atm pressure and 273 K one mole of gas should occupy22.4 L. What volume would one mole of gas occupy at 21oC and 1.00 atm?In the Molar Mass...
- Q A.) Ammonium bisulfide, NH4HS, forms ammonia, NH3, and hydrogensulfide, H2S, through the reactionNH4HS(s)⇌NH3(g)+H2S(g)1.)This reaction has a Kp value of 0.120 at 25 ∘C.What is the initial pressure of H2S(g) in...
- Q Do you think that the light that reaches the detector should beless than, the same, or more than the light that enters the sample?Explain your answer.
- Q Please draw the cooling curve at standard pressure forbenzene, C6H6 (MM = 78.01 g/mol). The normalfreezing point of benzene is 5.00 oC, and the normalboiling point is 80.2 oC. Calculate...
- Q Two liquid streams of carbon tetrachloride are to be evaporatedto produce a vapor at 200 C and 1 atm. If the first feed stream isat 1 atm and 30 C...
- Q 15 mol /h of stream 1 (gas, at 1.1 atm and 0°C) containing 25%(mol basis) propane and rest butane is mixed with a second stream(gas, at 1.1 atm and 70°C)...
- Q What is the ph of 0.10 MCa(C3H5O3)2?
- Q For each strong base solution, determine [H3O+], [OH−], pH, andpOH. in part A,B,and CA.) 8.78×10−3 M LiOH Express your answer using three significantfigures. Enter your answers numerically separated by a...
- Q A beaker with 195 mL of an acetic acid buffer with a pH of 5.000is sitting on a benchtop. The total molarity of acid and conjugatebase in this buffer is...
- Q Discussion: 1. Prepare a graph of %volume condensed vs.temperature. 2. Explain the characteristic properties of matterthat the process of distillation relies upon. Why and how does thisprocess work? 3. In...
- Q Part A) The density of a sample of N2O gas is 3.00 g/L at 298K.What is the pressure of the gas (in mmHg)?Part B) An experiment shows thata 110 mL...
- Q Calculate the molality for each of the following solutions.Then, calculate the freezing-point depression?TF =KFcmproduced by each of the salts. (Assume the density of water is1.00 g/mL andKF = 1.86
- Q Part AA common way to make hydrogen gas in the laboratory is to placea metal such as zinc in hydrochloric acid (see the figure). Thehydrochloric acid reacts with the metal...
- Q In open tube CE a) How does chiral analysis work and with whatadditives? b) explain with detail why use coated capillaries? c)explain with detail why open tube CE shows high...
- Q Phosphorous acid, H3PO3(aq), is a diprotic oxyacid that is animportant compound in industry and agriculture pka1=1.3 pka2=6.70Calculate the pH for each of the following points in the titrationof 50.0 mL...
- Q In CE utilizing photometric (UV) detection, it is often found tobe difficult because of inadequate detector sensitivity.a) why is UV detection of low sensitivity?b) list all remedy(s) that can be...
- Q In capillary gel electrochromatography. a) what is the source ofsolute movement through the capillary? b) what drawbacks does thistechnique have? c) what are the advantages of this technique?
- Q (For first 4 questions) A sample of argon gas has a volume of755 mL at a pressure of 1.32 atm and a temperature of 130 ∘C.(1) What is the volume...
- Q Classify each of the following reactions as one of these fourtypes:• spontaneous at all temperatures• not spontaneous at any temperature• spontaneous below a certain temperature but not above• spontaneous above...
- Q The value of Km for the shown data for ahexokinase-catalyzed reaction is [Blank] with theunit of [Blank] The value of Vmax forthe same reaction is [Blank] with the unit of[Blank]...
- Q Consider a different titration for this exercise. Potassiumpermanganate (KMnO4) is the titrant and hydrogen peroxide (H2O2)the analyte according to the following balanced chemical equation.2 MnO4− + 5 H2O2 + 6...
- Q Theaccepted value for the ionization constant of acetic acid is1.76x10^-5. Using this figure, calculate the H+ concentration of0.70?M HOAc.
- Q whycan you not always accurately determine position of layer bychecking density of water and organic compound?
- Q A propane burning engine is being evaluated and the exhaust gascollected on a dry basis is 10.1% CO2, 1.1% CO, 4.7% O2 and 84.1%N2. During the test, 0.50 kg of...
- Q 2Fe2O3(s)+3 CO2(g)+4 Fe(s)A) if 2.70 g of Fe2O and 4.05 of carbon react, what mass ofiron is expected to form?B) what was the limiting reactant?C) How much excess reagent (in...
- Q Propose, how to obtain the following compounds, starting frombenzene, and using a sequence of electrophilic aromaticsubstitution reactions (be careful about directing effect ofsubstituents).m- bromoacetophenone, 3-bromo-4-tert butyl nitrobenzene
- Q Develop an analysis scheme that would allow you to take a solutionthat was said to contain any or all of Ag+,Ba2+,Co2+,Pb2+, and Zn2+cations and would confirm or deny the presence...
- Q .247 grams maleic acid (molecular weight 144.13 g/mol)was mixed with .25 mL HCl, .07 grams of crystals resulted - whichshoud be fumaric acid.1. Was the major product cis or transisomer?2....
- Q Given four beakers labeled A, B, C, and D.Add 40 mL of distilled water to beakers A and C.Add 40 mL of the prepared sodium acetate/acetic acid buffersolution to both...
- Q Combustion analysis of a 13.42-g sample of the unknownorganic compound (which contains only carbon, hydrogen, and oxygen)produced 39.61 g CO2 and 9.01 g H2O. The molar mass of equilin is268.34...
- Q summarize the causes and ramifications of the gel( Trommsdorffor Norris-Smith) effect
- Q N2 + H2 <=> 2NH3 Given inpart A: Kp = 1.64x10-4 at 673K and they asked what isthe Kc value, I got 5.38x10-8.Now they are asking in Part B, qith...
- Q After diluting 30 ml of 0.100M NH4OH(Kb=1.75x10-5) to100 ml, the solution is titrated with 0.100 M HCl. Calculate the pHvalue of the solution: a) at the start of the titration...
- Q If 550 ml of some Pb(NO3)2 solution is mixed with 500 ml of 1.30x 10-2 M NaCl solution, what is the maximum concentration of thePb(NO3)2 solution added if no solid...
- Q CxHy completely combusted to produce 344 mg carbon dioxide and56.2 mg of water. What is its empirical formula?
- Q 1.An inorganic base dissociates in water into?a)one or more hydrogen ions and one or more anions b)one or morehydroxide ions and one or more reactions c)one or more hydrogenions and...
- Q You mix 25.0ml of 6.0m LiOH with 75.0ml of MgSO4. Magnesiumhydroxide precipitates from the solution.A. Write a balanced equation for the reaction.B. What concentration of MgSO4 is required to react...
- Q Ion-Exchange Column:You condition the column with 6 M HCl. Before you transfer theunknown to the ion-exchange column you need to wash the columnuntil pH is above 6. Why?
- Q Phosgene (COCl2) is a very toxic molecule that was used as achemical weapon in World War I. It can also be a precursor tochemicals used to make closed-cell polyurethane insulation,...
- Q Composition of Solution for Determing kTest Tube0.0025 M Fe(NO3)30.0025 M KSCN0.10 M HNO3Results of SpectroAbsorbance61.0 ml1.0 ml5.0 ml--->.10971.0 ml1.5 ml4.5 ml.18381.0 ml2.0 ml4.0 ml.27891.0 ml2.5 ml3.5 ml.295101.0 ml3.0 ml3.0 ml.337Test...
- Q calculate the equilibrium pressure of CO2 in a closed 1 L vesselthat contains each of the following samples. Assume that ΔH∘ andΔS∘ are independent of temperature:15 g of MgCO3 and...
- Q Observing chemical reactions. Bolded reactions indicate thesolution made in previous stepFor the reactions listed below, provide the following:-product formed from the reaction-evidence that a chemical change occurred-eg. Color change, temperature...
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!