Chemistry question and answers for September 12, 2023
- Q A bomb calorimeter, or constant volume calorimeter, is a deviceoften used to determine the heat of combustion of fuels and theenergy content of foods. Since the \"bomb\" itself can absorb...
- Q Aluminum reacts with hydrochloric acid, but copper does notreact with the acid. When a mixture of aluminum and copper having amass of 0.3579 grams is combined with excess hydrochloric acid,315.50...
- Q types of field oxides and their comparisons
- Q What is Taq Polymerase and why should it be used?
- Q A standard SCUBA diving tank holds 10.9 L of compressed air at204.1 atm. a. What are the mole fractions of N2 (Tc = 126.20K andPc = 33.5 atm) and O2...
- Q Explain the difference between class and individualcharacteristics. What class and individual characteristics would anexaminer look for in fingerprints? Bullets/cartridge casings? andfootwear impressions?
- Q Consider a 1.0 L buffer containing 0.083 mol L-1HCOOH and 0.095 mol L-1 HCOO-. What is the pHof the solution after adding 6.0 x 10-3 mol of NaOH?Express your answer...
- Q 2.0 mL of 0.5M HCl was added to 50 mL of 0.5M Formate-formicacid buffer at pH 3.6. (pKa= 3.75) What is the resulting pH afterthe addition of HCl?2.0 mL of...
- Q An aqueous polymer solution has a relative viscosity of 1.375at 25 Celsius. What is the absolute viscosity of the solution? Whatis the specific viscosity of the solution?If the intrinsic viscosity...
- Q . Assuming a single hydrogen bond contributes ΔG ≈ -0.9kcal/mol, calculate the contribution of the R38 hydrogen bonds tothe IL2/IL2Rα binding free energy.A)     -2.7 kcal/molB)     -0.9 kcal/molC)     -1.8 kcal/molD)     -3.6...
- Q pH of acetic acid solutions. Remember, aceticacid is a weak acid, with a Ka = 1.8 x 10−5.Obtain 10.0 mL of 0.10 M acetic acid and place in a clean...
- Q The temperature of 500 mL of distilled water in a flask isbetween 70°C and 90°C. Room temperature is 20°C. the useful rangeof the only thermometer available is between 0°C and...
- Q Is it impossible to overdose on Vitamin C? Please explain. Sitereferences.
- Q 1. List the proper GLP involve in the handling of aburet.2. What is the tolerance of a 25mL & 50mL buret?3. Briefly explain, what a Least Squares Analysis.  4. According to...
- Q Titration of a 15.0 mL solution of KOH requires 17.0 mL of0.0250 M H2SO4 solution.What is the molarity of the KOH solution?M=?
- Q Nitrogen and oxygen do not react appreciably at roomtemperature, as illustrated by our atmosphere. But at hightemperatures, the reaction below can proceed to a measurableextent. N2(g) + O2(g) ⇔ 2...
- Q Calculate the PH after the addition of 0.00, 5.00, 15.00, 25.00,40.00, 45.00,49.00, 50.00, 51.00, 55.00 and 60mL of 0.100M HCl inthe tirtration of 50.00mL of 0.100M weak Monoprotic base B....
- Q pick one of the transition element and talk about the element'sphysical, chemical properties, preparation, discovery, andindustrial application of that element
- Q How does NMR allow us to understand the connection between bondrotation and the kinetic energy within the sample beinganalyzed?Background info: in this lab DEET orN,N-diethyl-m-toluamide is synthesized using theSchotten-Baumann synthetic...
- Q You have been given the basic connectivity of two boroncompounds. Complete the Lewis structures by adding lone pairsand/or multiple bonds where necessary. If there is more than onepossible structure, draw...
- Q Determine the volume (in mL) of 0.442 M potassium hydroxide(KOH) that must be added to 475 mL of 0.0992 M ascorbic acid(C5H7O4COOH) to yield a pH of3.89.Assume the 5% approximation...
- Q 1. What is the total number of electrons that occupy a shell,n?2. List the relative energies for the different subshells.3. What are the relative energies of orbitals within ashell?4. How...
- Q How could you use gas chromatography analysis to confirm theidentify of your product?
- Q You have solid calcium carbonate and inorganic carbon inequilibrium in a lake at pH 7. Use equilibrium calculations to showthat due to this equilibrium the calcium concentration is ~0.5mM.
- Q I have a couple of pre lab questions regardingN-phenylmaleimide.1) why it is necessary to prevent N-phenylmaleimide fromoverheating when recrystallizing???2) what would be the precautions, in terms of reagents, to betaken...
- Q Write the balanced overall reaction from these unbalancedhalf-reactions
- Q A 5.00 g sample of H2O is removed from a freezer and heated froman initial temperature of -5.00 oC through to a final temperatureof 102.0 oC.(a) Given the following data,...
- Q draw the hybrid structure of the cyclopentadienyl anion thatligates to the iron in ferrocene and acetylferrocene. draw three ofthe possible five resonance structures which aid chemists inunderstanding the distribution of...
- Q Phathalic acid, H2C8H4O4, is a diprotic acid and has aconcentration of 2.9 M. Ka1 = 0.0012 and Ka2 = 3.9 x 10-6. Estimatethe concentration of [HC8H4O4-] and [C8H4O4-2] at equilibrium.Determine...
- Q Intercations between residues on seperate polypeptide chains wouldbe best classified as:A) PrimaryB) SecondaryC) QuaternaryD) GlobalE) Tertiary
- Q Ascorbic acid (vitamin C, C6H8O6) is a water-soluble vitamin. Asolution containing 81.0 g of ascorbic acid dissolved in 220 g ofwater has a density of 1.22 g/mL at 55 ∘C.Calculate...
- Q Determine the pH of an HF solution of each of the followingconcentrations. In which cases can you not make the simplifyingassumption that x is small? (Ka for HF is 6.8×10−4.)a)...
- Q 1. Calculate the pH of the following solutions.a. A solution containing 0.100 M KH2PO4 and 0.200 M K2HPO4b. A solution prepared by mixing 100.0 mL 0.100 M H3PO4 with50.0 mL...
- Q 1.)A.) Convert 1.35 ✕ 102 grams to milligrams. Enter your answerusing standard scientific or \"e\" notation and the correct number ofsignificant figures (for example, 105 = 1.05e2).B.) How many grams...
- Q Use resonance structures to show how and why the hydroxyl groupdirects incoming electrophiles in phenol.
- Q Calculate the Kovats retention index for an unknown using thefollowing retention times: 1.2 min for CH4, 11.4 min for octane,16.0 min for the unknown, and 17.1 min for nonane
- Q 1) What is the pH at the equivalence point in the titration of a21.9 mL sample of a 0.456 Maqueous hypochlorous acid solution with a0.494 M aqueous potassiumhydroxide solution?pH =2)...
- Q *Solve the question with arbitrary number* Thank you!1.a. Each milliliter of an otic solution (Auralgan) contains thefollowing ingredients. Calculate the amount of benzocaine requiredto manufacture (a given #) 12 mL...
- Q Material Science- Corrosion is one of the processes that affectsthe reliability of all engineering components. It is verycomplicated process and many factors are affecting it. However,when it comes to the...
- Q 1.Why are there two different values for R?(R = 8.314472JK-1mol-1 = 0.0820574 L atm K-1mol-12.Why are liquid barometers filled with mercuryrather than water?3. Using the concepts of the kinetic theory...
- Q Solid NaI is slowly added to a solution that is 0.0083M Cu+ and 0.0091 MAg+.Which compound will begin to precipitate first?Calculate [Ag+] when CuI just begins to precipitate.Enter your answer...
- Q a. What is the molar solublity of lead(II) chloride inwater?b. Should we be concerned about the chloride ion acting as abase? Why or why not?
- Q Why is it necessary for scientists to understand chemicalreaction rates?
- Q Please answer all numerically with three demical places. :)A) What is the pH of a buffer prepared by adding 0.405 mol ofthe weak acid HA to 0.609 mol of NaA...
- Q is it possible to convert NO to N2O in our atmosphere? Explainwhy or why not
- Q A student mixes 50.0 mL of 1.00 M Ba(OH)2with 81.2 mL of 0.450 M H2SO4.Calculate the mass of BaSO4 formed.Calculate the pH of the mixed solution.
- Q When trying to purify fluorene, why does a NaOH extraction workbest with Benzoic Acid, succinimide, and fluorenone but a HClextraction works best with ethyl-4-aminobenzoate? Also, draw theacid/base reaction for each...
- Q 340.0Â Â gallons of 15.0 M nitric acid wereadded to a lake. The initial pH of the lake was 6.40 and the finalpH was 4.50 . If none of the acid was...
- Q 1.Please describe how hybridization tells you about chemicalstructures? What is a good rule of thumb about where groups arearranged around any central atom? Provide a reaction mechanism(i.e. movement of electrons...
- Q The pH change around the equivalence point forstrong-base/weak-acid titration is usually not as great as that forstrong-base/strong-acid. The statement is true or not. Explain.
- Q What is the percent yield of dibenzalacetone when 0.212 g ofbenzaldehyde and 0.058 g of acetone was used in the experiment? Igot a 0.885 g of product in the end.
- Q Show an organic reaction mechanism which relies on bond polarityin order to occur. How does electronegativity participate in thisreaction.
- Q Giventhat the Ksp for Magnesium Hydroxide is 1.2 x 10-11 . calculate thesolubility of this compound in grams per 100 mL of solution.
- Q For each of the following pairs of molecules, identify thedominate intermolecular force, and answer any associatedquestions.a. KNO2, CH3NO2Which compound do you expect to have the highest meltingpoint?b. CH3CH2OH, CH3OCH3Which compound...
- Q Consider the titration of a 26.0-mL sample of 0.180 M CH3NH2with 0.145 M HBr. (The value of Kb for CH3NH2 is4.4×10−4.)Already found:volume of added acid required to reach the equivalencepoint.=32.3...
- Q The equilibrium vapor pressure of mercury at roomtemperature is about 1.6x10-6 atm. Imagine an old chemistry labthat over the years has experienced enough liquid mercury spillsand thereby accumulated enough mercury...
- Q If250 ml of a .1M NaOH solution is added to 500 ml of a .2M HCLsolution. What is the pH of the resulting solution?
- Q Draw products for the following addition reactions:Hydrogenation (H2 / Pt)Halogenation (X2)Hydrohalogenation (HX)Hydration (H2O, H+)
- Q 1a. What happens to the pressure of an ideal gas if you doubleits temperature in a closed volume? And what happens to thepressure of an ideal gas if you double...
- Q Which of the following produces the most stable carbocation?allyl bromide2-bromo-2-methylpropanebromobenzenebenzyl bromide
- Q Walter White who lives in Simeranya (a utopic city in Anarres)prepares blue crystals, named as m...Walter White who lives in Simeranya (a utopic city in Anarres)prepares blue crystals, named as...
- Q Q1) The interior lighting of refrigerator is provided byincandescent lamps whose switches are actuated by the opening ofthe refrigerator door. Consider a refrigerator whose 50 W lightbulb remains switched on...
- Q Photochemical isomerization of Alkene:cis-1,2-dibenzoylethylene6-38: What are some clues that tell you that you have made adifferent isomer product in this reaction?6-39: Suggest a reason why the starting material(trans-1,4-diphenyl-2-butene-1,4-dione) should be...
- Q Calculate the pH of the solution after the addition of thefollowing amounts of 0.0568 M HNO3 to a 80.0 mL solution of 0.0750M aziridine. The pKa of aziridinium is 8.04.a)...
- Q Consider the titration of 80.0 mL of 0.0200 M C5H5N (a weakbase; Kb = 1.70e-09) with 0.100 M HNO3.Calculate the pH after the following volumes of titrant havebeen added:(a) 0.0...
- Q A sample of gas contains 4.44 moles of oxygen, 1.35 moles ofnitrogen, and 1.13 moles of carbon dioxide. If the total pressureis 4.14 atm, what is the partial pressure of...
- Q Calculate the number of grams of sodium in 8.3 gg of each of thefollowing sodium-containing food additives.NaClNaCl (table salt)Na3PO4Na3PO4 (sodium phosphate)NaC7H5O2NaC7H5O2 (sodium benzoate)Na2C6H6O7Na2C6H6O7 (sodium hydrogen citrate).
- Q Into a 67.2L container containing O2 (g) at STP isadded 32.0g CH4(g); the container is sealed and themixture is combused. Assuming that all reactants and productsremain as gases, waht will...
- Q Carbon disulfide is prepared by heating sulfur and charcoal. Thechemical equation isS2(g)+C(s)−⇀↽−CS2(g)Kc=9.40 at 900 KS2(g)+C(s)↽−−⇀CS2(g)Kc=9.40at 900 KHow many grams of CS2(g)CS2(g) can be prepared by heating 16.5mol S2(g)16.5 mol S2(g)...
- Q Consider a concentration cell. Two Ag-electrodes are immersed inAgNO3 solutions of different concentrations. When the twocompartments have an AgNO3-concentration of 1 M and 0.1 M,respectively, the measured voltage is 0.065...
- Q Carbon dioxide dissociates to form carbon monoxide.a. Write down the balanced stoichiometric equation representingthe complete dissociation of CO2 to COb. determine the equilibrium constant for this reaction at 2000Kc. Write...
- Q Explain how amino acid structure depends on side chains andpH
- Q State two major differences between sequential reactions anddouble-displacement multi-substrate reactions.
- Q You are titrating 50 ml. of nitrous acid with sodium hydroxide(0.15 M). Equivalence is reached at 22.0 ml of NaOH delivered.Calculate the pH of the solution in the flask: -...
- Q 1. Electrolytic reactions, like other chemical reactions, arenot 100% efficient. In a copper purification apparatus depositingCu from a CuSO4 solution, operation for 5.47 hours at a constantcurrent of 5.45 A...
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