Chemistry question and answers for August 14, 2023
- Q What is the differnce between linear synthesis and convergentsynthesis? Why is convergent synthesis in general favored overlinear synthesis and When would linear synthesis be used?
- Q A mixture of 0.2063 mol of Cl2, 0.2093 mol of H2O, 0.1887 mol ofHCl, and 0.09871 mol of O2 is placed in a 1.0-L steel pressurevessel at 575 K. The...
- Q A piece of magnesium can be attached to the iron hull of a boatto prevent it from rusting.Why is the magnesium called a sacrificial metal?How does the Mg keep the...
- Q the heat of fusion of ice is 6.00 kj/mol. what numberof photons of wavelength = 6.42×10e-6m are needed to melt one gramof ice?
- Q Consider the following reaction between oxides of nitrogen:NO 21 g 2 + N 2 O 1 g 2 ¡ 3 NO 1 g 2 (a) Use data in Appendix C...
- Q 7. A piece of zinc metal with a mass of 35.0 g is heated inboiling water to 101.3 ºC and then dropped into a coffee-cupcalorimeter containing 75.0 g of water...
- Q mechanism of the synthesis of bis(2,4,6-trichlorophenyl)oxalate(cyalume)
- Q I have 0.500 Liters of water. To that 0.500 Liters, I add thefollowing:a. 0.100 moles HClb. 0.100 moles HOAcc. 0.100 moles NH4Cld. 0.100 HFe. 0.050 moles NaOHf. 0.050 moles NaOAcg....
- Q Consider a benchtop synthesis reaction for a segment of DNAconsisting of a helical arrangement of 14 nucleotides. (7 in eachstrand). The balanced chemical reaction for this hypotheticalsynthesis is given below.If...
- Q Which of the following are true concerning the limit ofquantification (LOQ) of a particular analysis method? Select allthat are valid.LOQ is larger than the detection limitLOQ depends on detector sensitivityLOQ...
- Q Part B What salt is produced in each of the followingneutralization reactions? HNO3(aq)+KOH(aq)→H2O(l)+?HNO3(aq)+Ca(OH)2(aq)→H2O(l)+? HCl(aq)+Ca(OH)2(aq)→H2O(l)+?HCl(aq)+KOH(aq)→H2O(l)+? Drag the appropriate items to theirrespective bins.Part C Which substances are always produced in an acid-baseneutralization...
- Q 5)A gaseous mixture composed of 16.0 g of O2 , 21.0 gof N2, and 16.0 g of He at 20.0°C is confined in a 25.0 Lcontainer.What is the partial pressure...
- Q 1.Which molecule or ion has the same molecular geometry asSeO32–?A.SO3B.NO3–C.CO32–D.SO32–E.SeO32.Which of the following processes is not exothermic?A. Rb+(g)+e- = Rb(g)B. Br(g)+e- = Br-(g)C. Rb+(g)+Br-(g) = RbBr(s)D. Rb(g) = Rb(s)E. 1/2...
- Q The pH of a 0.00125 M solution of an aqueous solution of XOH (X= an unknown element) is 3.55. Is XOH a strong acid, weak acid,strong base, or weak base?...
- Q A 21.466 g sample of aqueous waste leaving a fertilizermanufacturer contains ammonia. The sample is diluted with 70.668 gof water. A 11.619 g aliquot of this solution is then titrated...
- Q 1. The possible components of your mixture are unreactedferrocene and the substituted ferrocene product(s) of yourreaction, which should travel the farthest up the TLC plate(highest Rf) and why?2. Which should...
- Q Write net ionic equations for the cases whereoxidation-reduction reactions between metals and metallic ions wereobserved. (Be sure you balance the reaction so that the electronsbalance.)Copper in silver sulfate, zinc in...
- Q calculate ionization energy of He using Slaterrules
- Q The herbicide 2,4-D is being analyzed in plant matter usingtriphenylphosphate (TPP) as an internal standard. A calibrationsample is prepared by pipetting 10.0 µL of 119 µg/mL 2,4-D and 10.0µL of...
- Q organic acid is an important chemical used in the manufacture ofpolyesters and plasticizers. It contains only C, H, and O.Combustion of 19.81 mg of the acid produces 41.88 mg CO2...
- Q A sample containing 321.5 g of nitrogen gas is expandedisothermally at T=298 K from 1.023dm^3 to 57.28dm^3. Calculate q,w, delta U and delta H for four processes assuming N^2 behavesideally:(a.)...
- Q Aqueous solutions containing approximately 3 percent(w/w) H2O2are sold in drug stores as a disinfectant. Determination of theactual concentration of H2O2 in a bottle of peroxide solution wasdone by diluting 1.00...
- Q Outline the mechanism of the conversion of α-ketoglutarate tosuccinyl-CoA catalyzed by α-ketoglutarate dehydrogenasecomplex.Put these 5 steps in order:1. decarboxylation2. transacylation3. dihydrolipoyl dehydrogenase activity4. oxidation of 4-carbon group, reduction of lipoamidedisulfide5....
- Q Determination of Iron in Vitamin Supplements bySpectrophotometric AnalysisA tablet containing iron, Fe (II) fumarate (Fe2+C4H2O4 2- ) andbinder was dissolved in 0.1M HCl solution and the solution wasfiltered to remove...
- Q 1. a. In an extraction experiment, in which three compounds areextracted from a solid mixture. Why would the percent recoveries beless that 100%? Please explain.b. How do you know if...
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