Chemistry question and answers for August 10, 2023
- Q Be sure to answer all parts. In acidic solution, O3 and Mn2+ions react spontaneously: O3(g) + Mn2+(aq) + H2O(l) → O2(g) +MnO2(s) + 2H+(aq) E o cell = 0.84 VWrite...
- Q IR and Ramen spectra ofcrystalline barium rhodizonate have been reported. from aninspection of the data. it was concluded that the rhodizonate ion,C6O62-probably had D6hsymmetry. the other possible structure can bededuced...
- Q cholesterol is the major bio-molecule that causes heart attack;this molecule is classified as a steroid. the molecule contains adouble bond where is this located?
- Q What is the exact procedure for MOLYBDENUM BLUE METHODusing Spectrophotometer to determin phosphorus concenrration..Pleas provide with details how to make standard and blanksolutions.
- Q What alcohol should be used in the purification of esterIsopentyl propanoate (aka isoamyl propionate). And what mechanismdoes the reaction follow?
- Q how would a drug that is soluble in the blood affecthemoglobin?biochem
- Q The following questions relate to the acid-base neutralizationof HCl and NaOHHCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)a. A 25.00 mL sample of HCl is titrated with...
- Q Nitric acid (NO) reacts with oxygen gas to form nitrogendioxide (NO2), a dark brown gas:2NO(g) + O2(g) →2NO2(g)In one experiment 0.886 mole of NO is mixed with 0.503 mol ofO2.Calculate...
- Q Calculate the binding energy per nucleon (in J) for2H and 3H. The atomic masses are 2.014102 ufor 2H, and 3.016049 u for 3H. (Enterunrounded values. Assume that the mass of...
- Q Hydrogen gas reacts with nitrogen gas to form ammonia accordingto the reaction below.H2 (g) + N2 (g) → NH3 (g)a. How many moles of NH3 are produced for every 1...
- Q Solubility products for AgCl and AgI are:Ksp(AgCl) = 1.82*10-10Ksp(AgI) = 8.31*10-170.010 moles of AgCl is added to 100 mL of water, then 0.020moles of NaI is added. What are the...
- Q What polymer properties can be obtained from Thermograms (DSC,TGA, DTA....)?? LIST AT LEAST 5 Properties and show them on thegraphurgent need
- Q Experimental Studies of Reaction RatesName two molecular processes andthe timescales of these processes.
- Q HF(aq) is a weak acid with pKs = 3.17.In a solution of HF(aq) the following equilibrium sets:HF(aq)+F- (aq) = HF2-(aq) K =5.1Calculate [F-(aq)], [HF(aq)] and[HF2-(aq)] in a 0.10 M HF(aq)...
- Q In order to determine the rate of photosynthesis (the conversionby plants of carbon dioxide and water into glucose and oxygen), theoxygen gas emitted by an aquatic plant is collected over...
- Q In a direct formic acid fuel cell, formic acid (HCOOH) isoxidised into carbon dioxide and water over an alloy nanoparticlecatalyst. The standard reduction potential for O2 is +1.23 V andfor...
- Q Calculate the solubility of silver chloride in a solution thatis 0.200 M in NH3.
- Q A water sample contains 1.00*10-4 mass% silvernitrate. Silver chloride's solubility product isKsp(AgCl) = 1.82*10-10a) How much volume of 1,000 M sodium chloride solution must beadded to 1.00 L of the...
- Q The pH of a solution was found by measuring the emf of a cellcomposed of a standard silver electrode and a hydrogen electrode ofunknown hydrogen ion concentration. If the emf...
- Q The U.S. quarter has a mass of 5.67 g and is approximately 1.55mm thick.A) How many quarters would have to be stacked to reach 575 ft , theheight of the...
- Q 3- 1 mole of liquid benzene is in equilibrium with 1 mole ofgaseous benzene at 80.1 oC in a isolated piston at 1.00 atm.Suppose the pressure of the piston is...
- Q Chromium metal can be electroplated from an acidic solution of(CrO4)-2a.     Write the half reactionb.    Determine the equivalent weight ofCr.c.     What mass of Cr, in grams, willbe deposited by a current...
- Q 5. When termination is by chain transfer, what is therelationship of average degree ofpolymerization DP) and the kinetic chain length? Compare andcontrast dendrimers withblock copolymer micelles, globular proteins, inorganicnanoparticles in...
- Q 6. What technique(s) would you use to determine crystallinity ina polymer?7. What thermal instrumental technique would you use todetermine Tg?
- Q the following adsorption isotherms: Langmuir, BET, Temkin, andFreundlich. Indicate when and why each is likely to beappropriate.thats the complete question.
- Q Write the (a) balanced equation for the formation of liquidwater from hydrogen and oxygen gas, and use it to explain thefollowing terms: (b) chemical reaction, (c)reactant, (d) product.Balance the following...
- Q In organic chemistry, how does small molecule synthesis andreaction compare to biological functions and actions by variousbiochemistries? Is there a relationship that we should be aware of?How do small molecule...
- Q 12. There is an interesting problem occurring with(poly(ethylene terephthalate )PET recycling. Some manufacturers areincluding additives intended to help in the degradation of PET.Mention some additive samples.11.Why is PEG(poly-ethylene glycol) can...
- Q Consider the following three reactions. For each of thereactions, use data in Appendix C in the textbook to calculate ΔH∘,ΔG∘, and ΔS∘ at 25 ∘C.Calculate ΔS∘ for C2H6(g)+7Cl2(g)→2CCl4(g)+6HCl(g) Express youranswer...
- Q 2- The vapor pressure of pure benzene (M=78.12 amu) and puretoluene (M=92.14 amu) at 298.15 K are 103.1 Torr and 28.4 Torr,respectively. A solution is prepared from a mixture of...
- Q 32. Compare and contrast dendrimers with block copolymermicelles, globular proteins, inorganic nanoparticles in terms ofattributes and likely utility in the following applications: (a)drug delivery; (b) homogenous catalysis; and (c)solubilization..
- Q Estimate the effect of addition of 0.020 mol of NaOH on the pHof 1.0 dm3 of (a) 0.15 M CH3COONa(aq) and (b)a buffer solution containing 0.15 M CH3COOH(aq) and 0.15M...
- Q In a constant-pressure calorimeter, 60.0 mL of 0.330 M Ba(OH)2was added to 60.0 mL of 0.660 M HCl. The reaction caused thetemperature of the solution to rise from 23.72 °C...
- Q An environmental chemist obtained a 200 mL sample of lake waterbelieved to be contaminated with a single monoprotic strong acid.Titrating this sample with a 0.0050 M NaOH(aq) required7.3 mL of...
- Q 46. Define Young’s modulus. Should it be high or low for afiber?47. Define the proportionality constant in Newton’s law.
- Q 1. 0.075 moles of LiF is added to 1 L of a saturated solution ofBaF2.a) write the ksp reaction and expression for BaF2. explainb) what is the molar solubility of...
- Q 50.0 ml of 0.200 M AgNO3 is mixed with 50.0 ml of0.050 M NaCl. Calculate the concentration of Ag + and Cl- in theresulting solution, assuming the volumes are additive.Ksp(AgCl)...
- Q In a titration 34.20 mL HI, 21.78 mL of 0.250 M LiOH was neededto reach the equivalence point.a.) What is the reaction equation for this reaction?b.) How many moles of...
- Q 48. What term is used to describe the decrease of stress atconstant length with time?49. Briefly describe the Maxwell model and the Voigt–Kelvinmodel.
- Q 31. What is the initiator in the polymerization of isobutylene?
32. What is the general name of the product produced by cationicinitiation? 
33. What reactant besides the monomer is present in...
- Q 36. What would be the composition of the product obtained by thecationic low-temperature polymerization of a solution ofisobutylene in ethylene?44. Below the glass transition temperature, a material shouldbehave in what...
- Q how do you find the equivalent positions for a monoclinic spacegroup for example a C2/m space group?
- Q The surface tension of pure water is 72 dyne/cm at 20C. You areprovided with two surfactants, A and B. A 1% solution of surfactantA reduced the surface tension of water...
- Q A 29.0-g sample of NaOH is dissolved in water, and the solutionis diluted to give a final volume of 1.60 L. The molarity of thefinal solution isA) 18.1 M B)...
- Q Q-) A 25 ml of diluted bleach solution was titratedwith 19.5 ml of 0.3 M of sodium thiosulfate (Na2S2O3), if thedilution factor = 5, then the % of NaOcl in...
- Q A 10.00 gram mixture of NaHCO3 and Na2CO3 was heated andyielded 0.0357 moles of H2O and 0.1091 moles of CO2. The reactionsare described by: NaHCO3 —> Na2O +CO2+H2O and Na2CO3...
- Q Using an argument based on intermolecular forces, explain whythere is a surface tension that develops between air and water? Howwould a surfactant disrupt this tension?
- Q Solid Iron (II) Oxide reacts with Solid elemental iron andoxygen gas to create Iron (III) Oxide. Calculate ∆S​ * anddetermine the value for K of this reaction at 25C.
- Q 4.3120 g KNO3, 1.2345 g of CuCl2*2H2O, and 0.5678 g ofBaCl2*2H2O are used to prepare K2CuBa(NO2)6. Calculate thetheoretical yield of K2CuBa(NO2)6 in grams.
- Q In general, why are atoms that are farther to the right on theperiodic table more electronegative?  Additionally, whydoes the size of the atom affect its electronegativity?
- Q 0.170g of caffeine is dissolved in 10.0mL of water. The caffeineis extracted from the aqueous solution three times with 5.0-mLportions of methylene chloride. Calculate the total amount ofcaffeine that can...
- Q Your task related to this topic is to work out what theanalogous“linear transport relationâ€should be for describingchemistry in the Onsager picture. You need to identify the“force,â€the “flux,â€and the “transport coefficient.â€No...
- Q One water sample form a home in Flint had lead levels of 13,200ppb (part per billion) (See Chemical & Engineering News;February 11, 2016; vol. 97; issues 7; pp 26-29). All...
- Q Most transition metal complex ions with octahedral geometryfollow 18-electron rule. explain why it is so using the molecularorbital diagram.some transition metal with d8 electron configuration ten to formsquare planar geometry...
- Q Neutralization ReactionsIn a clean, small container (glass vial or small paper cup),place about ten drops of an ammonia cleaner and two “squirts†ofcabbage juice indicator.Use a clean medicine dropper and...
- Q Quinine, C20H24N2O2, occurs naturally in the bark of thecinchona tree and was the first effective treatment for malaria. Itis a diprotic base with Kb values of (the acidic protons are...
- Q Antifluorite structure (A2B) occurs when anions occupy latticepositions and cations occupy eight tetrahedral lattice sites of f.c. c. One of the best examples which has this structure is Li2O.The ionic...
- Q Carbonyl bromide, COBr2, decomposes to CO and Br2 withand equilibrium constant of Kc of 0.190 at 73C.COBr2(g) <--> CO (g) + Br2 (g)if 0.015 mol COBr2 is in a 2.50...
- Q When you are waiting for the crystals to appear in arecrystallisation experiemnt you should not cool the flask from hotto ice cold because you will cause ......... to happen rather...
- Q You have a 5.00 g sample of an unknown compound. After analysisyou find that its percent composition is 54.5% carbon, 9.10%hydrogen and 36.4% oxygen.What is the empirical formula for this...
- Q The corundum (Al2O3) has a rhombohedral Bravais lattice, but itclosely approximates a hexagonal lattice and is usually regarded ashexagonal. There are 30 ions per lattice site (and per unit cell).The...
- Q calculate the molar volume of hydrogen gas using thenewton-raphson method 40 atm and 300 KR=0.08206 dm3 atm K-1for Hydrogen Van der Waals constants a=0.244 dm6 atmmol-2 ,b=0.0266 dm3mol-1Â Â Â Â
- Q Dissolve 1 mole of Succinic Acid into 1 Liter of water. What is thepH of the solution? What is the molarity of the protonated anddepronated forms of Succinic Acid?
- Q 1. You have 0.95ft^3 aluminum(density=2700kg/m3,MW=26.98).Calculate the mass in kg, lbm, gmole and lbmole.2. Assume there are 39 inches in a meter.What is the externalsurface area in the SI system of...
- Q consider the rotation of 50.0mL of a 0.2M HNO3 with0.10M NaOH calculate the pH of the solutiona) before any extra NaOH has been addb) after 50mL of NaOHc) add 100mL...
- Q suppose that the reservoir contains 1.5L of 2.0M K2PO4. For howmany hours can the reservoir provide 20mM KOH at a flow rate of 1.0ml/min if 75% consumption of K+ in...
- Q Is Atomic Mass and Atomic Weight the same terms? Or is Atomicmass and Mass Number the same terms?On the MCAT Kaplan books it says that atomic mass and massnumber are...
- Q Can we compare the acid strength of HClO4 and H2SO4 in aqueoussolution? if your answeris YES, explain your reasoning. However, if your answer is no,suggest a way how we can...
- Q 22. Draw the structure of two steroid hormones and name theiruse in humans.  23. Draw 3 amino acid structures explain their primary uses andsources of the amino acids.24. Explain the four...
- Q Without drawing out correlation diagrams in detail for each2nd period homonuclear diatomic molecule separatelyplease show how simple MO theory explains the trends observed inthe properties of these molecules shown in...
- Q What is the difference between Addition and Condensationreactions? How does this relate to polymers?Write a balanced nuclear equation for the following:When iridium-192 emits a beta particle as it decaysCompare and...
- Q Write the net equations, the standard cell potential, and thenumber of electrons transferred in the following electrochemicalcells.Instructions:Enter all substances in the order listed at the top ofthe column.Use a carot...
- Q 11.What characteristics of a molecule make it likely to absorb UVlight in an analytically useful region of the UV spectrum (>185nm)?12. Why is it not typical to analyze molecules with...
- Q 0.308 g magnesiumsulphate, that contains crystal water, isdissolved in water, så the total volume is 125.0 mL. To completelyprecipitate the suflation as barium sulfate in 25.0 mL of thissolution, 5.0...
- Q 1. why is proper nutrition critical duringpregnancy?2. comment on the saying that \"a pregnant mother eatsfor two.\"3. what are the common diet-related problems duringpregnancy?give suggestions to reduce or control such...
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