Chemistry question and answers for July 31, 2023
- Q This is a multi-part question.You wish to do a quantitative analysis of chromium metal in thechemical form of potassium dichromate, K2Cr2O7, which visually is avery bright and rich orange color.Part...
- Q Nitrous acid, HNO2, has a Ka of 7.1 x 10-4. What are (H3O+),(NO2-), and (OH-) in 0.700M HNO2?a)  (H3O+)=.........M…………………………answer a in Mb))  (NO2-)=..........M…………………………answer b in Mc)  (OH-)..............x 10 .......M...........(answer c  ...
- Q Forthe reaction, 2 N2O5--> 4 NO2+O2, the rate of formation of NO2is 0.004 mol^-1 s^-1.A) Calculate the rate of disappearance of N2O5B) Calculate the rate of appearance of O2
- Q Provide a detailed description of the theory of Luminescencespectroscopy and explain (in general terms) how it used in thefield of physical chemistry.
- Q Calculate the alpha values for tartaric acid at pH values of:0.00, 2.00, 4.00, 6.00, 8.00
- Q Rank the following atoms or ions in order of increasing radius:As^3-, Se^2-, Ge^4+, Rb^+, Br^-Ca, Ba, Sr, Be, MgAl, Cl, P, Si, SSb, As, F, S, TlName an element who...
- Q Liquid chlorotribromethane has a density of 2.71 g/mL.A barometer is constructed using chlorotribromethane instead ofmercury. If the atmospheric pressure is 0.953 atm, what is theheight of the chlorotribromethane column in...
- Q Complete and balance the following equations, and identify theoxidizing and reducing agents. (Recall that the O atoms in hydrogenperoxide, H2O2, have an atypical oxidation state.)1. Complete and balance the following...
- Q I recently performed a lab on Chemical Equilibrium.Here is some background on the experiment:-We made a stock solution by combining Fe(NO3)3 and NH4SCN. Thismade a blood red solution. Then, we...
- Q Be sure to answer all parts.Rank the following species according to their relativestability and indicate their magnetic properties:O2, O2+, O2−(superoxide ion), and O22−(peroxide ion)<<<(select)diamagneticparamagnetic(select)diamagneticparamagnetic(select)diamagneticparamagnetic(select)diamagneticparamagnetic
- Q 2,4-Dichlorophenoxyacetic acid (\"2,4-D\") is a widely usedherbicide with the molecular formula C8H6Cl2O3. The pKa of 2,4-D is2.73. A certain water-based herbicide product contains 110 gL−1 of2,4-D. What is the pH...
- Q My alpha radiation source ispolonium-210. When new, the activity of the source is 0.1microcurie.1.What is the half-life?2.Calculate the decay constant.3.What is the activity of the newsource in bequerels?4.How many 210Po...
- Q Flame-retardant fabrics often have ________ atoms incorporatedinto the fabric's fibers.a) N or Clb) N or Oc)Cl or Crd)Cl or Br
- Q explain why all glassware must be dry and the solvent anhydrousduring formation and reaction of a grignard reaction. Further,explain whether acetone would be a viable solvnt for a generationof a...
- Q Pre-Lab Assignment1. A 0.1017 g sample of KBrO3 was dissolved in dilute acid andtreated with an excess of KI. BrO3¯ + 9I¯ + 6H+ Br¯ + 3I3¯ + 3H2OThe generated...
- Q in a lab experiment to test the change in temperatureof NaCl and the change in temperature of water:Specific heat of NaCl is 0.88specific heat of DI water is 4.2in the...
- Q Aqueous hydrochloric acid and aqueous potassium permanganatereact to form chlorine gas, liquid water, solid potassium chloride,and aqueous manganese chloride. If 8.88×104 milligrams ofhydrochloric acid reacts with an excess of potassium...
- Q Why are we performing each of the following four steps duringthe work-up of the second synthesis (“Hydrogenation of aChalconeâ€)? (What is the purpose of each step?) Please explain.a) Add 15...
- Q A solution is made by mixing 12.5g of Sr(OH)2and 40.0 mL of 0.200 M HNO3.a. Calculate theconcentration of OH− ion remaining in solution.b.Calculate the concentration of Sr2+ ion remaining insolution.c.Calculate...
- Q 1. The solubility product, Ksp, for aluminumhydroxide, Al(OH)3, is 1.9 ✕ 10−33 at 25°C.What is the molar solubility of aluminum hydroxide in a solutioncontaining 0.066 M KOHat 25°C?
- Q 1. Glycogen:a.)  Is mainly broken down to glucose-1-P byglycogen synthaseb.)  Has branch chains that are attached at thebranch points by alpha 1,4glycosidic linkagesc.)  Built by glycogen phosphorylase when thereis high ATP...
- Q how do you know that adding access 6M HCl to a solution oflead (II) ions will not precipitate all the Pb2+ ions from thatsolution
- Q A)Calculate the mass defect of the oxygen nucleus16Â Â 8O. The mass of neutral 16Â Â 8O is equal to15.994914 atomic mass units.Express your answer in atomic mass units to four significantfigures.B)Calculate the binding...
- Q Estimate the fugacity for each species in the following gases at290 K and 800 bar:(a) Pure oxygen;(b) Pure nitrogen;(c) Oxygen and nitrogen in a 30% mol O2 and 70% mol...
- Q What is the difference between biochemical, pharmaceutical, anddiagnostic chemical reactions in healthcare?What is a specific example that exists for each of thesechemical reaction types above and why might it be...
- Q Express the concentration of a 0.0400M aqueoussolution of fluride,F-, in mass percentage and in parts permillion.Assume the density of the solution is 1.00f/mL.
- Q Complete the table using the following data:IO3- (aq) +6S2O32- (aq) +6H3O+ (aq) --> I- (aq) +3S4O62- (aq) + 9H2O(l)Sodium Thiosulfate Solution Concentration (M)0.051 MVolume Calcium Iodate Solution Added (L)0.01 LThiosulfate...
- Q From a molecular viewpoint, where does the energy absorbed in anendothermic chemical reaction go?
- Q A sample of 7.60L of NH3 (ammonia) gas at 22 ?C and 735 torr isbubbled into a 0.300L solution of 0.400 M HCl(hydrochloric acid).The Kb value for NH3 is 1.8
- Q A 80.0 mL sample of 0.0300 M HClO4 is titrated with 0.0600 MCsOH solution. Calculate the pH after the following volumes of basehave been added.(a) 17.2 mL pH = (b)...
- Q A CHEM 2242 student dissolved 69.322 g of an unknown monoproticacid in a 250 mL volumetric flask. The student then transferred5.00 mL of this solution into a conical flask and...
- Q A 25.0 mL sample of 0.125 molL−1 pyridine (Kb=1.7×10−9) istitrated with 0.100 molL−1HCl.Calculate the pH at one-half equivalence point.Calculate the pH at 40 mL of added acid.Calculate the pH at...
- Q 1. A 0.4243-g sample of CaCO 3 is dissolved in 12 MHCI and the resulting solution is diluted to 250.0 mL in avolumetric flask.a) how many moles of the CaCO...
- Q Nitrous acid has a Ka of 4.0 * 10-4. in 1.00 L of solution,0.670 moles of nitrous acid (HNO2) are added to 0.281 moles ofNaOH. What is the final pH?
- Q Why is the “standard additions†a better method compared to theexternal calibration method?
- Q Question 1: Using Hard/Soft Acid/Base Concepts (HSAB) pleasedecribe the followinga) Dimethylmercury, Hg(CH3)2, is one of the strongest knownneurotoxins. Is it safe to mix mercuric fluoride, HgF2, with methyllithium, LiCH3? Explain...
- Q When Vo = 0.5× Vmax, [S] = 1× Km. Which of the following is truewhen [S] = 4× Km?V0 = 40% of Vmaxnone of theseV0 = 8% of VmaxVo =...
- Q Hydrochloric acid (HCl) reacts with sodium carbonate (Na2CO3),forming sodium chloride (NaCl), water (H2O), and carbon dioxide(CO2). This equation is balanced as written:2HCl(aq)+Na2CO3(aq)→2NaCl(aq)+H2O(l)+CO2(g)Part A: What volume of 2.75 M HCl in...
- Q (a) If the molar solubility of Cd3(PO4)2 at 25 oC is 1.19e-07mol/L, what is the Ksp at this temperature?Ksp =(b) It is found that 0.00178 g of Ag3PO4 dissolves per...
- Q A 0.10 mol sample of AgNO3 is dissolved in a 1.00 L of 1.00 MNH3 (aq) solution. If 0.010 mol NaCl is added to this solution,will AgCl(s) precipitate? Show the...
- Q A mixture of 20.6g of phosphorus (P) and 79.4 chlorine (Cl2)reacts completely to form phosphorus trichloride (PCl3) andphosphorus pentachloride (PCl5).(a) true or false: the bond angels of PCl3 and PCl5...
- Q Vapor Pressure of pure ethanol is 40.0 torr at 19 degrees C3.42g of sugar (C12H22O11, non-volatile, non-electrolyte) isadded to 50.0 mL of ethanol (C2H6O, 0.79 g/mL, melting point = -114degrees...
- Q HMN Item 1921Part AA 2.52 g lead weight, initially at 11.0 ∘C, is submerged in 8.15g of water at 52.3 ∘C in an insulated container.What is the final temperature of...
- Q In a isolation of organic compounds phenanthrene, methyl4-aminobenzoate and 1,4-dibromobenzene was dissolved in diethylether. HCl was used to separate the aqueous and organic layer. Theaqueous layer contains methyl 4-aminobenzote +H++Cl-....
- Q Examine the effects of the detergent sodium dodecyl sulfate(SDS) on the binding activity of serium albumin (this detergent isa strong protein denaturant).
- Q 4- Aspirin can be made in the laboratory by reacting aceticanhydride (C4H6O3) with salicylicacid (C7H6O3) to form aspirin(C9H8O4) and acetic acid(HC2H3O2). The balanced equationis:           C4H6O3  +  C7H6O3    →    C9H8O4  +  HC2H3O2           In a laboratory synthesis, a...
- Q Given the following acids or bases. 1) H2PO4 -2 2) CH3NH3 a.Write the reactions for each of the above b. Write the Kexpressions for the reactions and look up the...
- Q correctly list the molecules in order of increasing boilingpoint (from lowest to highest)?a.)CH3CH2CH2-OHb.)CH3CH2CH2CH3c.)CH3CH2-OHI know the the answer wold be b,c,a but I don't understandwhy
- Q Consider the titration of 80.0 mL of 0.0200 M NH3 (aweak base; Kb = 1.80e-05) with 0.100 M HBrO4.Calculate the pH after the following volumes of titrant have beenadded:(a) 0.0...
- Q Calculate the [H3O+] of the following polyprotic acid solution:0.135 M H3C6H5O7.Express your answer using two significant figures.Calculate the pH of this solutionExpress your answer to two decimal places.
- Q 2. A mixture weighing 42.500 g contains 7.500 g NH4Cl, 19.650 gSiO2. With the remainder being NaCl. Find the percent by weight ofeach component. Show your calculations.
- Q You need to prepare 100.0 mL of a pH=4.00 buffer solution using0.100 M benzoic acid (pKa = 4.20) and 0.220 M sodium benzoate. Howmuch of each solution should be mixed...
- Q Calculate the solubility (in mol/L) of lead(II) chloride, PbCl2,at 25 degrees celsius. Ksp = 1.59 x 10^-5
- Q GasChromatographyHow are compounds separated byGC? What kind of information do we get from GC/MSanalysis?
- Q Find the effective nuclear charge for the 2s electrons in theLithium atom. How much does each 1s electron shield the 2s electronfrom the nucleus?
- Q pH Dependence of Drug Absorption lab1. Calculate the amount of Na2HPO4 *7H2O ( in grams) needed to make 50 mL of a 0.40 Msolution.2. Calculate the amounts of Na2HPO4 andNaH2PO4...
- Q What is meant by the term steady state?
- Q Approximately 10000 anti-protons were synthesized and stored ina magnetic containment device at a particle accelerator facility.Due to the containment failure, the amount of antimatterannihilated completely. Calculate the energy that was...
- Q Organic chemistryGas chromatography lab questions :1. Briefly explain the various parts of a GC - Injection port,oven, copper coil, and detector.2. Identify the stationary phase and the mobile phase.3. What...
- Q A charge neutral macrocyclic ligand having four donor atomsfroms a red, diamagnetic complex of Ni(II). The counter ions forthis complex is the very weak Lewis base, ClO4-. When ClO4- isreplaced...
- Q A)Â Â Â Â Â Carbonic acd, H2CO3, can befound in a wide variety of body fluids (from dissolved CO2).Calculate the hydronium ion concentration of 6.38 x 10 ^-4 M, H2CO3solution. What is the...
- Q In many cancer cell lines, PDH kinase (PDK) activity isincreased. The result of this regulation is that pyruvate isdirected towards a pathway other than the TCA cycle. Once again,using your...
- Q The following reaction can occur when a match is struck:KClO3(s) + 3 P4(s) ------- > 3 P4O10(s) + 10 KCl(s)(a) How many grams of KCl(s) can be produced from 38.56milligrams...
- Q cetylsalicylic acid, a monoprotic weak acid, is the activeingredient in aspirin. Two aspirin tablets, each containing 500.0mg of acetylsalicylic acid, are dissolved in 25.0 mL water. a.Calculate the pH of...
- Q A 200-L home heater tank contains butane gas (C4H10) at 26.0 °C.When some of the butaneis removed and burned in excess air, the pressure in the tank dropsfrom 2.34 atm...
- Q During the dehydration experiment, C2H4(g) andunreacted C2H5OH(g) passed through the tube into thewater. The C2H4 was quantitatively collected as a gas, but theunreacted C2H5OH was not. Explain this observation in...
- Q Consider a solution that is 1.5×10−2 M in Ba2+ and 1.9×10−2 M inCa2+.What minimum concentration of Na2SO4 is required to cause theprecipitation of the cation that precipitates first?Minimum Na2SO4 required...
- Q NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl actsas a weak acid. What is the pH of a solution that is 0.019 M...
- Q Multiparty questionGc= gas chromatography labBriefly explain the various parts of a GC - Injection port,oven, copper coil, and detector.,Then Identify the stationary phase and the mobile phase. Andfinally What is...
- Q For silicone rubber clearly states the possibility orimpossibility of each process and includes the pros and cons foreach possible for mold process.
- Q xplain the purpose/function of each of the following reagentsused in the isolation of the iron containing protein: (4 pointseach)ChymotrypsinHydroxylamine hydrochloride1,10â€phenanthrolineEthanolTrichloroacetic acid
- Q An undisturbed core of soil at field capacity was taken from afield site had a wet weight of 420 g. The following information wasmeasured in the lab. The oven dry...
- Q For the following reaction KClO3---->KCl+1/2 O2 assignoxidation states to each element on each side of theequation...reactants and products. Which element is oxidized? Whichelement is reduced?Reactants for K, Cl, and O...
- Q For a reaction with ΔH∘=−24 kcal/mol and ΔS∘=0.07 kcalmol−1K−1,calculate the equilibrium constant at: (1.) 30 ∘C and (2.) 150∘C.
- Q You hear about an opportunity for a process engineer with acompany that is starting a new commercial plant to produce ethanolfrom hybrid poplar trees. You apply and soon get called...
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