Chemistry question and answers for July 16, 2023
- Q Calculate the ΔG°rxn using the followinginformation.4 HNO3(g)+5 N2H4(l)→7 N2(g)+12 H2O(l)ΔG°rxn = ?ΔH°f (kJ/mol)-133.950.6-285.8S°(J/mol • K)266.9121.2191.670.0
- Q a) Calculate the potential in the following cell (no current isflowing)Zn|Zn2+(1.00M)|| UO2 2+(1.00M), U4+ (0.1M), H3O + (1.00M)|Ptb) The cathode has a volume of 50 mL. What is the cell...
- Q Create an ordered list of the tests you will perform on yourunknown to identify its cation(Ba^{+2}, Pb^{+2}, Zn^{+2}) andanion(CO_3^{-2},SO_{4}^{-2}, PO_{4}^{-2},SCN^-, Cl^-, NO_3^-). Theprocedure for each test should be briefly described,...
- Q Consider the following reaction: CO(g)+2H2(g)⇌CH3OH(g)Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘Cunder each of the following conditions. - standard conditions - atequilibrium - PCH3OH= 1.4 atm...
- Q Determine the pH of each of the following two-componentsolutions.1)4.5×10−2 M KOH and 2.5×10−2 M Ba(OH)22)0.265 M NH4NO3 and 0.102 M HCN3)7.5×10−2 M RbOH and 0.120 M NaCl4)9.2×10−2 M HClO4 and...
- Q C. Calculate the pH of a 0.10 M aqueous solution of the weakbase ammonia, NH3 , if the degree of dissociation is 1.34%.
- Q A sample of solid Ca(OH)2 was stirred in water at acertain temperature until the solution contained as much dissolvedCa(OH)2 as it could hold. A 59.6-mL sample of thissolution was withdrawn...
- Q Describe what happens to molecular oxygen in the upperatmosphere when exposed to radiation at λ = 1030 – 1070 Å andradiation at λ = 1027 Å.  Description should include nameof the...
- Q How do you estimate what concentrations of ZnCl2 willgive a conductivity range of 300-2000 microseconds/cm?If posible please explain how in detail.
- Q Determine the pH of each of the following two-componentsolutions.1)4.5×10−2 M KOH and 2.5×10−2 M Ba(OH)22)0.265 M NH4NO3 and 0.102 M HCN3)7.5×10−2 M RbOH and 0.120 M NaCl4)9.2×10−2 M HClO4 and...
- Q Each of the following four sets contains two electrons, each ofwhich is defined by four quantum numbers (n, l, ml, ms). For eachset, indicate whether the quantum numbers for the...
- Q Consider a non-degenerate three level system with E1 < E2< E3. An intensive incident light of energy hν13 = E3 − E1 isturned on for very short period of time...
- Q In the reaction of gaseous N2O5 to yieldNO2 gas and O2 gas as shown below thefollowing data table is obtained:2 N2O5 (g) → 4 NO2 (g) +O2 (g)Data Table #1Time...
- Q Part AThe change in enthalpy (ΔrHo) for a reaction is -32 kJmol−1 .The equilibrium constant for the reaction is 4.6×103 at 298 K. Whatis the equilibrium constant for this reaction...
- Q using the data colleced for part B on your data sheet, calculatethe molar mass of the unknown acid. Show Calculations for trial #1and the average for part B.Part B Data:Trial...
- Q part 1 - A 0.100 M solution of an acid, HA, has a pH=2.00. Whatis the value of Ka of this acid?part 2 - We treat Kw as a fixed...
- Q 150.0 mL of 0.27 M HF with 230.0 mL of 0.32 M NaF Express youranswer using two decimal places.
- Q An agricultural runoff diversion system discharges into a smallriver. The runoff has thefollowing characteristics: flow = 100m3/min, DO = 3 mg/L, and BOD = 150 mg/L. The riverflows at1000m3/min and...
- Q [Cr(H2O)6]2+ is violet.Another CrL6 complex is yellow-green. (Ignore the chargeon the complex, Cr remains +2). Which of the following ligandscan't be L?amminecarbonylcyanohydroxonitro
- Q Molecular Orbital Theory -- Homodiatomics Use the molecularorbital model to fully describe the bonding in O2+, O2, O2-, andO22-. Determine which of the following statements are true andwhich are false.The...
- Q I have 5 chemistry questions here.The Ideal Gas Equation states:PV = nRTwhere \"P\" equals the pressure of the gas, \"V\" equals the volumeof the container, \"n\" equals the number of...
- Q 1.What values of x,  y andz balance the equation:xSO2    +   yH+  +   Cr2O72– → 3SO42–  + z Cr3++  H2O ?2.What is the stoichiometric ratio of solid phosphorus (P) tochlorine gas (Cl2) required to give phosphorustrichloride...
- Q 1.Which one of the following species cannot act as a base?Select one:a. H2Ob. Cl–c. NH4+d. OH–e. NH32.A gas with an empirical formula NO2 is weighed in a 1L flask and...
- Q 1.Which of the following statements about nitrogen gas isincorrect ?Select one:a. it expands when its temperature is increased at constantpressureb. the distance between particles is about the same as forliquidsc....
- Q a) C5H12(l) +O2(g) → CO2(g) +H2O(l)If 28.6 grams of pentane (C5H12) areburned in excess oxygen, how many grams of H2O will beproduced?____________g H2Ob) If baking soda (sodiumhydrogen carbonate) is heated...
- Q A 110.0 L of weather balloon filled with 6.9 moles of helium hasa small leak. If the helium leaks at a rate of 10mmol/hr, what isthe volume of the balloon...
- Q Exactly 10.8 ml of water at 31.0 degree celcius are added to ahot iron skilllet. All of the water into converted into steam at100 degree celcius. The mass of the...
- Q 1. Calculate the molarity of a solution made by dissolving0.4000 g of acetylsalicylic acid (180.15 g/mol) in 250.00 mL ofwater.2. Calculate the volume of the solution prepared in (1) neededto...
- Q Which of the following mixtures will be a buffer when dissolvedin a liter of water?A.0.3 mol NaCl and 0.3 mol HClB.0.1 mol Ca(OH)2 and 0.3 mol HIC.0.2 mol HBr and...
- Q Sulfuric acid solutions containing 60 wt% H2SO4 (specificgravity =1.498) is to be diluted to a 4.00 molar solution (specificgravity=1.213) Calculate(a)the mass fraction of sulfuric acid inthe product stream (b)taking 100...
- Q Cryolite, Na3AlF6(s), an ore used in the production of aluminum,can be synthesized using aluminum oxide. Balance the equationAl2O3 (s) + 6NaOH (l) +12HF (g) --> 2Na3AlF6 + 9H2O (g) (Ithink...
- Q What kind of an effect does an enzyme have on the rate of theforward and reverse reactions, the energy of the products andreactants and the energy of the transition state?
- Q Question 2 CH131) For the reaction 2A(g)+2B(g)⇌C(g) Kc = 68.4 at a temperatureof 311 ∘C . Calculate the value of Kp. Express your answernumerically.2)For the reactionX(g)+3Y(g)⇌2Z(g)Kp = 1.76×10−2 at a...
- Q Write balanced net ionic equations for the following reactionsin acid solution.a. Liquid hydrazine reacts with an aqueous solution of sodiumbromate. Nitrogen gas and bromide ions are formed.b. Solid phosphorus (P4)...
- Q Estimate the value of the equilibrium constant at 640 K for eachof the following reactions. ΔH∘f and S∘ for BrCl(g) is 14.6 kJ/moland 240.0 Jmol⋅K, respectively. for the following1. 2NO2(g)⇌N2O4(g)2.Br2(g)+Cl2(g)⇌2BrCl(g)
- Q Suppose that the microwave radiation has a wavelength of 10.8 cm. How many photons are required to heat 295 mL of coffee from 25.0∘C to 62.0 ∘C? Assume that the...
- Q If the decomposition of 45.987g ammonium nitrate is carried outat 18.0 degrees C and 786.3 mmHg, what volume of dinitrogenmonoxide gas will form? The other product of the reaction isgaseous...
- Q a) Name all the epimeric pairs you can find in thesediastereoisomers. At what positions are they epimeric?Using any two of these diastereoisomers as examples, name theirenantiomers and anomers.D-allose, D-altrose. D-mannose,...
- Q Pyridine (C5H5N) is a particularlyfoul-smelling substance used in manufacturing pesticides andplastic resins. Calculate the pH of a 0.145 M solution of pyridine(Kb = .00000000140).
- Q look up the structures for mannose and galactose. what wouldyou expect to see if you performed a Benedict's or Fehling's teston each monosaccharides? what would your observations tell youabout these...
- Q Once the stock solutions are prepared, describe how you wouldproduce your buffers (four). Your explanation should be detailedand quantitative.For my stock solution:KH2PO4 = (136.08 g/mol)(1M)(100.00ml/1000ml)= 13.608 gm           K2HPO4 = (174.17 g/mol)(1M)(100.00ml/1000ml)=...
- Q Consider the titration of a 28.0−mLsample of 0.180 M CH3NH2 with 0.155 M HBr. Determine each of thefollowing.the inital pHthe volume of added acid required to reach the equivalencepointthe pH...
- Q Why does solid 1-indanone and3,4-dimethoxybenzaldehyde become liquids with mixed together?Explain this phenomena using chemical terms.
- Q For the reaction A + B + 2C = 3D at 25 Celsius, the followinginitial rate data were obtained:Experiment #1: [A] = 0.1M, [B] = 0.1M, [C] = 0.2M, Initial...
- Q StepDataTrial1Trial24Time (seconds) for color change08.2107.284Notes for color changeThe starting color of the solution is pink and after that it’schanged to Yellow5Color change (if any) after one(1)drop of dilute ammonianonenone6Time (seconds)...
- Q A.) Mothballs are composed primarily of the hydrocarbonnaphthalene (C10H8). When 1.025 g of naphthalene is burned in abomb calorimeter, the temperature rises from 24.25 ∘C to 32.33∘C.Calculate the standard enthalpy...
- Q A.) A piston has an external pressure of 5.00 atm. How much workhas been done in joules if the cylinder goes from a volume of 0.170liters to 0.570 liters?B.) An...
- Q What is an extinction coefficient? Why is it different for eachprotein? Show how you would convert an extinction coefficient inM-1 cm-1 units to mg-1 mL cm-1 and how you would...
- Q A beaker with 1.90×102 mL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
- Q Chapter 15 1) The name of HClO is ________. a. hydrogen chlorideb. hydrochloric acid c. chloric acid d. perchloric acid e.hypochlorous acid 2) Identify the Bronsted-Lowry acid in thefollowing reaction....
- Q The Ostwald process is used commercially to produce nitric acid,which is, in turn, used in many modern chemical processes. In thefirst step of the Ostwald process, ammonia is reacted with...
- Q A solution prepared by mixing 50.2 mL of 0.280 M AgNO3 and 50.2mL of 0.280 M TlNO3 was titrated with 0.560 M NaBr in a cellcontaining a silver indicator electrode...
- Q Consider the following reaction at 215 K: 2 A (aq) + 1 B (aq) →1 C (aq) + 1 D (aq)An experiment was performed with the following intitialconcentrations: [A]i =...
- Q Calculate the percent yield of the aldolcondensation-dehydration reaction.I did the followingPut 0.8 mL aldehyde, 0.2 mL ketone, 4 mL ethanol, 3 mL of 2Msodium hydroxide in a flask. Then swirled...
- Q physical chemistry problems using excel:#1 Use Excel (or another graphing program) to plot the2s and 2p radial wavefunctions (R).Determine where the nodes in these functions occur. Plot the squareof the...
- Q 1.Briefly explain four colligative properties. Your explanationshould contain the following:a)definition of propertyb)does it increase or decrease with concentrationc)what mathematical equation links the property toconcentrationd)At least one example of natural applications...
- Q 1- why is method development easier with gradient elutionchromatography than isocratic separations?2- in some detail explainwhy one would use elevated temperatures in liquid chromatography ?3- what is DryLab and why...
- Q Write a chemical equation for HCl(aq) showing how it is an acidor a base according to the Arrhenius definition.Write a chemical equation for NH4+(aq) showing how it is an acidor...
- Q A closed container at 58.1ËšC and 285 mm Hg contains a mixture ofn-heptane and cyclohexane. Both liquid and vapor phases exist inequilibrium, and the vapor phase contains 32 mol %...
- Q For the following reaction, Kc = 255 at 1000 K. CO (g) + Cl2 (g)⇌ COCl2 (g) A reaction mixture initially contains a COconcentration of 0.1550 M and a Cl2...
- Q 1) Calculate how many moles of NH3 form when each quantity ofreactant completely reacts according to the equation: 3N2H4(l)→4NH3(g)+N2(g)A) 35.3 g N2H4 -Express your answer using threesignificant figures.B) 14.9 kg...
- Q 13.A student mixes 100.0 mL of 0.500M AgNO3 with 100.0 mL of 0.500 MCaCl2.a.Write the balanced molecularequation for the reaction.b.Write the net ionic equation forthe reaction.c.How many grams of precipitate...
- Q 1- what is advantage does pulsed field gradient electrophoresisin gels have over conventional slab gel electrophoresis ? 2- whatsamples uniquely are suited for this technique and why? 3- discussthe motivation...
- Q 11. A similar analysis was performed for the same exchangeablecations. However, this time the results were reported as mg of thecation per kg of soil as follows: Na = 350...
- Q Which of the following anions act as weak bases in solution?Check all that apply.Br−NO2−CN−Cl−
- Q Both aqueous HCl and HNO3 are strong acids (equal acidity inwater); yet CuO will dissolve more easily in 1 M HCl than in 1 MHNO3. What accounts for this difference?
- Q Wet air containing 60.4 mol% of pure water at 82.5˚C is fed to adehumidifier at a rate of 185 mol/hr. Outlet of the dehumidifierconsists of 2 streams – one stream...
- Q Industrial humidifiers has two inlet streams – 1. liquid waterand 2. drier air. The entering liquid water stream flows at 5.31mol/min. The component flow rate of air in the drier...
- Q If 10mL of .18M Zn(NO3)2 is added to 20.0mL of .26M NaCl andconcentration of ZnCl2 is found to be .026M. find Kc
- Q For the preparation laboratory of a 4% solution (weight /volume) sodium hydroxide at from 50 mL of a 5 mol solution. L-1this basis, it is necessary(explain your answer) Data: molar...
- Q a chemical engineer places 2.12 mol Ar, 1.37 mol N2 and 0.419mol Kr in a 6.00 L piton-cylinder assemply at 25C and 0.825 atm.what is the partial pressure of Ar
- Q The Ka of a monoprotic weak acid is 6.55 × 10-3. What is thepercent ionization of a 0.176 M solution of this acid?
- Q The reaction CH4(g) + 2 H2S(g) ↔CS2(g) + 4 H2(g) has an equilibrium constantof 2.73 at a specific temperature. The initial concentrations ofthe reactants and products are [CH4] = [CS2]=...
- Q If a 50% toluene and 50% cyclohexane mixture goesthrough to vaporization-condensation processes, what is thecomposition now?based on a distillation lab
- Q 1. How does the titration of a diprotic acid differ from amonoprotic acid (like HF)?2. How does the titration of a weak base with a strong aciddiffer from weak acid-strong...
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