Chemistry question and answers for July 22, 2023
- Q the acid-dissociation constant for benzoic acid is 6.3*10^-5.calculate the equilibrium constant concentration of h30+, C6H5COO-,and C6h5COOH in the solution if the initial concentration ofC6H5COOH is 0.050 M
- Q Calculate the pH at the equivalence point for the followingtitration: 0.10 M HCOOH versus 0.10 M NaOH. (Formic Acid Ka=1.7 x10-4)
- Q 5. Write the chemical structure, synthesis route and biomedicalapplications of polyethylene glycol?
- Q 1. What are the 4 molecular structure of polymers? Write downthe relationship between materials's strength and differentmolecular structure?2. What are the three phases that a composite has, and what aretheir...
- Q As a very rough approximation, an electron in a quantum dot canbe thought of as an electron in a 3D box. By analogy to the 2D box,write down an expression...
- Q 2 KMnO4 + 16 HCl = 5 Cl2 + 2 KCl + 2 MnCl2 + 8 H2OIf you react 22.7 grams KMnO4 with 48.6 grams HCla) how much KCl will...
- Q Arsenic acid (H3AsO4) has Ka values of 2.5 x 10–4, 5.6 x 10–8,and 3 x 10-13. What is the concentration of the HAsO42- dianion ina solution whose initial arsenic acid...
- Q When 100 mL each of 2.0 × 10-4 M Ca2+ and 2.0 × 10-2 M F- aremixed, what is the remaining Ca2+ ion concentration ? Thesolubility product constant of CaF2...
- Q The octane rating of gasoline is a relationship of the burningefficiency of the given gasoline mixture to the burning efficiencyof octane (C8H18). (Figure 1) Like most hydrocarbons, octane reactswith oxygen...
- Q Problem 15.61 Which of the following gives a buffer solutionwhen equal volumes of the two solutions are mixed? Check all thatapply. a) 0.20 M NH3 and 0.10 M HCl b)...
- Q The visible emission spectrum of hydrogen involves a transitionto n final = 2. What is initial for the line of the emissionspectrum at 434 nm? a. 5 b. 6 c....
- Q an experiment was preformed under identical conditions as yours.The absorbance of the penny solution was recorded as 0.231absorbance units. A calibration plot of absorbance vs concentrationof cu(II) (mM) yielded the...
- Q If â„“= 1, what can you deduce about n?
- Q A 135-lb person absorbs 3.3 ï‚´10-7 J of energy from radioactiveemissions. How many rads does she receive? (1 kg = 2.205 lb) 1 rad=.01J/kg
- Q Calculate [ Hg22+ ] in saturated solutionsof Hg2Br2 in:a. 0.100 M KNO3b. 0.001 M KBrNote: Ksp for Hg2Br2 =1.2 ⨯ 10-18​
- Q why should be insoluble in water CaCO3
- Q So I have a lab practical coming up; how do I know when to takean IR spec versus making a TLC chamber?Follow up question: Can someone walk me through theinterpretation...
- Q A lagoon with volume of 1200 m3 has been receiving asteady flow of a conservative (inert) waste at a rate of 100m3 /day for a long enough time to assume...
- Q Determine the groundelectronic state of the BeC molecule. Explain youranswer.The answer requires the molecular orbital diagram as well asan electron configuration.
- Q Hi, I have some questions about the concepts of energy inchemistry.#1 A particular chemical reaction has a negative deltaH and anegative deltaS. Which statement is correct?The answer:-The reaction becomes spontaneous...
- Q I will rate, please answer.acetone and toulene are bothvolatile liquids. At 25 C , the vapor pressure of pure acetone andpure otulene are 35.2 torr and 77.9 torr, respectively.a) Sketch...
- Q The enthalpy of fusion for benzene is 127.34 kJ/kg, and itsmelting point is 5.49 Celcius. Estimate deltaG when 1.00 mole ofbenzene melts at 25 Celsius.The optionns are:A. 8.312kJB. -0.696kJC. 35.661...
- Q 1- Spectrophotometric determination of copper. was thisexperiment quantitative?2- Briefly, what is the purpose of the blank measurement (whenthe cuvette was filled with water)?
- Q When you add 2.0ml of 0.50 M S2O32- to the 2.0 ml of 0.10Msilver nitrate, formation of Ag(S2O3)23- occured by equation Ag++2S2O32- <---->Ag(S2O3)23- Ecell increased even thoughformation of a solid...
- Q What is the maximum number of grams of Iron (III) sulfide,Fe2S3, which can be obtained from thereaction of 80.0g of Fe and 78.0g of S?(FW Fe=55.85, S=32.07, Fe2S3=207.91)Please show work
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