Chemistry question and answers for September 29, 2023
- Q Calculate the percent by mass of the element listed first in theformulas for each of the following compounds. , 1-octanol C8H18O, â€â€ calcium phosphate Ca3(PO4)2, †3-phenylphenol C12H10O, †â€aluminum...
- Q How many mL of 6.0 NaOH must be added to 0.50 L of 0.20 M HNO2to prepare a pH = 3.86 buffer?
- Q Glycogen and Fatty Acids are used to store energy. Describe andcontrast the physiological states that would result in breakdownvs. those that would favor synthesis of these energy stores(include what is...
- Q It is recommended that drinking water contain 1.6 ppm offluoride. If the local reservoir has a diameter of 450.0 m and adepth of 10.0 m (V= Pi*r2 *h), how many...
- Q a. When 18.0 mL of a8.06×10-4 M aluminumchloride solution is combined with 15.0mL of a 5.62×10-4 M potassiumphosphate solution does a precipitateform?  (yes or no)For these conditions the Reaction Quotient, Q,...
- Q The vapor pressure of solid benzene is 299 Pa at -30ºC and 3270Pa at 0ºC. The vapor pressure of liquid benzene is 6170 Pa at 10ºC,and 15,800 Pa at 30ºC....
- Q Fill in the blanks with the given words.In the last 40 years, the concentration of carbon dioxide in theair has increased by more than 20%. IR spectroscopy shows thatcarbon dioxide...
- Q What is the pH after adding 10.0 mL of 0.10 M HCl to a 90.0 mLbuffer solution of 0.60 M CH3COOH and 0.40 MCH3COONa at 25 °C? (Ka = 1.8...
- Q Consider the titration of a 19.5 mL sample of 0.903 M HC2H3O2with 0.18 M NaOH. Ka(HC2H3O2) = 1.8x10-5 Determine the pH at theequivalence point. Enter to 4 decimal places.
- Q 12. The pH of a 0.063 M weak monoprotic acid is 3.61. Calculatethe Ka of the acid.
- Q Can you explain the major differences in the synthesis ofPentaammineaquacobalt(III) chloride andpentaamminechlorocobalt(III) chloride? The same reagents are used,but in different order. (NH3, NH4Cl, H2O2, CoCl2•6H2O ) Also, onesynthesis involves heat...
- Q Using the below data:Mass (g) of copper gluconate: 1.0 gMass (g) of wrapper: 0.6 gMass (g) of wrapper + Cu: 0.9 gMass (g) of Cu: 0.3 gMass (g) of gluconate:...
- Q Find αH2A for a diprotic acid (H2A) at pH 1.00 (Ka1 = 1.20 ×10-2 & Ka2 = 5.37 × 10-7)
- Q In vitamin C titration(ascorbic acid) expirement, Why the KIO3is weighted accurately, while KI is only roughlyweighted?
- Q A solution containing 0.10 M Zn2+ and 0.10 MFe2+ is saturated with H2S (i.e. 0.10 MH2S). (a) What must the H+ concentration be to separatethese ions by selectively precipitating ZnS?...
- Q If you had ddGTP used in sanger sequencing, describehow the nucleotide would be different than dGTP. Why is itimportant in Sanger sequencing? Be detailed in yourrepsonse.Can anyone help with this...
- Q The hydrogen atom can absorb light of wavelength 2626 nm.A)Determine the initial value of n associated with thisabsorption.B)Determine the final value of n associated with thisabsorption.
- Q A solution consists of 44.3 g ofhydrochloric acid (HCl),75.7 g water, and has a volume of101 mL.Calculate the weight percent of HCl, the molalityof HCl, the mole fraction of HCl,and...
- Q cananyone write a researech about (Lewis structure) of at least 7pages with a introduction, References, Cunclusion
- Q Colligative properties (boiling point increase)a. Order the following solutions in ascending order of theirboiling point: 0.0825 m NaCl, 0.050 m KCl, 0.050 M Na2SO4, 0.055mCa (NO3) 2, 0.050 m Na3PO4.If...
- Q if kB of a weak base is 5.9 x 10 -6 what is the pH of a 0.35 Msolution of this base?
- Q Questions and Problems1. Complete the table containing the summary of data below.Summary of Solubility and Ksp DataSat’d Ca(IO3)2 in: Solubility (M) _______ Ksp (M3 )___________T˚C ___________H2O: Solubility (M) _______ Ksp...
- Q Calculate the pH at the following intervals if 30mL 0.20M offormic acid, HCHO2 is titrated with 0.15M NaOH. ForHCHO2 Ka = 1.8 x 10-4a) before any NaOH has been addedb)...
- Q When 22.0 mL of a 5.89×10-4 M sodium hydroxide solution iscombined with 12.0 mL of a 5.49×10-4 M silver fluoride solutiondoes a precipitate form? (yes or no) For these conditions...
- Q An X-ray photon with a wavelength of 0.979 nm strikes a surface.The emitted electron has a kinetic energy of 984 eV.What is the binding energy of the electron in kJ/mol?...
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