nent-delivery/start/4573065653?action=onresume&submissionld=484459992H2.1Li Be1.0 1.5BND1.5 2.5 3.0 3.5 4.0Na Mg0.9 1.2Al SiPSCI1.5 1.8 2.1 3.5 3.0K Ca Sc Tiv Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br0.8 1.0 1.3 1.5 1.6 1.6 1.5 1.8 1.9 1.8 1.9 1.6 1.6 1.8 2.0 2.4 2.8Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te0.8 1.0 1.2 1.4 1.6 1.8 1.9 2.2 2.2 2.2 1.9 1.71.7 1.8 1.9 2.1 2.5Hf Ta w ReOs Ir Pt Au Hg TI Pb Bi Po At1.3 1.5 1.7 1.9 2.2 2.2 2.2 2.4 1.9 1.8 1.9 1.9 2.0Cs Ba0.7 0.92.2Fr Ra0.7 0.9Using the above table of electronegatives, classify the O-H bond in water as either pure covalent, polar covalent or ionic. (Electronegativity difference, AEN > 1.7 = ionic, AEN 0.4-1.7 = polar covalent, and AEN < 0.4 = nonpolar covalent).O nonpolar covalentO polar covanentO ionic14NextSign outDELL->女@2324%4.ertyad.C1,41

2.1 u Be 1.0 1.5 NDF BC 1.5 25 3.0 3.5 4.0 Na Mg 0.9 1.2 Al Si 1.5 1.8 2.1 S CI 3.5 3.0 P K Ca Sc Tivr Mn Fe Co NI Cu 0.8 1.0 13 15 1.6 1.6 15 1.8 1.9 1.8 1.9 Zn Ga Ge As Se Br 2.4 2.8 1.6 1.6 1.8 2.0 Rb Sr 0.8 1.0 1.2 1.4 1.6 1.8 1.9 2.2 2.2 22 1.9 Y Zr Nb Mo Tc Ru Rh Pd Ag Cd Sn Sb 1.7 1.7 1.8 In Te I 1.9 2.1 2.5 Cs Ba 0.7 0.9 Hf Ta w Re Os Ir Au Hg TI Pb Bi 1.3 1.5 1.7 1.9 2.2 2.2 2.2 2.4 1.9 1.8 1.9 Pt Po At 1.9 2.0 2.2 Fr Ra 0.7 0.9 Using the above table of electronegatives, classify the O-H bond in water as either pure covalent, polar covalent or ionic. (Electronegativity difference, A EN >17 = ionic, AEN 0.4-1.7 = polar covalent, and AEN <0.4 = nonpolar covalent). O nonpolar covalent O polar covanent O ionic

2.1 u Be 1.0 1.5 NDF BC 1.5 25 3.0 3.5 4.0 Na Mg 0.9 1.2 Al Si 1.5 1.8 2.1 S CI 3.5 3.0 P K Ca Sc Tivr Mn Fe Co NI Cu 0.8 1.0 13 15 1.6 1.6 15 1.8 1.9 1.8 1.9 Zn Ga Ge As Se Br 2.4 2.8 1.6 1.6 1.8 2.0 Rb Sr 0.8 1.0 1.2 1.4 1.6 1.8 1.9 2.2 2.2 22 1.9 Y Zr Nb Mo Tc Ru Rh Pd Ag Cd Sn Sb 1.7 1.7 1.8 In Te I 1.9 2.1 2.5 Cs Ba 0.7 0.9 Hf Ta w Re Os Ir Au Hg TI Pb Bi 1.3 1.5 1.7 1.9 2.2 2.2 2.2 2.4 1.9 1.8 1.9 Pt Po At 1.9 2.0 2.2 Fr Ra 0.7 0.9 Using the above table of electronegatives, classify the O-H bond in water as either pure covalent, polar covalent or ionic. (Electronegativity difference, A EN >17 = ionic, AEN 0.4-1.7 = polar covalent, and AEN <0.4 = nonpolar covalent). O nonpolar covalent O polar covanent O ionic

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter15: Molecular Luminescence Spectrometry

Section: Chapter Questions

Problem 15.12QAP: Equations for the chemiluminescence determination of SO2 are given on page 383. Derive an expression...

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Ali has measured the oxidative stability of palm oil sample under accelerated storage condition at 60*C for 6 days The following data were recorded for the peroxide value and p anisidine value of the palm oil after 5 days of storage time: Sample weight 1.0030 g Concentration of NazSzO3 = 0.001 N Volume of NazSzO3 titrated for sample solution = 1.35 ml Volume of NazSzO3 titrated for blank solution 0.20 ml Absorbance for sample solution = 0.907 Absorbance for blank solution 0.203 Calculate: i) peroxide value ii) p-anisidine value iii) TOTOX value
Organic carbon in seawater can be measured by oxidation to CO2 with K2S2O8, followed by gravimetric determina- tion of CO2 trapped by a column of Ascarite. Water weighing 6.234 g produced 2.378 mg of CO2 (FM 44.010). Find ppm carbon in the seawater.
Potassium dichromate has several industrial applications. To determine the purity of the salt that will be used in different industrial processes, a sample mass equal to 2.660 g was dissolved and quantitatively transferred to a 500.00 mL flask. An aliquot of 25.00 mL of this solution was treated with excess KI and the released iodine was titrated with 0.1000 mol L-1 sodium thiosulfate, spending 27.00 mL. Calculate the purity of the analyzed salt. Data:K = 39.10 O = 16.00 Cr = 52.00 I = 126.9 S = 32.07
For the reduction 2FeCl3 + SnCl2 =====➔ 2 FeCl2 + SnCl4 in aqueous solution the following data were obtained at 25oC t(min) 1 3 7 11 40 Y 0.01434 0.02664 0.03612 0.04102 0.05058 Where y is the amount of FeCl3 reacted in moles per liter. The initial concentrations of SnCl3 and FeCl3 were respectively, 0.03125, 0.0625 moles/L. a.)Show that the reaction is third order (derive the rate law), and b.) calculate the average specific rate constant.
Suppose that something had gone wrong in the Big Bang, and instead of ord inary hydrogen there was an abundance of deuterium in the universe . There would be many subtle changes in equilibria, particularly the deuteron transfer equilibria of heavy atoms and bases. The Kw for D2O, heavy water, at 25 °C is 1.35 x 10-15. (a) Write the chemical equation for the autoprotolysis (more precisely, autodeuterolysis) of D2O. (b) Evaluate pKw for D2O at 25 ° C. (c) Calculate the molar concentrations of D3O+ and OD- in neutral heavy water at 25 °C . (d) Evaluate the pD and pOD of neutral heavy water at 25 °C. (e) Formulate the relation between pD, pOD, andpKw(D2O).
The percentage protein content of chicken breasts are determined 5 times and the following results obtained: 28.5, 30.1, 30.2, 30.0 en 30.2%. The first value (28.5%) appears anomalous. Should it be retained or rejected at a 90% confidence level? Show all equations.
Organic carbon in seawater can be measured by oxidation to CO2 with K2S2O8, followed by gravimetric determination of CO2 trapped by a column of Ascarite. Water weighing 6.234 g produced 2.378 mg of CO2 (FM 44.010). Find ppm carbon in the seawater.
18. Jet is an undergraduate chemistry student, he’s out in the laboratory trying to determine the volatile organic compounds as well as overall protein content of the leaf and stem of a malunggay (Moringa oleifera). He subjected the leaf and stem in a separate digestion reaction (treatment of sulfuric acid), afterwards he subjected the products to high temperature induction to get a dry ash like substance. Which type/s of chemical analysis did Jet employ to reach his objective?I. Qualitative AnalysisII. Quantitative Analysis III. Instrumental Chemical AnalysisIV. Wet Chemical AnalysisA. II & IV onlyB. I & IV onlyC. I, II & IV onlyD. I, II, III, IV
The chromium in an aqueous sample was determined by pipetting 10.0 ml. of the unknown into each of five 50.0-mL volumetric flasks. Various volumes of a standard containing 12.2 ppm Cr were added to the flasks, following which the solutions were diluted to volume. Unknown,mLStandard, mLAbsorbancc 10.00.00.201 10.010.0 0.292 10.020.0 0.378 10.030.0 0.467 10.040.0 0.554 (a) Plot the data using a spreadsheet. (b) Determine an equation for the relationship between absorbance and volume of standard. (c) Calculate the statistics for the least-squares relationship in (b). (d) I)ctcrmine the conccnt ration oÍCr in ppm in the sample. (e) Find the standard deviation of the result in (d).
Equations for the chemiluminescence determination of SO2 are given on page 383. Derive an expression for the relationship between the concentration of SO2 in a sample, the luminescence intensity, and the equilibrium constant for the first reaction.
To a 0.5 g sample of impure NaCl are added 0.784 g of pure AgNO3 (MW = 169.88) crystal. This is in excess of the amount required to ppt. All the Cl as AgCl. After dissolving and filtering out the pptd. AgCl, the filtrate requires 25.50 ml of 0.028M KCNS. What is the percentage of NaCl (MW=58.44) in the sample? A. 55.40 % B. 50.10% C. 45.60% D. 100%
Whic‎h of the follo‎wing are eq‎uivalent to 2,5‎00 ppm Cu2+? (There may be more than one answer) MW: Cu (63.55) a) 2.5 p‎pb Cu2+ b) 2,500‎,000 ppb Cu c) 2.5‎ ppt Cu2+ d) 39.‎34 mM e) 0.039‎34 M f) 0.0786‎8 N (in precipitation reaction) g) 0.078‎68 N (in redox into Cu+)