SYNTHESIS AND CHEMISTRY OF K2S2O8 ABSTRACT In this experiment‚ a sample of K2S2O8 was prepared by the electrolysis of an aqueous solution of H2SO4 and K2SO4. The peroxodisulfate anion‚ S2O82-‚ was also observed for its ability to serve as a counterion for precipitation by preparing a copper (II) complex by reacting hydrated copper (II) sulfate with ammonium peroxodisulfate in the presence of pyridine. This same ability‚ coupled with its strong oxidizing ability allowed for stabilization of
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hem ESSENTIAL QUANTUM MECHANICS This page intentionally left blank Essential Quantum Mechanics GARY E. BOWMAN Department of Physics and Astronomy Northern Arizona University 1 Great Clarendon Street‚ Oxford OX2 6DP Oxford University Press is a department of the University of Oxford. It furthers the University’s objective of excellence in research‚ scholarship‚ and education by publishing worldwide in Oxford New York Auckland Cape Town Dar es Salaam Hong Kong Karachi Kuala Lumpur
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1 decimal point = 3 x 1012 (1 significant figure) • Log 4.000 x 10‐5 = ‐4.3979400 (4 significant figures) = ‐4.3979 4 decimal points • If either the unrounded result or the result rounded has 1 as its leading significant digit‚ and . the operand’s leading significant digit isn’t 1‚ keep an extra significant figure in the result • Example A: (3.9)2 = 15.2 • Example B: 0.0144 = 0.120 • Example C: (4 x 101)2 = 1.6 x 103 Exercises • The temperature in the stratosphere is ‐18oC
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units). You are going to read the absorbance after 15‚ 30‚ 45 seconds‚ etc. until you have about 9 or 10 readings. 3) Fill a sample tube with distilled water and place in the colorimeter. Adjust the controls to give zero absorbance on the scale. 4) Mix 10cm3 of 1.0M methanoic acid with 10cm3 of the bromine solution (approximately 0.1M) in a boiling tube and start a stop clock. 5) Gently shake the mixture then transfer some to clean colorimeter sample tube and place in the colorimeter. Record
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THE WONDERFUL HYGENIC WORLD OF SHAMPOO Everyone who uses shampoo could tell you that their main factors in choosing a shampoo to use are smell‚ look‚ and price. People are misinformed about shampoo and how to tell the difference between a good shampoo and a bad one. The main point of shampoo is to cleanse your skull of residue that is picked up either from hair products such as hair spray‚ gel or moose‚ as well as the dirt in the air‚ and perspiration. Shampoo is something that all of us use on
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of the density can vary. 4) If you determine the density by using a graphical method and the method of displacing the water in the beaker and weighing the mass on the scale‚ then the second method will be more accurate. Procedure: 1) Obtain multiple samples of metal. Record your sample group in the title of the data table. 2) Measure the mass of one sample. Record the Mass. 3) Fill a 100 mL graduated cylinder half full with water. Record the volume of the water. 4) Slowly pour the metal bb’s
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Phase 3 IP CTU Online MGMT600-1301A-05: Applied Managerial Decision-Making To use the Chi-square distribution‚ the quantitative variable sales volume has to be converted into categories or groups such as “Achieved Target” vs. “Did not achieve target”. 1) A chi-square test that can be carried out in this context is to see whether the automated contact system affects whether or not the sales force achieve their targets. Null Hypothesis (HO): There is no relationship between
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is 275mL 0.125M solution of a substance. What is the concentration after a dilution when the final volume is 2.50L? Box 3 How would you prepare 60.0 mL of 0.2 M HNO3 from a stock solution of 4.00 M HNO3? What is the pH of the solution? Box 4 If 32 mL stock solution of 6.5 M H2SO4 is diluted to a volume of 500 mL. a. What would be the resulting concentration? STAMP IT!!! Box 5 Your teacher is trying to prepare a lab for the following day and you came in after school to chit chat. She
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molecules of air in the room. All of them undergo random motion at all times as a result of the internal ("heat") energy that they have absorbed. The molecules often bump into each other‚ which causes them to mix if they were not mixed previously. Q-4. How does the diffusion of Honey vary with the diffusion of ink?why? Ink diffuses at a faster rate as compared to honey. This can be explained taking in to account that honey is a more viscous liquid as compared to ink. Therefore the low viscosity
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Chem 30A Ch.1-4: Condensed Chang’s Class Notes Chapter 1 Valence electrons octet rule exceptions P and S can have 10 or 12 valence e- B and Al (Group 3) can have 6 valence e- electronegativity- how much an atom wants e- < 0.5 = nonpolar‚ covalent (i.e. H2) 0.5 - 1.9 = polar covalent direction of polarity (using arrow and delta symbol) overall dipole > 1.9 = ionic formation of ions fish-hook arrow Lewis structure formal charge Functional Groups Molecular Shape VSEPR (Valence Shell
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