Ramesh Arasasingham

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Lecture 04. Acids and Bases. Pt. 1

UCI Chem 1C General Chemistry (Spring 2013) Lec 04. General Chemistry -- Acids and Bases -- Part ... more UCI Chem 1C General Chemistry (Spring 2013) Lec 04. General Chemistry -- Acids and Bases -- Part 1 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:01:31 pH Review 0:05:10 Determining if Solution is Acidic 0:06:52 Strong Acid Characteristics 0:08:22 Showing HCl as a Strong Acid 0:15:00 Percent Undissociated 0:18:51 Finding pOH 0:25:25 Weak Acids 0:27:22 CH5CO2H Example 0:38:24 Ka/pKa Table 0:47:25 Determine if Solution is Basic 0:48:49 Strong Bases

Lecture 03. Chemical Equilibrium Pt. 3

UCI Chem 1C General Chemistry (Spring 2013) Lec 03. General Chemistry -- Chemical Equilibrium -- ... more UCI Chem 1C General Chemistry (Spring 2013) Lec 03. General Chemistry -- Chemical Equilibrium -- Part 3 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:02:02 Aqueous Acids/Bases 0:04:42 Determining which is Acid/Base/Ca/Cb 0:07:04 Autoionization of Water 0:21:06 Introducing "pH" 0:27:09 Finding COncentration from pH 0:30:59 pH and Concentration Relationship 0:42:32 Acid Equilibrium

Lecture 01. Chemical Equilibrium Pt. 1

UCI Chem 1C General Chemistry (Spring 2013) Lec 01. General Chemistry -- Chemical Equilibrium -- ... more UCI Chem 1C General Chemistry (Spring 2013) Lec 01. General Chemistry -- Chemical Equilibrium -- Part 1 View the complete course: http://ocw.uci.edu/courses/chem_1c_general_chemistry.html Instructor: Ramesh D. Arasasingham, Ph.D. License: Creative Commons BY-NC-SA Terms of Use: http://ocw.uci.edu/info. More courses at http://ocw.uci.edu Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. General Chemistry (Chem 1C) is part of OpenChem: http://ocw.uci.edu/collections/open_chemistry.html This video is part of a 26-lecture undergraduate-level course titled "General Chemistry" taught at UC Irvine by Ramesh D. Arasasingham, Ph.D. Recorded April 1, 2013. Index of Topics: 0:12:18 Calculate Species at Equilibrium 0:25:24 Writing Law of Mass Action (Kc) 0:37:17 Steps for Writing L...

Lecture 25. Chemical Kinetics Pt. 4

UCI Chem 1C General Chemistry (Spring 2013) Lec 25. General Chemistry -- Chemical Kinetics -- Par... more UCI Chem 1C General Chemistry (Spring 2013) Lec 25. General Chemistry -- Chemical Kinetics -- Part 4 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:00:00 Brief Review of Rate Law 0:03:07 Reaction Mechanism 0:10:00 Molecularity 0:15:39 Intermediates 0:18:21 Speed of reaction 0:21:59 Overall Reaction Example 0:32:00 Kinetics and Chemical Equilibrium 0:36:54 Experimentally Measured Rate Law 0:44:26 Rate Law Example Given Experiment Concentrations

Lecture 24. Chemical Kinetics Pt. 3

UCI Chem 1C General Chemistry (Spring 2013) Lec 24. General Chemistry -- Chemical Kinetics -- Par... more UCI Chem 1C General Chemistry (Spring 2013) Lec 24. General Chemistry -- Chemical Kinetics -- Part 3 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:00:00 Integrated Rate Law Intro 0:02:48 First order Reaction for Integrated Rate Law 0:04:58 Half Life 0:10:22 Finding Rate Constant for First Order Reaction 0:18:05 Second Order Reaction 0:25:19 Finding Concentration if Given Initial Concentrations 0:31:06 Zero Order Reaction 0:40:47 Summary of Kinetic Reactions 0:43:49 Integrated Rate Laws for Reactions with More than One Reactant

Lecture 23. Chemical Kinetics Pt. 2

UCI Chem 1C General Chemistry (Spring 2013) Lec 23. General Chemistry -- Chemical Kinetics -- Par... more UCI Chem 1C General Chemistry (Spring 2013) Lec 23. General Chemistry -- Chemical Kinetics -- Part 2 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:00:00 Review on Rates 0:04:02 Kinetic Rate Laws 0:08:57 Example Using N2O5 0:15:53 Determining Rate Law and Order for Reaction 0:28:16 Determing Rate Expression and Value of the Constant 0:42:56 Measuring Rate of Chemical Reaction with Graphs

Lecture 22. Chemical Kinetics Pt. 1

UCI Chem 1C General Chemistry (Spring 2013) Lec 22. General Chemistry -- Chemical Kinetics -- Par... more UCI Chem 1C General Chemistry (Spring 2013) Lec 22. General Chemistry -- Chemical Kinetics -- Part 1 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:00:00 Change in Free Energy Review 0:01:40 Intro to Chemical Kinetics 0:06:43 Defining Chemical Kinetics 0:09:57 Reaction Rate 0:15:02 Example of Reaction Rate 0:24:41 Average Rate of Concentration vs Time 0:34:13 Example of NO Gas Reaction Rate 0:40:08 Relationship Between Reaction Rates 0:47:57 Forward/Reverse Reactions

Lecture 16. Electrochemistry Pt. 1

UCI Chem 1C General Chemistry (Spring 2013) Lec 16. General Chemistry -- Electrochemistry -- Part... more UCI Chem 1C General Chemistry (Spring 2013) Lec 16. General Chemistry -- Electrochemistry -- Part 1 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:00:00 Oxidation Reduction Reaction Review 0:02:55 Oxidation Numbers 0:04:50 Rules for Assigning Oxidation Numbers 0:10:13 Calculating Oxidation Number Example 0:16:26 Redox Reactions 0:17:10 Half Reactions 0:23:09 Example of Redox Reactions 0:37:58 Balancing Oxidation-Reduction Reactions 0:47:04 Challenging Redox Question

Lecture 09. Acids and Bases. Pt. 6

UCI Chem 1C General Chemistry (Spring 2013) Lec 09. General Chemistry -- Acids and Base -- Part 6... more UCI Chem 1C General Chemistry (Spring 2013) Lec 09. General Chemistry -- Acids and Base -- Part 6 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:00:00 Common Ion Effect Review 0:03:35 Buffered Solutions 0:09:20 Examples of Buffers 0:15:07 How Does a Buffer Work? 0:32:24 Calculating the pH of the Buffer

Lecture 05. Acids and Bases. Pt. 2

UCI Chem 1C General Chemistry (Spring 2013) Lec 05. General Chemistry -- Acids and Bases -- Part ... more UCI Chem 1C General Chemistry (Spring 2013) Lec 05. General Chemistry -- Acids and Bases -- Part 2 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:01:27 Weak Acids Dissociate Partially 0:06:18 Summary of Ka and Strength of Acid 0:12:00 Bases Overview 0:14:20 NH2- and Strong Base Example 0:20:23 Weak Base NH3 Example 0:37:55 Rankning COmpounds Based on Base Strength 0:47:46 Weak Acid/Base Equilibria

Synthesis and Structural Characterization of Octaethyl-17-thiochlorin and Octaethyl-7,17-dithioisobacteriochlorin

Heterocycles, 1988

Detection of alkylperoxo and ferryl, (FeIV:O)2+, intermediates during the reaction of tert-butyl hydroperoxide with iron porphyrins in toluene solution

Journal of the American Chemical Society, 1989

PFe" and PFeII'OH (P is a porphyrin dianion) catalyze the decomposition of tert-butyl hydroperoxi... more PFe" and PFeII'OH (P is a porphyrin dianion) catalyze the decomposition of tert-butyl hydroperoxide in toluene solution without appreciable attack on the porphyrin ligand. 'H NMR spectroscopic studies at low temperature (-70 "C) give evidence for the formation of a high-spin, five-coordinate intermediate, PFe11'OOC(CH3)3. On warming this decomposes to PFelI'OH (P = tetramesitylporphyrin, TMP) or PFe"'0Fe"'P (P = tetra-p-tolylporphyrin, TTP) with the formation of (TMP)Fe"=O as an observed intermediate in the first case. Treatment of PFe'1'OOC(CH3)3 at-70 "C with N-methylimidazole (MeIm) yields the intermediate (Me1m)PFeN=O. Organic products formed from this reaction are tert-butyl alcohol, di-tert-butyl peroxide, benzaldehyde, acetone, and benzyl-tert-butyl peroxide, which arise largely from a radical chain process initiated by the iron porphyrin but continuing without its intervention. The peroxidase, catalase, and cytochrome P-450 enzymes utilize alkyl hydroperoxides to generate high-valent oxoiron porphyrins.'-3 Extensive studies on the peroxidase-catalyzed oxidations have established that the enzyme reacts with hydroperoxides to form

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Mechanism of manganese porphyrin-catalyzed oxidation of alkenes. Role of manganese(IV)-oxo species

Journal of the American Chemical Society, 1993

... Mechanism of Manganese Porphyrin-Catalyzed Oxidation of Alkenes. Role of Manganese( 1V)-Oxo S... more

Symmetrical and unsymmetrical quadruply aza bridged closely interspaced cofacial bis(5,10,15,20-tetraphenylporphyrins). 3. Interplanar distances, proton NMR chemical shifts, and the catalysis of the electrochemical reduction of oxygen

Journal of the American Chemical Society, 1992

... Bis( 5,10,15,20-tetraphenylporphyrin)s. 2. Synthesis, Characterization, and Conformational Ef... more

Using Knowledge Space Theory To Assess Student Understanding of Stoichiometry

Journal of Chemical Education, 2004

Using the concept of stoichiometry we examined the ability of beginning college chemistry student... more

Following the Development of the Bonding Concept Using Knowledge Space Theory

Journal of Chemical Education, 2002

Students are introduced to the bonding concept in high school chemistry; the concept is reintrodu... more

Assessing the Effect of Web-Based Learning Tools on Student Understanding of Stoichiometry Using Knowledge Space Theory

Journal of Chemical Education, 2005

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ChemInform Abstract: Formation and Alkene Epoxidation by Higher-Valent Oxo- metalloporphyrins

Cheminform, 2010

The dynamics of the reactions of methyl diphenylhydroperoxyacetate with meso-tetrakis(2,6-dimethyl-3-sulfonatophenyl)porphinatomanganese(III) hydrate and meso-tetrakis(2,6-dichloro-3-sulfonatophenyl)porphinatomanganese(III) hydrate and imidazole complexes. Comparison of the reactions of manganese...

J Am Chem Soc, 1991

Formation and Alkene Epoxidation by Higher-Valent Oxo-Metalloporphyrins

The Activation of Dioxygen and Homogeneous Catalytic Oxidation, 1993

The mechanisms by which an “oxene equivalent” is transferred from an oxygen donor to metalloporph... more The mechanisms by which an “oxene equivalent” is transferred from an oxygen donor to metalloporphyrins to provide higher valent metallo-oxo porphyrins and the oxygenation reactions of the latter have been the subject of considerable attention. Interest in these reactions stem from their relevance to the biochemical reactions of peroxidases with alkyl hydroperoxides,1 catalases with hydrogen peroxides2 and the metabolic reactions catalyzed by cytochrome P-450 enzymes. The cytochrome P-450 enzymes catalyze, among other reactions, the epoxidation of alkenes.3 Studies on these heme containing monooxygenases reveal that one of the key steps during the reaction is the formation of an enzyme bound hypervalent iron-oxo porphyrin. From this, ensued investigations directed toward the elucidation of the mechanisms of formation and reactions of such species.

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