General Chemistry II Chapter 19 Lecture Notes Electrochemistry
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Chapter 10 – Chemical Reactions Notes
Chapter 8 – Chemical Reactions Notes Chemical Reactions: Chemical reactions are processes in which the atoms of one or more substances are rearranged to form different chemical compounds. How to tell if a chemical reaction has occurred (recap): Temperature changes that can’t be accounted for. o Exothermic reactions give off energy (as in fire). o Endothermic reactions absorb energy (as in a cold pack). Spontaneous color change. o This happens when things rust, when they rot, and when they burn. Appearance of a solid when two liquids are mixed. o This solid is called a precipitate. Formation of a gas / bubbling, as when vinegar and baking soda are mixed. Overall, the most important thing to remember is that a chemical reaction produces a whole new chemical compound. Just changing the way that something looks (breaking, melting, dissolving, etc) isn’t enough to qualify something as a chemical reaction! Balancing Equations Notes: Things to keep in mind when looking at the recipes for chemical reactions: 1) The stuff before the arrow is referred to as the “reactants” or “reagents”, and the stuff after the arrow is called the “products.” 2) The number of atoms of each element is the same on both sides of the arrow. Even though there may be different numbers of molecules, the number of atoms of each element needs to remain the same to obey the law of conservation of mass. 3) The numbers in front of the formulas tell you how many molecules or moles of each chemical are involved in the reaction. 4) Equations are nothing more than chemical recipes. -
Steel Production Through Electrolysis: Impacts for Electricity Consumption 0, 0, 75
Font Family: Benton Sans 131, 176, 70 Steel production through electrolysis: impacts for electricity consumption 0, 0, 75 204, 102, 51 Adam Rauwerdink 144, 144, 144 VP, Business Development October 18, 2019 Font Family: A 3,000 year old formula Benton Sans Iron Ore Carbon (Coal) Iron Carbon Dioxide 131, 176, 70 Fe2O3 C Fe CO2 0, 0, 75 204, 102, 51 >2 144, 144, 144 Gt CO2 per year (8% of global emissions) Iron Age 1000 BC Digital Age 2019 2 Boston Metal | 2019 Font Family: Steel in 2018 Benton Sans 131, 176, 70 Aluminium is #2 at 1,800 64 million tonnes 0, 0, 75 million tonnes 204, 102, 51 70% 30% 144, 144, 144 Integrated Steel Mill Mini Mill (Iron ore new steel units) (Scrap recycled steel units) Source: World Steel Association 3 Boston Metal | 2019 Font Family: Integrated steel mill: material flow Benton Sans 131, 176, 70 0, 0, 75 204, 102, 51 144, 144, 144 4 Boston Metal | 2019 Font Family: Molten oxide electrolysis (MOE) is emissions free Benton Sans Molten Oxide Electrolysis (MOE) 131, 176, 70 Iron Ore Electricity Iron Oxygen 0, 0, 75 - Fe2O3 e Fe O2 204, 102, 51 144, 144, 144 No carbon in the process = No CO2 emitted Electricity decarbonization eliminates/reduces indirect emissions! 5 Boston Metal | 2019 Font Family: Changing the formula from coal to electricity Benton Sans Iron Ore Carbon (Coal) Iron Carbon Dioxide 131, 176, 70 Fe2O3 C Fe CO2 0, 0, 75 204, 102, 51 Molten Oxide Electrolysis (MOE) 144, 144, 144 Iron Ore Electricity Iron Oxygen - Fe2O3 e Fe O2 6 Boston Metal | 2019 Font Family: MOE is more energy efficient Benton -
Chemistry - B.S
Chemistry - B.S. College of (Biochemistry Option) Arts and Sciences The Department of Chemistry offers the Bachelor of Science degree for students who Graduation Composition and Communication Requirement intend to become professional chemists or do graduate work in chemistry or a closely (GCCR) related discipline. There are three options in the B.S. program: a traditional track WRD 310 Writing in the Natural Sciences ............................................................. 3 covering all the major areas of chemistry, an option that emphasizes biochemistry and an option in materials chemistry. The Biochemistry and Traditional Options are Graduation Composition and Communication certified by the American Chemical Society. A Bachelor of Arts degree program is Requirement hours (GCCR) .................................................................... 3 offered as well for students who want greater flexibility in the selection of courses to perhaps pursue more diverse degree options, including dual and double majors. For College Requirements all majors CHE 109 and CHE 110 have been defined as equivalent to CHE 105. The I. Foreign Language (placement exam recommended) ................................... 0-14 Department also offers the Master of Science and the Doctor of Philosophy degree. II. Disciplinary Requirements a. Natural Science (completed by Major Requirements) 128 hours b. Social Science ......................................................................................... 3 Any student earning a Bachelor of Science (BS) -
Electrochemistry of Fuel Cell - Kouichi Takizawa
ENERGY CARRIERS AND CONVERSION SYSTEMS – Vol. II - Electrochemistry of Fuel Cell - Kouichi Takizawa ELECTROCHEMISTRY OF FUEL CELL Kouichi Takizawa Tokyo Electric Power Company, Tokyo, Japan Keywords : electrochemistry, fuel cell, electrochemical reaction, chemical energy, anode, cathode, electrolyte, Nernst equation, hydrogen-oxygen fuel cell, electromotive force Contents 1. Introduction 2. Principle of Electricity Generation by Fuel Cells 3. Electricity Generation Characteristics of Fuel Cells 4. Fuel Cell Efficiency Glossary Bibliography Biographical Sketch Summary Fuel cells are devices that utilize electrochemical reactions to generate electric power. They are believed to give a significant impact on the future energy system. In particular, when hydrogen can be generated from renewable energy resources, it is certain that the fuel cell should play a significant role. Even today, some types of fuel cells have been already used in practical applications such as combined heat and power generation applications and space vehicle applications. Though research and development activities are still required, the fuel cell technology is one of the most important technologies that allow us to draw the environment friendly society in the twenty-first century. This section describes the general introduction of fuel cell technology with a brief overview of the principle of fuel cells and their historical background. 1. Introduction A fuel cellUNESCO is a system of electric power – generation,EOLSS which utilizes electrochemical reactions. It can produce electric power by inducing both a reaction to oxidize hydrogen obtained by reforming natural gas or other fuels, and a reaction to reduce oxygen in the air, each occurringSAMPLE at separate electrodes conne CHAPTERScted to an external circuit. -
Teaching H. C. Ørsted's Scientific Work in Danish High School Physics
UNIVERSITY OF COPENHAGEN FACULTY OF SCIENCE Ida Marie Monberg Hindsholm Teaching H. C. Ørsted's Scientific Work in Danish High School Physics Masterʹs thesis Department of Science Education 19 July 2018 Master's thesis Teaching H. C. Ørsted’s Scientific Work in Danish High School Physics Submitted 19 July 2018 Author Ida Marie Monberg Hindsholm, B.Sc. E-mail [email protected] Departments Niels Bohr Institute, University of Copenhagen Department of Science Education, University of Copenhagen Main supervisor Ricardo Avelar Sotomaior Karam, Associate Professor, Department of Science Education, University of Copenhagen Co-supervisor Steen Harle Hansen, Associate Professor, Niels Bohr Institute, University of Copenhagen 1 Contents 1 Introduction . 1 2 The Material: H. C. Ørsted's Work . 3 2.1 The Life of Hans Christian Ørsted . 3 2.2 Ørsted’s Metaphysical Framework: The Dynamical Sys- tem............................. 6 2.3 Ritter and the failure in Paris . 9 2.4 Ørsted’s work with acoustic and electric figures . 12 2.5 The discovery of electromagnetism . 16 2.6 What I Use for the Teaching Sequence . 19 3 Didactic Theory . 20 3.1 Constructivist teaching . 20 3.2 Inquiry Teaching . 22 3.3 HIPST . 24 4 The Purpose and Design of the Teaching Sequence . 27 4.1 Factual details and lesson plan . 28 5 Analysis of Transcripts and Writings . 40 5.1 Method of Analysis . 40 5.2 Practical Problems . 41 5.3 Reading Original Ørsted's Texts . 42 5.4 Inquiry and Experiments . 43 5.5 "Role play" - Thinking like Ørsted . 48 5.6 The Reflection Corner . 51 5.7 Evaluation: The Learning Objectives . -
Chemical Matter: Elements and Their Classification Through the Periodic System - Renato Ugo
FUNDAMENTALS OF CHEMISTRY – Vol. I - Chemical Matter: Elements and Their Classification Through the Periodic System - Renato Ugo CHEMICAL MATTER: ELEMENTS AND THEIR CLASSIFICATION THROUGH THE PERIODIC SYSTEM Renato Ugo Università di Milano, Italy Keywords: chemical elements, electrochemical properties, electron affinities, electronegativity, electronic structure of atoms, ionization energies, metals, nonmetals, periodic table, size of atoms. Contents 1. Introduction 2. Introduction to the Electronic Structure of Atoms 3. The Building Up of the Periodic Table 4. The Periodical Trends of Some Physical Properties 4.1. Ionization Energies 4.2. Size of Atoms 4.3. Electron Affinities 5. Some Periodical Trends of the Chemical Behavior 5.1. From Metals to Nonmetals 5.2. The Binding Energies 5.3. Electronegativity 5.4. The Electrochemical Properties of the Metallic Elements Glossary Bibliography Biographical Sketch Summary The building up of the periodic table of the elements, based on the aufbau principle, Pauli exclusion principle, and Hund’s rule is described and explained on the basis of a preliminary introduction to the electronic structure of atoms. The periodicUNESCO trends of ionization energies, si–zes ofEOLSS atoms, electron affinities, and of the electronegativity of the elements are discussed together with some periodical chemical properties, such as binding energies, electrochemical properties of metals, and the shift along the periodicSAMPLE table from metals to nonmetals. CHAPTERS 1. Introduction Chemistry is an experimental science that involves an enormous number of observations and requires the investigation of all the various aspects of the properties of matter. For such a reason, from the beginning of the development of chemistry as a science at the end of the eighteenth century it was essential to try to rationalize the complexity of the elements’ physical and chemical behavior, which at first sight were completely casual. -
Unit 1 – Atomic Structure and Nuclear Chemistry Introduction to the Atom
Unit 1 – Atomic Structure and Nuclear Chemistry Introduction to the atom Modern Atomic Theory All matter is composed of atoms Atoms cannot be subdivided, created, or destroyed in ordinary chemical reactions. However, these changes CAN occur in nuclear reactions! Every atom has different properties from other atoms Ex: grinding down a gold ring Modern Atomic Theory Wait, it’s “only” a theory? Why are we learning it then? •A theory is a powerful term in science Theory -A set of tested hypotheses that gives an overall explanation of some natural phenomenon. Ex: Cell theory & Evolutionary theory We can now see atoms …sort of In 1981 a STM (Scanning Tunneling Microscope) was created. - We can see them and manipulate them. The Kanji characters for "atom." This image was formed by using the tiny tip of an STM to pick up individual atoms of iron and place them on a copper (111) surface. Nanotechnology is coming Atoms can be moved and molded to make various devices such as molecular motors Structure of the Atom Accessing Prior Knowledge 1. Based on your previous science classes, draw a generic atom and label where you’d find the nucleus, protons, neutrons, & electrons. 2. For a common beryllium atom, what is the: a) # protons? b) # neutrons? c) # electrons? Structure of an Atom Electrons (in electron cloud) 1/2000th the mass of P+ & N Nucleus (protons + neutrons) Particle Charge Mass Location Purpose # Electron -1 0 Electron Behavior of cloud element Proton +1 1 Nucleus Identity of element Neutron 0 1 Nucleus Stability of nucleus Charges in an Atom The atom is generally neutral because: # of negative electrons = # of positive protons The nucleus is positively charged because: Contains positive protons (and neutrons which don’t have a charge). -
BIOCHEMISTRY MAJOR the Biochemistry Major Is Offered Through the Department of Chemistry
BIOCHEMISTRY MAJOR The Biochemistry major is offered through the Department of Chemistry. This sequence is recommended for students planning entry into graduate school in Biochemistry, Pharmacology, or related subjects. It is also strongly recommend for those desiring to pursue medical or dental school. NOTE: This course sequence may be modified to include a Senior Capstone Experience. FIRST YEAR Fall Semester Credits Spring Semester Credits General Chemistry I for Majors (CHE111) 3 General Chemistry II for Majors (CHE112) 3 General Chemistry I Lab for Majors (CHE111L) 1 General Chemistry II Lab for Majors (CHE112L) 1 General Chemistry I Récitation (CHE111R) 0 General Chemistry II Récitation (CHE112R) 0 Precalculus (MAT116 or MAT120) 3-4 Calculus I (MAT231) 4 First Year Composition (ENG103) 4 Foreign Language (FL201) 4 African Diaspora/World I (ADW111) 4 African Diaspora/World II (ADW112) 4 First Year Experience (FYE 101-Chemistry) 1 First Year Experience (FYE 102-Chemistry) 1 First Year Seminar in Chemistry (CHE101) 0 Big Questions Colloquia (BQC) 1 TOTAL HOURS 16-17 TOTAL HOURS 18 SOPHOMORE YEAR Fall Semester Credits Spring Semester Credits Organic Chemistry I for Majors (CHE231) 4 Organic Chemistry II for Majors (CHE232) 4 Organic Chemistry I Lab (CHE233L) 1 Organic Chemistry II Lab (CHE234L) 1 Organic Chemistry I Récitation (CHE233R) 0 Organic Chemistry II Récitation (CHE234R) 0 Biology of the Cell (BIO120) 4 Organismal Form and Function(BIO115) 4 Calculus II (MAT 232) 4 Physics I: Mechanics & Lab (PHY151) 4 Foreign Language (FL202) -
Electrochemistry –An Oxidizing Agent Is a Species That Oxidizes Another Species; It Is Itself Reduced
Oxidation-Reduction Reactions Chapter 17 • Describing Oxidation-Reduction Reactions Electrochemistry –An oxidizing agent is a species that oxidizes another species; it is itself reduced. –A reducing agent is a species that reduces another species; it is itself oxidized. Loss of 2 e-1 oxidation reducing agent +2 +2 Fe( s) + Cu (aq) → Fe (aq) + Cu( s) oxidizing agent Gain of 2 e-1 reduction Skeleton Oxidation-Reduction Equations Electrochemistry ! Identify what species is being oxidized (this will be the “reducing agent”) ! Identify what species is being •The study of the interchange of reduced (this will be the “oxidizing agent”) chemical and electrical energy. ! What species result from the oxidation and reduction? ! Does the reaction occur in acidic or basic solution? 2+ - 3+ 2+ Fe (aq) + MnO4 (aq) 6 Fe (aq) + Mn (aq) Steps in Balancing Oxidation-Reduction Review of Terms Equations in Acidic solutions 1. Assign oxidation numbers to • oxidation-reduction (redox) each atom so that you know reaction: involves a transfer of what is oxidized and what is electrons from the reducing agent to reduced 2. Split the skeleton equation into the oxidizing agent. two half-reactions-one for the oxidation reaction (element • oxidation: loss of electrons increases in oxidation number) and one for the reduction (element decreases in oxidation • reduction: gain of electrons number) 2+ 3+ - 2+ Fe (aq) º Fe (aq) MnO4 (aq) º Mn (aq) 1 3. Complete and balance each half reaction Galvanic Cell a. Balance all atoms except O and H 2+ 3+ - 2+ (Voltaic Cell) Fe (aq) º Fe (aq) MnO4 (aq) º Mn (aq) b. -
Electrolysis Through Magnetic Field for Future Renewable Energy
International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-2S, July 2019 Electrolysis Through Magnetic Field for Future Renewable Energy Asaad Zuhair Abdulameer, Zolkafle Buntat, Rai Naveed Arshad, Zainuddin Nawaw Production of Hydroxide through the electrolysis of water, Abstract: Hydrocarbon fuels are the best source of energy; resolve numerous possible problems of using hydroxide as a however, they have some drawbacks. Because of extensive usage fuel supplement [9, 10]. In this attempt, magnetic field and replacement difficulties, it is not financially possible to electrolysis is a technique of electrolysis that is a more entirely disregard them in the coming days. Hydrogen with Oxygen (hydroxide-HHO) gas as a fuel supplement is one convenient light source to compare with solar energy for possible way to reduce consumption and emissions of commercial electrolysis [11]. Although this process gives a hydrocarbon fuels. However, the accessibility and rate of small proportion of hydrogen production by using the current compressed hydrogen (H2) have made it challenging. Electrolysis method, we believed that this process would contribute a lot of water, resolve numerous possible complications of using to society if the existing methods are upgraded with suitable hydroxide for fuel to progress hydrocarbon burning. This materials and substances. research introduces a new design of electrolyzer with proper selection of electrode material and types integrated with magnetic field system, which can reduce the energy consumption. The effect of the optimum magnetic field strength was measured for this process with tap and distilled water. Two supplementary compounds, Sodium Hydroxide (NaOH) and Soda (NaHCO3), with concentration 3333ppm 1.5 litres of the electrolyte was used in this process. -
The Effect of Magnetic Field on the Dynamics of Gas Bubbles in Water Electrolysis
The Effect of Magnetic Field on the Dynamics of Gas Bubbles in Water Electrolysis Yan-Hom Li ( [email protected] ) Department of Mechanical and Aerospace Engineering, Chung-Cheng Institute of Technology, National Defense University, Taiwan Yen-Ju Chen Department of Mechanical and Aerospace Engineering, Chung-Cheng Institute of Technology, National Defense University, Taiwan Research Article Keywords: gas bubbles, platinum electrodes, magnetic eld result, downward Lorentz forces Posted Date: March 8th, 2021 DOI: https://doi.org/10.21203/rs.3.rs-283081/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Version of Record: A version of this preprint was published at Scientic Reports on April 30th, 2021. See the published version at https://doi.org/10.1038/s41598-021-87947-9. The effect of magnetic field on the dynamics of gas bubbles in water electrolysis Yan-Hom Li1,2,*, Yen-Ju Chen 1,⸸ 1Department of Mechanical and Aerospace Engineering, Chung-Cheng Institute of Technology, National Defense University, Taoyuan, 335, Taiwan, 2System Engineering and Technology Program, National Yang Ming Chiao Tung University, Hsin-Chu, 300, Taiwan *corresponding. hom_li @hotmail.com ⸸these authors contributed equally to this work Abstract In this work, the movement of the gas bubbles evolved from the platinum electrodes in the influence of various magnetic field configurations are experimentally investigated. The oxygen and hydrogen bubbles respectively evolve from the surface of anode and cathode have distinctive behaviors in the presence of magnetic fields due to their paramagnetic and diamagnetic characteristics. The magnetic field perpendicular to the surface of the horizontal electrode induces the revolution of the bubbles. -
Electrolysis of Salt Water
ELECTROLYSIS OF SALT WATER Unit: Salinity Patterns & the Water Cycle l Grade Level: High school l Time Required: Two 45 min. periods l Content Standard: NSES Physical Science, properties and changes of properties in matter; atoms have measurable properties such as electrical charge. l Ocean Literacy Principle 1e: Most of of Earth's water (97%) is in the ocean. Seawater has unique properties: it is saline, its freezing point is slightly lower than fresh water, its density is slightly higher, its electrical conductivity is much higher, and it is slightly basic. Big Idea: Water is comprised of two elements – hydrogen (H) and oxygen (O). Distilled water is pure and free of salts; thus it is a very poor conductor of electricity. By adding ordinary table salt (NaCl) to distilled water, it becomes an electrolyte solution, able to conduct electricity. Key Concepts o Ionic compounds such as salt water, conduct electricity when they dissolve in water. o Ionic compounds consist of two or more ions that are held together by electrical attraction. One of the ions has a positive charge (called a "cation") and the other has a negative charge ("anion"). o Molecular compounds, such as water, are made of individual molecules that are bound together by shared electrons (i.e., covalent bonds). o Essential Questions o What happens to salt when it is dissolved in water? o What are electrolytes? o How can we determine the volume of dissolved ions in a water sample? o How are atoms held together in an element? Knowledge and Skills o Conduct an experiment to see that water can be split into its constituent ions through the process of electrolysis.