University of Guyana Faculty of Natural Sciences Department of Chemistry CHM 222- Physical Chemistry (2012) Lecturer: Mr. Patrick Ketwaru Assignment # 2 Corrosion of Metals Table of Contents Assignment Question Discuss the process of corrosion of metals‚ the various forms of corrosion and the implications (technical‚ economic‚ social‚ etc.) of corrosion in current society both locally and on a worldwide scale. Introduction
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PART I CHAPTER III DIODES APPLICATIONS –SPECIAL PURPOSE DIODES OBJECTIVES 3.1 I-V- characteristics of normal and zener diode and measurement of static and dynamic resistance 3.2 I-V characteristics on CRO 3.3 Clipping circuits using diodes 3.4 Clamping circuits using diodes 3.5 Diode as a voltage multiplier 3.6 Diode used as a meter over current protection INTRODUCTION SEMICONDUCTORS Semiconductors are materials which are used to manufacture all electronic and optoelectronic devices
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Core 1 summary notes 1) Fossils fuels provide both energy & raw materials such as ethylene‚ for production of other substances Identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum Catalytic cracking is the process whereby high molecular weight fractions are broken down to low molecular weight ones. This process is used in petroleum refineries where crude oil is broken down to smaller alkenes and alkanes‚ until ethene‚ propene‚
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also had a theory that atoms are in and could not be created nor destroyed and they can’t be divided into smaller sections. Eugen Goldstein was a physicist‚ who experimented with electrical discharge tube by passing an electric current between an anode and a cathode surrounded by gas at a
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Corrosion of Metals Introduction Have you ever had a bike that went rusty‚ figure 1? If the paint is scratched and the rust allowed to spread‚ it is very difficult to repair the frame so it looks as good as new again. Rusting costs us millions of pounds each year‚ either through replacing things or through trying to prevent it happening in the first place. Figure 1: Bike rusting. In this booklet you learn about rusting and ways of stopping it‚ followed by a look at another metal‚ aluminium that
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voltage to create a magnetic field that deflects the beam away from the center line)‚ and a phosphorus screen (which illuminates when the beam comes in contact with it). The electron source contains an electrically heated filament (cathode) and an anode to create an electron source and control the intensity (brightness) of an electron beam. Between the two‚ is the accelerating voltage (?Va). This voltage determines the velocity of the electron beam. The electrons then pass through the magnetic coil
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CAWANGAN PULAU PINANG SKEMA JAWAPAN MODUL LATIHAN BERFOKUS SPM 2013 KIMIA KERTAS 1 454111 www. myschoolch ild ren .com ::‚ Muat turun (percuma) soalan lain di : www.myschoolchildren.com Muat turun (percuma) skema lain di www.myschoolchildren.com MAJLIS PENGETUA SEKOLAH MALAYSIA 1 1 B 11 D 21 B 31 C 41 A 2 D 12 B 22 A 32 A 42 A 3 D 13 D 23 D 33 B 43 D 4 A 14 B 24 C
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Pineda‚ Carlitos Miguel Ponce M. January 9‚ 2013 AIT2A Natural Science 12 ATOM DEVELOPMENT WITH SCIENTISTS INVOLVED 400 B.C. - Democritus’ atomic theory posited that all matter is made up small indestructible units he called atoms. Democritus expanded the idea to state that matter was composed of small particles called "atoms" that could be divided no further. These atoms were all composed of the same primary matter with the only differences between them being their size‚ shape
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NIGHT VISION TECHNOLOGY ABSTRACT A night vision device (NVD) is an optical installment that allows images to be produced in levels of light approaching total darkness. They are most often used by the military and law enforcement agencies‚ but are available to civilian users. The term usually refers to a complete unit‚ including an image intensifier tube‚ a protective and generally water-resistant housing‚ and some type of mounting system. Many NVDs also include sacrificial lenses‚ IR illuminators
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Semiconductor The diode – A diode is an electronic component which allows electric current to glow in only one direction. Diodes are constructed from semiconductors. The anode is the positive terminal and the cathode the negative terminal. LED= light emitting diode a diode which emits light. Semiconductor materials Silicon is the most commonly used semiconductor in electronics‚ germanium is also used. These elements form a stable crystal lattice‚ with each atom sharing its four outer electrons
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