light seems to come on almost immediately‚ giving the impression that the electrons in the wiring move very rapidly. Part A: In reality‚ the individual electrons in a wire move very slowly through wires. A typical speed for an electron in a battery circuit is 5.0x10 to the -4th meters per second. How long does it take an electron moving at that speed to travel a wire 1.0 centimeter‚ or 1.0x10 to the -2nd? Part B: Electrons move quickly through wires‚ but electric energy does. It moves at almost
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(or a group) gain or loses electrons. (It has an electric charge due to the imbalance and since they need to neutralise each other.) An ionic bond is a bond that transfers from one and another‚ resulting in an attraction between oppositely charged ions. Sodium chloride (NaCl) is a compound of a metal (Sodium) and a non-metal (Chlorine) join together‚ the sodium being positively charged and the chlorine being negatively charged. In this reaction‚ Sodium gives electrons to the Chlorine (which turns
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of one or more electrons from a metal onto a non-metal. Characteristics of both bonds: * Occur between 2 atoms * Composed of 2 electrons * Have both ionic and covalent characteristics * Together = 100% * Both bonds are measured on an electronegativity scale * Both contain a nonmetal * Chemical bonds * Are determined by using the “magic number” (1.67) * Have bond angle and bond axis Characteristics of metallic bonds: * In metals (d-block electrons only..because of
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3P91 X-ray fluorescence Electron Diffraction Professor: Dr. F. Razavi Lab Demonstrator: J. Korobanik Lab Partner: Adam Kober Author : Jasper D’Agostino SN : 4656534 Contents 1 Introduction 1.1 X-ray fluorescence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 Electron diffraction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Discussion 2.1 X-ray fluorescence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Electron diffraction . . . . . .
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the number of protons and neutrons a.b. The sum of the number of protons‚ neutrons‚ and electrons. a.c. The sum of the number of the neutrons and electrons. a.d. The sum of the number of the electrons and protons. 6) (3 points) Determine the number of protons‚ neutrons‚ and electrons in: C 7) (3 points)Determine the number of protons‚ neutrons‚ and electrons in: 8) (3 points) Write the name and the symbol of the element with the
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usually formed between a metal and a non-metal‚ Covalent between two non-metals and Metallic between two metals. Ionic Bonding; Ionic bonds tend to form between metals whose atoms need to “loose” electrons to gain the nearest noble gas configuration and non-metals that need to gain electrons. These electrons are transferred from one atom to another. This gives one ion a positive charge and the other a negative one. The Opposite charges in the ion hold them together in a regular three dimensional
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Chemistry: It is the science concerned with the atomic composition of substances‚ elements and their interactions‚ and the formation‚ decomposition and properties of molecules. -Biological chemistry or Biochemistry is the biological or physiological chemistry of living organisms and of the chemical changes occurring therein. Structure of Matter: All living and nonliving things are composed of matter. Matter; is anything that occupies space and has mass. Mass is the amount of matter in an object
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others. As long as I use the same type of metal for each wire‚ my experiment will remain fair. Cross Sectional Area The thicker the wire‚ the less resistant it is. This is because there are more electrons in the metal that are free to move as a current. Also‚ there is more space for the electrons to flow‚ so more can fit down. This is often compared to water in a pipe; the thicker the pipe‚ the more water that can flow through it. Temperature The temperature of the wire also affects the
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CGHS Physics Trial HSC Examination 2008 Page 1 Student number ……………………….. Teacher …………………………………….. Cheltenham Girls High School 2008 Higher School Certificate Trial examination Physics TASK WEIGHTING: 35% General Instructions • Reading time – 5 minutes • Working time – 3 hours • Write using black or blue pen • Draw diagrams using pencil • Board-approved calculators may be used • A data-sheet‚ formulae sheets and Periodic Table are provided at the back of this paper Total marks –
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4/5/’013 | | BOHR THEORY Introduction Niels Bohr applies quantum theory Rutherford’s Atomic Structure by assuming that electrons travel in stationary orbits defined by their angular momentum. This led to the calculation of possible energy levels for these orbits and the postulation that the emission of light occurs when an electron moves into a lower energy orbit. Atomic Spectrum The Atomic Spectrum is a series
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