Scandium is a chemical element with symbol Sc and atomic number 21. A silvery-white metallic transition metal‚ it has historically been sometimes classified as a rare earth element‚ together with yttrium and the lanthanoids. It was discovered in 1879 by spectral analysis of the minerals euxenite and gadolinite from Scandinavia. Scandium is present in most of the deposits of rare earth and uranium compounds‚ but it is extracted from these ores in only a few mines worldwide. Because of the low availability
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Periodic Table Trends: Atomic Radius - half of the distance between the centers of two atoms that are touching each other decreases moving left to right increases moving top to bottom Ionization Energy - energy required to remove an electron increases moving left to right decreases moving top to bottom Electron Affinity - ability to accept an electron alkaline earth elements have low electron affinities halogens have high electron affinities noble gases have electron affinities near zero
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IGCSE PRE-AICE CHEMISTRY 0620 OFFICIAL STUDY GUIDE Notes: To avoid any confusion concerning the symbol for litre‚ dm3 will be used in place of l or litre.Valence electrons are known as valency electrons for this test. Nature of Matter The states of matter are solid‚ liquid‚ and gas‚ in respective order of kinetic energy. State of Matter | Definite Volume | Definite Shape | Solid | Yes | Yes | Liquid | Yes | No | Gas | No | No | Diffusion:
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Chemical Report The chemical I will be writing this report on is oxygen. The name oxygen comes from the Greek word “oxygens‚” which means “acid producer”. Dictionary.com defines oxygen as “a colorless‚ odorless‚ gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature.” Oxygen has many uses today. First‚ oxygen is used by people‚ plants‚ and animals in the respiration process. Tanks of oxygen are used in the healthcare field to treat
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DETERMINATION OF ELECTRODE POTENTIALS N.M. PICART1 and A.J. EDUARDO2 1INSTITUTE OF BIOLOGY‚ COLLEGE OF SCIENCE 2INSTITUTE OF BIOLOGY‚ COLLEGE OF SCIENCE UNIVERSITY OF THE PHILIPPINES‚ DILIMAN‚ QUEZON CITY 1101‚ PHILIPPINES DATE SUBMITTED: 22 APRIL 2015 DATE PERFORMED: 15 APRIL 2015 ANSWERS TO QUESTIONS 1. Discuss the differences between galvanic and electrolytic cells. A galvanic cell uses a spontaneous reaction to generate electrical energy. In the cell reaction‚ some of the difference in
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Professor Oersted Hans Christian Oersted’s Experiment * Hans Christian Oersted performed an important experiment which showed that there was a connection between electricity and magnetism. * When a current was switched on through a wire‚ it made a compass needle turn so that it was at right angles to the wire. * The current had produced a magnetic field strong enough to cause the compass needle to turn. Additional effects due to experiment * It was already known that an electric
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Chapter I: Introduction 1.1 Background of the study Nowadays people are focusing in herbal plants especially those who are common in the environment. One of the examples is the guava plant (Psidium guajava Linn). Based on research this plant is good for healing and treating wounds and other skin infections. So in this project‚ the researcher wants to make a bathing soap out of it. People‚ researchers‚ scientists were focusing to medicinal plants. They want to prove that there are plants that
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Developing Fuels Revision questions and suggested answers 1. Define ΔHfθ and ΔHcθ ΔHfθ the enthalpy change when 1 mole of a compound is formed from its constituent elements in their standard states measured under standard conditions ΔHcθ the enthalpy change when 1 mole of a compound undergoes complete combustion measured under standard conditions 2. Write an equation for the enthalpy of formation of butane C4H10 4C(s) + 5H2(g) C4H10(g) 3. Write an equation for the
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have to check the water for pH levels as well as calcium levels. It works because of the chemical composition of salt‚ which is made up of chlorine and sodium. Within the salt water system is a unit called a salt-chlorine generator‚ which uses electrolysis to generate chlorine by separating the sodium and chlorine molecules in the salt you add to the pool. As the generator unit separates out the chlorine‚ it’s returned to the pool‚ where it keeps the water clean and
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My Project On Bauxite Done By: Sashanya Stewart Acknowledgement I am using this opportunity to express my gratitude to everyone who supported me throughout this Bauxite project. I am thankful for their aspiring guidance‚ invaluably constructive criticism and friendly advice during the project work. I am sincerely grateful to them for sharing their truthful and illuminating views on a number of issues related to the project. I express my warm thanks to mother and sister for their support and
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