Static electricity: electric charge that builds up on the surface of an object Friction: is the force resisting the relative motion of two surfaces in contact When two objects are rubbed together there is more contact between the surfaces and so more electrons are transferred Electron Affinity: Electron affinity is the tendency of a substance to hold onto electrons. Items high on the list (electrostatic/ triboelectric series) will tend to lose electrons easily (positive) Items low on the list
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Synopsis – Grade 9 Science Term II Chapter 1: Atoms and Molecules Law of conservation of mass: Mass can neither be created nor can it be destroyed in a chemical reaction. Law of constant proportion: A chemical substance always contains the same elements in a fixed proportion by mass‚ irrespective of the source of compound. Atom: The smallest particle which is the building block of matter. The symbol of the element is made from one or two letters of the English
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3.1 & 3.2 Chemistry Notes Dalton * In 1805‚ John Dalton reintroduced the idea to explain 3 fundamental principles Experimental Work * Atoms of different elements have different properties * Law of definite proportion and multiple compositions: atoms of 2 or more elements can combine in a fixed ratio to form new substances depending on their combining capacities (eg. H2O vs H2O2) * Law of conservation of mass: atoms cannot be created or destroyed during a chemical reaction
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Biochemistry Essential Elements of Life Carbon‚ hydrogen‚ oxygen‚ nitrogen (96%) Calcium‚ phosphorus‚ potassium‚ sulphur (4%) Isotopes Atoms of an element that differ in neutrons Radioactive isotopes decay spontaneously‚ giving off energy Cohesion Hydrogen bonds hold water molecules together Adhesion is an attraction between two substances Surface tension measures how hard it is to break the surface tension of a liquid Hydrocarbons Organic molecules consisting of only carbon
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Lord And Lady Of The Manor * Lived in the best house of the manor and had servants to care for them * Several rooms * Walls draped with tapestries to keep out the cold * Every room had furniture * No electricity or plumbing * Enjoyed having expensive things that depicted their status * Lords also had obligations to look after. * Had to keep contract with vassal * Had to marry and have children * No children meant the vassal could take back land
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Chapter 11 - The Periodic Table 11-1 Organizing by Properties Dmitri Mendeleev (1834-1907) russian‚ published his element classification in 1869 - increasing molar mass - matching similar properties Mendeleev’s periodic table included gaps - yet to be discovered - predicted the properties of missing elements repetition in properties of the elements was a fundamental pattern in nature - periodicity of the elements modern periodic law: the properties of the elements recur periodically when
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To Grade or Not to Grade Jamie Potts Baker College of Jackson To Grade or not to Grade Sweaty hands‚ racing heartbeat‚ trouble breathing. These are a few of the things some students may experience right before‚ or even during a test. Jerry Farber brings some very interesting alternatives to testing and to the whole grading process in an article he wrote called‚ “A young person’s guide to the grading system”. (Farber 1969) In A young persons guide to the grading system (Farber 1969) Farber
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Accounts Receivable: an amount due from another party two of the most common are: Accounts Receivable &Notes Receivable others are: interest receivable‚ rent receivable‚ tax refund receivable‚ and receivables from employees Accounts Receivable- are amounts due from customers for credit sales when a company does extend credit directly to customers it: 1. Maintains a separate account receivable for each customer 2. accounts for bad debts from credit sales Recognizing Accounts Receivable:
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Chapter 9 P192-211 Civilization in Eastern Europe: Byzantium and Orthodox Europe Introduction: BIG IDEAS DETAILS One: Two major Christian civilizations took shape- the orthodox Christian Byzantine & Catholicism in Central and West Europe- yet the remained mostly different Two: Expansion into areas never controlled before • Both new civilizations were impacted by Islam o They had Different principles • Byzantine places a higher stress on politics‚ economy‚ and cultural life (from
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World Religions Report Dave Clanton Axia College Student of University of Phoenix Introduction The church itself is not too unlike other churches in the community‚ aesthetically it has a warm‚ inviting appeal to it‚ not too small‚ but of a fair size. Reinaldo does not agree with the American versions of the Pentecost‚ and does not attend a Pentecostal church here in the U.S. When I finally met Ray‚ I was impressed with his abilities as welder and saw that he had mechanical abilities
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