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Atomic system and Periodic Table Elements An element is a primaeval inwardness that apprisenot be broken down by chemic means to simplier substances. An element consists entirely of atoms. E.g. H, He, O i.e. every the elements in the Periodic Table. Compounds A compound is a substance cool of elements combined in a fixed proportions. Compounds notify further be broken down into simple units by chemical substance substance means. E.g. 2 water supply (l) ? 2H2(g) + O2(g) Mixtures A mixture is a combination of 2 or more than substances in which the substances retain their identity. A mixture can be separated by physical means. E.g. Air ? H2(l) + O2(l) Symbols of the elements H, He, Li, Be, B, C , N, O, F, Ne, etc.. inclined that we have different elements and that they have different properties and characteristics, e.g. He, S, Fe, what is the amount-go of the difference mingled with onw element with an another? Atomic Theory of Matter any matter consists of minute, undividable particles called atoms which combine unitedly in unhomogeneous ways. E.g. piss, O2, CaCO3 Daltons Atomic Theory 1. Matter is quiet of indiscrete particles called atoms. 2. Atoms of the kindred element have the equal physical and chemical properties. 3. Atoms of different elements have different weights ( smokestackes) 4. Chemical compounds are cool of 2 or more different atoms joined unneurotic in simple, fixed ratios.

The Law of Conservation of Mass In a chemical change, mass is con served ( fundamental mass of reactants = Tot! al mass of products) E.g FeS ? Fe + S 87.8g 55.8 32g reactant (87.8g products) The Law of eonian Composition The same compound, no matter how it is prepared, always contains the same elements combined in the same fixed proportion by mass. E.g.2H2 + O2 ? 2H2O % H in H2O = 11.2 % O in H2O = 88.8 Chemical Formulas...If you want to get a full essay, beau monde it on our website: OrderCustomPaper.com

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