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Atomic system and Periodic Table Elements An element is a primaeval perfume that apprisenot be broken down by chemic means to simplier substances. An element consists entirely of atoms. E.g. H, He, O i.e. completely the elements in the Periodic Table. Compounds A compound is a substance cool of elements combined in a fixed proportions. Compounds house further be broken down into simple units by chemic substance means. E.g. 2 water supply (l) ? 2H2(g) + O2(g) Mixtures A mixture is a combination of 2 or more 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.. wedded 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 betwixt onw element with an an other? Atomic Theory of Matter in all matter consists of minute, undividable particles called atoms which combine unitedly in different ways. E.g. piss, O2, CaCO3 Daltons Atomic Theory 1. Matter is quiet of inseparable particles called atoms. 2. Atoms of the kindred element have the equivalent physical and chemical properties. 3. Atoms of different elements have different weights ( smokestackes) 4. Chemical compounds are serene of 2 or more different atoms joined together in simple, fixed ratios.

The Law of Conservation of Mass In a chemical change, mass is conserved ( bring ma ss of reactants = Total mass of products) ! E.g FeS ? Fe + S 87.8g 55.8 32g reactant (87.8g products) The Law of unvarying 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, target it on our website: OrderCustomPaper.com

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