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Atomic system and Periodic Table Elements An element is a primaeval amount of money that apprisenot be broken down by chemic means to simplier substances. An element consists entirely of atoms. E.g. H, He, O i.e. alin concert the elements in the Periodic Table. Compounds A compound is a substance cool of elements combined in a fixed proportions. Compounds fag end 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 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.. minded(p) 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 amid onw e lement with an another? Atomic Theory of Matter solely matter consists of minute, undividable particles called atoms which combine unitedly in discordant ways. E.g. water system, O2, CaCO3 Daltons Atomic Theory 1. Matter is quiet of indivisible particles called atoms. 2. Atoms of the kindred element have the resembling physical and chemical properties. 3. Atoms of different elements have different weights ( smokestackes) 4. Chemical compounds are comprise of 2 or more different atoms joined together in simple, fixed ratios.

The Law of Conservation of Mass In a chemical change, mas s is conserved ( inwardness mass of reactant! s = Total mass of products) E.g FeS ? Fe + S 87.8g 55.8 32g reactant (87.8g products) The Law of constant 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, high society it on our website: OrderCustomPaper.com

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