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nuclear system and periodical Table Elements An instalment is a cardinal substance that apprisenot be rugged raven by chemic means to simplier substances. An element consists all of atoms. E.g. H, He, O i.e. all the elements in the Periodic Table. Compounds A change is a substance sang-froid of elements combined in a fixed proportions. Compounds can elevate be broken down into simple units by chemical substance substance means. E.g. 2 water supply supply (l) ? 2H2(g) + O2(g) Mixtures A mixing is a combination of 2 or much substances in which the substances retain their identity. A mix can be dislocated by physical means. E.g. nimbus ? H2(l) + O2(l) Symbols of the elements H, He, Li, Be, B, C , N, O, F, Ne, etc.. Given that we deliver divers(prenominal) elements and that they defecate antithetical properties and characteristics, e.g. He, S, Fe, what is the amount-go of the difference between onw element with an another? Atomic supposition of Matter All matter consists of minute, undividable particles called atoms which combine unitedly in various ways. E.g. body of water, O2, CaCO3 Daltons Atomic Theory 1. Matter is quiet of inseparable particles called atoms. 2. Atoms of the kindred element have the aforementioned(prenominal) physical and chemical properties. 3. Atoms of different elements have different weights ( smokestackes) 4. Chemical compounds are constitute of 2 or more different atoms joined to belongher in simple, fixed ratios.

The justice of Conservation of Mass In a chemical change, softwood is keep (Total mass of reactants = Total mass of products) E.g FeS ? Fe + S 87.8g 55.8 32g reactant (87.8g products) The jurisprudence of Constant Composition The akin compound, no matter how it is prepared, always contains the same elements combined in the same fixed proportion by mass. E.g.2H2 + O2 ? 2 urine % H in H2O = 11.2 % O in H2O = 88.8 Chemical Formulas...If you want to get a full essay, dictate it on our website: Ordercustompaper.com

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