Components of Matter - credits to UPERG freshmen assistance...

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LALaput Chemistry16 Lecture2 Components of Matter 1. Mixtures, Compounds and Elements 2. Law of Conservation of Mass 3. Law of Conservation of Energy 4. Law of Definite Composition 5. Law of Multiple Proportions 6. Dalton’s Atomic Theory 7. Structure of Atoms and Fundamental Particles 8. Atomic Number, Mass Number and atomic Symbol 9. Isotope and atomic masses MIXTURE vs COMPOUNDS MIXTURE - Physically mixed, therefore can be separated by physical means. COMPOUNDS - Allowed to react chemically, therefore cannot be separated by physical means CONSERVATION OF MATTER There is NO observable change in the quantity of matter (mass) during a chemical reaction* or during a physical change. * a nuclear reaction is not a chemical reaction The total mass of substances DOES NOT change during a chemical reaction. LAW OF DEFINITE COMPOSITION Different samples of any pure compound contain the same elements in the same proportions by mass.
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