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Evidence for an Atomic Theory

Evidence for an Atomic Theory. Review. Atomic Structure Nucleus Protons (+) Neutrons (no charge) Electron Cloud (-). Element Single type of atom Compound Two or more different elements combined chemically & make a new substance Mixture Two or more elements mixed together. Atom

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Evidence for an Atomic Theory

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  1. Evidence for an Atomic Theory

  2. Review • Atomic Structure • Nucleus • Protons (+) • Neutrons (no charge) • Electron Cloud (-) • Element • Single type of atom • Compound • Two or more different elements combined chemically & make a new substance • Mixture • Two or more elements mixed together

  3. Atom Smallest particle of a substance that still has the properties of that substance Indirect Model Used to study things we cannot see Aromatic Substance odor Properties of Atoms Solid, liquids, gases Phase changes Chemical reactions Evaporation Attraction Atoms can change forms Atoms when combined show different properties than the original atoms Lab#13 Evidence for the Existence of Atoms

  4. Lab#14 Analysis of Blue Vitriol • Analysis – break down using heat • Synthesis – combine, proves analysis • Word Equation • Blue vitriol White vitriol + Water • Reactants Products • System Analysis Diagram White vitriol Blue vitriol analysis water

  5. Lab#15 Mass & Components of Blue Vitriol • Reactants – what goes into the reaction (left) • Products – what is made in the reaction (right) - between reactants & product means “yields” • Mass of reactants = mass of products • Law of Conservation of Matter • Matter is never created nor destroyed • Slope – tells the relationship between the x and y axis

  6. Lab #16 Analysis of Water • Electrolysis – break down using electricity • Water Hydrogen + Oxygen • Electrolyte – speeds up the reaction, not used in the reaction • Physical Properties • Property that can be observed without changing the composition of the matter • Gases – color, odor, solubility, flammability, density • Law of Definite Proportions • Matter breaks down in a regular pattern/ratio hydrogen water electrolysis oxygen

  7. Lab#18 Literature on Dalton’s Atomic Theory • Dalton’s Atomic Theory • All matter is made up of atoms. • Atoms of an element are the same. • Atoms of different elements are different. • Properties of atoms don’t change in chemical reactions. • Atoms are neither created nor destroyed in chemical reactions. • Atoms combine in simple whole number ratios to form compounds. • Particles of a compound always contain the same number of atoms of each element present.

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