Chemistry Unit2 Part3 - Elements Compounds and Mixtures

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Chemistry Unit2 Part3 - Elements Compounds and Mixtures

  1. 1. Matter and change Unit 2 Part 3 – Elements, Compounds, and Mixtures
  2. 2. TAKS Student Expectation <ul><li>Integrated Physics and Chemistry (7) Science Concepts. The Student knows the relationship between properties and its components. The Student is expected to: </li></ul><ul><ul><li>(E) Classify samples of matter from everyday life as begin element, compounds, or mixtures. </li></ul></ul>
  3. 3. Mixtures <ul><li>Mixture – two or more substance that can be separated by physical means </li></ul>
  4. 4. <ul><li>Physical types of separation </li></ul><ul><ul><li>Filtration to separate a solid from a liquid. </li></ul></ul>
  5. 5. <ul><ul><li>Distillation to separate a pure liquid from dissolved solid impurities which have a very high boiling point. </li></ul></ul>
  6. 6. <ul><ul><li>Fractional distillation to separate liquids with a range of different boiling points, especially if relatively close together. </li></ul></ul>
  7. 7. <ul><ul><li>Evaporation to remove a solvent to leave a solid behind. </li></ul></ul><ul><ul><li>Crystallization to get a pure solid out of a solvent solution of it. </li></ul></ul>
  8. 8. <ul><ul><li>Chromatography – separate mixtures based on the different masses of substances. </li></ul></ul>
  9. 9. <ul><li>Types of mixtures </li></ul><ul><ul><li>Heterogeneous – suspensions, colloids </li></ul></ul><ul><ul><li>Homogeneous – solutions </li></ul></ul>
  10. 10. Pure Substances <ul><li>Pure - only one substance is present in the material. </li></ul><ul><li>Has a constant (fixed) melting and boiling point. </li></ul>
  11. 11. Compounds <ul><li>Compound – a pure substance that cannot be broken down by physical change, but can be broken down by chemical change. </li></ul><ul><li>2 Types </li></ul><ul><ul><li>Molecules – atoms of the compounds share electrons. </li></ul></ul><ul><ul><li>Formulas – atoms in the compound exchange electrons. </li></ul></ul>
  12. 12. <ul><li>Compounds obey the Law of Definite Proportion </li></ul><ul><ul><li>1794 - John Louis Proust (France) publishes work. Accepted by scientific community in 1811. </li></ul></ul><ul><ul><li>Law states in a pure compound, the elements combine in definite proportions to each other by mass </li></ul></ul><ul><ul><ul><li>Ex: water is always 88.81% Oxygen to 11.19% Hydrogen </li></ul></ul></ul>
  13. 13. Elements <ul><li>element – a substance that cannot be broken down into other substances by chemical change or a physical change. </li></ul><ul><li>Elements typically contains only one kind of an atom. (although certain compounds, like oxygen, can be a compound of itself) </li></ul><ul><li>All known elements are listed on the Periodic Table. </li></ul>
  14. 14. Putting it all together <ul><li>Draw the following diagram which ties together mixtures and pure substances </li></ul>

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