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Lecture 2.2- Mixtures


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Section 2.2 Lecture for Honors & Prep Chemistry on Mixtures

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Lecture 2.2- Mixtures

  1. 1. <ul><li>Bellwork – states o’ matter </li></ul><ul><li>Draw pictures of the three states of matter at the submicroscopic level. </li></ul><ul><li>Devise a way to separate sand from a mixture of charcoal, sand, sugar, and water. </li></ul>
  2. 2. Classifying Mixtures <ul><ul><ul><li>A mixture is a physical blend of two or more components. </li></ul></ul></ul><ul><ul><ul><ul><li>A salad bar provides a range of items. Customers choose how much of each item to use in their salads. Each salad has a different composition. </li></ul></ul></ul></ul>
  3. 3. Substance = definite composition Mixture = composition may vary Classifying Mixtures
  4. 4. <ul><ul><li>Mixtures can be classified as heterogeneous mixtures or as homogeneous mixtures. </li></ul></ul>Classifying Mixtures
  5. 5. <ul><ul><ul><li>A mixture in which the composition is not uniform throughout is a heterogeneous mixture. </li></ul></ul></ul><ul><ul><ul><li>Hetero = different </li></ul></ul></ul>Classifying Mixtures
  6. 6. <ul><ul><ul><li>A mixture in which the composition is the same throughout is a homogeneous mixture . </li></ul></ul></ul><ul><ul><ul><li>Another name for a homogeneous mixture is a solution. </li></ul></ul></ul><ul><ul><ul><li>Homo = same </li></ul></ul></ul>Classifying Mixtures
  7. 7. <ul><ul><ul><li>The term phase is used to describe any part of a sample with uniform composition and properties. </li></ul></ul></ul><ul><ul><ul><ul><li>A homogenous mixture consists of a single phase. </li></ul></ul></ul></ul><ul><ul><ul><ul><li>A heterogeneous mixture consists of two or more phases. </li></ul></ul></ul></ul>Classifying Mixtures
  8. 8. <ul><ul><ul><li>When oil and vinegar are mixed they form layers, or phases. </li></ul></ul></ul><ul><ul><ul><li>The oil phase floats on the water phase. </li></ul></ul></ul>Classifying Mixtures
  9. 9. Separating Mixtures <ul><ul><li>Differences in physical properties can be used to separate mixtures. </li></ul></ul>
  10. 10. <ul><ul><ul><li>The process that separates a solid from a liquid is called filtration . </li></ul></ul></ul>Separating Mixtures
  11. 11. <ul><ul><ul><li>During a distillation , two liquids are separated by using their difference in boiling temperature. </li></ul></ul></ul>Separating Mixtures