Lecture 2.2- Mixtures

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Section 2.2 Lecture for Honors & Prep Chemistry on Mixtures

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  • You can choose the amount of each item you select from a salad bar. So your salad is unlikely to have the same composition as other salads containing the same items.
  • Olive oil and vinegar are homogeneous mixtures. The substances in these mixtures are evenly distributed. When olive oil is mixed with vinegar, they form a heterogeneous mixture with two distinct phases.
  • A colander is used to separate pasta from the water in which it was cooked. This process is a type of filtration.
  • A distillation can be used to remove impurities from water. As liquid water changes into water vapor, substances dissolved in the water are left behind in the distillation flask. Inferring What can you infer about the boiling points of substances dissolved in the impure water?
  • 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

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