Unit 2 Notes- Classification of Matter- Komperda

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Unit 2 Notes- Classification of Matter- Komperda

  1. 1. Classification of Matter Friday Sept. 5th, 2008
  2. 2. What is classification? <ul><li>Do you remember classification from biology? </li></ul><ul><li>What does it mean to classify something? </li></ul><ul><li>Why do scientists classify things? </li></ul>
  3. 3. Two classifications of matter <ul><li>Heterogeneous Matter </li></ul><ul><ul><li>Hetero = different </li></ul></ul><ul><ul><li>Heterogeneous matter has parts with different properties </li></ul></ul><ul><ul><ul><li>Often these parts are easy to see </li></ul></ul></ul><ul><ul><ul><li>Examples? </li></ul></ul></ul><ul><ul><ul><ul><li>Cookie Dough </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Salad </li></ul></ul></ul></ul>
  4. 4. Classification of Matter cont. <ul><li>Homogeneous Matter </li></ul><ul><ul><li>Homo = same </li></ul></ul><ul><ul><li>Homogeneous matter has the same properties throughout </li></ul></ul><ul><ul><ul><li>Parts are not visible </li></ul></ul></ul><ul><ul><ul><li>Examples? </li></ul></ul></ul><ul><ul><ul><ul><li>Milk </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Clay </li></ul></ul></ul></ul>
  5. 5. Three General Classes of Matter <ul><li>Elements- pure substances that cannot be further decomposed (broken down) by ordinary chemical methods </li></ul><ul><ul><li>Elements are made of all of the same type of atoms </li></ul></ul><ul><ul><li>Examples? </li></ul></ul><ul><ul><ul><li>Oxygen </li></ul></ul></ul><ul><ul><ul><li>Gold </li></ul></ul></ul><ul><ul><ul><li>Iron </li></ul></ul></ul>
  6. 6. Three Classes of Matter cont. <ul><li>Compound </li></ul><ul><ul><li>A pure substance that can be decomposed (broken down) into two or more simpler substances (elements) by ordinary chemical means </li></ul></ul><ul><ul><li>The properties of a compound are usually different from the properties of the elements that make it up </li></ul></ul><ul><ul><li>Examples </li></ul></ul><ul><ul><ul><li>Water </li></ul></ul></ul><ul><ul><ul><li>Sodium Chloride (table salt) </li></ul></ul></ul>
  7. 7. Three Classes of Matter cont. <ul><li>Mixture </li></ul><ul><ul><li>Two or more substances physically mixed together </li></ul></ul><ul><ul><li>A mixture generally has the same properties as the substances that make it up </li></ul></ul><ul><ul><li>Examples </li></ul></ul><ul><ul><ul><li>Kool-Aid </li></ul></ul></ul><ul><ul><ul><li>Concrete </li></ul></ul></ul><ul><li>A homogeneous mixture is called a solution </li></ul><ul><ul><li>Solutions don’t have to be just liquids </li></ul></ul>

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