Classifying matter

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Classifying matter

  1. 1. Do Now <ul><li>What is the difference between a compound such as water and a mixture such as salsa? </li></ul>
  2. 2. Classifying Matter
  3. 3. Goals: <ul><li>To classify pure substances as elements or compounds. </li></ul><ul><li>To distinguish between pure substances and mixtures. </li></ul><ul><li>To classify mixtures as heterogeneous or homogeneous. </li></ul>
  4. 4. Materials can be divided into pure substances and mixtures , depending on their composition.
  5. 5. Pure substance <ul><li>Matter that has the same composition. </li></ul><ul><li>Every sample is uniform. </li></ul><ul><li>Each part of every sample is the same. </li></ul>
  6. 6. Pure substances can be classified into two categories. The first is an element. <ul><li>Elements cannot be broken down into simpler substances. </li></ul><ul><li>They contain only one type of atom. </li></ul>
  7. 7. When two or more elements chemically join together in a fixed proportion, they form a compound. <ul><li>Example: WATER </li></ul><ul><li>Hydrogen is a gas at room temperature and so is Oxygen. But when combined together, they form water – a liquid at room temperature. </li></ul>
  8. 8. A compound can always be broken down into the simpler substances (elements or other compounds) that make it up. <ul><li>Let’s look at our water example again: </li></ul>If you pass electricity through water, hydrogen and oxygen bubbles rise to the surface
  9. 9. Other common examples of compounds: Calcium carbonate-CaCO 3 Citric acid-C 6 H 8 O 7 Sodium chloride-NaCl Hydrogen peroxide-H 2 O 2 Nitrous oxide-N 2 O Ammonia-NH 3
  10. 10. Mixtures <ul><li>A substance consisting of two or more substances mixed together. </li></ul><ul><li>Mixtures retain some of the properties of the original substances. </li></ul><ul><li>The composition of a mixture can vary. Mixtures are classified by how well the parts are distributed. </li></ul>
  11. 11. Heterogeneous mixtures: <ul><li>Comes from “hetero” meaning different and “genus” meaning kind . (the parts of these mixtures are noticeably different from one another. </li></ul>
  12. 12. Homogeneous mixtures: <ul><li>The substances are so evenly distributed that it is difficult to distinguish one substance from another. </li></ul><ul><li>It appears to contain only 1 substance. Stainless steel is made from a homogeneous mixture of iron, chromium, and nickel. </li></ul>
  13. 13. What type of mixture are these?

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