Changing matter

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Changing matter

  1. 1. Changing Matter <ul><li>Matter can be changed two ways: </li></ul><ul><ul><li>Physically </li></ul></ul><ul><ul><ul><li>Physical reaction </li></ul></ul></ul><ul><ul><ul><li>Physical change </li></ul></ul></ul><ul><ul><li>Chemically </li></ul></ul><ul><ul><ul><li>Chemical reaction </li></ul></ul></ul><ul><ul><ul><li>Chemical change </li></ul></ul></ul>
  2. 2. Physical Changes <ul><li>Do NOT CHANGE THE TYPE OF MATTER </li></ul><ul><ul><li>Nothing new or different is formed </li></ul></ul><ul><ul><li>Could be a change in: </li></ul></ul><ul><ul><ul><li>Mass </li></ul></ul></ul><ul><ul><ul><li>Volume </li></ul></ul></ul><ul><ul><ul><li>Hardness </li></ul></ul></ul><ul><ul><ul><li>Color </li></ul></ul></ul><ul><ul><ul><li>Density </li></ul></ul></ul>
  3. 3. How to Recognize a Physical Change <ul><li>Change in. . . </li></ul><ul><ul><li>Size </li></ul></ul><ul><ul><li>Shape </li></ul></ul><ul><ul><li>State </li></ul></ul>
  4. 4. Examples of Physical Changes <ul><li>Boiling </li></ul><ul><li>Freezing </li></ul><ul><li>Dissolving </li></ul><ul><li>Breaking </li></ul><ul><li>Making a mixture </li></ul><ul><ul><li>2 or more types of matter (substances) mixed together </li></ul></ul><ul><ul><ul><li>Not in specific amounts </li></ul></ul></ul><ul><ul><ul><li>Can be separated physically </li></ul></ul></ul>
  5. 5. Chemical Properties <ul><li>Describes how a substance reacts </li></ul><ul><li>Examples: </li></ul><ul><ul><li>What happens when it’s burned? </li></ul></ul><ul><ul><li>What happens when it’s mixed with vinegar? </li></ul></ul>
  6. 6. Chemical Changes <ul><li>Evidence of a chemical reaction </li></ul><ul><ul><li>Formation of gas (bubbles form) </li></ul></ul><ul><ul><li>Formation of precipitate (new substance) </li></ul></ul><ul><ul><li>Change in color </li></ul></ul><ul><ul><li>Change in energy (heat and light) </li></ul></ul><ul><ul><ul><li>Endothermic </li></ul></ul></ul><ul><ul><ul><ul><li>Absorbs heat energy (gets cold) </li></ul></ul></ul></ul><ul><ul><ul><li>Exothermic </li></ul></ul></ul><ul><ul><ul><ul><li>Releases heat energy (gets hot) </li></ul></ul></ul></ul>
  7. 7. Examples of a Chemical Change <ul><li>Burning anything </li></ul><ul><li>Rusting </li></ul><ul><li>Tarnishing </li></ul><ul><li>Baking a cake </li></ul><ul><li>Frying eggs </li></ul>
  8. 8. Chemical Changes <ul><li>Atoms are re-arranged, NOT created or destroyed </li></ul><ul><ul><li>Law of Conservation of Matter </li></ul></ul><ul><ul><li>Law of Conservation of Mass </li></ul></ul>
  9. 9. Chemical Changes <ul><li>Matter is conserved  type of atoms does not change </li></ul><ul><ul><li>Nothing is created or destroyed </li></ul></ul><ul><li>Mass is conserved  amount of atoms cannot change </li></ul><ul><ul><li>Nothing is created or destroyed </li></ul></ul>
  10. 10. Chemical Changes <ul><li>To show conservation of mass  Balance equations </li></ul><ul><ul><li>Make sure there are the same number of each type of atom in the products and in the reactants </li></ul></ul>
  11. 11. Balancing Equations <ul><li>The equation for the burning of methane gas in oxygen is: </li></ul><ul><ul><li>CH 4 + 2 O 2 -> CO 2 + 2 H 2 O </li></ul></ul>Subscript Shows # of atoms Coefficient Shows # of molecules
  12. 12. Balanced Equation <ul><li>CH 4 + 2 O 2 -> CO 2 + 2 H 2 O </li></ul><ul><li>Reactants Products </li></ul><ul><li>(Original Substances) (New Substances Formed) </li></ul>
  13. 13. Types of Chemical Reactions <ul><li>Synthesis Reaction 2 or more simple substances combine to form a more complex substance. </li></ul><ul><li>A+B  AB </li></ul><ul><li>Decomposition Reaction </li></ul><ul><ul><li>A more complex substance breaks down into its more simple parts </li></ul></ul><ul><ul><li>AB  A + B </li></ul></ul>
  14. 14. Types of Chemical Reactions <ul><li>Replacement Reactions </li></ul><ul><li>AB + CD  AD + C B </li></ul>

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