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Welcome to wild science!


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Welcome to wild science!

  1. 1. Welcome to Wild Science!
  2. 2. Safety Considerations <ul><li>Follow all instructions. </li></ul><ul><li>Begin any investigation </li></ul><ul><li>only when instructed to do so. </li></ul><ul><li>Show respect for the lab tools – handle carefully. </li></ul><ul><li>Do not taste or smell any substance . </li></ul><ul><li>Be safe. Report an accident or a spill. </li></ul><ul><li>Wash hands thoroughly after the investigation. </li></ul>
  3. 3. Today we will explore… <ul><li>Chemical Reactions </li></ul>
  4. 4. What do we know about… <ul><li>… chemical reactions? </li></ul><ul><li>What makes a </li></ul><ul><li>Reaction a </li></ul><ul><li>Chemical One? </li></ul>
  5. 5. Let’s Observe! <ul><li>We’ll be using the following chemicals today: </li></ul><ul><li>1.Calcium Chloride (CaCl 2 ) </li></ul><ul><li>2.Baking Soda (NaHCO 3 ) </li></ul><ul><li>Phenol Red Solution </li></ul><ul><li>3.Phenol Red (C 19 H 14 O 5 S) </li></ul><ul><li>4.Water (H 2 O) </li></ul><ul><li>Write down a few observations of each </li></ul>
  6. 6. Let’s Experiment! <ul><li>Follow our instructions carefully </li></ul><ul><li>Observe carefully, including feeling the bag as the reaction occurs. </li></ul><ul><li>Write down all of these observations on your sheet </li></ul>
  7. 7. A few reaction types: <ul><li>Exothermic – the release of energy ( heat). You feel warmth. </li></ul><ul><li>Endothermic – the absorption of energy ( heat) . You feel cold. </li></ul>
  8. 8. Our Mission: Uncover which two substances reacted to create the exothermic reaction. <ul><li>Choose one solid and one liquid to test. </li></ul><ul><li>Combine them in a Ziploc bag. </li></ul><ul><li>Close tightly and mix. </li></ul><ul><li>Check for an exothermic reaction. </li></ul>
  9. 9. Our Ingredients Again: <ul><li>1.Calcium Chloride (CaCl 2 ) </li></ul><ul><li>2.Baking Soda (NaHCO 3 ) </li></ul><ul><li>Phenol Red Solution </li></ul><ul><li>3.Phenol Red (C 19 H 14 O 5 S) </li></ul><ul><li>4.Water (H 2 O) </li></ul><ul><li>Choose on solid and one liquid </li></ul>
  10. 10. What did we find out?
  11. 11. Exothermic or Endothermic ? <ul><li>In the next two observations, you decide whether it is an exothermic or endothermic reaction taking place. </li></ul>
  12. 12. Copper Chloride Solution and Aluminum <ul><li>Add one pipette of water to the blue copper chloride crystals. </li></ul><ul><li>Use stir stick to dissolve into a solution. </li></ul><ul><li>Drop the square of aluminum onto the solution. </li></ul><ul><li>Observe – which is it – exo or endo ? </li></ul>
  13. 13. Ammonium Chloride and H 2 O <ul><li>Add two pipettes of room temperature (21 degrees Celsius) water to the test tube containing the ammonium chloride. </li></ul><ul><li>Gently stir with your thermometer. </li></ul><ul><li>Observe what happens to the temperature of the water. </li></ul><ul><li>Which is it – exo or endo ? </li></ul>