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Heats Of Reactions

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Heats Of Reactions

  1. 1. HEATS OF REACTIONS · MIREIA JIMÉNEZ ROSÉS · DAVID VÁZQUEZ CALDERERO ·
  2. 2. <ul><li>INTRODUCTION & SAFETY </li></ul><ul><li>EXPERIMENT 1 </li></ul><ul><li>EXPERIMENT 2 </li></ul><ul><li>QUESTIONS </li></ul>MENU
  3. 3. INTRODUCTION <ul><li>SOME REACTIONS GIVE OUT HEAT AND OTHER TAKE IN HEAT. </li></ul><ul><li>IN EXOTHERMIC REACTIONS , THE TEMPERATURE GOES UP BECAUSE IT TRANSFERS HEAT FROM THE SURROUNDINGS. </li></ul><ul><li>IN ENDOTHERMIC REACTIONS , THE TEMPERATURE GOES DOWN BECAUSE IT ABSORBS HEAT FROM THE SORROUNDINGS. </li></ul><ul><li>WEAR EYE PROTECTION TO CARRY OUT THE NEXT EXPERIMENTS. </li></ul><ul><li>ZINC POWDER IS FLAMMABLE. </li></ul><ul><li>HYDROCHLORIC ACID IS CORROSIVE. </li></ul>SAFETY
  4. 4. EXPERIMENT 1 MATERIALS THERMOMETER SPATULA GRADUATE CYLINDER TEST TUBE TEST TUBE RACK POWER ZINC HYDROCHLORIC ACID
  5. 5. PROCEDURE 1. PUT ABOUT 5 CM 3 OF HYDROCHLORIC ACID. 2. RECORD THE TEMPERATURE OF THE ACID. 3. ADD A SPATULA OF POWDERED ZINC. 4. WATCH WHAT HAPPENS AND RECORD THE TEMPERATURE OF THE SOLUTION.
  6. 6. EXPERIMENT 2 MATERIALS SODIUM HYDROGENCARBONATE CITRIC ACID TEST TUBE TEST TUBE RACK THERMOMETER SPATULA GRADUATECYLINDER
  7. 7. PROCEDURE 1. IN A DRY TEST TUBE MIX ONE SPATULA OF CITRIC ACID AND ONE SPATULA OF SODIUM HYDROGENCARBONATE. 2. PUT 2 CM 3 OF WATER IN ANOTHER TEST TUBE. 3. RECORD THE TEMPERATURE OF THE WATER. 4. ADD THE MIXTURE TO THE WATER. 5. WATCH WHAT HAPPENS AND TAKE THE TEMPERATURE OF THE SOLUTION.
  8. 8. QUESTIONS INFORMATION NOW DO IT: 1. WHICH REACTION IS EXOTHERMIC AND WHICH ENDOTHERMIC? 2. WRITE WORD AND SYMBOL EQUATIONS FOR EXPERIMENT 1. 3. WRITE WORD EQUATION FOR EXPERIMENT 2. The reaction 1 is EXOTHERMIC, because the temperature increase 23.5ºC. The reaction 2 is ENDOTHERMIC, because the temperature decrease 10ºC. Hydrochloric acid + zinc  zinc chloride 2 HCl+ Zn  ZnCl 2 + H 2 Sodium hydrogencarbonate + citric acid  sodium citrate + water + carbon dioxide EXPERIMENT TEMPERATURE OF LIQUID FINAL TEMP. OF MIXTURE TEMPERATURE CHANGE 1 21ºC 44.5ºC +23.5ºC 2 21ºC 12ºC -10ºC
  9. 9. END

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