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Heats Of Reactions
- 1. HEATS OF REACTIONS · MIREIA JIMÉNEZ ROSÉS · DAVID VÁZQUEZ CALDERERO ·
- 4. EXPERIMENT 1 MATERIALS THERMOMETER SPATULA GRADUATE CYLINDER TEST TUBE TEST TUBE RACK POWER ZINC HYDROCHLORIC ACID
- 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. EXPERIMENT 2 MATERIALS SODIUM HYDROGENCARBONATE CITRIC ACID TEST TUBE TEST TUBE RACK THERMOMETER SPATULA GRADUATECYLINDER
- 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. 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. END