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Chemistry lab report, Exothermic and Endothermic Reactions

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Introduction

CHEMISTRY LAB REPORT EXOTHERMIC & ENDOTHERMIC REACTIONS Aim: To recognize and classify reactions as exothermic or endothermic Liliana Ospina By: Fabio Espinosa 23/02/2009 ENERGY Aim: "To recognize and classify reactions as exothermic or endothermic" Method: For each of the following experiments you should: * Record data * Record initial and final temperatures as their maximum/lower points * If you use the measuring cylinders, don't forget to rinse them * Stir the contents * Carry out all the reactions in the small beakers provided * Classify if the reaction was endothermic or exothermic * NEVER take away the stock solids and solutions to your table * Analyze results Experiments: 1. Add one spatula of Zinc to 10cm3 of Copper Sulfate solution. ...read more.

Middle

Now add 2 spatulas of Sodium Chloride. 9. Add half spatula of Manganese Dioxide powder to 10cm3 of Hydrogen Peroxide solution. 10. Add one spatula of Zinc to 10cm3 of Hydrochloric Acid. RESULTS: Experiment # Initial Temperature (oC) Final Temperature (oC) Reactants Temperature Change (oC) Reaction 1 20 41 Zinc + Copper Sulfate 21 Exothermic 2 19 21 Copper Sulfate + Sodium Hydroxide 2 Exothermic 3 18 27 Sodium Hydroxide +Hydrochloric Acid 9 Exothermic 4 19 36 Magnesium + Hydrochloric Acid 17 Exothermic 5 17 14 Ammonium Nitrate + Water -3 Endothermic 6 18 23 Sodium Hydroxide + Water 5 Exothermic 7 18 21 Calcium Carbonate + Hydrochloric Acid 3 Exothermic 8 1 -10 Crushed Ice + Sodium Chloride -9 Endothermic 9 17 57 Manganese Dioxide + Hydrogen Peroxide 40 Exothermic 10 18 26 Zinc + Hydrochloric Acid 8 Exothermic Calculations (temp): * Magnesium + Hydrochloric Acid (Mg + HCL) ...read more.

Conclusion

Acid --> Magnesium Chloride + Hydrogen Mg + 2 HCl --> MgCl2 + H2 Zinc + Hydrochloric Acid --> Zinc Chloride + Hydrogen Zn + 2HCl --> ZnCl2 + H2 Conclusion: All reactions that included an acid were Exothermic Evaluation: I think we did a great lab, we used time wisely, used accurate quantities, took it seriously, we did not bother in class. Although it could have been improved, well when we took the temperatures we just took the reading while we could of have waited until it reached its maximum or minimum temperature, making the experiment with much more accurate results. Factors Affecting getting maximum temperatures: In my opinion there are several variables which affect accurate temperature readings; * Room temperature * Quality of thermometer * Temperature o ?? ?? ?? ?? ...read more.

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