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chem design lab 2

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Introduction

Mojeeb Nazeri Dr. Hall 12/01/08 2599457 Design Lab Investigate the amount of energy given off from liquid fuel cells Calorimeter is a device used to measure the heat of chemical reactions, physical changes and used to determine the amount of heat released or absorb during a chemical reaction. Fuel which is used every day as a source of energy cans combust giving of different amounts of energy. In this experiment the combustion of liquid candle will be used to find the change in temperature of 20 ml beaker of water at different times. Using this experiment, we can used the energy given of by the candle fuel to determine how other fuels used in everyday life gives off energy and how to improve these conditions. Problem: how would change in time affect the temperature of water while heated by a liquid fuel? Hypothesis: if the beaker of water burns for a long time, then the temperature would be greater from the original temperature than the beaker that burns for less amount of time. Procedures: Materials: * Goggles * Apron * Beakers * Water * Flame (candle) * Stopwatch * Pencil * Paper * Ring stands * Lighter * Thermometer * Graduated Cylinder * Wire Gauze Procedure 1. Collected all necessary materials 2. Put on your apron and goggles 3. Set up the beaker in the ring stand on top of the wire gauze 4. ...read more.

Middle

2 min Trial Trial 1 Amount of water Initial Temp Final Temp Change in Temp Trial 2 Amount of water Initial Temp Final Temp Change in Temp Trial 3 Amount of water Initial Temp Final Temp Change in Temp 3 min Trial Trial 1 Amount of water Initial Temp Final Temp Change in Temp Trial 2 Amount of water Initial Temp Final Temp Change in Temp Trial 3 Amount of water Initial Temp Final Temp Change in Temp 4 min Trial Trial 1 Amount of water Initial Temp Final Temp Change in Temp Trial 2 Amount of water Initial Temp Final Temp Change in Temp Trial 3 Amount of water Initial Temp Final Temp Change in Temp Q = mc?T Q Mass Change in Temp C 4.18 J/G �C Processed Data Uncertainty Equipment Uncertainty Beaker � 0.01 ml Thermometer � 0.01 �C Stopwatch � 0.01 seconds Graduated Cylinder � 0.01 ml Control-1 minute Trial 1 Amount of water Initial Temp Final Temp Change in Temp 20 � 0.01 ml 22.50 � 0.01 �C 30.00 � 0.01 �C 8 � 0.02 �C Trial 2 Amount of water Initial Temp Final Temp Change in Temp 20 � 0.01 ml 22.45 � 0.01 �C 31.30 � 0.01 �C 9 � 0.02 �C Trial 3 Amount of water Initial Temp Final Temp Change in Temp 20 � 0.01 ml 22.40 � 0.01 �C 30.65 � 0.01 �C 8 � 0.02 �C 2 min Trial Trial 1 Amount of water ...read more.

Conclusion

Temperature (40.40) 0.01 �C /40.40 �C � 100 % 0.02% T2. Temperature (41.70) 0.01 �C /41.70 �C � 100 % 0.02% T3. Temperature (40.55) 0.01 �C /40.55 �C � 100 % 0.02% 3 Minute Trial T1. Temperature (50.75) 0.01 �C /50.75 �C � 100 % 0.02% T2. Temperature (50.35) 0.01 �C /50.35 �C � 100 % 0.02% T3. Temperature (50.20) 0.01 �C /50.20 �C � 100 % 0.02% 4 Minute Trial T1. Temperature (56.15) 0.01 �C /56.15 �C � 100 % 0.04% T2. Temperature (55.90) 0.01 �C /56.15 �C � 100 % 0.04% T3. Temperature (56.20) 0.01 �C /56.15 �C � 100 % 0.04% Q = mc?T of control Q = 4.18 J/G �C � (0.048g) � change in Temperature Q= 20.00 ml (1L/1000ml)(1mol/22.4)(18.08/1 mol) = 0.0161 g Conclusion In this experiment it was proven that when certain about of water are left for a certain time over a flame it would change in temperature. The longer the water is over the flame, the temperature increased which proved the hypothesis to be correct. This experiment proved that the more time water is heated, the higher the temperature would be. If this experiment was to be conducted the next time, there would be a lot of changes. First the control would be in the temperature of water without any heated added to it. Then the time it was to be heated would be longer than one minute different in each different trial. More trials of the same time would be conducted to make sure that the experiment would be performed correctly. ...read more.

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