Brandon Upton L09_Enthalpy_Specific_Heat.docx - Lab 9 Enthalpy and Specific Heat In today\u2019s lab I will be learning how to determine and compare the

# Brandon Upton L09_Enthalpy_Specific_Heat.docx - Lab 9...

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Lab 9: Enthalpy and Specific Heat In today’s lab, I will be learning how to determine and compare the specific heat of an unknown metal while recording my data throughout the lab. Upon completion of the experiment, I will be able to determine the unknown metal. During this experiment I will also be testing the endothermic and exothermic processes between an ice pack and heat warmers. Pre – Lab Questions : 1. When 3.0 kg of water is warmed from 10 °C to 80 °C, how much heat energy is needed? q=cmΔT q = (4.186 J/ g o C)*(3.0 kg)*(70°C) 879,060 J 2. A calorimeter contains 100 g of water at 39.8 ºC. A 8.23 g object at 50 ºC is placed inside the calorimeter. When equilibrium has been reached, the new temperature of the water and metal object is 40 ºC. What type of metal is the object made from? 4.86JgK * 100g * (40 o C – 39.8 o c) 83.72 J 8.23g*(50c – 40c) 823cJ 83.72J /823L 0.10173JgK Lead Experiment 1 : Determination of Specific Heat of a Metal Table 2: Mass Mass (g) Water 50.0g Unknown Metal Strip Table 3: Specific Heat Data
Time (minutes) Temperature (°C) Trial 1 Trial 2 Trial 3 Initial 21.7°C 21.6°C 21.6°C 5 Minutes 23.5°C 23.3°C 23.9°C 6 Minutes 23.7°C 23.6°C 24.6°C 7 Minutes 23.8°C 23.8°C 24.8°C 8 Minutes 23.8°C 23.8°C 24.8°C 9 Minutes 23.8°C 23.8°C 24.9°C 10 Minutes 23.8°C 23.8°C 24.9°C Average Specific Heat Capacity of the Unknown Metal: 0.250