Physics Lab 7

Physics Lab 7 - Specific Heat and Latent Heat of Fusion...

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Specific Heat and Latent Heat of Fusion Laboratory #7 Michael Dark Section 106 Ashley Pearson Wendy Huang

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Purpose The purpose of this lab was to determine the specific heat of brass and another metal, and to measure the latent heat of fusion of ice, using a calorimeter. We also observed the temperature versus time behavior of a material that undergoes a phase transition. Theory The total amount of heat that flows into an object is equal to Q = c m T Where c is the specific heat of the object, m is the mass of the object, and T is the change in temperature. If no heat is lost to the environment, then it is equivalent to Q metal + Q water + Q calorimeter = 0 Where Q metal is the heat of the metal, Q water is the heat of the water, and Q calorimeter is the heat of the calorimeter. C calorimeter *m calorimeter = 63 J/ ° C C water = 4186 J/kg- ° C The amount of heat needed to melt an arbitrary mass of an object is equal to Q melt = m object * L f Where m is the mass of the object and L f is the latent heat of fusion. Procedure We began the experiment by weighing the dry empty calorimeter without the thermometer and obtaining a mass of .2758 kg. We then measured the mass of the brass block and obtained a mass of .2519 kg. We attempted to heat the brass block in boiling water to 100 ° C but obtained only 99.2 ° C. We left the block in the boiling water for five minutes and filled the calorimeter with 100 cm 3 of water at 20 ° C. We then measured the mass of the filled calorimeter at .4269 kg and used this value along with the mass of the
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Physics Lab 7 - Specific Heat and Latent Heat of Fusion...

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