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Experiment 2 Pre-Lab Exercise

Experiment 2 Pre-Lab Exercise - 0.077 Lead Pb 0.038 Silicon...

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Chem 120, Autumn Quarter 2011 Page 1 of 2 Name : Quiz Section No. : EXPERIMENT 2 CALORIMETRY PRE-LAB EXERCISE 1. Define specific heat . 2. Below is a list of metals along with their specific heat values in units of cal / (g · °C). Assume that 11 g of each metal has been provided. Answer the following questions about these metals by writing the correct element symbol in the spaces provided. a. The metal that will absorb the largest amount of heat given the same temperature change: b. The metal that will reach the highest temperature upon absorbing a given amount of heat: Metal Symbol Specific Heat (cal/g. o C) Metal Symbol Specific Heat (cal/g. o C) Potassium K 0.18 Copper Cu 0.092 Sodium Na 0.29 Mercury Hg 0.033 Cadmium Cd 0.055 Silver Ag 0.057 Magnesium Mg 0.24 Platinum Pt 0.032 Aluminum Al 0.22 Cobalt Co 0.10 Zinc Zn 0.093 Molybdenum Mo 0.060 Iron Fe 0.11 Selenium Se 0.077
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Unformatted text preview: 0.077 Lead Pb 0.038 Silicon Si 0.052 Tin Sn 0.052 Gold Au 0.031 Make sure to report ALL numbers with correct units and the proper number of significant figures indicated. Chem 120, Autumn Quarter 2011 Page 2 of 2 Name : Quiz Section No. : 3. If 19 g of water is heated so that the water temperature rises from 18.5°C to 23.3°C, how many calories have been absorbed by the water? The specific heat of water = 1.00 cal / (g · °C). 4. The following data was collected for an endothermic dissolution in 87.2 mL of ethyl alcohol. Time (s) Temp ( o C) Time (s) Temp ( o C) 0 25 5 23 45 12 10 22 50 10 15 21 55 9 20 20 60 8 25 18 65 7 30 16 70 6 35 15 75 6 40 14 80 6 Calculate the amount of heat in kilojoules (kJ) lost by the solvent. The specific heat for ethyl alcohol = 0.59 cal / (g · °C), and the density of ethyl alcohol is 789.3 kg / m 3 . (1 cal = 4.184 J)...
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