Chem 120, Summer Quarter 2012
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Quiz Section No.:
EXPERIMENT 2 – CALORIMETRY PRE‐LAB EXERCISE Make sure to report ALL numbers with correct units and the proper number of significant figures indicated. 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 Potassium Sodium Cadmium Magnesium Aluminum Zinc Iron Lead Tin K Na Cd Mg Al Zn Fe Pb Sn Specific Heat (cal/g.oC) 0.18 0.29 0.055 0.24 0.22 0.093 0.11 0.038 0.052 Metal Symbol Copper Mercury Silver Platinum Cobalt Molybdenum Selenium Silicon Gold Cu Hg Ag Pt Co Mo Se Si Au Specific Heat (cal/g.oC) 0.092 0.033 0.057 0.032 0.10 0.060 0.077 0.052 0.031 Chem 120, Summer Quarter 2012
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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 (oC) Time (s) Temp (oC) 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 / m3. (1 cal = 4.184 J)