Pilger CHEM 120 Lab 8 Heat Capacity Experiment(1)

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Old Dominion University *

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120

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Chemistry

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Dec 6, 2023

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P RE -L AB Q UESTIONS 1. What is the equation that is used to determine the heat required to change a specific mass of a substance by a specific temperature change. a. q = mcΔT 2. If we assume in the experiment that the cups do not absorb or release any heat, what is the relationship between the heat lost by the metal and the heat gained by the water. Use complete sentences to explain the relationship. a. Heat lost by metal is equal to heat gain by the water. Because the cup is insulated, there is no heat exchange in the atmosphere and the cup does not absorb or relese any heat. 1. ©2018, eScience Labs Heat Capacity
E XPERIMENT : H EAT C APACITY Experiment Inventory Materials 2 Styrofoam™ 8 oz. Cups Styrofoam™ 8 oz. Cup Lid Unknown Metal *Camera/Smart Phone *Stove-Top or Microwave *Tap Water *Wooden Toothpick (if using a microwave Note: You must provide the materials listed in *red. Labware 100 mL Graduated Cylinder 500 mL Glass Beaker Test Tube Clamp Thermometer Scale *Hot Pad *Cooking Pot *Stopwatch / Clock *Paper Towels ©2018, eScience Labs Heat Capacity
In this experiment, you will determine the specific heat capacity and molar heat capacity of a metal and use these values to identify the metal. Safety – All normal safety precautions should be followed including wearing safety glasses. PROCEDURE 1. Put on your safety glasses and gloves (Provided in your safety box) 2. In a cooking pot add 500 mL of tap water, place on the stovetop and bring the water to a boil. Set a stopwatch for 3 minutes. Once it has boiled for three minutes, reduce the heat from a boil to a simmer. 3. Turn on the scale by pressing the button labeled 0/T. Once the scale is on, press the 0/T button a second time to zero the scale. Make sure that the units are in grams (g). If not, press the M button until the units displayed are in grams. 4. Place a Styrofoam cup on the scale and tare it (zero it) by pressing the 0/T button. 5. Using your 100mL graduated cylinder measure approximately 50 mL of room temperature tap water and pour it into the Styrofoam cup. Place the cup on the scale and record the mass of the water. 6. Put the two Styrofoam™ cups together by placing the Styrofoam™ cup containing 50 mL of room temperature tap water inside the empty Styrofoam™ cup. 7. Tare the empty scale and place the unknown metal on the scale. Record the weight of the unknown metal. 8. Place your cups upright inside of the 500 mL beaker. The beaker is used to provide vertical support for the Styrofoam™ cups. (See figure 1) 9. Make sure that your metal will not protrude above the water level in the cup; if necessary you may need to carefully bend or cut it. Insert the thermometer into the hole in the lid. This apparatus is your calorimeter. 10. Record the initial temperature of the water in the cups. 11. Put your insulated glove or hot pad on over your safety glove, then pick up the unknown metal strip with the test tube clamp and hold the clamp and unknown metal in the simmering water for five minutes to ensure that the clamp and metal reach the same temperature as the water. Safety Note: Boiling water and steam will cause severe burns. Be very careful not burn yourself. Hint : Do not drop the unknown metal into the pot of hot water and leave it there. It will be difficult to retrieve the heated metal from the hot water and any attempt to do so could ©2018, eScience Labs Figure 1 : Sample set-up for step 6
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