There is a glass container with a measuring scale on it

Table A: Validating the Assumption about Insulation 1. Measure about 40 ml. of distilled water with a graduated cylinder and add to a 150 mL beaker and heat to between 60 and 70°C. Work on steps 2 and 3 while the water is heating. 2. Weigh and record the mass of two nested Styrofoam cups and cover in Data Table A. Table A: Validating the Assumption about Insulation 3. Add about 60 mL of distilled water using a graduated cylinder and reweigh the cups, lid and water and record this mass in Data Table A. Calculate and record the mass of the "cold water". 4. Set up your calorimeter as follows: place the nested cups in a 400 mL beaker to prevent spilling the contents. Place the lid tightly on the cup. 5. When the warm water is between 60 and 70°C, you are ready to measure temperatures. Insert the thermometer in the calorimeter. 6. Measure the temperature of the water in the calorimeter (cold water) by inserting the thermometer through the hole in the cup lid. When the lid is on the cup, the thermometer should not touch the cup's sides or bottom. Keep the lid tightly on the cup during measurements so all the heat exchange occurs within the cup. Record this temperature in Data Table A. 7. Uncover the calorimeter and quickly pour the warm water into it. Be careful not to let the water spatter from the cup, or you will lose accuracy. Replace the calorimeter cover. Swirl the water carefully so as not to splash or spill the water. Record the temperature of the mixture in Data Table A as soon as it becomes steady, about 30 seconds after mixing. 8. Reweigh the assembly and record the mass in Data Table A. Calculate and record the mass of the warm water you added.

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