16.1 Thermal Energy and Matter
16.2 heat and Thermodynamics
16.3 Using heat
What happens When hot and cold Liquids Mix?
Procedure
Fill one graduated cylinder with hot water and another with cold water. CAUTiON Be careful when handling hot liquids. Use a thermometer to measure the temperature of the water in each graduated cylinder. Record the temperatures.
Pour 100 mL of hot water into a plastic foam cup. Add 100 mL of cold water to the cup. Stir the water with a glass rod, and measure and record its temperature.
Repeat Step 2, this time adding 50 mL of cold water to 100 mL of hot water.
Think About it
Comparing and Contrasting How did the final temperatures in Steps 2 and 3 compare?
Relating cause and Effect What factors can you identify that determine the final temperature when you mix hot water with cold water?
Controlling Variables Why do you think it was important to use the same graduated cylinders in Step 3 that you used in Step 2?