boiling water lab

Goal: To compare the rate of heating for different types of substances.

Place 250 mL of water in a microwave-safe glass container. Place the container in the microwave, noting the exact position of the container. Record the initial temperature of the water before microwaving. Microwave on high for 15 seconds, quickly stir the water, and record the temperature. Microwave an additional 15 seconds, stir, and record the temperature. Repeat only up until the liquid boils OR for a total of 5 minutes OR until the thermometer reaches its maximum temperature, whichever comes first. Remove the container from the microwave and continue to record the temperature every 15 seconds for at least another 5 minutes as the water cools. Repeat this procedure with 250 mL of vegetable oil. Be sure to use the same (or identical) container and place the container in the same place in the microwave.

 

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