Background: A heating curve is a graph of temperature vs. energy added. Since the energy added is difficult to measure directly, we will be recording the temperature change as a function of time. 

Purpose: The purpose of this lab is to collect data to develop a heating curve for water.

Hypothesis:When a constant supply of heat is given to a solid sample, the substance will absorb heat until the KE of the particles are high enough to go to the next phase, because energy makes molecules move and bonds become broken.

Materials:

Ice

250 mL beaker

Thermometer

stirring rod

hot plate

safety glasses

stir bar

Safety:

Summary of Procedure:

1. Plug in the hot plate and turn the setting to approx 350. Allow hot plate to heat up for at least 5 minutes.

2. Fill half 1000-mL (1L) beaker with ice and water. Place a thermometer in the beaker with the mixture. When the temperature of the mixture has been measured, place the beaker on the hot plate (leave the thermometer in beaker).

3. Using a stir bar make sure the mixture is stirred constantly. Make sure that the thermometer is immersed in the ice/water and does not touch the sides or bottom of the beaker. (You want to record the temperature of the ice, not the beaker.)

4. Continue stirring until the water is fully boiling. When you are done collecting data remove the thermometer and turn off the hot plate. Clean and put away all materials.

5. Create a graph with properly labeled axes.