In chemistry, substances require a certain amount of energy in the form of average kinetic energy (temperature) to freeze. To reach the temperature a substance requires to freeze, it must lose a certain amount of heat energy (a form of energy transferred from one object to another, because of a temperature difference). When a substance reaches its freezing point and begins to freeze, its temperature remains constant until it is completely frozen. However, in order to melt a substance must go through a energy change, creating the problem, “What energy changes occur when a liquid solidifies?”. To solve the problem, a hypothesis was proposed, stating “When a substance begins to solidify, it releases heat energy, because a substance must reach its heat of solidification (heat required to freeze) by losing a certain amount of heat, in order to solidify”. In order to test this hypothesis, a experiment was performed. Materials and Methods
In the experiment, the materials required were 1 wax sample in a test tube with the weight of the test tube labeled, a 250 mL beaker, a ringstand, a wire gauze, a graduated cylinder, a Bunsen Burner, a styrofoam calorimeter, and a thermometer. To perform the experiment, first the calorimeter was filled with 100 mL of water using a graduated cylinder, and the temperature of the water was found and recorded. Next, the beaker was filled 3/4 full with water and placed on the stand of the ringstand above a gently burning flame from the Bunsen Burner. Then, the mass of the test tube and wax was found and recorded, and the tube was placed in the beaker. After the wax in the tube melted, the tube was placed in the calorimeter, using a wire gauze. Lastly, once the wax in the tube solidified, the temperature of the water in the calorimeter was measured and recorded. Results
Data Recorded During Experiment
Mass wax and test tube41.2 grams...