What is the relationship between kinetic energy and temperature?Describe how particles move in a solid.__________________________________Describe how particles move in a liquid: _________________________________Describe how particles move in a gas: __________________________________What is the freezing point of water on the Celsius scale?_____ boiling point? ______In terms of energy how do you make something melt? How do you make something freeze?DataTime(minutes)Temperature(°C)Time(minutes)Temperature(°C)Time(minutes)Temperature(°C)Time(minutes)Temperature(°C)0.55.510.515.51.0611161.56.511.516.52712172.57.512.517.53813183.58.513.518.54914194.59.514.519.55101520ConclusionsStaple your graph to this sheet.1)What happens to the temperature as the ice is melting? ________________________________________________________________________2)What happens to the temperature once the water starts boiling?__________________________________________________ _____________________3)Describe in terms of kinetic energy what is happening to the molecules as the temperature of the water increases.________________________________________________________________________________________________________________________________________________
4)Compare the kinetic energies of a water molecule in a solid, in a liquid and in a gas.________________________________________________________________________________________________________________________________________________5)Describe the path of energy and energy transformations from theelectric outlet to the ice.________________________________________________________________________________________________________________________________________________6)If the energy from the hotplate is not causing the temperature to increase during the phase change, where is this energy going?________________________________________________________________________
Changing of State Lab: FreezingObjective: To determine what happens to the temperature of water as it freezesMaterialsTest Tube400 mL BeakerThermometerRing StandIceGraduated CylinderClampSaltWaterSpoonProcedure1)Fill a 400 mL beaker 1/3 full with ice, then add 100 mL of water.2)Put 5 mL of water into a test tube and use a clamp to fasten the test tube to a ring stand. The tube should be clamped above thewater bath. Place the thermometer into the water inside the tube.3)Lower the test tube into the ice water bath.4)Soon after lowering the test tube, add 5 spoonfuls of salt to the beaker and stir with a spoon. Continue to stir the water bath during the experiment.5)Slightly move the thermometer during the first ten minutes of the experiment. Keep the thermometer in the ice as it forms, notabove the ice. When 10 minutes have passed stop moving the probe and allow it to freeze into the ice. Add more ice cubes to the water bath as the original ice cubes get smaller.6)When 15 minutes have passed, stop collecting data.AnalysisMake a graph of temperature vs. time1)What happens to the temperature of the water as it begins to freeze?2)Where is the energy in the water going as it freezes?3) Why is the ice in the water bath melting, while the ice in the testtube freezes?
Episode: Salsa EscapeMyth: Convicts in Mexico escaped their prison cell by using salsa to corrode the bars away.Topics of Discussion-Reactivity of metals with acid-Strength of acids (pH)Classroom Integration Suggestions-Salsa Heat Lab-Salsa Ingredient Lab-Acid pH Lab
“Salsa Escape”Lab One: Objective: To determine if the “hotness” of salsa affects the rate at which it corrodes metal.