What is Matter: Phase Changes lab with Gizmos

Go to this website: https://apps.explorelearning.com/account/gizmos/login/student

Then enter "soonlee" for teacher's username.Select this course: "ISCI 2002 Physical Sciences hybrid" and select name (Min Y). The password is "isci2002" for this class then you should be able to get into the class and see "Phase Changes" simulation.

Part B: Phase Changes lab with Gizmos 2) Investigate: Use the Gizmo to explore phase changes. Use the Add/remove 1. Prior Knowledge Questions (Do these BEFORE using the Gizmo.) heat energy slider to control the water temperature. Record your observations in your notes, then answer the questions below: 1] A family from Minnesota tums off the heat and flies to Florida for a winter holiday. When they come home, all their water pipes have burst. What do a. At what temperature does water freeze? This is the freezing point. you think happened? b. At what temperature does ice melt? This is the melting point. C. At what temperature does water boil? This is the boiling point. 2) Spaghetti takes about 9 minutes to cook at sea level, but about 14 minutes in the mountains. Why do you think this is so? 3) Observe: Set up the Gizmo to observe freezing, melting, and boiling. What * Then, launch the Phase Changes lab on the class page. Follow the following do you notice about the temperature while the water is in the process of instructions to complete this assignment. changing phases? 3) Gizmo Warm-up In the Phase Changes Gizmo, select Micro view and set the Ice volume to 50 cm'. Notice the nitrogen (% I. oxygen (8), and water (@] molecules. 4) Observe: Click Reset. The mean molecular speed of the water molecules is displayed below the container. Set the Water temperature to 0 "C and Click Play () and observe water molecules in the Add/remove heat energy to 400 J/s. Click Play. solid (ice), liquid (water), and gas (air) phases. a. How does the mean speed of the water molecules change as they are Describe the difference in the movement of the heated? molecules in the solid, liquid, and gas phases. b. Does the mean molecular speed change as much as the temperature as the water heats up? Explain. C. How is temperature related to the motions of molecules? 2. Activity A: Phase Changes . Click Reset ( 2)) and select Micro view. . Set the Water temperature to 10 "C. Set the Ice volume to 0 cm:. 5) Interpret: Select the GRAPH tab to see a graph of temperature vs. time. Click the "-" button until the whole graph is visible. What does the graph look like during a phase change? Why do you think the graph looks this way? Investigation Question: How is temperature related to phase changes? Why do these phase changes occur? 1] Predict: Based on your prior knowledge, answer the question "how is temperature related to phase changes?" and explain why you think this.6] Observe: Click Reset. Set the Water temperature to 20 C and the Ice 3. Activity B: Altitude and phase changes volume to 50 cm3. Set Add/remove heat energy to 0 J/s. Click Play. How do Investigation Question: The altitude of a location is its vertical distance above the molecules in the liquid interact with the molecules in the solid? sea level. How does altitude affect the freezing point, melting point, and boiling point? 7) Observe: Click Reset. Set the Water temperature to 100 C and the Ice . Click Reset ( )). volume to 50 cm3. Click Play. How does this situation compare to the previous . Set the Altitude to 5,000 meters [16,404 feet). . Set the Ice volume to 0 cm:. one? 1] Predict: As altitude increases, the air pressure decreases. How do you think the increasing altitude affects the freezing point, melting point, and boiling point? 8] Propose a theory: Based on what you have observed, explain why you think phase changes occur. 2] Plan: How will you use the gizmo to find the answer to this question? Write out a short procedure. 9) Apply: Use your theory to explain what happens at the molecular level in each of the following situations. Also, list the temperature at which each transition occurs. 3] Investigate: Follow your investigation plan. Write down the data you collect a. Ice is warmed to the melting point: here using a table. b. Water is warmed to the boiling point: c. Water is cooled to the freezing point: 4) Claim: Write your answer to the investigation question: "How does altitude affect the freezing point, melting point, and boiling point?" 10] Extend your thinking: Click Reset. Set the Water temperature to 0 =C, the Ice volume to 0 cma, and Add/remove heat energy to -400 J/s. Click Play and wait until 5) Evidence: Describe how the data you collected from the simulation all of the water freezes. provides support for your claim. a. What volume of ice is created from 200 cm of water? What is happening at the molecule level at this time? 6] Reasoning: Explain these results hosed on the fact that air pressure decreases with altitude. Increasing air pressure means more air molecules or faster moving molecules. b. Why do water pipes sometimes burst in the winter? 7) Apply: Why does pasta take longer to cook in the mountains? 8] Apply: A pressure cooker allows food to be cooked under high pressure. Why is this useful?9) Complete the table below: Going From|Going to Name How the heat energy changes Examples Solid Liquid Liquid Gas Gas Liquid Liquid Solid Gas Solid Solid Gas