MeltingPointsSE (1).pdf - Name Alicia Lobaina Date Student...

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Name: Alicia Lobaina Date: 10/26/19 Student Exploration: Melting PointsVocabulary:boiling point, covalent bond, intermolecular forces, ionic bond, melting point, metallic bond, molecular solid, network solid, salt, smoke, sublimation, sublimation point, transition point Prior Knowledge Questions (Do these BEFORE using the Gizmo.)1. Suppose you had two socks sticking together in the clothes dryer from static electricity. What happens if they are spun gently?
2. What could happen if they are tumbled rapidly?
Gizmo Warm-up Like socks in the dryer, solids are held together by molecular-scale forces. When solids are heated, molecules move faster and spread apart as the solid becomes liquid and gas. In the Melting PointsGizmo, you will measure the transition pointsat which melting and boiling occur for a variety of substances. The Gizmo shows a lab device used to determine melting pointsand boiling points. A small amount of substance is placed in a glass tube and heated inside the device. 1. To begin, check that Sodium chlorideis selected. Drag the dial to the right to apply heat. A. When the temperature is around 600 °C, drag the dial back to 0. Notice that the sodium chloride is red-hot, but it is still a solid. B. Drag the dial to the right. When the sodium chloride melts, move the dial back to 0. About what temperature does sodium chloride melt?
2. Click Reset. This time, decrease the setting on the dial as you get close to the melting point. Notice that melting occurs over a range of temperatures. Can you determine the exact range of temperatures over which melting occurs? (This may take several tries, be patient.) What is the temperature range over which melting occurs?
2019

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