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Understanding Phase Changes

Explore how altitude affects water’s freezing, melting, and boiling points. Learn why cooking changes at high elevations and how pressure cookers help speed up cooking under high pressure.

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Name: Julieta Aguilar Date: 3/21/23Student Exploration: Phase ChangesVocabulary:altitude, boil, boiling point, freeze, freezing point, gas, liquid, melt, melting point,phase, solidPrior Knowledge Questions (Do these BEFORE using the Gizmo.)1.A family from Minnesota turns off the heatandflies to Florida for a winter holiday. Whentheycome home, all of their water pipes have burst. What do you think happened?The water pipes froze, meaning the water expanded and the pipes burst.2.Spaghetti takes about 9 minutes to cook at sea level, but about 14 minutes in themountains. Why do you think this is so?As attitude increasesand atmosphere pressure decrease, the boiling point of waterdecreases.Gizmo Warm-upInthePhase ChangesGizmo, selectMicroviewandset theIcevolumeto 50 cm3. Notice the nitrogen {%), oxygen {$),and water {<') molecules.Click Flay {►) and observe water molecules in the solid(ice),liquid(water), and gas {air) phases.1.In which phase(s) are the molecules held rigidlytogether? Solid - Ice2.In which phasefs) do the molecules move freely?Gas3.In which phase(s) are the molecules held in a defined shape? Solid - Ice4,In which phase(s) do the molecules take the shape of their container? Liquid and Gas■' 2019 I >i- 1i-.ilUHIM'■:•II-.rr -,rl vr‘11

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Subject
Chemistry

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