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PhaseChangesSEKey

Explore the behavior of water molecules in solid, liquid, and gas phases. Observe how molecular motion and arrangement change with state. Great for visualizing states of matter!

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Phase ChangesAnswer KeyVocabulary:altitude, boil, boiling point, freeze, freezing point, gas, liquid, melt, melting point,phase, solidPrior Knowledge Questions (Dothese BEFORE using theGizmo.)/Atote:The purpose of these questions is to activate prior knowledge and get students thinking.Students are not expected to know the answers to the Prior Knowledge Questions.]Marla wants a hard-boiled egg for breakfast. The recipe says boil water, then lower the heat sothe water is simmering. But Marla is in a rush, so she keeps the heat on high as the egg cooks.Do you think the egg will be done faster if the heat is kept on high as the water boils?Answers vw// vary[Correct answer is no.]Explain your answer. Bcp/anations vw// vary.[The boiling temperature of water is constant, s othe egg will take the same amount of time to cook no matter what the burner is set to.]GizmoWarm-upInthePhase ChangesGizmo, selectMicro view.Noticethe nitrogen (*?»), oxygen ($), and water ( P ) molecules.Tostart, create ice. Set Add/removeheat energyto -200J/s, click Play (* ), and then clickPause () when thecontainerisabout half ice,halfwater. SetAdd/removeheat energyback to0J/s, and then clickPlay.1.Observe water molecules in thesolid(ice),liquid(water), and gas (air) phases.A. In which phase(s) do molecules move freely? Gas anOquidB. Inwhichphase(s) are molecules held together?SolidC. What do you notice about the positions of the ice molecules? They form hexagons.When frozen, water molecules form a hexagon (six-sided shape) pattern.2.Click Reset {■s ):and select Macro view. Set the Ice volume to 25 c m3.A. In which phase(s) is water held in a defined shape? SofidB. Inwhich phase(s) does the water take the shape of the container? L/qutd and gas

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Subject
Chemistry

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