NameDateClassLab 23: Phase ChangesPurposeTo study the phase changes as water is heated from solid to liquid to watervaporBackgroundDepending on the temperature, most substances can exist as either a solid or aliquid. A substance in its liquid state has more thermal energy than it has in itssolid state. The temperature at which the transition from a solid to a liquidtakes place is called the melting point of the substance.The molecules that make up a gas have more thermal energy than do moleculesof the same substance in the liquid state. The liquids molecules are in closecontact with each other while gas particles are spaced signicantly furtherapart. The transition from a liquid to a gas is known as vaporization and occursby either evaporation or boiling. The normal boiling point is the temperature atwhich the substance boils at sea level. Melting and vaporization points arecharacteristic properties of a substance. Chemists often use these points to helpidentify or classify a substance.Skills FocusGraphing, interpreting data, applying concepts, drawing conclusions, relatingcause and effect, making judgmentsProcedure1. Start Virtual Physics and sel ...
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