A student observes the properties of a substance changing between phases. The student draws the molecules of the substance in different phases, as shown.How do the changes in phase affect the substance?ResponsesChanges in phase change the size of the molecule.Changes in phase change the size of the molecule.Changes in phase change the shape of the molecule.Changes in phase change the shape of the molecule.Changes in phase change the number of molecules.Changes in phase change the number of molecules.Changes in phase change the distance between molecules.Changes in phase change the distance between molecules.
Question
A student observes the properties of a substance changing between phases. The student draws the molecules of the substance in different phases, as shown.How do the changes in phase affect the substance?ResponsesChanges in phase change the size of the molecule.Changes in phase change the size of the molecule.Changes in phase change the shape of the molecule.Changes in phase change the shape of the molecule.Changes in phase change the number of molecules.Changes in phase change the number of molecules.Changes in phase change the distance between molecules.Changes in phase change the distance between molecules.
Solution
Changes in phase do not change the size or shape of the molecules, nor do they change the number of molecules. What changes during a phase transition is the distance between the molecules. For example, in a solid phase, molecules are tightly packed together, while in a liquid phase, they have more space to move around, and in a gas phase, they are spread out even further. This change in distance between molecules is what leads to the different properties we observe in different phases.
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