Textbook Question
Use the phase diagram of neon to answer the following questions. (a) What is the approximate value of the normal boiling point?
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13. Liquids, Solids & Intermolecular Forces
Phase Diagrams
Multiple Choice
What happens to the arrangement of water molecules as water melts and freezes?
A
As water melts, molecules form a crystalline structure; as it freezes, they become disordered.
B
As water melts, molecules remain in a fixed position; as it freezes, they start moving freely.
C
As water melts, molecules become more ordered; as it freezes, they become less ordered.
D
As water melts, molecules become less ordered; as it freezes, they become more ordered.
Verified step by step guidance1
Understand the structure of water molecules in different states: In the solid state (ice), water molecules are arranged in a highly ordered crystalline structure due to hydrogen bonding.
Consider the melting process: As ice melts, the energy input breaks some of the hydrogen bonds, causing the molecules to move more freely and become less ordered, transitioning to a liquid state.
Analyze the freezing process: When water freezes, the temperature decreases, and the kinetic energy of the molecules reduces, allowing hydrogen bonds to reform and the molecules to arrange themselves into a more ordered crystalline structure.
Compare the order of molecules: In the liquid state, water molecules are less ordered compared to the solid state, where they are in a fixed, orderly pattern.
Conclude the changes in molecular arrangement: As water melts, the molecular arrangement becomes less ordered due to increased movement. Conversely, as water freezes, the arrangement becomes more ordered as the molecules settle into a crystalline structure.
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