객관식
Which of the following terms describes the process by which a gas changes directly into a solid?
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1. Intro to General Chemistry
Physical & Chemical Changes
Multiple Choice
When water changes from a solid to a liquid or from a liquid to a gas, what happens to its chemical structure?
A
Water molecules rearrange to form H2O2 during state changes.
B
The chemical structure of H2O remains unchanged.
C
The chemical bonds within each H2O molecule are broken.
D
The chemical structure of H2O breaks down into hydrogen and oxygen gases.
검증된 단계별 안내1
Understand that a change in state (solid to liquid or liquid to gas) is a physical change, not a chemical change.
Recall that in a physical change, the molecules themselves remain intact; only the arrangement and energy of the molecules change.
Recognize that water (H2O) molecules do not break apart or rearrange into different molecules during melting or boiling.
Note that the chemical bonds within each H2O molecule (the covalent bonds between hydrogen and oxygen atoms) remain unchanged during phase changes.
Conclude that the chemical structure of H2O remains the same, and only the physical state and molecular interactions change.
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