Changes of state
Adding thermal energy to a substance makes its particles move faster and spread farther apart, and removing thermal energy makes them move slower and pack closer together. Enough of a change in particle motion causes the substance to change state entirely, like ice's particles gaining enough energy to break free of their fixed positions and become liquid water.
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Test your knowledge
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Midterm
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
Final, Part 1 of 2
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Final, Part 2 of 2
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