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Fundamentals of chemistry

The changes in speed and motion of molecules when a solid becomes a liquid and when a liquid becomes a gas.
The physical means of separating a heterogeneous mixture of salt and sand.
Solving a problem using the scientific method.

Please discuss these statements.

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This solution is provided in 1,345 words and attached in both .doc and .pdf format. It discusses each statement and provides references to further learning about the topic of general chemistry.