1. Make sure you understand what a controlled experiment is.
2. How do you find the density of an unknown sample?
3. How do we know if something has undergone a physical change or a chemical change.
4. Explain the concept "law of conservation of matter".
5. Understand the states of matter and how they can change from one state to another.
6. Explain how, use scientific vocabulary, a solid can go to a gas and how that gas can go back to a solid.
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