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13. What are examples of Pure Substances?
14. What are examples of Mixtures?
15. What is a definition of Matter?

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10. What happens when oil is added to water?
11. Why does this happen?
12. How are water and oil different?

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4. When you feel “wind” from a fan, what are you actually feeling and Why?
5. What is air?
6. Is air all the same substance, or is it made up of more than one substance?

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1. What happens to salt when it is added to water?
2. If the salt material "disappears" where does it go?
3. Has it really ceased to exist?

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7. How are the three samples of water (hot, warm, ice cold) the same?
8. How are they different?
9. How could they change?