Read pages 41 - 44

1. What is a pure substance?
2. Is pure grape juice a pure substance?
3. What is grape juice?
4. What is air?
5. What kind of substance cannot be broken down by physical changes?
6. How are mixtures formed?
7. What kind of substances retains the properties of its components? Give an example and write how the properties are retained?

 

 

8. What kind of mixture is called a heterogeneous mixture?
9. Give an example.
10. What kind of mixture is called a homogeneous mixture?
11. Give an example.
12. How does a salt + water mixture differ from flour + water mixture?
13. What kind of mixture is Gasoline?
14. Why does gasoline look like a pure substance even though it is a mixture of at least 100 compounds?

 

 

15. What kind of mixture is oil + water?
16. THINK AND DEFINE :
1. Miscible:
2. Immiscible:
17. What kind of mixture the gases in air form?
18. What is the gas component of carbonated drinks?
19. Do gases always need pressure to form solution with liquids? Explain your answer with an example.

 

 

 

20. What is foam? Give an example of a solid foam