1. Mixtures Unit 1: Measurement & Matter

2. 2 Categories of Matter  Pure Substances  Mixtures

3. Pure Substances  Composition is the same throughout and does not vary from sample to sample.  CANNOT be broken down by physical changes  Can be an element or compound.

4. Mixture  2+ pure substances that are mixed together but NOT joined chemically  Examples: The air we breath, gasoline for cars, the sidewalk on which we walk

5. A mixture of 2 elements A mixture of two elements, e.g. neon (Ne) and hydrogen (H 2 )

6. A mixture of 1 element and 1 compound A mixture of one element and one compound, e.g. hydrogen (H 2 ) and ammonia (NH 3 )

7. A mixture of 2 compounds A mixture of two compounds, e.g. water vapour (H 2 O) and carbon dioxide (CO 2 )

8. Homogeneous Mixtures  Uniform in composition and appearance  Same proportion of components throughout  Consists 2+ substances in the same phase  Also called solutions

9. Heterogeneous Mixtures  variable appearance and composition

10. Let’s classify Kool-Aid

11. Kool Aid has mass and takes up space

12. Can be separated by allowing water to evaporate

13. Same composition throughout

14. You Decide!  Look at the following examples and with your partner determine if it is a heterogeneous mixture, homogeneous mixture, or a pure substance

15. Chicken Noodle Soup Heterogeneous

16. Pure Water Pure substance

17. Tap Water Homogeneous

18. Coca-Cola Homogeneous

19. Oreo McFlurry Heterogeneous

20. Gold Not a Mixture!!

21. Coffee Homogeneous

22. Review: Mixtures  Two or more ________________ or _________________ NOT chemically combined.  No reaction between substances.  Mixtures can be uniform (called ________________________) and are known as solutions.  Mixtures can also be non-uniform (called ________________________).  Mixtures can be separated into their components by ________________ or ________________ means.  The properties of a mixture are similar to the properties of its ________________.

23. Homework  HW 1.10 - Online Homework (Describing Matter) due TONIGHT 8pm  HW 1.11 - Read p. 40-41 by Mon. 9/22/14  HW 1.12 - Read p. 49-50 by Tues. 9/23/14