1. Grade 7 Science Homogeneous & Heterogeneous Mixtures

2. Homogeneous Mixture also called solutions can be solid, liquid or gas Stainless steel

3. the particles are evenly mixed so that none of the original substances are visible Kool-aid

4. they appear to be ONE substance light passes through unaffected

5. Heterogeneous Mixtures also called mechanical mixtures can be solid, liquid or gas Granola bar

6. the different parts are visible to the eye (may need a microscope) the particles do not evenly mix Concrete

7. Light will reflect perpendicular to the direction of the beam

8. Student Activity... Create a chart and list the various homogeneous and heterogeneous mixtures in your home. Share with your shoulder partner and add to your list.

9. The Tyndall Effect A phenomenon that can be used to distinguish between solutions and what appears to be a solution cannot be used to distinguish between a solution and a pure liquid

10. In a Solution... Light passes unaffected (if a student looks at the beaker perpendicular to the direction of the beam they will NOT see it

11. In a Mechanical Mixture... The light will scatter as it passes through the mixture because all particles are not dissolved (as shown on the left)

12. Both Hetero and Homogenoeus Mixtures? Complete Activity 7-1C Page 238 & 239

13. Post Activity Discussion... Enrichment

14. Colloids

15. Dispersions

16. Emulsions