1 / 16

Grade 7 Science

Grade 7 Science. Homogeneous & Heterogeneous Mixtures. Homogeneous Mixture. also called solutions can be solid, liquid or gas. Stainless steel. the particles are evenly mixed so that none of the original substances are visible. Kool-aid. they appear to be ONE substance

tyrone
Download Presentation

Grade 7 Science

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related