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Grade. 7. Sci e nce. Homogeneous. &. Heterogeneous Mixtures. Homogeneous. Mixture. Stainless steel. •. also called solutions can be solid, liquid or gas. •. •. the particles are evenly mixed so that no n e of the origi n al sub s tances are visi b le. Koo l - aid. •.

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  1. Grade 7 Science Homogeneous & Heterogeneous Mixtures

  2. Homogeneous Mixture Stainlesssteel • alsocalled solutions canbe solid,liquid or gas •

  3. • theparticles areevenlymixedso thatnoneof theoriginalsubstancesare visible Kool-aid

  4. • they appear tobe ONE substance light passesthrough unaffected •

  5. Heterogeneous Mixtures • alsocalled mechanical mixtures canbe solid, liquid or gas • Granolabar

  6. • thedifferentparts arevisibletotheeye(mayneedamicroscope) the particlesdonot evenlymix • Concrete

  7. • Light will reflectperpendicularto thedirectionof the beam

  8. Student Activity... • Createachartandlistthe varioushomogeneousandheterogeneousmixturesinyourhome. Sharewithyourshoulder partnerandaddtoyourlist. •

  9. The Tyndall Effect • A phenomenonthat canbe used to distinguish betweensolutions andwhat appears solution cannotbe usedto to be a • distinguish betweena solution and a pure liquid

  10. In a Solution... • Light passes unaffected(if astudentlooksat the beakerperpendicularto thedirectionof thebeam theywill NOTsee it

  11. In a Mechanical Mixture... • The light will scatter asit passesthrough the mixture becauseall particles arenotdissolved(as shown onthe left)

  12. Both Hetero and Homogenoeus Mixtures? CompleteActivity 7-1C Page238 & 239

  13. Post Activity Discussion... Enrichment

  14. Colloids

  15. Dispersions

  16. Emulsions

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