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Understanding Homogeneous and Heterogeneous Mixtures in Grade 7 Science

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In Grade 7 Science, students explore homogeneous and heterogeneous mixtures. Homogeneous mixtures, also known as solutions, can be solid, liquid, or gas, with particles that are evenly mixed, making them appear as one substance, like Kool-Aid or stainless steel. In contrast, heterogeneous mixtures, or mechanical mixtures, have visibly distinct parts, such as granola bars or concrete, where particles do not mix evenly. Activities include observing mixtures at home and learning about the Tyndall Effect to distinguish between solutions and pure liquids through light scattering.

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Understanding Homogeneous and Heterogeneous Mixtures in Grade 7 Science

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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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