Grade 7 Science Homogeneous & Heterogeneous Mixtures.

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Presentation transcript:

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 light passes through unaffected

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

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

Light will reflect perpendicular to the direction of the beam

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.

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

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

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)

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

Post Activity Discussion... Enrichment

Colloids

Dispersions

Emulsions