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Heterogeneous Mixture Mixtures do not always contains the same proportions of the substance that make them up. A mixture in which different materials can be distinguished easily is called a heterogeneous mixture. A mixture in which different materials can be distinguished easily is called a heterogeneous mixture.

Example:  Example – Granite rock, concrete, and dry soup. Also, you could pick off the pizza toppings that you don’t like.

More Examples:  The clothes you wear, such as your jeans, shirts, or any material that contains 2 or more fibers.  Example: Cotton and Polyester.  Some heterogeneous mixtures we can see, but some we don’t see.

Example  Example: cheese – It is made of milk, proteins, butterfat, colorings and food additives.

Homogenous AAAA homogeneous mixture contains two or more gases, liquids, or solid substances blended evenly throughout.

Examples  Examples:  Soda  Vinegar

Extra  Another name for a homogenous mixture is a solution.  A solution is a homogenous mixture of particles so small that they cannot be seen with a microscope and will never settle to bottom of their container.

Colloids  A colloid is a type of mixture that never settles. Its particles are larger then those in a solution buy not heavy enough to settle.  In Greek, the word colloid means “glue”. *A colloid is a homogenous mixture* (write that in your notes)

Examples of Colloids  Milk – water, fats, and proteins  The first colloids studied were in a gelatin.  Paints are colloids,  Fog and smoke – thick gases mixed with different particles that don’t settle.

Detecting Colloids  One way to distinguish a colloid from a solution is by its appearance.  Fog appears white because its particles are large enough to scatter light.

The light test  You can tell for certain if a liquid is a colloid by passing a beam of light through it.  A light beam is invisible as it passes through a solution, but can be seen readily as it passes through a colloid.

Passing a beam of light through a substantance. (colloid)

The scattering  The scattering of light is called the Tyndall Effect.

Tyndall Effect

Suspensions  Some mixtures are neither solutions nor colloids. A suspension, which is a heterogeneous mixture contains a liquid in which the particles never settle to the bottom.

Example  Pond water  River Deltas