1. Mixtures: Homogeneous and heterogeneous Mixtures
Matter
Mixtures: Homogeneous and heterogeneous Mixtures

2. Matter – Mixtures Review
A mixture:
is made from different pure substances (elements, compounds, or both) that are not chemically joined
is held together by physical forces, not chemical
can be separated physically (filtration, evaporation, distillation)
examples: ocean water, air, soil, vegetable soup

3. Matter – Mixtures
Most substances that you find in nature, as well as most human-made substances, are mixtures of one or more pure substances.
Mixtures can be classified as either homogeneous or heterogeneous.
The difference between a homogeneous mixture and a heterogeneous mixture is how well the materials are mixed together and how uniform its composition is.

4. Matter – Homogeneous Mixtures
A homogeneous mixture:
has a uniform appearance; it looks the same throughout
has a uniform composition; it’s made of the same types of particles
all the substances that make up the mixture are evenly distributed
it can be separated physically

5. Matter – Homogeneous Mixtures - Solutions
One type of homogeneous mixture is a solution:
a mixture made of two or more pure substances
the particles that make up a solution are too small to be seen
examples: salt water, tea, mouthwash, air, alloys (mixture of different metals)

6. Matter – Homogeneous Mixtures - Solutions
A solution is formed when one substance dissolves in another substance:
solute – the substance that dissolves
solvent – the substance that does the dissolving
the solvent dissolves the solute
there is usually more solvent than solute
example: salt (solute) dissolves in water (solvent)

7. Matter – Homogeneous Mixtures - Solutions

8. Matter – Heterogeneous Mixtures
A heterogeneous mixture:
consists of visibly different substances or states of matter
substances remain separate
the different substances in the mixture can typically be separated easily
examples: iced tea (solid ice and liquid tea), pizza, blood, cereal in milk

9. Matter – Heterogeneous Mixtures: Suspensions
One type of heterogeneous mixture is a suspension:
made of larger, visible particles that do not dissolve
solid particles will settle and separate over time if left alone
examples: pulpy orange juice, tomato juice, sand in water, Chex Mix

10. Matter – Heterogeneous Mixtures: Suspensions