6. Heterogeneous
Mixtures
• In a heterogeneous mixture, the parts of
the mixture are noticeably different from
one another
7. Homogeneous
Mixtures
• In a homogeneous mixture, the substances
are so evenly distributed that it is difficult
to distinguish one substance in the mixture
from another
8. Solutions, Suspensions,
and Colloids
• Based on the size of its largest particles, a
mixture can be classified as a solution, a
suspension, or a colloid
9. Solutions
• When substances dissolve and form a
homogeneous mixtures, the mixture that
forms is called a solution
11. Colloids
• A colloid contains some particles that are
intermediate in size between the small
particles in a solution and the larger
particles in a suspension
12. Physical Properties
• Viscosity, conductivity, malleability,
hardness, melting point, boiling point, and
density are examples of physical properties
13. Viscosity
• The tendency of a liquid to keep from
flowing-its resistance to flowing-is called its
viscosity
16. Density
• Used to test the purity of a substance
• Mass/Volume=Density
17. Using Physical
Properties
• Physical properties are used to identify a
material, to choose a material for a specific
purpose, or to separate the substances in a
mixture
18. Using Properties to
Separate Mixtures
• Filtration and distillation are two common
separation methods
21. Evaporation
• a process used to isolate a solid dissolved
in a liquid
• Disclaimer- you are not going to isolate a
pure sample of all components of the
mixture!
22. Physical/Chemical
Change
• A physical change occurs when some of the
properties of a material change, but the
substances in the material remain the same
• A chemical change occurs when a
substance reacts and forms one or more
new substances
23. Chemical Properties
• Chemical Properties can be observed only
when the substances in a sample of matter
are changing into different substances.
25. Reactivity
• The property that describes how readily a
substance combines chemically with other
substances in reactivity
26. Recognizing Chemical
Change
• Three common types of evidence for a
chemical change are a change in color, the
production of gas, the formation of a
precipitate, and a change in temperature
27. How can you distinguish a
physical change from a
chemical change?
28. List four pieces of evidence
that show something is a
chemical change?
29. What is the difference
between a physical and
chemical change?
30. What is the technique
for a chemical
separation?