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Unit 4 Notes: Mixtures,
Elements and Compounds

Essential Question:
– How are mixtures, elements and compounds
different from each other?
– Give an example of each
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Examples of properties:
Chemical
Physical
Flammability
Density
Reactivity
Mass
Acidity
Melting point
Alkalinity
Boiling point
Rusting
Color
Exploding
Volume
Corroding
Specific heat capacity
Precipitate
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Mixture:

A physical blend of two or more
substances.
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Homogeneous Mixture:

A mixture in which the composition is
uniform throughout. Another name for a
homogeneous mixture is solution.
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Heterogeneous Mixture:

A mixture in which the composition is not
uniform throughout.
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Separating Mixtures

Differences in physical properties can be
used to separate mixtures.
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Filtration:

The process of separating a solid from a
liquid in a heterogeneous mixture.
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Distillation:

Liquid is boiled to produce a vapor that is
then condensed into a liquid. The
difference in boiling points causes the
separation.
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Evaporation:

Evaporating the liquid phase of a mixture
which leaves behind the solid(s) dissolved
in the liquid solution.
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Element:

Simplest form of matter that has a unique
set of properties
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Compound:

A substance that contains two or more
elements chemically combined in a fixed
proportion.
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
Compound are broken down by chemical
changes. Heating is one of the processes
used to break down compounds into
simpler substances.
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Properties of compounds compared to
their individual elements are very
different.
 H2 + O2  2 H2O


2 Na + Cl2  2 NaCl
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Pure substance
Copper
Mixture
Sodium Chloride
Element
Compound
Air
Sand
Heterogeneous Mixture
Homogeneous mixture
Matter
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