Elements, Compounds, and Mixtures
Sodium
Sodium Chloride
Salt Water
Elements
Elements are pure substances that
cannot be broken down into other
substances
Compounds
Compounds are pure substances
made of 2 or more elements
chemically combined.
Examples:
CO2 is Carbon Dioxide
CO is Carbon Monoxide
C12H22O11 is Sugar
Compounds
In a compound, the properties are
different from those of the individual
elements.
C12H22O11 is Sugar
Carbon is a black solid
Hydrogen is a gas
Oxygen is a gas
Compounds
What is the difference between a molecule
and a compound?
Molecule: Particle made of two or more
atoms bonded together
Compound: Substance made of two or
more elements chemically combined
O2 is a molecule
CO2 is a molecule and a compound
Mixtures
Mixtures are 2 or more substances that
are mixed together but not chemically
combined.
Examples:
Soil
Ice Cream
Salad
Bowl of Cereal with Milk
Mixtures
In a mixture, the properties of each
individual substance stay the
same.
The cereal stays cereal
The milk stays milk
Heterogeneous mixtures
Mixtures where the substances are unevenly
distributed throughout the mixture
Homogeneous mixtures
Mixture where the substances are evenly
distributed throughout the mixture
Peanut Butter
How to tell . . .
• If it is on the periodic table . . . Element
• If it has a chemical formula . . . Compound
– CO2
– H2O
– Na2CO3
• Anything else . . . Mixture