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Sample of matter, either a single element or
a single compound, that has a definite
chemical & physical properties
Made of only 1 type of particle
 Elements or Compounds
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Elements – made of atoms
Compounds – made of molecules
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A substance that can’t be separated or
broken down into simpler substances by
chemical means
Pure substance
Can’t be broken down at all
Made of one type of atom
Found listed on Periodic Table
Substance made up of atoms of 2 or more different
elements chemically combined with specific mass
ratio
 Can only be separated by chemical changes
 Made only of molecules
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 H20: Water
 NaCl: Salt
 C6H12O6: Sugar
 Fe2O3: Rust
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Properties of compound are completely different
from the properties of elements that formed it
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Combination of 2 or more substances that
are not chemically combined
2 or more things physically in the same
place
 Examples: Salad, Cereal, Pizza, Omelette
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Looks like or appears to be only 1 substance
Example
 Gatorade
 Lemonade
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Looks like or appears to be more than 1
substance
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A homogeneous mixture of 2 or more
substances evenly dispersed throughout a
single phase
Looks like one thing
Usually when 1 substance is dissolved in
another, but not always
 Examples: Lemonade, Air, Bronze, Gatorade
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Ability of 1 substance to dissolve in another
To dissolve more quickly: Crush it, Stir it,
Heat it
Solute – the substance that is dissolved
Solvent – what substance is being dissolved
in
 Example: Sugar dissolves in water
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A mixture in which particles of a material
are more or less evenly dispersed throughout
a liquid or gas
When you shake it, it looks like one thing,
but if you leave it setting, particles will
settle to bottom
 Example: Snow Globe
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Mixture consisting of tiny particles that are
intermediate in size between those in
solutions and those in suspensions
Particles aren’t so small that they
completely dissolve like solutions, but
aren’t so big they settle
 These particles can scatter light
 Example: Milk, Mayo, Deodorant