29 terms

Elements, Compounds, & Mixtures

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atom
is the smallest unit of matter
element
is matter made up of only one kind of atom
Dimitri Mendeleev
Russian chemist that created the periodic table of elements
chemical symbols
are used to represent the elements on the periodic table
compound
is a pure substance composed of two or more elements chemically combined
chemical formula
is a group of chemical symbols used to represent elements in a compound
molecule
the smallest individual unit of a compound
the only way to break down a compound
is through a chemical change
one way to add energy to break down a compound
add heat
another way to add energy to break down a compound
apply an electric current
mixture
is more than one element that can be separated easily
How many ELEMENTS are in CH4?
TWO (carbon and hydrogen)
How many ATOMS are in CH4?
FIVE
What are the elements in CO2?
carbon and oxygen
atom
compound
compound
mixture
compound
element
molecule
molecule
mixture of elements & compounds
mixture of compounds
element
atoms are identical
Mixtures or Compounds
These can be broken down into simpler substances.
elements
These can join to form compounds.
compound
These have different properties than the elements themselves.
mixture
These have the same properties of the elements that make them.
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