14 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