Elements: Elements are composed of atoms of only one type of element. Examples: Iron metal (Fe) Sulfur (S or S8) Oxygen (O2) Bromine (Br2) Compounds: Compounds are combinations of atoms of more than one type of element. Examples: GaAs (gallium arsenide) Methane (CH4) Water (H2O) Ammonia (NH3) Molecules: Molecules are groups of atoms bonded chemically. Molecules can be elements or compounds H2 CO2 O2 CH3CH2OH Mixtures: 2 or more pure substances that exist together but are not combined chemically. Components of a mixture can be separated by physical processes.
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