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Molecules&Compounds

Periodic Table

What is the difference between a molecule and a compound? Molecule : two or more elements combined (same or different) Compound : two or more elements that are DIFFERENT!!!
The building blocks of matter (make up everything) Atom
A substance consisting of a single type of atom Element
Chemical Formula The recipe for a chemical substance - uses symbols for the elements present and subscripts (small numbers) to indicate the number of elements Ex. H₂O - water
Chemical Equation 2H₂ + O₂ → 2H₂O 2 hydrogen molecules + 1 oxygen molecules = 2 water molecules
Coefficient The number in front of the element symbol (called a coefficient) indicates the number of molecules. If no coefficient appears in front of a molecule, we interpret this as meaning one.
Created by: jspielman
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