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Unit 5: Composition
Chemical Composition
Term | Definition |
---|---|
Formula | Element symbols and subscripts used to represent the chemical composition of a substance |
polyatomic ion | a tightly bound group of atoms that behaves as a unit and has a positive or negative charge |
Empirical formula | smallest ratio of the atoms of each element in a compound |
Molecular Formula | actual number of atoms of each element in a molecule |
Coefficient | number placed before a formula indicating the number of units of that substance |
percent composition | Percent of each element in a compound |
percent error | the percent that a measured value differs from the accepted value |
hydrate | compound that has water chemically attached between its ions and written into its chemical formula |
gram atomic mass | The mass in grams of 1 mole of atoms for an element |
gram formula mass (GFM) | the mass of one mole of a substance (Found by adding up all elements contained within a compound/element using the periodic table) |
A mole | 6.02 x 10²³ particles of a substance |