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Unit 6:
| Term | Definition |
|---|---|
| Avogadro's number | is the number of particles in exactly one mole of a pure substance |
| molar mass | the mass of one mole of a pure substance is called the molar mass of that substance |
| mole | the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12 |
| molecule | a neutral group of atoms that are held together by covalent bonds |
| scientific notation | the method of expressing a quantity as a number multiplied by 10 to the appropriate power |
| formula unit | the simplest collection of atoms from which an ionic compound's formula can be written |
| molecular mass | a compound calculated by adding the masses of the elements present in a mole of the molecule or formula unit that make up a compound |
| atomic mass | the weighted average of the atomic masses of the naturally occurring isotopes of an element |
| molecular formula | a chemical formula that shows the number and kinds of atoms in a molecule but not the arrangement of the atoms |
| density | the ratio of the mass of a substance to the volume of the substance; often expressed as grams per cubic centimeter for solids and liquids and as grams per liter for gases |
| formula mass | the sum of the average of all atoms represented in the formula of any molecule, formula unit, or ion |
| percent composition | the percent age by mass of each element in a compound |
| empirical formula | a chemical formula that shows the composition of a compound in terms of a relative number and kinds of atoms in the simplest ration |
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