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Unit 6: Vocab Words
Term | Definition |
---|---|
Avogadro's number | 6.02x10 23 , the number of atoms or molecules in 1 mol |
molar mass | the mass in grams of 1 mol of a substance |
mole | the SI base unit used to measure the amount of a substance whose number of atoms of carbon in exactly 12 g of carbon-12 |
molecule | a neutral group of atoms that are held together by covalent bonds |
Scientific notation | a 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 | is an essential part of identifying an unknown compound and determining the structure of a molecule of the compound |
atomic mass | is a relative measure, masses of atoms expressed in grams are very small |
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 atomic masses of all atoms represented in the formula of any molecule, formula unit or ion |
Percent composition | the percentage by mass of each element in a compound |
Empirical formula | a chemical formula that shows the composition of a compound in terms of the relative numbers and kinds of atoms in the simplest ratio |