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Chem. Vocab.
02/02/12
Question | Answer |
---|---|
particle | Small portion of matter |
molecule | Two or more atoms chemically combined. |
atom | The smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons). |
Formula Unit | The smallest repeating unit of a substance. The molecule for nonionic substances |
Molar Mass | is a unit that enables scientists to calculate the weight of any chemical substance, be it an element or a compound. Molar mass is the sum of all of the atomic masses in a formula. More information and molar mass calculator. |
mole | A collection of 6.023* 1023 number of objects. Usually used to mean molecules. |
percent composition | Expresses the weight ratio between different elements in a compound. |