FirstConcepts - First Concepts and Definitions of Chemistry...

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First Concepts and Definitions of Chemistry Chemistry - The science dealing with matter and its transformations. Matter - Anything that has mass and occupies space. Mass - The measure of the quantity of matter in anything. Atoms - The fundamental building units of which all matter is composed. Chemical symbol - One- or two-letter abbreviation for the name of an element. [Learn the names and symbols of the common elements on the hand-out "Some Common Elements".] Molecule - Chemical entity composed of a certain number of atoms with a particular shape. Molecular formula - Symbolic representation of the chemical composition of a molecule in which the number of atoms of each element is indicated by a subscript; e.g., H 2 O = 2 H atoms + 1 O atom per molecule. Heteronuclear molecule - Composed of atoms of two or more different elements; e.g., H 2 O (water) CH 4 (methane) CH 3 OH (methyl alcohol) H 2 O 2 (hydrogen peroxide) Homonuclear molecule - Composed of atoms of only one element; e.g., H 2 (hydrogen)
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FirstConcepts - First Concepts and Definitions of Chemistry...

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