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pure substance composed of only one type of atom; cannot be broken down into another substance by physical or chemical means
a pure substance that is formed when two or more different elements that are chemically combined
when two atoms share electrons, such as hydrogen sharing oxygen in water, the force that holds them together is called........
a bond with an electrical attraction between two oppositely charged atoms or groups of atoms call ions
van der Waals forces
the attraction between molecules caused by positive and negative charges when they become close together
process by which atom or groups of atoms are reorganized into different substances
the minimum amount of energy needed for reactants to form products in a chemical reaction
a weak interaction involving a hydrogen atom and a fluorine, oxygen, or nitrogen atom.
a mixture in which one or more substances (solutes) are distributed evenly in another substance (solvent)
small compounds that are made of carbon, nitrogen, oxygen, hydrogen, and sometimes sulfer
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