intro to chem

• atom

  the smallest particle of matter and is made up of protons neutrons and electrons
• element

  only made up of one sort of atom. they are listed in the periodic table
• molecule

  two or more atoms covalently bonded together. the atoms can be of the same element or different elements
• compound

  has two or more different types of atom bonded together. the bonding can be either ionic or covalent
• mixture

  has two or more different elements and/or compounds in the same space. they can be seperated into the individual components
• acid

  a substance that donates H+ ions
• base

  a substance that accepts H+ ions
• alkali

  a base that releases hydroxide ions in aqueous solutions
• a salt is formed when

  the hydrogen ions from an acid are replaced by a metal or ammonium ion