Acid
Compound that gives off H+ ions in solution.
Base
Substance which gives off hydroxide ions (OH-) in solution.
Atom
The smallest object that retains properties of an element. Composed of electrons and a nucleus (containing protons and neutrons).
Compound
Two or more atoms joined together chemically, with covalent or ionic bonds.
Electron
One of the parts of the atom having a negative charge. Indivisible particle with a charge of -1.
Element
Substance consisting of only one type of atom.
Volume
Measures the size of an object using length measurements in three dimensions. A good way to measure liquid quantities.