| A | B |
|---|
| compound | substance composed of two or more different elements, the atoms of which are chemically united |
| proton donor | an acid that dissolves in water and release a hydrogen ion |
| inorganic compound | a compound that lacks carbon |
| ion | an atom with a positive or negative electric charge |
| atomic weight | average of the mass numbers of all of the isotopes of an element |
| energy | the ability to do work |
| acid | a substance that liberates hydrogen ions when in an aqueous solution |
| covalent bond | a bond involving the sharing of electrons between atoms |
| neutron | uncharged subatomic particle |
| hydrogen bond | weak bond in which a hydrogen atom forms a bridge between two elecron-hungry atoms |
| salt | ionic compound that dissociates into charged particles when dissolved in water |
| organic compound | a compound containing carbon |
| electron | negatively charged subatomic particle |
| nucleic acid | class of organic molecules that include DNA and RNA |
| matter | anything that occupies space and has mass |
| atomic number | the number of protons in an atom |
| molecule | particle consisting of two or more atoms held together by chemical bonds |
| ATP (adenosine triphosphate) | the compound that is the important intracellular energy source |
| isotope | different atomic form of the same element |
| base | a substance that accepts hydrogen ions |
