28.) a solid has a definite shape and a definite volume.
29.) These two opposite ions attract each other and form the ionic bond. Covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.
30.) scientists use scientific notation to help shorten long numbers. an example is 23^7.
31.) one example of a chemical change is change in color.
