Apure substance that contains more than one atom is called a(

a) element
b) mixture
c) compound
d) precipitate

Nonpoint source pollution is difficult to control because it

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Air can be considered a mixture. which statement does not explain why?