|Salt water is a both a homogeneous mixture and an ____ solution.
|Solid nonmetals are brittle, whereas metals are ____.
|An ____ reaction absorbs heat energy and thus will feel cold.
|A molecule of water is polar because it has a ____ structure.
|Glass, rocks, oils, and plastics are water ____.
|There are ____ naturally occurring elements on Earth.
|A solution with a pH less than 7 is ____.
|An ____ reaction releases heat energy and thus will feel hot.