Graphology - the study of handwritings; autograph - written with one's own hand; seismograph - a machine noting strength and duration of earthquakes. marina - a harbor for pleasure boats; maritime - relating to the sea; submarine - an undersea boat; aquamarine - color of sea water.
Chemicals are classified into various hazard classifications in accordance with their physiochemical properties and health hazards. Each class of chemical has a pictorial symbol called a danger symbol.
Naming Chemical Compounds. Chemical compounds can be divided into two basic types, ionic and covalent. Ionic compounds are easily recognized because they contain a metal and a. nonmetal. Covalent compounds are those which contain only nonmetals. The. periodic table in the front cover of your text shows which elements fall into each. class.