![]() Each pure chemical substance ( e.g., oxygen, iron, or water) has a characteristic set of properties that gives it its chemical identity. Most of the materials that occur on Earth, such as wood, coal, minerals, or air, are mixtures of many different and distinct chemical substances. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history. ![]()
0 Comments
Leave a Reply. |