The film explains the concept of chemical changes, where two or more materials combine to form entirely different substances. It highlights everyday examples of chemical changes, such as burning ...

Chemical reactions make new chemicals. Atoms are rearranged during a chemical reaction, but the number of atoms does not change. Evidence of chemical reactions includes a large temperature change ...

Small molecules have critical roles at all levels of biological complexity and yet remain orphans of the central dogma. Chemical biologists, working with small molecules, expand our understanding ...