Synthetic materials are made from natural resources. Synthetic materials are made by chemically changing the starting substances to create a material with different characteristics. Some examples of ...

Alarming examples of the dangers from chemical weapons have been seen recently in the use of industrial chemicals and the nerve agent sarin against civilians in Syria, and in the targeted ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...