Everything we can see and touch, and quite a lot that we can’t as well, is made of tiny particles called atoms. Some substances, like particles of this iron, contain only one kind of atom. Iron is an ...

When traveling to the Thuringian Forest or the Harz Mountains, it is impossible to avoid coming across images that are difficult to get used to. Dead spruce trees (Picea abies) dot the landscape like ...

Students will learn how to categorize matter as either pure substances or mixtures. Students will apply tests, based on physical properties of matter samples, to determine whether a mixture is ...

Flash column chromatography is a method of chemical separation that is used to purify chemical mixtures. It is also known as flash purification, due to its function as a purification method. It is ...

In quality control and chemistry, analytical samples are usually mixtures. Understanding the main compound’s assay and the number of impurities or other unwanted substances in the sample is essential ...