What Are The Reactions Of Halogens | Reactions | Chemistry | FuseSchool
Channel: FuseSchool - Global Education
Date: 2016-03-21

Learn the basics about the reactions of halogens, when learning about the periodic table as a part of properties of matter.

Group 7 of the periodic table is the halogens.

The reaction between diatomic chlorine gas and cold sodium hydroxide solution is very popular in industry because the resulting mixture of the three products works perfectly as a bleach.

Different halogens can react with each other. Chlorine and iodine can react together to form iodine monochloride, which is a brown liquid and vapour. 

The halogen Fluorine can be reacted to produce hydrofluoric acid, which is a really dangerous acid. It cannot be stored in glass bottles, like other acids are. Hydrofluoric acid is so corrosive that it can attack and dissolve glass. It does this by forcing the silicon dioxide component of the glass, which is usually chemically inert, to react, forming silicon tetrafluoride and water. It’s the only acid capable of doing this.

Hydrofluoric acid can only be stored in certain types of plastic, which are resistant to its corrosive power. But we can exploit this power too: hydrofluoric acid is used industrially to create patterns on glass, a technique called ‘etching’.

Iodine is another halogen, and it is used to test for the presence of starch. An interesting use of testing for starch is to detect fake banknotes. The paper used to print official banknotes is starch-free, but most common types of paper contain starch and the ink will show up blue.

SUBSCRIBE to the Fuse School YouTube channel for many more educational videos. Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT.

JOIN our platform at www.fuseschool.org

This video is part of 'Chemistry for All' - a Chemistry Education project by our Charity Fuse Foundation - the organisation behind The Fuse School. These videos can be used in a flipped classroom model or as a revision aid. Find our other Chemistry videos here: 

https://www.youtube.com/playlist?list=PLW0gavSzhMlReKGMVfUt6YuNQsO0bqSMV

Twitter: https://twitter.com/fuseSchool
Access a deeper Learning Experience in the Fuse School platform and app: www.fuseschool.org
Follow us: http://www.youtube.com/fuseschool
Friend us: http://www.facebook.com/fuseschool

This Open Educational Resource is free of charge, under a Creative Commons License: Attribution-NonCommercial CC BY-NC ( View License Deed: http://creativecommons.org/licenses/by-nc/4.0/ ).  You are allowed to download the video for nonprofit, educational use. If you would like to modify the video, please contact us: info@fuseschool.org