4.22 - Redox Reactions in Group 7 Flashcards
In groups 1 and 2, where are reactions the most vigorous?
At the bottom
In group 7, where are reactions the most vigorous?
At the top
What are the products of these redox reactions?
Ionic solids (salts) which are usually white
What does the halogen act as in all of these reactions?
An oxidising agent
In terms of electron transfer, what does this mean?
Electrons are transferred to the halogen
What is the change in oxidation number for the halogen?
0 to -1
What is the change in oxidation number for group 1 and group 2 metals respectively?
0 to +1 for group 1, and 0 to +2 for group 2
What can a reactive halogen do?
Replace a less reactive halogen from one of its compound
What type of reaction is this?
Displacement
What can chlorine displace?
Bromine and iodine
What can bromine displace?
Iodine
What can iodine displace?
Neither chlorine nor bromine
What type of solution do these reactions occur in?
Aqueous solutions
Thus, what are reactions indicated by?
A colour change
What is a problem with this fact?
The colour changes are very discrete, and the colours vary with concentration, making decisions about reactions hard to make
