More Reactive Halogens will Displace Less Reactive Ones Flashcards
What kind of reactions do elements in group 7 take part in?
Displacement reactions
What is a displacement reaction?
Where a more reactive element ‘pushes out’ (displaces) a less reactive element from a compound
Which is more reactive and how can we tell - chlorine or iodine?
Chlorine - higher up in group 7
What happens if you add chlorine water to potassium iodide solution?
The chlorine will react with the potassium in the potassium iodide to form potassium chloride
What is displaced?
The iodine and is left in the solution, turning it brown
Check table page 33
Ok
Chlorine water reacting with potassium bromide solution?
Orange solution (Br2) formed
Chlorine water reacting with potassium iodide solution?
Brown solution (I2) formed
Bromine water reacting with potassium iodide solution?
Brown solution (I2) formed
What do all the other reactions form?
No reaction
How do you figure this out?
By adding a few drops of the halogen solution to the salt solution
