The Halogens Flashcards
What happens down the halogen group in terms of boiling point?
It increases
Explain the trend in boiling point down the halogen group
Id-Id or London forces increase so more energy is needed to overcome them
What happens down the halogen group in terms of reactivity with halide ions?
Decreases
Explain the trend in reactivity down the halogen group with halide ions
The added electron is further from the nucleus and it shielded by more electrons in inner shells so the electrostatic attraction decreases and so reactivity decreases
What are displacement reactions in terms of halogens?
Reactions in which a more reactive halogen will oxidise and displace a less reactive halogen from its salt
What can halogen solutions be added to, to produce displacement reactions?
NaCl
NaBr
NaI
What is the colour of chlorine in water?
Pale green
What is the colour of bromine in water?
Orange
What is the colour of iodine in water?
Brown
What is the colour of chlorine in cyclohexane?
Pale-green
What is the colour of bromine in cyclohexane?
Orange
What is the colour of idoine in cyclohexane?
Purple
What happens to show that a redox reaction has taken place with halogens reacting with halide ions?
A colour change
What is usually also added to the solution of halogen and sodium halide?
Usually shaken with cyclohexane to distinguish between bromine and iodine
Which halogen in the most reactive?
Chlorine
