1.8 The Halogens Flashcards
What do all the halogens have in common?
They are all diatomic.
What block of the periodic table are the halogens in?
p-block
Give one application of a halogen.
Fluoride ion is used in NaF to fluoridate water.
As you go down the halogens, what happens to the melting and boiling points?
Melting and boiling points increase down the group.
Appearance of fluorine at room temperature
Pale yellow gas
Appearance of chlorine at room temperature
Green gas
Appearance of bromine at room temperature
Red-brown liquid
Appearance of iodine at room temperature
Grey-black solid
What happens to the reactivity of the halogens as you go down the group?
Reactivity of the halogens decreases.
What colour is iodine vapour?
Purple
What state can iodine not be in?
Liquid state
Why do the halogens dissolve well in hexane but not well in water?
Halogens are non-polar substances. Hexane is non-polar but water is polar.
Which two substances can chlorine and bromine dissolve in to a small extent?
Water and benzane
Colour of chlorine in water
Colourless
Colour of bromine in water
Orange
