Group 7 - Halogens Flashcards
What is the name and the symbols of the first metals
F - Fluorine
Cl - chlorine
Br - bromine
I - iodine
What is so significant about group 7
They have 7 electrons in their outer shell - similar chemical properties
What is the test for chlorine using damp blue litmus paper
The chlorine will bleach the blue litmus paper, turning it white. It may also turn red for a moment because the solution of chlorine is acidic
What’s the theme for halogens
The reactivity decreases going down. This means it’s easier to attract an electron the more reactive the halogen will be
What happens as you go down group 7
The melting points and boiling points will increase
At room temperature… how does chlorine ( Cl2) react
It’s fairly reactive, poisonous, green gas
At room temperature… how would bromine (Br2) react
It is poisonous, red-brown liquid which gives off orange vapour at room temperature
At room temperature… how would Iodine (I2) react
It is a dark grey crystalline which gives off purple vapour
What happens to halogens higher up in group 7
They are more reactive because they can attract the outer electron of the metal more easily
What is produced when the halogens react with hydrogen
The reaction with hydrogen forms hydrogen halides
Hydrogen halides example … Hydrogen and chlorine
Hydrogen + chlorine —> hydrogen chloride
As well as reacting to hydrogen, what else can the halogens react with?
Metals
How does the halogen react with metal
They will react vigorously with SOME metals to form salts called Metal halideS
Example reaction for halogens reacting with metals… sodium and chlorine
Sodium + Chlorine —> sodium chloride
What is the symbol reaction for sodium and chlorine
2Na + Cl2 —> 2NaCl
