Group 7 Flashcards
1
Q
Appearance of Cl2 at room temperature
A
Green gas
2
Q
Appearance of Br2 at room temperature
A
Red-brown liquid
3
Q
Appearance of I2 at room temperature
A
Black solid
4
Q
Disproportionation
A
A reaction where the same element is both reduced and oxidised
eg Chlorine and water:
5
Q
oxisdising power of halides
A
- decreases down the group
- due to ability to attract electrons (electronegativity) decreses due to the incresing number of shells
- Cl
- Br
- I
- displace the ones below eachother
6
Q
atomic radius
A
- increases down the group
- incresed sheliding
- less attraction
7
Q
bleach
A
made from cold aq NaOH + Cl2
8
Q
reducing power
A
- increases down the group
- greater the reducing power the longer the reaction as the halide is powerful to reduce more species
9
Q
tests for ions
with silver nitrate
A
- Cl - white ppt
- Br - cream ppt
- I - yellow ppt
10
Q
dissolving in ammonia
Cl , Br , I
A
- Cl - dissloves in dilute and concentrated
- Br - only dissolves in concenrated
- I - does not dissolve
11
Q
What is the test for HCl?
A
Turns blue litmus paper red
