Group 7 Flashcards
(11 cards)
1
Q
Summarise F2
A
- bright yellow gas
- very reactive
- toxic
2
Q
Summarise Cl2
A
- greeny yellow gas
- very reactive
- toxic
3
Q
Summarise I2
A
- grey crystals
- reactive
- toxic
- turns into purple vapour on heating
- used in solutions as an antiseptic
4
Q
Summarise Br2
A
- orange liquid
- very reactive
- toxic
5
Q
How does electronegativity change down group 7?
A
- decreases
- because more shielding
- increases the distance between nucleus and free electrons
- decreases the effect of nuclear charge
6
Q
How does boiling point change down group 7?
A
- it increases
- because more electrons
- so more van der waals forces
7
Q
List the 3 main halogens in order of strongest to weakest oxidising agent and explain why
A
- chlorine
- bromine
- iodine
- chlorine is most electronegative so it can reduce and gain electrons the easiest
8
Q
List the three main halides in order of strongest to weakest reducing agent and explain why
A
- iodide
- bromide
- chloride
- iodide has a larger atomic radius so it can be oxidised and lose electrons easier than chloride as there’s weaker attraction between the electrons and nuclear charge
9
Q
State and summarise the products formed when Cl- reacts with H2SO4
A
- HCl, steamy fumes
10
Q
State and summarise the products formed when Br- reacts with H2SO4
A
- HBr, steamy fumes
- Br2, brown fumes
- SO2, colorless gas
11
Q
State and summarise the products formed when I2 reacts with H2SO4
A
- HI, steamy fumes
- I2, purple fumes
- SO2, colorless gas
- S, yellow solid
- H2S, gas with bad egg smell
