GROUP 7 Flashcards
1
Q
Explain the trend in boiling points down Group 7.
A
- Increase down Group 7
- More electrons
- Stronger Van Der Walls’ forces
- More energy needed to break them
2
Q
Describe the trend in reactivity down Group 7.
A
- Decreases down the group
- More shells
- More shielding
- More repulsion
- Increasingly harder for atoms to gain an electron
3
Q
Explain why Cl₂ is a more powerful oxidising Br₂.
A
- Cl has less shells
- Smaller atomic radius
- Less electron shielding
- Greater nuclear attraction
- Cl is more able to gain an electron
4
Q
Explain why the iodide ion is a more powerful reducing agent than the chloride ion.
A
- Iodide has more shells
- More shielding
- Larger atomic radius
- Weaker nuclear attraction
- I loses electrons more easily
- I can cause another species to gain electrons more easily
5
Q
chlorine + water
A
Cl₂ + H₂O = HCl + HClO
6
Q
chlorine + sodium hydroxide
A
Cl₂ + 2NaOH = NaCl + NaClO + H₂O
7
Q
chlorine + hydrogen gas
A
H₂ + Cl₂ = 2HCl
8
Q
chlorine + sodium metal
A
Cl₂ + 2Na = 2NaCl
9
Q
chlorine + potassium iodide
A
Cl₂ + 2KI = 2KCl + I₂
10
Q
CHLORIDE
BROMIDE
IODIDE
A
Green
Orange
Brown/Purple
