Group 2 & 7

• What is the trend of solubility for group 2 hydroxides?

  Solubility increases as you go down the group

  as there are more OH ions released

  allowing an alkaline solution to be formed

  and the PH to increase
• What is the group 2 trend?

  metal ions get larger

  so the charge density decreases

  there is lower attraction between OH and 2+ ions

  Ions split away from each other more easily
• Why does the melting and boiling point increase as you go down group 7?

  Electrons increase

  therefore there are stronger london forces

  so more energy is needed to overcome the forces
• why does the oxidising power decrease as you go down group 7?

  Atomic radius increases

  more shielding

  these factors outweigh the increase in nuclear charge
• What is the observation when CL2 reacts with AgNO3?

  white precipitate
• what is the result when Br2 reacts with AgNO3?

  Cream precipitate
• What is the result when I2 reacts with AgNO3?

  Yellow precipitate