Buscar
Estás en modo de exploración. debe iniciar sesión para usar MEMORY

   Inicia sesión para empezar

level: Group7

Questions and Answers List

level questions: Group7

QuestionAnswer
Halogens are joint by what forceLondon
Trends in boiling points group 7decreases down a group more electrons, stronger london forces, more energy required to break the imf ,boiling point increases
all group 7gain an electron so reduced
displacement reactions colourshallides in water = colourless cl2= pale green br2= orange I2= brown (water) = violet (cyclohexane)
Ionic equation displacement for chlorine and iodineCl2 + 2I- ---> 2cl- + I2 so colour goes from pale green to brown
Trend in reactivity group 7- Atomic radius increases - Shielding increases -Less nuclear so reactivity decreases harder to gain an electron
Disproportionationthe same element is both oxidised and reduced at the same time eg Cl2 + H20 ---> HCl0 + HCL
Benefits and risks of chlorineKills bacteria in water (B) causing cancer (R)
Testing for halogensadd silver nitrate cl- white br- cream iodine - yellow