Halogens Flashcards
Trend in boiling points and why
Increase down the group because stronger van der waals forces as larger mr
trend in electronegativity and why
decreases down the group because more electron shielding so less strong attraction to the valence electrons
reactivity trend and why
less reactive down the group because halogens gain an electron when reacting and thus larger atomic radius and more electron shielding will make it harder to gain electron
oxidising power trend
less oxidising down the group
ionic equation of chlorine and bromine displacement reaction
Cl2 + 2Br- = 2Cl- + Br2
chlorine + potassium bromide colour change
colourless to orange
chrorine + potassium iodide colour change
colourless to brown solution
bromine water + potassium iodide colour change
orange to brown
F2 colour and state
pale yellow gas
chlorine colour and state
pale green gas
bromine colour and state
red/brown liquid, brown/orange gas
iodine colour and state
grey solid and purple gas
what happens when you mix chlorine and cold, dilute sodium hydroxide + equation
2NaOh + Cl2 = NaClO + NaCl + H2O
Makes bleach
disproportionation reaction as chlorine is oxidised and reduced simultaneously
chlorine + water equation
Cl2 + H2O =(reversible) HClO + HCl
chlorine + water in sunlight
2CL2 + 2H2O = 4H+ + 4Cl- + O2
