Group 7 Flashcards
What is observed when dilute ammonia (NH3) is added to AgBr
cream precipitate remains
Name products of reaction of Br2 (aq) + 2NaCl (aq)
Br2 + 2NaCl
no reaction
as bromine cannot displace chlorine as chlorine is higher up in group 7
define an oxidising agent
electron acceptor
Give half equation for oxidation for bromide ions
2Br^- -> Br2 + 2e^-
State observation for this reaction
Cl2 (aq) + 2NaI(aq) -> I2 (aq) + 2NaCl (aq)
Brown solution I2 is formed
why is chlorine added to drinking water
to kill bacteria
what is observed in this reaction
Ag^+ (aq) + I^- (aq) -> AgI (aq)
yellow precipitate
What is the observation when sulfur is formed in a redox reaction in a reaction using sulfuric acid
Yellow solid
What is the test for halide ions
Acidified silver nitrate (AgNO3)
What is observed when dilute ammonia (NH3) is added to AgCl
White precipitate dissolves
Name products of reaction of I2 (aq) + 2NaCl (aq)
No reaction as brown solution remains
State observation for reaction Cl2 (aq) + 2NaBr (aq) -> Br2 (aq) + 2NaCl (aq)
Orange / brown solution is formed (Br2 is formed)
What is the observation when SO2 is formed in a reaction using sulfuric acid
acidic gas
chlorine is toxic. Why is it not dangerous to add it to drinking water
It is added in low concentations
Give products of reaction of Cl2 (g) + 2NaOH (aq)
NaCl (aq) + NaClO (aq) + H2O (l)