Halogens

Question 1

Oxidising agents: what colour does (Cl) turn when reacted with: Chloride, Bromide and Iodide (AQueous and OrGanic)

Answer 1

Cl turns…
Br-: Yellow(AQ) & Orange(OG)
I-: Brown(AQ) & Purple (OG)
Cl-: NO REACTION

Question 2

Oxidising agents: what colour does (Br) turn when reacted with: Chloride, Bromide and Iodide (AQueous and OrGanic)

Answer 2

Br turns…
I-: Brown(AQ) & Purple(OG
Cl- and Br-: NO REACTION

Question 3

Oxidising agents: what colour does (I) turn when reacted with: Chloride, Bromide and Iodide (AQueous and OrGanic)

Answer 3

NO REACTION/VISIBLE CHANGE FOR ANY

Question 4

What is an Oxidising Agent?

Answer 4

Electron acceptor that gains electrons (gets reduced after oxidising another element)

Question 5

Trends DOWN Group 7
Reactivity:
Electronegativity:
Boiling Point:
Atomic Size:
Oxidising power:

Answer 5

Trends DOWN Group 7
Electronegativity: INCREASES (weaker attraction between nucleus and the electrons)
Reactivity: DECREASES (more shielding because of larger size = less ability to attract another electron)
Boiling Point: INCREASES (more electrons = more London forces that must be broken
Atomic Size: INCREASES
Oxidising power: DECREASES (lower reactivity down the group)

Question 6

Halide identification: Ionic equation of silver nitrate and a halogen/halode

Answer 6

Ag+(aq) + X-(aq) -> AgX

Question 7

Halide identification: What ppt does AgF form?

Answer 7

NONE, AgF is SOLUBLE

Question 8

Halide identification: What colour ppt does AgCl form and Which concentration of Ammonia does it dissolve in

Answer 8

AgCl forms a WHITE ppt and dissolves in DILUTE Ammonia (NH3)

Question 9

Halide identification: What colour ppt does AgBr form and Which concentration of Ammonia does it dissolve in

Answer 9

AgBr forms a CREAM ppt, is sparingly soluble in Dilute Ammonia and Is completely soluble in CONCENTRATED Ammonia

Question 10

Halide identification: What colour ppt does AgI form and Which concentration of Ammonia does it dissolve in

Answer 10

AgI forms a YELLOW ppt and is INSOLUBLE

Question 11

Halide identification: Why is the Silver Nitrate solution acidified and why is HCl NOT used

Answer 11

In order to remove Hydroxide and Carbonate ions, which could form a ppt with silver ions, interfering with the test. HCl is not used due to the Cl- ions potentially messing with the test

Question 12

Uses of Chlorine: What is Disproportion

Answer 12

Oxidation and reduction of the SAME ELEMENT