Chemistry AQA AS Unit 2 Group 7

Made these notes for my year 12 summer exam to revise and read over. There are spelling mistakes in most of my files but due to the busy exam schedule I had no time to correct them (sorry).

Most files have more information than what is needed but I feel it helps you feel more confident walking into the exam if you have a greater knowledge background and may help when having to apply knowledge to questions. Good luck :)

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  • Created by: Chelcie
  • Created on: 02-09-13 13:34
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Group 7, the Halogens
PHYSICAL PROPERTIES
Fl ­ pale yellow gas
Cl ­ greenish gas
Br ­ red brown liquid
I ­ black solid

`Swimming bath smell'

F ­ F bond is weak as the small size of the atom leads to repulsion between the non bonding
electrons.

SIZE OF…

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Potassium Chloride Potassium Bromide Potassium Iodide (aq)
(aq) (aq)
Chlorine Water N/A Brown colour Dark brown
Bromine Water No reaction N/A Dark brown
Iodine Solution No reaction No reaction N/A

HALIDE IONS AS REDUCING AGENTS
Halide ions give away/lose es and become halogen molecules.
Increases reducing power down the group…

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IDENTIFYING METAL HALIDES WITH SILVER IONS
Before testing for halide ions you have to remove carbonate and hydroxide impurities as
silver carbonate and silver hydroxide are both insoluble precipitates.
Therefore nitric acid is added first to remove them as you convert them into soluble things.

1 CO2 (aq) + 2HNO…

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