oxidising agents ; Halogens

Question 1

Name the 4 Halogens

Answer 1

Fluorine
chlorine
bromine
iodine

Question 2

general properties of all Halogens

Answer 2

1. Toxic
2. reactive to water and behave as strong acids
3. aid combustion as they oxidise
4. Highly reactive, especially with alkali metals and alkaline earths
5. have low melting points and boiling points
6. The halogens become darker as you go down the group
7. The halogens become less reactive as you go down the group.
8. Halogens readily combine with hydrogen to form the hydrogen halides EG Sodium chloride

Question 3

Describe Fluorine F2

Answer 3

1. pale yellow gas
   2, reacts on contact with combustable substances by combusting EG even a house brick
2. reaction to water is vigourous. it burns water
3. bright white flame
4. pungent
   6.corrosive
   7.reacts vigourously with water combines with hydrogen to create hydrofluoric acid. burns even after neutralising with alkali
5. toxic
6. highly and most reactive halogen. reacts with every element except helium !!

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Question 4

describe Chlorine

Answer 4

• green yellow gas
• second most reactive halogen
• Much heavier than air. Pools. WW1 pooled in trenches
• Toxic WW1 gas
• reacts slowly with water and produces hydrochloric acid attacks wet mucus
• strong odour ( bleach )
• toxic
  *

Question 5

describe bromine

Answer 5

dark red liquid
toxic
corrosive
slightly soluble
reacts vigourosly with metals
pungent

Question 6

describe iodine

Answer 6

black crystals with purple gas
irritating odour
least reactive of halogens
slightly soluble in water

Question 7

use of fluorine

Answer 7

refrigerant gases

Question 8

use of chlorine

Answer 8

disinfectant bleach
salt
bleach pulp white for paper

Question 9

use of bromine

Answer 9

heat retardents in TV and laptop casing

Question 10

use iodine

Answer 10

medical disinfectant

Question 11

define oxidising agent and why are Halogens included

Answer 11

An oxidizing agent is defined as “a substance that contains oxygen and gives it up readily, plus the halogens.”

The halogens are included in the general definition of an oxidizing agent because they will support combustion. It is important to note that the halogens contain no oxygen in their molecules but are still extremely efficient oxidizing agents because they will support combustion

Question 12

define oxidising agent and why are Halogens included

Answer 12

An oxidizing agent is defined as “a substance that contains oxygen and gives it up readily, plus the halogens.”

The halogens are included in the general definition of an oxidizing agent because they will support combustion. It is important to note that the halogens contain no oxygen in their molecules but are still extremely efficient oxidizing agents because they will support combustion

Question 13

What are the Halogens

Answer 13

The group 7 elements are also known as the halogens. They include fluorine, chlorine, bromine and iodine, which all have seven electrons in their outer shell.

Question 14

what are the chemical symbols for the Halogens

Answer 14

Fluorine, F
Chlorine, Cl
Bromine, Br
Iodine, I