Group 7 - The Halogens (2) Flashcards
As the molecules get larger towards the bottom of the group, the melting and boiling points _________
Increase
The name halogen means salt producing. When they react with metals, these elements produce a wide range of salts such as:
Flouride Sodium Chloride Silver bromide Potassium iodide
The halogens are non-metallic elements with _____________ molecules: F₂, Cl₂
Diatomic
True or false: flourine and chlorine are gases
True
Is bromine a solid, liquid or a gas
Liquid
Is iodine a solid, liquid or gas
Solid
What colour is flourine
Yellow
What colour is chlorine
Green (in small quantities it’s fairly yellowish green)
What colour is liquid bromine and its vapour
Dark red liquid - red/brown vapour
Are halogens metals
No
What colour is solid iodine and its vapour
Dark grey - purple vapour
When the halogens are solid (eg. _________ at room temperature) their crystals will be brittle
Iodine
Is bromine corrosive
Yes
The higher up group 7 an element is, the _________ reactive it is. Why?
More because the shell with missing electron is nearer to the nucleus, so the pull from the positive nucleus is greater
Halogens can combine with hydrogen to form hydrogen halides E.g …
Hydrogen chloride
Hydrogen bromide
Hydrogen chloride has the formula HCl and is a _______ at room temperature
Gas
More reactive halogens will ____________ less reactive ones
Displace
Will there be a reaction and if so what will be formed when: Potassium chloride reacts with Chlorine water
No reaction
Will there be a reaction and if so what will be formed when: Potassium chloride reacts with Bromine water
No reaction
Will there be a reaction and if so what will be formed when: Potassium chloride reacts with Iodine water
No reaction
Will there be a reaction and if so what will be formed when: Potassium bromide reacts with Chlorine water
Bromine water Orange solution (Br₂) formed
Will there be a reaction and if so what will be formed when: Potassium bromide reacts with Bromine water
No reaction
Will there be a reaction and if so what will be formed when: Potassium bromide reacts with Iodine water
No reaction
Will there be a reaction and if so what will be formed when: Potassium iodide reacts with chlorine water
Iodine water Brown solution (I₂) formed
Will there be a reaction and if so what will be formed when: Potassium iodide reacts with bromine water
Iodine water Brown solution (I₂) formed
Will there be a reaction and if so what will be formed when: Potassium iodide reacts with iodine water
No reaction
What is a displacement reaction
When a more reactive element ‘pushes out’ a less reactive element from a compound
In a halogen displacement reaction - all of the compounds are ____________ (solid, liquid, gas or aqueous?)
Aqueous
What colour is chlorine water
Colourless
What colour is bromine water
Orange
What colour is iodine water
Brown
Hydrogen chloride dissociates in water but not in __________________
Methylbenzene
When hydrogen chlorine is dissolved in water the HCI molecules split up into _____ ions and _____ ions - this process it called _______________.
The solution that is formed is called __________________ acid which is an ___________ solution because it contains _______ ions
H+ Cl- Dissociation Hydrochloric Acidic H+
Halogen displacement reactions involve transfer of ______________
Electrons
