FC11 Flashcards
Describe the attraction in metallic bonding
Attraction between the negatively charged delocalised e’s and adjacent positive metal ion
What shape does metallic substances have
Giant metallic lattice structure
What does the strength of metallic bonding depend on
The number of delocalised e’ per atom and the charge of the metal ions
Why do metallic bonding have high mpt and bpt
They have a sea of electrons bonding in all directions which needs high energy to break bonds
Why is metallic bonding soluble
In solution the ions are able to have intermolecular forces with H20 molecules
Define mobile charge carriers
Electrons that carry charge that can conduct electricity
Define substances with simple molecular structures
All covalent substances except those with giant covalent lattice structures
What happens when we heat substances with simple molecular substances
We break intermolecular forces and separate molecules. We do not break the stringer covalent bonds
Name the substances with giant covalent lattice structures
Diamond, graphite, graphene
Silicon, silica
Boron
What happened when substances with giant covalent lattice structures melt or vaporise
The covalent bonds are broken for the particles to separate so these substances have very hight mpt and bpt as a lot of energy needed to break many strong covalent bonds
Why do giant ionic compounds have very high mpt and bpt
A lot of energy needed to break many string ionic bonds to separate the ions
Why can giant ionic structures not conduct electricity as solids
As there are no mobile charge carriers to carry the current
Why can giant ionic structures conduct electricity when molten or dissolved in aqueous solution
As the ions are mobile but there are no mobile e’s
Rank the most of structure and bonding
Giant covalent
Ionic
Metallic
Simple
