Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chemistry - Coggle Diagram
Chemistry
2.4 Simple and giant structures
Simple structures
when atoms have strong bonds inside the molecule
but weak
intermolecular forces
easy to cut
micromolecules
covalent substances have low melting and boiling points
covalent simple structures
don't conduct electricity
no electrical charge and the atoms can't move freely because of the strong bonds
Ionic compounds do conduct electricity
because ions have electrical change and are free to move around in liquid state
e.g H20, CO2
Giant structures
3D arrangement
e.g diamond, silicon dioxide
D: each carbon atom is joined with 4 other carbon atoms
S: each silicon atom is joined with 4 oxygen atoms and each oxygen atom is surrounded by 2 silicon atoms
2D layers
e.g graphite
each carbon atom is joined with 3 other carbon atoms
they make layers, but the intermolecular forces between them are weak
most giant structures
don't conduct electricity but graphite does
because of its layers allow electricity to pass through
hexagonal rings
graphene
6:6 coordination
e.g Sodium chloride crystals
a sodium ion is surrounded by 6 chlorine ion
macromolecules
high melting and boiling points
solid at room temp
fullerene
molecules of carbon that are hollow shaped
can be ionic or covalent
5.1 Reactivity and displacement reactions
The reactivity series
some metals are more reactive than others
most reactive at the top, least reactive at the bottom
