macromolecular Watch

Auni shah
Badges: 0
Rep:
?
#1
Report Thread starter 3 years ago
#1
what is the differences in the physical properties of SiO2 and SiO4?
0
reply
Rather_Cynical
Badges: 11
Rep:
?
#2
Report 3 years ago
#2
Silicon's in the same group as Carbon, so it has 4 outermost electrons.

If it's attached to 4 oxygen atoms, then it becomes a tetrahedral shape. That type of configuration can't make anything but simple molecular, which has physical properties of low melting/boiling points because it relies on intermolecular forces which are weaker than covalent/ionic bonds thus requiring less thermal energy to break for a change of state.

If it's attached to 2 oxygen atoms, then it can be arranged in a giant molecular shape, which has physical properties of very high melting/boiling points because it relies on many covalent bonds which are stronger than intermolecular forces thus requiring more thermal energy to break for a change of state.

CO2 prefers to form simple molecular because the C=O bonds are too strong, in case you're wondering about the exception. Silica also happens to be a semi-conductor, but I'm less familiar with explaining it in a bonding/structure way.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Bournemouth University
    Clearing Open Day Undergraduate
    Wed, 31 Jul '19
  • Staffordshire University
    Postgraduate open event - Stoke-on-Trent campus Postgraduate
    Wed, 7 Aug '19
  • University of Derby
    Foundation Open Event Further education
    Wed, 7 Aug '19

What are your favourite crisps?

Kettle Chips (38)
15.97%
McCoys Salt and Vinegar (17)
7.14%
McCoys Flame Grilled Steak (17)
7.14%
Walkers Prawn Cockail (26)
10.92%
Monster Munch (18)
7.56%
Pringles (62)
26.05%
Walkers Oven Baked Crisps (14)
5.88%
Walkers Beef and Onion (3)
1.26%
Thai Sweet Chili Sensations (43)
18.07%

Watched Threads

View All