Covalent Structures, Carbon allotropes

Science 10

Non-metal atoms sharing electrons Can form two structures: Simple molecular structure (last class)

◦ Simple, small molecules◦ Strong intra-molecular covalent bonds◦ Weak intermolecular bonds (between molecules)◦ Low melting and boiling points

Giant covalent structure◦ Huge, 3-D structure◦ Strong intermolecular bonds lead to high melting

and boiling points

Covalent Bonding - Recap

Element, solid, non-metal

Atomic Number =6, Atomic mass=12.01 amu

Has many allotropes – different molecular forms (configurations/structures) in the same state

Can you think of some?

Carbon

Diamond Graphite Fullerenes (buckyball) Carbon nanotubes

Allotropes of Carbon

Make a table with four headings:◦ Diamond◦ Graphite◦ Buckminsterfullerne (C60)◦ Carbon nanotubes (CNT)

List all the properties you can think of. Then discuss and compare tables as a class.

Brainstorm

http://www.creative-chemistry.org.uk/molecules/carbon.htm

Molecular Models of Carbon

LifeGem – Company based in Illinois, USA

www.lifegem.com Scroll down and select the “created from

carbon” hyperlink to see the process Cool, eh?

Interesting fact – you can be a diamond!!!

O – Oxygen (O2) and Ozone (O3)

Other element allotropes

Will have different structure

Will have different chemical and physical properties (eg. Reactivity or colour)

Different potential uses in the scientific community and society

Allotropes

See handout

Work period today

MLA style info: Go through HS Library Website Online databases

Assignment