Physical Change vs Chemical Change

Moderators: Chem_Mod, Chem_Admin

Arjun Sharma 1D
Posts: 33
Joined: Fri Sep 29, 2017 7:06 am

Physical Change vs Chemical Change

Postby Arjun Sharma 1D » Sat Jan 13, 2018 3:34 pm

Is the conversion of graphite to diamond a physical change or a chemical change?

jillian1k
Posts: 54
Joined: Sat Jul 22, 2017 3:00 am

Re: Physical Change vs Chemical Change

Postby jillian1k » Sat Jan 13, 2018 3:50 pm

It's a chemical change because there is a change in bonding that changes the identity/chemical composition of the substance. In graphite, each carbon atom is bonded to 3 other carbon atoms with one lone electron pair. Whereas in diamond, each carbon atom is bonded to the most number of carbons possible (4) with no lone electron pairs. This results in stronger, more stable bonds in diamond than in graphite.

Physical changes of substances just change the form (ie phase changes), but not the chemical composition of the substance.
Last edited by jillian1k on Sat Jan 13, 2018 3:58 pm, edited 1 time in total.

Shanmitha Arun 1L
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 1 time

Re: Physical Change vs Chemical Change

Postby Shanmitha Arun 1L » Sat Jan 13, 2018 3:56 pm

Graphite and diamond are both large molecules made of carbon, but have different connectivity. The carbon in graphite are bonded to 3 other carbon neighbors, but in diamond carbon bonds with 4 neighbors. Therefore, it would be a chemical change.


Return to “Phase Changes & Related Calculations”

Who is online

Users browsing this forum: No registered users and 2 guests