January 18, 2021, 01:59:24 AM
Forum Rules: Read This Before Posting


Topic: Chemical and physical reaction  (Read 253 times)

0 Members and 1 Guest are viewing this topic.

Offline Bobixtt

  • Very New Member
  • *
  • Posts: 1
  • Mole Snacks: +0/-0
Chemical and physical reaction
« on: January 08, 2021, 06:31:26 AM »
Hi everyone!
I'm writing two reports and I got doubt, I know it may sound stupid, but my colleague confused me and I need clarification  :)

The two reactions I'm analyzing are:
1) dehydration of sugar with sulfuric acid
2) Reactions of lithium with air

In my opinion they are both chemical transformations, not just physical, in fact the first one is an elimination reaction and a second one is a combustion. Am I wrong? Thank you all for your help

Offline Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Posts: 26237
  • Mole Snacks: +1706/-402
  • Gender: Male
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Chemical and physical reaction
« Reply #1 on: January 08, 2021, 07:09:22 AM »
In my opinion they are both chemical transformations, not just physical, in fact the first one is an elimination reaction and a second one is a combustion.

Sounds OK to me.
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7853
  • Mole Snacks: +545/-92
  • Gender: Male
Re: Chemical and physical reaction
« Reply #2 on: January 08, 2021, 08:50:01 AM »
Lithium reacts with both oxygen and nitrogen in the air.
AWK

Offline umut

  • New Member
  • **
  • Posts: 4
  • Mole Snacks: +0/-0
Re: Chemical and physical reaction
« Reply #3 on: January 12, 2021, 05:18:04 AM »
2) Reactions of lithium with air

When lithium reacts with air, only combustion does not occur. We can talk about 2 reactions:
4Li + O2 → 2Li2O ( combustion reaction )
6Li +N2 → 2Li3N2 ( Synthesis reaction )

The rest of the post, you are right :)

Sponsored Links