Wikipedia
Search Wikipedia:

Latest topics
» Role of Alcohol in general chemistry
Fri Dec 15, 2017 12:17 am by bejoy

» Dendrimers for drug delivery
Mon Dec 11, 2017 1:23 am by bejoy

» Catalysis and its importance in chemical industry
Thu Nov 09, 2017 5:06 am by bejoy

» Cracking: Breaking up larger molecules
Thu Nov 09, 2017 5:05 am by bejoy

» What is Alkylation?
Fri Nov 03, 2017 12:35 am by bejoy

» An Ultimate Guide on Diamond
Thu Nov 02, 2017 2:15 am by bejoy

» Chemistry Running Behind Anger
Mon Oct 30, 2017 12:31 am by bejoy

» The Discovery of Four New Elements in the Periodic Table
Wed Oct 25, 2017 1:23 am by bejoy

» Carbonic Acid: Occurrence, Preparation, Properties and Uses
Mon Oct 23, 2017 1:39 am by bejoy

December 2017
MonTueWedThuFriSatSun
    123
45678910
11121314151617
18192021222324
25262728293031

Calendar Calendar

Free Hit Counter

Burnt boiled egg in water = shiny, mirror-like appearance. Why does this happen?

View previous topic View next topic Go down

Burnt boiled egg in water = shiny, mirror-like appearance. Why does this happen?

Post  violin_chic_05 on Wed Aug 15, 2012 9:42 pm

My mom showed me this mini chemistry experiment I could use in my classroom, but I don't quite know what the chemistry is behind it. I want to be able to explain it to my students.

You carefully burn a boiled egg, over a candle or another open flame (not sure if a Bunsen burner would be too hot, I haven't tried it yet - could just make the egg crack because of the heat). I just use some regular BBQ tongs to hold it over the flame to avoid getting burned. You also want to wave the egg around, not hold it right over the flame for too long, otherwise it will crack. Naturally, it turns black. You want it completely black, not just lightly burnt. It works the best if the WHOLE egg is black (you may need to rearrange how you're holding the egg to get all parts).

You carefully place it in a glass full of water (a jar of some kind would work the best - something with a wide mouth so you can easily place the egg in. Don't drop the egg - all of the carbon around the egg will come flaking off). The egg ends up looking like a mirror, with a very shiny coating. When you remove the egg, it is still dry (where the carbon hasn't flaked off).

I know that carbon is non-polar, and water is polar, so that's why there is a sort of protective covering of air around the egg in the water, and why it's dry when you pull it out of the water. My question is, why a boiled egg? Would this work with anything else that was burnt? I don't think I've seen this effect with anything else that has been burnt and placed in water. Is there something about the proteins in the egg shell that cause this effect? It works with a raw egg, by the way. I'm guessing boiling the egg just creates less mess if the egg is dropped.


Last edited by violin_chic_05 on Wed Aug 15, 2012 9:43 pm; edited 1 time in total (Reason for editing : wrong title)

violin_chic_05

Posts : 1
Join date : 2012-08-15

View user profile

Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum