Does anyone have a good expt for a cooling curve expt ?
Maybe dripping/lard/candle wax. We are trying for an "angular" curve rather than "curvy" one ( if that makes sense )
We tried Salicylic acid but didn't get a good result.
Any ideas ??
Ta
cooling curve expt
Re: cooling curve expt
Not sure what you mean by angular exactly but you could try stearic acid. Have a look at the graph here http://www.bbc.co.uk/schools/ks3bitesiz ... es_5.shtml
Re: cooling curve expt
It will always be a curve as when cooling the temp differance to ambient gets less so heat emited is less/Slower
In industry they have an instrument called a "Tech Tip" which is a cup with a thermocouple in it, connected to a recorder producing a cooling curve of molten metal, by the shape of the curve they can say what elements make up the alloy.
In industry they have an instrument called a "Tech Tip" which is a cup with a thermocouple in it, connected to a recorder producing a cooling curve of molten metal, by the shape of the curve they can say what elements make up the alloy.
Re: cooling curve expt
paraDICHLOROBENZENE is best, 
but must be performed in fume hood.
STEARIC ACID is safest.
but must be performed in fume hood.STEARIC ACID is safest.
-
smeee
- Posts: 617
- Joined: 02 Jun 2006, 10:00
- Job Title: Lab Technician
- School: LaSalle Catholic College
- Suburb: Bankstown
- State/Location: NSW
Re: cooling curve expt
Thank you all for the tips.
This is for a university lecturer. After all the research I did, with your help, he decided to go with paraffin wax heated in a water bath so its pretty safe.
Some of these uni students haven't done science since Year 10. What chance will their students have ?
This is for a university lecturer. After all the research I did, with your help, he decided to go with paraffin wax heated in a water bath so its pretty safe.
Some of these uni students haven't done science since Year 10. What chance will their students have ?
