Author Topic: CHEMISTRY GUIDE-A guide to special conditions needed for various reactions  (Read 9630 times)

Offline Got Tech? GO TECH

  • Newbie
  • *
  • Posts: 45
  • Reputation: 205
yooo help appreciated man :D

No problem!

Offline J.Darren

  • SF Geek
  • ****
  • Posts: 405
  • Reputation: 956
  • Gender: Male
In oxidation of alcohol to alkanoic acid, the potassium dichromate oxidising agent needs to be ... heated or hot.
Do not go where the path may lead. Go instead where there is no path and leave a trail.

Offline Ivo

  • SF Geek
  • ****
  • Posts: 515
  • Reputation: 2767
In oxidation of alcohol to alkanoic acid, the potassium dichromate oxidising agent needs to be ... heated or hot.

When making ethanoic acid from ethanol, you heat the mixture of ethanol, potassium manganate(VII) and sulphuric acid.
Always willing to help!  8)
"In helping others, we shall help ourselves, for whatever good we give out completes the circle and comes back to us."

Offline Got Tech? GO TECH

  • Newbie
  • *
  • Posts: 45
  • Reputation: 205
In oxidation of alcohol to alkanoic acid, the potassium dichromate oxidising agent needs to be ... heated or hot.

Yeah forgot about that, sorry I left it out, I'll edit it at once.

Offline Got Tech? GO TECH

  • Newbie
  • *
  • Posts: 45
  • Reputation: 205
In fact, you need 2 ATM for sulphur dioxide--> sulphur trioxide...just saw it in w09 q6. they state that you need 450 C and 2 Atmospheres pressure.

elemis

  • Guest
In fact, you need 2 ATM for sulphur dioxide--> sulphur trioxide...just saw it in w09 q6. they state that you need 450 C and 2 Atmospheres pressure.

1-2 atm is fine.

Offline J.Darren

  • SF Geek
  • ****
  • Posts: 405
  • Reputation: 956
  • Gender: Male
Fermentation :

Glucose -> Ethanol + Carbon dioxide

Catalyst - Enzymes from yeast.
35 centigrade - if too low the rate would be too slow, if too high the enzymes will be denatured.
When concentration of ethanol reaches about 14%, fermentation ceases becuase all the glucose has been used up / yeast dies at this concentration - ethanol is poisonous to yeast.
Carried out in absence of air as fermentation is an anaerobic respiration of yeast cells.

Acid hydrolysis of complex hydrocarbons :

Heated with dilute hydrochloric acid.
The acid is the catalyst.

Starch + water -> Glucose

Hydrolysis of proteins :

Protein + water -> Amino acids

Boiled with hydrochloric acid.
Do not go where the path may lead. Go instead where there is no path and leave a trail.