what happens when sulphur is heated in absence of air?

Answer 1

If heated enough, it would melt at about 388 K and boil at about 718 K. (that's 115 C and 445 C, respectively.)

Answer 2

Doing this from memory: There is no need to do heat sulfur in the absence of air; just heating S8 in a regular test tube with a Bunsen burner works. The yellow crystals of S8 melt just above 100 °C depending on how rapidly it is heated to give a mobile yellow liquid that can be poured easily out of the tube. At >~160 °C all heck breaks lose and the liquid becomes a deeper and deeper red as the T rises and the viscosity increases until at ~200 °C it becomes as thick as treacle (and looks like treacle!) and you can turn the tube upside down and the brown-red liquid hardly flows at all. What happens is that a S-S bond in the S8 ring breaks to give a .S-[S6]-S. diradical and triggers a radical chain reaction: .S-[S6]-S. + nS8 → .S-[S6](n+1)-S. where n can be >200,000 (i.e., long chains of S atoms). Further heating >200 °C the chain length drops and the liquid S becomes more fluid but never completely mobile. If you pour the molten S at this T into water you get plastic S (but that is another story). S boils at 444 °C (easy to remember) where you now need to study in absence of O2. In the vapor phase there are S(n) species with n 2-8. As the T increases you get more S2 that is the analogue of O2. Confirm what I've stated by reading up about it in either F. A. Cotton, G. Wilkinson, et al, Advanced Inorganic Chemistry 6th ed (1999) or N. N. Greenwood, A. Earnshaw, Chemistry of the Elements 2nd ed. (1997) under sulfur of course. cheers

Answer 3

First the Sulphur will melt to a liquid at 239°F (115°C) and, on further heating, it will boil and vaporise to a gas at 833°F (445°C).
(I note your spelling of Sulphur).

Answer 4

Changes into lower allotropes and finally melys (assuming no air condition is ment).

Answer 5

it would melt due to heat decomposition, and if the gas created was allowed to mix with air it would form sulphur trioxide and hydrogen sulphide. and smell like rotten eggs bad.

Answer 6

It melts. Different things happen for different allotropes.

Answer 7

It would melt if you heated it to about 115C

Answer 8

Not much of anything will happen. Oxygen is needed for any type of reaction.

Answer 9

if you heat sulphur in abscence of air, air can get upset because you didn't waited for him.