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States and Matter and Chemical Cycles Index

States of Matter
A Chalk Cycle

The Chapters Index

 

Sulfur

The element sulfur is found in volcanic areas. It forms yellow deposits around the crater of a volcano.

 

 

THE LANGUAGE OF CHEMISTRY

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A Sulfur Cycle

In the cycle shown below there are three separate chemical reactions represented:

  • Reaction 1: Sulfur powder is heated strongly with iron filings in a test tube. After a while the contents of the tube will glow and iron II sulfide is formed.

  • Reaction 2: Once the iron II sulfide has cooled down dilute hydrochloric acid is added to it. This is done in a fume cupboard since one of the products, hydrogen sulfide gas, has a pungent odour similar to bad eggs. The hydrogen sulfide gas is collected in a gas jar.

  • Reaction 3: Oxygen gas is mixed with the hydrogen sulfide gas. A lighted match will ignite these two gases. The products of this reaction are water and powdered sulfur.

 

Sulfur Cycle

 

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