A “thermal decomposition” reaction occurs when a compound breaks down (“decomposition”) through the action of heat.
Perform a thermal decomposition reaction on each of these compounds and state:
The colour changes you observed
The reaction that happened
Sulphuric acid has many important uses – car batteries, detergents, fertilisers etc.
How sulphuric acid is made:
Step 1: Burn sulphur in air:
Step 2: Pass the sulphur dioxide over a vanadium oxide catalyst at 450OC:
Step 3: Dissolve the sulphur trioxide in sulphuric acid:
Step 4: Add water to the oleum:
Step 2 in the manufacture of sulphuric acid is an example of a reversible reaction:
What would happen if the temperature was decreased?
Solution – use 450OC as a compromise
The reaction would favour the production of sulphur trioxide BUT the reaction would happen at a slower rate.