A colour change might take place when two substances react. It can also happen when a compound is broken down by heating it. This is called thermal decomposition. Watch this video to see how the ...

The reaction of zinc metal with iodine shows direct combination, decomposition, recrystallization of sublimed I2, and electrolysis.

Thermal decomposition is a chemical reaction that happens when a ... You can see a colour change from green to black during the reaction. The carbon dioxide produced can be detected using ...