What are the transition metals?

What are many transition metals and compounds used as and give an example?

What is thermal decomposition and what happens when it occurs with transition metal carbonates?

Show the balanced symbol equation and the word equation of the thermal decomposition of copper carbonate

Metal compounds in solution contain metal ions. Some of these form precipitates (insoluble solids) that come out of solution when sodium hydroxide is added to them. What colour of precipitate di the following ions form:
Copper (11)
Iron (11)
Iron (111)