C(s) + O 2 (g) → CO 2 (g) Step 2 – More coke is ... too much energy if it was started and stopped regularly. The calcium oxide then reacts with silica (sand) impurities in the haematite ...

For example: copper carbonate decomposes on heating to make solid copper oxide, which stays in the boiling tube, and carbon dioxide gas, which escapes magnesium reacts with oxygen, gained from the ...