Burner Ring
What happens when you burn copper turnings?
it was for a chemistry lab and what we had to do was weight it before and after. before it weighed .54 grams and then the bell rang so we had to stop heating it and heat heat it more the next day (using bunsen burners) the next day after we heated it it turned sort of silvery purple. we weighed it and it weighed more(.58g). why did it weigh more after we burnt it? i thought it would have weighed less. did we do the lab wrong because of having to continue heating later or why did it weigh more?
Nope, you did it correctly. Some of the copper was oxidized to copper oxide. There are 2 copper oxides:
* Copper(I) oxide (cuprous oxide, Cu2O), a red powder.
* Copper(II) oxide (cupric oxide, CuO), a black powder.
Heating in a bunsen flame produces a black coating of cupric oxide.
CuO weighs more per mole than Cu, so your sample gained weight.
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