Imagine you want to investigate the ideas of Priestley and Lavoisier. Assume you have been given th

The first part of the question has been cut off, here it is in full: Imagine you want to investigate the ideas of Priestley and Lavoisier. Assume you have been given three pieces of different metals. In a laboratory, metals are heated to high temperatures in crucibles.

what is the answers to point b) one factor you would change as you carry out the investigation?

I've just got this question on a test paper I've been given for homework, and I find it nonsensical. I can't think of a way in which you could conduct the test and record results that would be evidential toward's Lavoisier's theory. What results of oxidising metals would prove that "when metals burn in air, they gain something from the air and a powder is formed" as was stated in a part preceding the question. The evidence that supports Lavoisier's idea isn't wholly related to the experiment delineated by the question. Moreover, How would one prove that the metal has bonded with oxygen particles from the air and formed a powder, instead of the air displacing particles from the metal and forming a powder, in this example? I considered taking into account that you could quantify the results, such as the amount of metal oxidised within a fixed amount of time, but that does not aid in justifying Lavoisier's hypothesis in the question. Could anyone please clear these issues up for me? All I want to know is what the question wants to know.

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I just got this question for science homework and I have a test coming up in a week and it will probably appear and I'm scared because it's worth 4 marks. Anyway, I know this is a place to put your answers but I don't know. I don't get how I'm supposed to know if a metal has gained or lost something to the air by heating it up. I don't know hat to do :(