Copper Vs Oxygen

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One possible source of error that could have occurred relates to the methane gas that was used to prevent the recombination of oxygen and copper. This gas was pumped into the test tube, and fed into a flame as it came out. But, as this gas was moving into and out of the test tube, it could have been taking some of the red copper oxide particles with it. Because of this loss of copper oxide, you are losing both the elements of copper and oxygen, not just the oxygen. So, this causes the mass of the copper to be decreased from what it should be as not all of the copper particles from your original amount of copper oxide are accounted for. The mass of oxygen would then receive an increase because the sum of the element’s masses need to equal

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