Lab # 2 Law of definite proportions

# Lab # 2 Law of definite proportions - Matthew Li CHE1111L-0...

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Matthew Li CHE1111L-0 September 19, 2011 Experiment 2: Post-Lab Questions 1. Will your weighings give a mass that is too high or too low if the crucible is still warm when you weight it? Explain why. The digital scale will produce a result that is too low because when the crucible is heated, the atoms spread out, making it weigh less. 2. Does this experiment successfully demonstrate the law of definite composition? Justify your answer. Yes, the law of definite composition is justified despite the fact that there is a different copper-to-sulfur ratio from the two trials because the copper-to-sulfur mass ratio is relatively the same, and there were many sources of error which may have led to this end result: Uncertainty in calculations, manual errors involving the amount of Sulfur used in the experiment, under heating, overheating, etc. 3. Why are you certain that the amount of copper in your crucible remains constant? According to the law of conservation of mass, the amount of copper in your crucible remains

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## This note was uploaded on 03/25/2012 for the course CHE 1111L-0 taught by Professor Taliaara during the Fall '11 term at St. Johns Duplicate.

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Lab # 2 Law of definite proportions - Matthew Li CHE1111L-0...

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