1. If there were air bubbles around the pennies in the water as the volume was d
ID: 982787 • Letter: 1
Question
1. If there were air bubbles around the pennies in the water as the volume was determined, would the calcu- lated composition of the penny shift to more copper or more zinc/ Explain your reasoning. 2. Suppose that one group did the penny measurements with 5 pennies and another group used 500 pennies. a. How would you expect their densities to compare? Why b. Which group would you expect to have the smallest percent error? Explain your reasoning. If Part 1 was repeated in a very hot lab, would students find that the NaCl solutions' densities increased, decreased, or remained the same? Explain your reasoning. (Assume that the experiment was done quickly enough that no significant evaporation occurred.) 3.Explanation / Answer
Solution :-
Q1) If the air bubble is present while determining the volume of the penny then this air bubble will give the higher volume of the water displaced by penny so the colume displaced by the penny would be more than actual volume of the penny so the density of the penny will be less therefore since the molar mass of Cu is less than Zn so it would give higher percentage of the Cu
Q2) if the experiment was done using the 5 pennies and 500 pennies then
a).Volume determined using the 500 pennies would be more than actual so it will give the lower density. Because the 500 pennies when they toch to each other thenthey may have small air bubbles or the contact with the container wall increases its volume and given higher volume of displaced water which will lead to the lower density than actual.
b).The group with 5 pennies will have less error because the the change in the colume will be very small with 5 pennies as compared too error associated with 500 pennies.
Q3) If the part 1 was repeated with very hot lab then volume replaced by pennie is more because the volume changes with temperature so it will lead to the lower density of the penny.
4) if we did not rinse the graduated cylinder with the next solution then it residue or traces remain in the gradulated cylinder from the previously used solution will add up to the volume of the NaCl solution so it can affect the density the mass would behigher so it can give the higher density.
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