Theoretically, if you start with 0.325 g of copper, after the second lab day you should recover ________ grams of copper.

22 Mark for Review A sample of a certain alloy has a total mass of 50.0 grams and is 50.0% silicon by mass. The sample was created by combining two pieces of different alloys. The first piece was 30.0% silicon by mass and the second piece was 80.0% silicon by mass. What was the mass, in grams, of the silicon in the second piece? A 9.0 B 16.0 20.0 30.0 ARC

Imole 1,5g Cu 504,3 X Imole ('u 5 0415H20 = Moles of anhydride used. (Show calculations) = Cu Soy • 5H20(s) A ('u 504 (5) + 5H20 (9) Hydrate » anhydride Moles of H₂O of hydration (Show calculations)= Ratio of moles of water to moles of anhydride (Show calculations.) = Molarmass = (to correct sig. figs. - do not round yet) Based on your data, what is the empirical formula of your hydrate (round your ratio to the closest whole number)? Use the Argumentation Framework (see inside front cover) (Claim- Evidence- Justification) to justify your answer. 147 S 112 52

Taking logarithms and antilogarithms is necessary to solve many chemistry problems. For practice, complete the following table, where N is a number. N ln N log N 0.603 ____ _____ _____ 1.484 _____ _____ ______ 1.336