Lab manual

# Dakota state university page 90 of 232 experiment 6

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Unformatted text preview: ions: 1. What do you expect the primary danger in this lab will be? 2. What do we need to convert from mass to moles? 3. How can we determine if the crucible is cool? Dakota State University Page 89 of 232 Experiment 5: Empirical Formula General Chemistry I and II Lab Manual Post-Lab Questions: 1. If moisture was still on the crucible before adding the hydrated salt, which was then subsequently driven off in the drying step for the salt, would your calculated molar ratio of salt to water be too high or too low? 2. If you did not drive all of the moisture out of the hydrate, would your calculated molar ratio of salt to water be too high or too low? Dakota State University Page 90 of 232 Experiment 6: Probability General Chemistry I and II Lab Manual Experiment 6: Probability Purpose: To generate a fair quantity of numbers for students to practice certain statistical tests and methods. Porpoise: A friendly aquatic animal. Background: None Introduction: There is an old joke, regarding a famous concert hall, Carnegie Hall, in which only the most talented musicians in the world are invited to play. It goes like this; “How do I get to Carnegie Hall?” “Practice, practice, practice.” And then there would be huge laughter. That’s the idea behind today’s experiment. Sure, you can practice on the homework problems, but then I would be forced to think up a real experiment. So, we’re doing this instead. You will be generating your own data for statistical analysis. The concept is to have one data set that should be completely random, one data set that should not be random but should, none the less, contain a good amount of human error, and one data set that should provide a linear relationship, but with fairly good random error as well. I would like you to perform the statistical analysis using Excel, both by putting in your own formulae (from our textbook), and from using Excel’s built in functions. I also highly encourage you to repeat these calculations using your hand- held calculator as practice for the exam, since you probably won’t have Excel available to you then. Good luck! Procedure: CAUTION! Wear safety goggles and aprons throughout the entire experiment! Unless you don’t want to. A dicey problem: You will find dice in the lab. Throw this dice 100 times, keeping track of the sum total of each throw. Return to Middle School: If a paper football does not exist, make one. On the floor, use a piece of tape to denote the “touchdown”. From the other side of the lab, slide the paper football 100 times; record the distance from “scoring” for each throw. Remember to keep track of the Dakota State University Page 91 of 232 Experiment 6: Probability General Chemistry I and II Lab Manual signs of the distances as well (“+” if each throw was too far, “-” if each throw was not far enough). Buns of Mossy Zinc: Using a balance, obtain the mass of one piece of mossy zinc. Remove the zinc, tare the balance, and obtain the mass of two pieces of mossy zinc. Continue in this fashion, increasing t...
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