1. Select a kit containing six rubber stoppers, three small and three large. Do not mix your kit with stoppers from other kits.

2. Determine the mass of 1 small stopper in three different units (e.g. grams, ounces, teals). Determine the mass of 1 large stopper in the same three units (e.g. grams, ounces, teals).

3. Determine the mass of 2 and then 3 small stoppers in grams. Determine the mass of 2 and then 3 large stoppers in grams.

4. Fill the data into the data table below:

5. Is there some generalization you can make about the masses of the small and large stoppers in each row, for example, some ratio which is virtually the same for each row? (If yes, continue, if no, return to 5.)

6. What is that generalization?

7. A small finishing nail weighs 13 g while a large one weighs 37 g. I have 10 pounds of small nails. I would like to weigh out the same number of large nails without having to count them. What mass of large nails should I weigh? (1 lb = 454 g on earth near sea level, where we are.)

8. 13 tons of small nails contain the same number of nails as how many tons of large nails? Explain.

9. Now solve the problem in 8 without making any unit conversions. If you understand the generalization you wrote in 6, you will see that no conversions were really necessary. Be sure to explain your solution.

10. Shortly, you will receive the mole lecture, based upon the “Mole Lecture Notes”. Finish writing this lab after the lecture and explain, in your conclusions, what your answer to 6 has to do with the concepts in the mole lecture?

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