LAB1

LAB1 - INTRODUCTION: The experiment is to see if one can...

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The experiment is to see if one can calculate very small values like atomic and molecular size that are in different phases (gas, liquid, and solid) using practical methods. It is extremely difficult to even attempt to measure one single atom. However, if the molar mass is known estimating the atomic size through practical measuring techniques with very small experimental error can be quite simple. This experiment will consist of measuring a block of a solid element, measuring the volume of lead pellets in a container, measuring the amount of carbon dioxide gas in a balloon, and even finding the thickness of a molecule by dropping oleic acid into a Petri dish filled with water. These are relatively doable experiments and can produce surprisingly close values to the measurement of extremely small entities such as atomic size and the amount of molecules in 1 mole. SUMMARY OF PROCEDURES: 1. Found the mass of 2 cylinders of Aluminum and Copper separately on an electric scale. 2. Measured volume of both metals separately by adding 10.0 ml of water into a 25 ml graduated cylinder that had a cylinder of each metal. 3. Found density of each metal and recorded data in Table 2. 4. Filled 10 ml graduated cylinder with 10 ml of lead shots. Using a buret, measured how much water it took to fill the cylinder up to the top of the lead shots. 5. Found the packing coefficient by pouring out the water and finding the empty space in between the lead shots. 6. Weighed and cleaned a 50 ml graduated cylinder. 7. Added 15 ml of water and weighed the graduated cylinder again. 8. Measured the length and diameter of dry ice carefully using a ruler. 9. Measured the mass on the electric scale. 10. Placed the dry ice into a flask and covered the opening with a deflated balloon. 11. After waiting about 30 minutes we measured the circumference of the balloon to figure out the volume of the balloon. 12. Cleaned a Petri dish with ethanol and rinsed it for 1 minute with tap water. 13. Measured the volume of 1 drop of diluted oleic acid by measuring how many drops are in 1 ml. 14. Filled the clean Petri dish ¾ with tap water. Then dusted the surface of water lightly with lycopodium powder. 15. Using the pipette placed one drop of diluted oleic acid in the center of the Petri dish. 16. Measured the diameter of the oleic acid 10 times for accurate results.
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This note was uploaded on 05/18/2008 for the course CH 101 taught by Professor M during the Spring '08 term at BU.

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LAB1 - INTRODUCTION: The experiment is to see if one can...

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