Refer to the Appendices at the back of your lab manual to review laboratory techniques, significant figures and statistical treatment of data.

Transcription

1 LABORATORY EXPERIMENT A: Volume of a Solid Cylinder PRELABORATORY ASSIGNMENT: Refer to the Appendices at the back of your lab manual to review laboratory techniques, sinificant fiures and statistical treatment of data. OBJECTIVES: To measure appropriate quantities to calculate volume To compare the precision of several pieces of laboratory equipment To perform data analysis, show how repeated measurements are used to determine precision in results. EXPERIMENTAL PROCEDURE: PART A: Volume by lenth measurements 1., 2. Use a metric ruler to measure lenth and diameter in centimeters (cm). Diameters, d Heihts, h Use Metal Cylinders, Only. 3. Chane diameter to radius usin: Use 1cm 3 = 1 to convert from cubed lenth units to volume units Use to calculate Volume PART B: Volume from Mass with Known Density 1. Use the followin instruments to measure the mass of the cylinder: Deciram, Centiram, Milliram, Analytical Balances. Deciram Balance (Ex: 51.3 ) Centiram Balance (Ex: )

2 Milliram Balance (Ex: ) Close doors on side and top. Analytical Balance (Ex: ) Use tissue or forceps to handle sample so oils from your hand are not added to the mass of the sample. Close doors on side and top. 2. Use list provided to determine density of specific metal and use correct number of sinificant fiures. Use the equation: PART C: Volume by Displacement (of D.I. H2O)

3 Record the initial volume of the raduated cylinder (Ex: 38.1 ); carefully tilt and ently slide the metal sample to the bottom of the raduated cylinder measure displaced volume of water. (Ex: 49.1 ) Calculate volume of metal sample by subtractin final and initial volumes of the raduated cylinder. (Ex: = 11.0 ) DATA ANALYSIS: Use letters, not numbers variables of usually represented with letters. For example, V for Volume, D for Density, m for mass, l, w, h for lenth, width and heiht etc. SUMMARY TABLE OF RESULTS: Use correct number of sinificant fiures, write clearly, follow the outline exactly. If a mistake is made, follow the procedure on pae v of the lab manual (for Data Analysis / Calculations) CONCLUSION: Read the Introduction section at the beinnin of this lab! SUPPLEMENTAL EXERCISES: Some of the followin relationships may be useful: If you square or cube one side of an equation, you must do the same to all parts and the other side:

4 REFERENCE MATERIALS: These are photos of some of the metal samples used in this experiment: Aluminum (Al) is very liht in mass and silver in color Brass (Cu, Zn) is old-colored and very heavy. Copper (Cu) is copper-colored, also very heavy. Sn, Zn easy to mix up with Al samples dull, malleable, lihter ask professor! Steel (Fe, C) is heavy and may be shiny steel can tarnish and become dark silver / brownish in color. Steel may have blotches of tarnished brown color. It is possible to have a lead (Pb) sample but, for this set, most of those have been removed; Lead is malleable, dull rey in color, very heavy for its size (lare density) Lead (Pb)

5 Density List for Various Laboratory Materials Acrylic Aluminum Aluminum 2.7 Brass Brass 8.0 Copper Copper 8.9 Lead (Pb) Manesium (M) Nylon 1.13 PVC Steel Steel 7.6 Tin (Sn) (ray) clear cube - opaque white cube - rey cube (white) (use white form: / ) Wood (Oak) Wood (Pine) Wood (Poplar) thin-rained cube hard - thick-rain pine smell - thick-rained cube hard Zinc