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# Lab Report

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## José Armando Miranda

on 20 September 2012

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#### Transcript of Lab Report

Instituto Cristiano Bilingüe Sunshine Grade: 10th Jose A. Miranda Lab Report ''Significant Digits in Measurements'' Chemistry Class September 19th, 2012 Mr. Jose Popoff Introduction Significant Digits in Measurements No measured quantity can ever be exact; there will always be some uncertainty associated with it. The degree of certainty in a measurement is reflected in the number of significant digits contained in it. The significant digits in a measurement contain all the certain digits-those of which we can be sure-and one uncertain digit. In this report I will talk about how my team and I performed several things to learn about significant digits in measurements. I will also talk about how we measured several coins of different years but of same size and value. We measured thickness, lenght, width and the mass of the coins. Finally we measured the volume of a test tube into a beaker. Objectives The objectives of this lab activity were the followings: Learn about uncertainties in measurement. Express measurements using the proper number of significant digits. Use significant digits properly in calculations. Become familiar with common laboratory measuring instruments for length, mass, and volume. The materials we used were the followings: Materials Balance Calculator Graduated cylinder of 100 mL Metric plastic ruler Coins Test tube 1) We measured the thickness of a Honduran coin of 10 cents, we laid the ruler over the edge of the coin that we were holding in our fingers. We measured the coin in centimeters and millimeters or tenth of a centimeter.
NOTE: Each of our group member measured the coins by themselves. Procedure 2) We repeated step one but with 4, 7 and 10 coins. We observed while measuring the coins that the thickness of the coins changed. 3) We carefully measured the length and width of our chemistry book in units of centimeters.
NOTE: Each member did this step by themselves and at their houses. 4) We individually find the masses of 5 of our coins. For this step we used coins from different years, some newer and some older.