Date Namt CHEH 1111 Section Pre-lab Questions: Mass, Volume and Density of Old v
ID: 715906 • Letter: D
Question
Date Namt CHEH 1111 Section Pre-lab Questions: Mass, Volume and Density of Old versus New Pennies 1. Calculate the density of a penny given that the mass is 2.546g and the volume is 0.27 mL. Show your work with the correct units and number of significant figures What is the precision of the electronic balance provided to you in the laboratory? Outline the procedure to weigh 0.526 g of copper metal. 2. 3. In what year did the U.S. Mint change the composition of the Lincoln penny? Why does this matter when obtaining the mass of a penny for this experiment? 4. What is a "meniscus"?Explanation / Answer
Density=2.546÷.27=9.42962962962 . 10 significant figures. 9.430 has 4 significant figures. 2). First major change in composition in Lincoln coin 1943. Zinc coated steel 1982 2nd change tin removed
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