Chalk it Up
 Purpose: The purpose of this activity is to determine the number of the formula units of CaCO3 (chalk) that are deposited onto a chalk board.   Procedure:   Carefully record the mass of a piece of chalk. Write your name of the chalkboard. Reweigh the chalk.   Data: Create your own data table here.   Data Analysis:   Show a word formula and sample calculation:   Calculation the mass of chalk deposited onto the board. Convert grams of chalk CaCO3, to formula units.   Compile your data with that of 9 other classmates. Input into List 1 (L1) of the graphing calculator. Go to stat. Arrow over to calc. Select one variable. Select enter. Find the following: The mean () with the standard deviation (Sx) The range with minimums and maximums The median   Discussion:   What is chalk made of? How does it form? Why is there so much limestone in Florida? Why can you pick up a piece of white limestone off the ground and write your name with it on a sidewalk? How many formula units of CaCO3 are in one mole of CaCO3? How much does one mole of CaCO3 weigh? How many times would you have to write your name to use up 0.50 grams of chalk?

E Saylor

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