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.
- Carefully record the mass of a piece of chalk.
- Write your name of the chalkboard.
- Reweigh the chalk.
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
- 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?