Chalk Lab PDF

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Compounds of Chalk Lab Introduction: Chalk is a compound called calcium carbonate (CaCO3) and is composed of of Calcium, Carbon, and Oxygen in a fixed ionic compound ratio. You will need to use your periodic table to determine the molecular mass of Calcium Carbonate to use in our calculations for today’s lab. Procedure: 1. You will mass your calcium carbonate and record your data in the New stick data table. 2. Calculate the amount of Formula Units of calcium carbonate in your chalk stick and then record in your New stick data table. 3. Calculate the total number of atoms in your stick of calcium carbonate and record in your New stick data table. 4. Calculate the total number of each individual atoms (Ca, C, and O) in your stick of chalk and record in your New stick data table. 5. Outside you will draw a quick picture (appropriate) or write an inspiring statement on the sidewalk. You will have 5 minutes to complete this task. 6. You will mass your calcium carbonate stick upon entering the room and record your data in the Used stick data table. 7. You will repeat steps 2-4 for used chalk and record in your Used stick data table.

Data Table: New stick Compound /Element CaCO3 Ca C O Used stick Compound /Element CaCO3 Ca C O

Mass (g)

Formula Units

Atoms

28.10g 11.25g 3.372g 13.48g

1.691x1023 FU 1.690x1023 FU 1.691x1023 FU 5.074x1023 FU

8.453x1023 atoms 1.690x1023 atoms 1.691x1023 atoms 5.074x1023 atoms

Mass (g)

Formula Units

Atoms

26.31g 10.54g 3.157g 12.62g

1.583x1023 FU 1.584x1023 FU 1.583x1023 FU 4.750x1023 FU

7.915x1023 atoms 1.584x1023 atoms 1.583x1023 atoms 1.425x1024 atoms

Questions: 1. Calculate how many formula units of calcium carbonate were placed on the ground. 1.080x1023 FU CaCO3 on the ground 2. Calculate how many total atoms were placed on the ground. Then determine the number of atoms of each of the following elements that were placed on the ground: Ca, C, and O. CaCO3: 5.380x1022 atoms CaCO3 on ground Ca: 1.060x1022 atoms Ca on ground C: 1.080x1022 atoms C on ground

O: 9.700x1022 atoms O on ground 3. Is there a possible source of error in the amounts that were calculated from the original chalk stick to the numbers placed on the ground? If yes, then explain where this error originates from and what could be done to prevent it next time. I do not think there is a source of error in the amounts that were calculated. Conclusion: Knowledge- I came into this lab with the knowledge of how to find the mass, formula units, and atoms of compounds and elements. I also knew how to mass something using a balance. Last, I knew how to calculate the amount of CaCO3 that was placed on the ground. Comprehension- What happened in this lab was we measured the compounds and elements of chalk and how much we put on the ground. First, we read the directions and got a piece of chalk and a balance. Then, we massed the grams of CaCO3 also known as the chalk and recorded the mass of it in our charts. Next, we found the formula units and atoms in CaCO3 and put the information into the table. After this we found the grams, formula units, and atoms of calcium, carbon, and oxygen in CaCO3 and recorded it. Then, we went outside and drew in the parking lot for five minutes. After, we came back in and used the balance to measure the CaCO3 again to find out how much was used and put it in the table. Then, we found the formula units and atoms of CaCO3 and put it in the table. Last, we found the grams, formula units, and atoms of calcium, carbon, oxygen in CaCO3 and recorded the information. Application-

Analysis- My findings from this lab were that I used 1.080x1023 FU of CaCO3 of the chalk. I also found out that CaCO3 consists of mostly oxygen. Last, I found out that the least amount of element in CaCO3 is carbon. Synthesis- A way that I would change this lab is I would have less calculations. The calculations of this lab took a really long time. I feel that we can still get the information we need from this lab but with less calculations. Evaluation- This lab provides meaning to me and my life because I will have to take another chemistry class in the future, and this will help me understand it better. Also, this lab provides meaning to me because I used to play with chalk all the time when I was little. Last, this lab allowed me to better understand stoichiometry....