1. Carbon Changing Costumes Review Day Mar 29 & 30
Please get ready:
Your journal
Carbon Map
Homework
Please obtain:
Green Packet
File Folder

2. Chemical Formula Quiz Please set up your file folder.
When finished with your quiz…draw a diagram on the back that shows any one of the processes that we have completed so far.
Ocean Acidification
Percolation/Soil Leaching
Dissolving/Exsolving of Carbon Dioxide
Chemical Weathering
Making Limestone
Limestone Metamorphism (going from ground to atmosphere)

3. Homework: Stations 1-3 Review
Exchange your paper with a partner.
Get a skinny, color marker to use while you are grading the assignment.
Total of 17 points.

4. Station 4 Summary: Limestone Metamorphism
What happens when the heat of the Earth’s core heats up limestone?
In this activity you heated up sodium bicarbonate that represented limestone.
You weighed the mass before and after heating. You should have noticed a decrease in mass after heating. Where did the mass go? Think LoCoM!
There was an exsolution of CO₂ gas out of the tube during heating…losing mass.
You also tested the pH before and after. You should have observed a change…the product after heating was more basic. That means you changed the product…it was no longer the same thing you started with.
In deep Earth, limestone heats up and changes to calcium oxide (s) and CO₂ (g). The gas gets expelled through volcanos or geysers, the solid gets incorporated with other minerals.

5. Station 4: Limestone Metamorphism
Why was there a difference in mass? Carbon dioxide left the tube as a gas.
What is the chemical formula for Carbon at the start? NaHCO₃ (s) and CaCO₃ (s)
What Carbon is this supposed to represent in the real world? Limestone
What is the chemical formula for Carbon at the end? CO₂
What Carbon is this supposed to represent in the real world? Gas in the atmosphere from volcanos or geyers.
Where could this simulation happen in the real world? Deep in Earth’s crust
Write the balanced chemical equation for this station below:
2NaHCO₃ (s) + Heat Na₂CO₃ + H₂O + CO₂
Compared with processes in nature, this experiment represents movement of Carbon from inside the Earth to the atmosphere.

6. Let’s add this process to your map…

7. Station 5: Making Limestone Summary
How does carbon sink from surface waters to deeper waters of the ocean?
You made 2 solutions: Sodium Bicarbonate and Calcium Chloride
When you mixed the two solutions the pH changed to become more acidic, bubbles (CO₂ gas) were produced and there was a white precipitate (solid).
That solid was calcium carbonate (limestone)!
In the real world this reaction occurs in the ocean with the
many free floating ions, they react and the precipitate
(limestone) will then settle at the bottom creating a limestone
floor.

8. Station 5: Making Limestone
What is the chemical formula for Carbon at the start? NaHCO₃ (aq)
What Carbon is this supposed to represent in the real world? Ocean Water
What is the chemical formula for Carbon at the end? CaCO₃ (s) + CO₂ (g)
What Carbon is this supposed to represent in the real world? Limestone and CO₂ gas
What made Carbon change forms?
Where could this simulation happen in the real world? Oceans and Ocean floor
Write the balanced chemical equation for this station below:
Ca²⁺ + 2Cl⁻ + 2HCO₃⁻ + 2Na⁺ Na⁺ + 2Cl⁻ + CaCO₃ + H₂O + CO₂
Compared with processes in nature, this experiment represents movement of Carbon from ocean water to seafloor.

9. Let’s add this process to your map…

10. Khan Academy Carbon Cycle
Glue the questions into your notes section. Answer the questions as you watch the video.

11. Station #7
For this station you will need the text book.
Go to page 559, with your team work through all the questions on pages in your journal.
When done, draw all 3 processes on your carbon map.