Formation of Calcium Carbonate Investigation 5: Limestone


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Formation of Calcium Carbonate

  • Investigation 5: Limestone

  • Earth History

  • Grade 6


Quick Write

  • In your ISN on page 74, titled “Limestone Fizz Quick Write”, please respond to the following question:

    • How do you think limestone forms? What process of sedimentation might produce a rock that fizzes with dilute acid?


Fizzing of Limestone

  • Limestone fizzes in acid because they contain calcite.

  • Calcite is one form of calcium carbonate.

  • The fizzing is CO2 (Carbon Dioxide) being releases.



Think About This…



Formation of Limestone



Where Does Calcium Carbonate Come From?

  • Calcium Carbonate forms in the sea in two main ways:



Where Does Calcium Carbonate Come From?

    • Type1:
      • Some animals use calcium to make their bones, shells, and scales.
      • The calcium in shells combines with carbon and oxygen to make CaCO3 (calcium carbonate).
      • When the animal dies, the calcium settles to the bottom and can be incorporated into the forming rock.
      • Example: Oyster shells can be a main component of limestone.


Where Does Calcium Carbonate Come From?

  • Type 2:

    • Calcium carbonate also forms when CO2 (carbon dioxide), exhaled by organisms living in the sea, reacts with calcium in the water.
    • Calcium carbonate forms right in the water and precipitates to the bottom.
    • Example: the reside at the bottom of our cups.


Calcium Carbonate Chemical Equation

  • Ca(OH)2 + CO2 CaCO3 H20




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