Chalk / Calcium carbonate (CaCO3) - The Electric Brewery
Lab-Grade Calcium Carbonate, Natural Chalk, 500g - The Curated Chemical Collection: Amazon.com: Industrial & Scientific
Environmental Non-Toxic Dust Free White and Colored Calcium Carbonate Chalk - China White and Colour Chalk, Chalk | Made-in-China.com
Chalk - Calcium Carbonate – earthues
Chalk contains 10% calcium,3% carbon,12% oxygen and the remaining sand.Find the amount of carbon and calcium (in grams) in 212kg of chalk.Also the amount of sand (in kg).
Chalk - Calcium Carbonate 8 oz | The Beverage People