Calcium Carbonate
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The scientific name for marble chips is calcium carbonate, which is a chemical compound with the formula CaCO3.
When heated, marble chips (calcium carbonate) undergo thermal decomposition to produce calcium oxide (quicklime) and carbon dioxide gas. This process is endothermic, meaning it absorbs heat from the surroundings. The marble chips will decrease in mass as they release carbon dioxide.
Marble chips are often used in filtration systems to help remove impurities from water. They act as a physical filter, providing a substrate for beneficial bacteria to colonize, which aids in the biological breakdown of contaminants. Additionally, marble chips can help stabilize pH levels, as they slowly dissolve in water, releasing calcium carbonate, which can neutralize acidity. This dual action enhances the overall effectiveness of the filtration process.
you don't you can heat them indirectly also, it will just take longer.
Marble chips are added during heating to provide a surface area for reactions to occur. This helps in increasing the rate of reaction by providing more exposed surface area for the reactants to interact, ultimately leading to faster reaction times.
In the laboratory, carbon dioxide is usually prepared by the action of dilute hydrochloric acid on marble chips.