is hardening of cement by absorption of carbon (iv)oxide a physical or chemical change
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Answer:When the powdered cement particles were exposed to carbon dioxide, it increased the rate of hydration. Hydration was a chemical reaction wherein all the cement molecules react with the water molecules to form their hydration products.
After the hydration process, the cement particles also underwent a physical process, called hardening, wherein the product formed a stiff layer that was able to bear higher loads.
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