Question

The hardening of
The hardening of cement by absorption of carbon(IV) oxide is an example of which change

Answer 1

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.