Question

Is the hardening of cement by the absorbtion of carbon (IV) oxide a physical or a chemical change

Answer 1

Answer:

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.

Answer 2

Answer:

chemical change

Explanation:

chemical change