34. A compound which is prepared from gypsum has the properties of hardening when mixed with proper quantity of water. Identify the compound

and write its chemical formula. write the chemical equation for its preparation.

Mention any one use of the compound.

it's filtration, but this is an assumption so my apologies if i got this

i'm pretty sure it is letter c.) car

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.