what kind of change it will be if we mix plaster of paris with water?

Solid

Solid

When Plaster of Paris and water are mixed together they undergo a chemical change. The particles rearrange to make a completely new substance. When plaster of Paris and water are mixed together the mixture becomes warm releasing energy in the form of heat therefore undergoing a chemical change. 
 

It will be a irreversible change.

Chemical , physical and irreversible change

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Bread is an uncountable substance but yes the slices or loaves of bread can be counted.
Hope it is clear @Poonam kohli 

When Plaster of Paris and water are mixed together they undergo a?chemical change. The particles rearrange to make a completely new substance. When plaster of Paris and water are mixed together the mixture becomes warm releasing energy in the form of heat therefore undergoing a chemical change.?
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