Question

Does the number of particles change as the substance changes its state?​

Answer 1

No. The number of particles in the substance remains the same when the state of matter changes.

Step-by-step explanation:

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Answer 2

Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. ... When substances change state there is no change in mass so if 100 g of ice is melted 100g of water are formed this will boil to form 100g of steam (this is called "conservation of mass").