Answer:
No
Explanation:
In the hot pack, as the water reacts with the magnesium sulfate, the pack becomes bigger is not an indication that new atoms have been created or produced.
As with all chemical reactions, they all obey the law of conservation of matter which states that "in chemical reactions, matter is neither created nor destroyed but atoms simply recombine".
The reason why the hotpack becomes bigger is because the atoms gain more volume.
