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what is the system and surroundings of the following reactions: 1) Calcium chloride is mixed with water, resulting in a very hot solution. 2) Ammonium

what is the system and surroundings of the following reactions:

1) Calcium chloride is mixed with water, resulting in a very hot solution.

2) Ammonium nitrate is mixed in water, resulting in a very cold solution

3) Sparks from a sparkler that strike your skin

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