What is the system and what is the surroundings for a calorimeter that consists

Question

What is the system and what is the surroundings for a calorimeter that consists of a nut being burned under an aluminum can with water that is open?
What converts the molecules in the nuts from potential energy to kinetic energy in relation to temperature, speed, and collisions? What is the system and what is the surroundings for a calorimeter that consists of a nut being burned under an aluminum can with water that is open?
What converts the molecules in the nuts from potential energy to kinetic energy in relation to temperature, speed, and collisions?
What converts the molecules in the nuts from potential energy to kinetic energy in relation to temperature, speed, and collisions?

Explanation / Answer

This is an example of open system in which both energy and matter are transfered to the surroundings from the system.

System is the region under study and except the system remaining everything are considered as surroundings.

Aluminium can with water and nuts is the system.

Remaining everything outside the boundaries of the calorimeter are the surrounings.

As the temperature increases the kinetic energy of the molecules increases

then the speed of the molecules increases then the number of collisions also increases.

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