The internal energy of an ideal gas is just function of the temperature; it does not matter what other thermodynamic property changes, if the temperature does not change, the internal energy neither does. That is just for ideal gases; real gases behaviour is not like that. All of the other options bring with them an increase or decrease of the temperature:

For A, the temperature will decrease because the gas will do work as it expands, converting part of his internal energy to work.

For C, the temperature will increase, because given $PV=nRT$ , if the volume increases (expansion) and the pressure is constant, the temperature must increase to satisfy the equation.

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4 years ago

Samuel adds a teaspoon of salt to a glass of water. He notices that the salt disappears . samuel takes a sip to discover that th

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It is a Physical Change, because the water and the salt kept their original properties. I hope this helps! :) Have a great day!

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3 years ago

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