Question

During a process 20kJ of heat energy was transferred into a closed system. During the process it is observed that • the temperature within the system remains constant • no phase change occurs within the system • no other energy transfers occur across the system boundary What could have happened to the 20 kJ of energy? Select all possible correct answers (Note: incorrect answers will deduct from your score for this question) a. There was an increase of work inside the system amounting to 20 kJ b. The velocity of the entire system increased (i.e. its kinetic energy increased) c. A chemical reaction occurred inside the system that increased the internal energy of the system by 20 kj d. The elevation of the entire system increased (i.e. its potential energy increased) e. The pressure inside the system increased by 20 kj

Answer 1

When 20 kJ of heat energy is transferred into a closed system and the temperature remains constant, the energy could have been used to increase the work done inside the system by 20 kJ or to cause a chemical reaction that increased the internal energy of the system by 20 kJ.

Step-by-step explanation:

When 20 kJ of heat energy is transferred into a closed system, and the temperature remains constant, no phase change occurs, and no other energy transfers occur across the system boundary, the energy can only be in the form of work done by the system or a chemical reaction that increases the internal energy of the system.

Therefore, options a and c are correct. The increase in work inside the system would be 20 kJ and a chemical reaction could also increase the internal energy by 20 kJ. The other options (b, d, e) are incorrect because they do not involve the transfer of energy in the form of work or a chemical reaction.

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