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11. A fixed volume and mass of an ideal monatomic gas is heated. During this process, the system changes as a result of adding heat energy. The volume remains fixed throughout. Which of the following statements describe the gas particles that are the substructure of the system (select two answers)? a. Heat is energy. As this energy is added to the system, the gas particles can do work. This is work by the system and removes energy from the system because work done by the particles is negative. b. The internal energy is increased when heat energy is added to the system. Internal energy and temperature are directly proportional. Thus, the temperature of the gas particles is increased. C. When the gas particles receive extra energy, they are able to accelerate and travel greater distances in between collisions. Because of the greater distances between collisions, the number of collisions is reduced and pressure drops proportionally. d. When the temperature of the gas rises, the kinetic energy and velocity of the particles increases. Collisions with the walls of the particles impart a greater impulse; there is a greater force needed to contain the gas. Pressure rises