Multiple ChoiceAn unknown gas expands in a container increasing the volume from 4.3 L to 8.2 L at a constant pressure of 931 mmHg. Calculate the internal energy of the system if the system absorbs 2.3 kJ of energy. 1031views5rank4comments
Multiple ChoiceA gas reaction is allowed to take place in a canister while submerged in water at a temperature of 25oC. The gas expands and does P-V work on the surroundings equal to 385 J. At the same time, the temperature of the water decreases to 20oC as the energy in the gas reaction reaches 364 J. What is the change in energy of the system? 859views2rank2comments
Multiple ChoiceWhich of the following processes must always result in a net increase in internal energy of the system?434views
Open QuestionWhich statement is true of the internal energy of a system and its surroundings during an energy exchange with a negative δusys ?341views
Open QuestionDoes a change in energy always indicate that a chemical reaction has taken place?240views
Open QuestionDuring an energy exchange, a chemical system absorbs energy from its surroundings. What is the sign of ΔEsys for this process?
Open QuestionThe gas in a piston (defined as the system) warms and absorbs 655 J of heat, while performing 344 J of work on the surroundings. What is the change in internal energy for the system?
Open QuestionA 100-W lightbulb is placed in a cylinder equipped with a moveable piston. The lightbulb is turned on for 0.015 hour, and the assembly expands from an initial volume of 0.85 L to a final volume of 5.88 L against an external pressure of 1.0 atm. Use the wattage of the lightbulb and the time it is on to calculate ΔE in joules (assume that the cylinder and lightbulb assembly is the system and assume two significant figures). Calculate w. Calculate q.
Open QuestionDerive a relationship between ΔH and ΔE for a process in which the temperature of a fixed amount of an ideal gas changes.
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